{"database": "metadata", "table": "run_metadata", "is_view": false, "human_description_en": "where experiment.library_selection = \"cDNA\", experiment.library_source = \"TRANSCRIPTOMIC SINGLE CELL\" and tissue_curation = \"Spinal Cord\"", "rows": [[24967, "SRR25557924", "SRX21286763", "SRS18536876", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 AllGFP S5", "GSM7688796", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 AllGFP S5", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688796", "GSM7688796: MUTSU2 AllGFP S5; Danio rerio; RNA Seq", "GSM7688796 r1", "GSM7688796", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_AllGFP-S5_S3_L001_I1_001.fastq.gz MUTSU2_AllGFP-S5_S3_L001_R1_001.fastq.gz MUTSU2_AllGFP-S5_S3_L001_R2_001.fastq.gz", "fastq fastq fastq", 783833459.0, 6171917.0, "GSM7688796 r1", "0:8 1:28 2:91", "A:165863131;C:117191802;G:128146802;T:150173329;N:269383", 8, 28, 91, null, 165863131, 117191802, 128146802, 150173329, 269383, "SRX21286763", "SRS18536876", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.89127, null, 0.221, null, 0.78317, null, 0.52195, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24968, "SRR25557925", "SRX21286763", "SRS18536876", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 AllGFP S5", "GSM7688796", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 AllGFP S5", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688796", "GSM7688796: MUTSU2 AllGFP S5; Danio rerio; RNA Seq", "GSM7688796 r1", "GSM7688796", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_AllGFP-S5-3_S2_L002_I1_001.fastq.gz MUTSU2_AllGFP-S5-3_S2_L002_R1_001.fastq.gz MUTSU2_AllGFP-S5-3_S2_L002_R2_001.fastq.gz", "fastq fastq fastq", 7208342327.0, 56758601.0, "GSM7688796 r10", "0:8 1:28 2:91", "A:1518008610;C:1083228714;G:1190089577;T:1369772782;N:3933008", 8, 28, 91, null, 1518008610, 1083228714, 1190089577, 1369772782, 3933008, "SRX21286763", "SRS18536876", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.88938, null, 0.21991, null, 0.79088, null, 0.53044, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24969, "SRR25557926", "SRX21286763", "SRS18536876", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 AllGFP S5", "GSM7688796", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 AllGFP S5", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688796", "GSM7688796: MUTSU2 AllGFP S5; Danio rerio; RNA Seq", "GSM7688796 r1", "GSM7688796", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_AllGFP-S5-3_S2_L003_I1_001.fastq.gz MUTSU2_AllGFP-S5-3_S2_L003_R1_001.fastq.gz MUTSU2_AllGFP-S5-3_S2_L003_R2_001.fastq.gz", "fastq fastq fastq", 7337435414.0, 57775082.0, "GSM7688796 r11", "0:8 1:28 2:91", "A:1545051667;C:1103394058;G:1211577972;T:1395133564;N:2375201", 8, 28, 91, null, 1545051667, 1103394058, 1211577972, 1395133564, 2375201, "SRX21286763", "SRS18536876", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.88966, null, 0.2211, null, 0.78961, null, 0.53156, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24970, "SRR25557927", "SRX21286763", "SRS18536876", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 AllGFP S5", "GSM7688796", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 AllGFP S5", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688796", "GSM7688796: MUTSU2 AllGFP S5; Danio rerio; RNA Seq", "GSM7688796 r1", "GSM7688796", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_AllGFP-S5-3_S2_L004_I1_001.fastq.gz MUTSU2_AllGFP-S5-3_S2_L004_R1_001.fastq.gz MUTSU2_AllGFP-S5-3_S2_L004_R2_001.fastq.gz", "fastq fastq fastq", 7218240453.0, 56836539.0, "GSM7688796 r12", "0:8 1:28 2:91", "A:1521442237;C:1084242714;G:1191469584;T:1372277539;N:2692975", 8, 28, 91, null, 1521442237, 1084242714, 1191469584, 1372277539, 2692975, "SRX21286763", "SRS18536876", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.8888, null, 0.2174, null, 0.79172, null, 0.53311, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24971, "SRR25557928", "SRX21286763", "SRS18536876", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 AllGFP S5", "GSM7688796", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 AllGFP S5", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688796", "GSM7688796: MUTSU2 AllGFP S5; Danio rerio; RNA Seq", "GSM7688796 r1", "GSM7688796", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_AllGFP-S5_S3_L002_I1_001.fastq.gz MUTSU2_AllGFP-S5_S3_L002_R1_001.fastq.gz MUTSU2_AllGFP-S5_S3_L002_R2_001.fastq.gz", "fastq fastq fastq", 774302109.0, 6096867.0, "GSM7688796 r2", "0:8 1:28 2:91", "A:163989105;C:115793536;G:126358958;T:148430473;N:242825", 8, 28, 91, null, 163989105, 115793536, 126358958, 148430473, 242825, "SRX21286763", "SRS18536876", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.89371, null, 0.2215, null, 0.78253, null, 0.53282, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24972, "SRR25557929", "SRX21286763", "SRS18536876", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 AllGFP S5", "GSM7688796", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 AllGFP S5", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688796", "GSM7688796: MUTSU2 AllGFP S5; Danio rerio; RNA Seq", "GSM7688796 r1", "GSM7688796", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_AllGFP-S5_S3_L003_I1_001.fastq.gz MUTSU2_AllGFP-S5_S3_L003_R1_001.fastq.gz MUTSU2_AllGFP-S5_S3_L003_R2_001.fastq.gz", "fastq fastq fastq", 790430093.0, 6223859.0, "GSM7688796 r3", "0:8 1:28 2:91", "A:167465790;C:118269595;G:129024496;T:151447225;N:164063", 8, 28, 91, null, 167465790, 118269595, 129024496, 151447225, 164063, "SRX21286763", "SRS18536876", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.89284, null, 0.21955, null, 0.78356, null, 0.53369, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24973, "SRR25557930", "SRX21286763", "SRS18536876", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 AllGFP S5", "GSM7688796", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 AllGFP S5", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688796", "GSM7688796: MUTSU2 AllGFP S5; Danio rerio; RNA Seq", "GSM7688796 r1", "GSM7688796", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_AllGFP-S5_S3_L004_I1_001.fastq.gz MUTSU2_AllGFP-S5_S3_L004_R1_001.fastq.gz MUTSU2_AllGFP-S5_S3_L004_R2_001.fastq.gz", "fastq fastq fastq", 778936974.0, 6133362.0, "GSM7688796 r4", "0:8 1:28 2:91", "A:165013558;C:116498474;G:127146290;T:149314806;N:162814", 8, 28, 91, null, 165013558, 116498474, 127146290, 149314806, 162814, "SRX21286763", "SRS18536876", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.89195, null, 0.2209, null, 0.78196, null, 0.53121, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24974, "SRR25557931", "SRX21286763", "SRS18536876", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 AllGFP S5", "GSM7688796", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 AllGFP S5", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688796", "GSM7688796: MUTSU2 AllGFP S5; Danio rerio; RNA Seq", "GSM7688796 r1", "GSM7688796", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_AllGFP-S5-2_S2_L001_I1_001.fastq.gz MUTSU2_AllGFP-S5-2_S2_L001_R1_001.fastq.gz MUTSU2_AllGFP-S5-2_S2_L001_R2_001.fastq.gz", "fastq fastq fastq", 4174244890.0, 32868070.0, "GSM7688796 r5", "0:8 1:28 2:91", "A:882060228;C:627098568;G:684890393;T:795503862;N:1441319", 8, 28, 91, null, 882060228, 627098568, 684890393, 795503862, 1441319, "SRX21286763", "SRS18536876", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.89137, null, 0.22041, null, 0.77926, null, 0.52991, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24975, "SRR25557932", "SRX21286763", "SRS18536876", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 AllGFP S5", "GSM7688796", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 AllGFP S5", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688796", "GSM7688796: MUTSU2 AllGFP S5; Danio rerio; RNA Seq", "GSM7688796 r1", "GSM7688796", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_AllGFP-S5-2_S2_L002_I1_001.fastq.gz MUTSU2_AllGFP-S5-2_S2_L002_R1_001.fastq.gz MUTSU2_AllGFP-S5-2_S2_L002_R2_001.fastq.gz", "fastq fastq fastq", 4150210902.0, 32678826.0, "GSM7688796 r6", "0:8 1:28 2:91", "A:878218072;C:623662333;G:679977758;T:790589138;N:1325865", 8, 28, 91, null, 878218072, 623662333, 679977758, 790589138, 1325865, "SRX21286763", "SRS18536876", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.89264, null, 0.22159, null, 0.78121, null, 0.52989, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24976, "SRR25557933", "SRX21286763", "SRS18536876", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 AllGFP S5", "GSM7688796", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 AllGFP S5", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688796", "GSM7688796: MUTSU2 AllGFP S5; Danio rerio; RNA Seq", "GSM7688796 r1", "GSM7688796", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_AllGFP-S5-2_S2_L003_I1_001.fastq.gz MUTSU2_AllGFP-S5-2_S2_L003_R1_001.fastq.gz MUTSU2_AllGFP-S5-2_S2_L003_R2_001.fastq.gz", "fastq fastq fastq", 4198043547.0, 33055461.0, "GSM7688796 r7", "0:8 1:28 2:91", "A:888287475;C:630914324;G:688006958;T:799794077;N:1044117", 8, 28, 91, null, 888287475, 630914324, 688006958, 799794077, 1044117, "SRX21286763", "SRS18536876", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.8912, null, 0.21889, null, 0.7822, null, 0.52774, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24977, "SRR25557934", "SRX21286763", "SRS18536876", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 AllGFP S5", "GSM7688796", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 AllGFP S5", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688796", "GSM7688796: MUTSU2 AllGFP S5; Danio rerio; RNA Seq", "GSM7688796 r1", "GSM7688796", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_AllGFP-S5-2_S2_L004_I1_001.fastq.gz MUTSU2_AllGFP-S5-2_S2_L004_R1_001.fastq.gz MUTSU2_AllGFP-S5-2_S2_L004_R2_001.fastq.gz", "fastq fastq fastq", 4154784553.0, 32714839.0, "GSM7688796 r8", "0:8 1:28 2:91", "A:880520885;C:624179045;G:680076172;T:791297938;N:976309", 8, 28, 91, null, 880520885, 624179045, 680076172, 791297938, 976309, "SRX21286763", "SRS18536876", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.8927, null, 0.22063, null, 0.78216, null, 0.5346, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24978, "SRR25557935", "SRX21286763", "SRS18536876", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 AllGFP S5", "GSM7688796", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 AllGFP S5", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688796", "GSM7688796: MUTSU2 AllGFP S5; Danio rerio; RNA Seq", "GSM7688796 r1", "GSM7688796", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_AllGFP-S5-3_S2_L001_I1_001.fastq.gz MUTSU2_AllGFP-S5-3_S2_L001_R1_001.fastq.gz MUTSU2_AllGFP-S5-3_S2_L001_R2_001.fastq.gz", "fastq fastq fastq", 7231973725.0, 56944675.0, "GSM7688796 r9", "0:8 1:28 2:91", "A:1522035629;C:1085783001;G:1195535350;T:1374885853;N:3725592", 8, 28, 91, null, 1522035629, 1085783001, 1195535350, 1374885853, 3725592, "SRX21286763", "SRS18536876", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.88833, null, 0.22076, null, 0.79056, null, 0.52744, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24979, "SRR25557936", "SRX21286762", "SRS18536875", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 OtherGFP G8", "GSM7688795", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 OtherGFP G8", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688795", "GSM7688795: MUTSU2 OtherGFP G8; Danio rerio; RNA Seq", "GSM7688795 r1", "GSM7688795", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_OtherGFP-G8_S2_L001_I1_001.fastq.gz MUTSU2_OtherGFP-G8_S2_L001_R1_001.fastq.gz MUTSU2_OtherGFP-G8_S2_L001_R2_001.fastq.gz", "fastq fastq fastq", 699161670.0, 5505210.0, "GSM7688795 r1", "0:8 1:28 2:91", "A:149927051;C:100829317;G:116075103;T:133908276;N:234363", 8, 28, 91, null, 149927051, 100829317, 116075103, 133908276, 234363, "SRX21286762", "SRS18536875", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.85081, null, 0.21257, null, 0.80426, null, 0.52779, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24980, "SRR25557937", "SRX21286762", "SRS18536875", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 OtherGFP G8", "GSM7688795", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 OtherGFP G8", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688795", "GSM7688795: MUTSU2 OtherGFP G8; Danio rerio; RNA Seq", "GSM7688795 r1", "GSM7688795", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_OtherGFP-G8-3_S1_L002_I1_001.fastq.gz MUTSU2_OtherGFP-G8-3_S1_L002_R1_001.fastq.gz MUTSU2_OtherGFP-G8-3_S1_L002_R2_001.fastq.gz", "fastq fastq fastq", 8174836330.0, 64368790.0, "GSM7688795 r10", "0:8 1:28 2:91", "A:1748532358;C:1187854561;G:1356279755;T:1560491610;N:4401606", 8, 28, 91, null, 1748532358, 1187854561, 1356279755, 1560491610, 4401606, "SRX21286762", "SRS18536875", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.85069, null, 0.20989, null, 0.81049, null, 0.52069, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24981, "SRR25557938", "SRX21286762", "SRS18536875", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 OtherGFP G8", "GSM7688795", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 OtherGFP G8", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688795", "GSM7688795: MUTSU2 OtherGFP G8; Danio rerio; RNA Seq", "GSM7688795 r1", "GSM7688795", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_OtherGFP-G8-3_S1_L003_I1_001.fastq.gz MUTSU2_OtherGFP-G8-3_S1_L003_R1_001.fastq.gz MUTSU2_OtherGFP-G8-3_S1_L003_R2_001.fastq.gz", "fastq fastq fastq", 8307872640.0, 65416320.0, "GSM7688795 r11", "0:8 1:28 2:91", "A:1778112295;C:1207569588;G:1377139686;T:1587359299;N:2704252", 8, 28, 91, null, 1778112295, 1207569588, 1377139686, 1587359299, 2704252, "SRX21286762", "SRS18536875", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.85151, null, 0.21054, null, 0.80813, null, 0.52675, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24982, "SRR25557939", "SRX21286762", "SRS18536875", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 OtherGFP G8", "GSM7688795", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 OtherGFP G8", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688795", "GSM7688795: MUTSU2 OtherGFP G8; Danio rerio; RNA Seq", "GSM7688795 r1", "GSM7688795", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_OtherGFP-G8-3_S1_L004_R2_001.fastq.gz MUTSU2_OtherGFP-G8-3_S1_L004_R1_001.fastq.gz MUTSU2_OtherGFP-G8-3_S1_L004_I1_001.fastq.gz", "fastq fastq fastq", 8197523483.0, 64547429.0, "GSM7688795 r12", "0:8 1:28 2:91", "A:1755321680;C:1190415496;G:1359502433;T:1565500310;N:3076120", 8, 28, 91, null, 1755321680, 1190415496, 1359502433, 1565500310, 3076120, "SRX21286762", "SRS18536875", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.84956, null, 0.20968, null, 0.81113, null, 0.52382, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24983, "SRR25557940", "SRX21286762", "SRS18536875", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 OtherGFP G8", "GSM7688795", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 OtherGFP G8", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688795", "GSM7688795: MUTSU2 OtherGFP G8; Danio rerio; RNA Seq", "GSM7688795 r1", "GSM7688795", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_OtherGFP-G8_S2_L002_R2_001.fastq.gz MUTSU2_OtherGFP-G8_S2_L002_R1_001.fastq.gz MUTSU2_OtherGFP-G8_S2_L002_I1_001.fastq.gz", "fastq fastq fastq", 690198899.0, 5434637.0, "GSM7688795 r2", "0:8 1:28 2:91", "A:147896108;C:99606794;G:114681063;T:132140792;N:227210", 8, 28, 91, null, 147896108, 99606794, 114681063, 132140792, 227210, "SRX21286762", "SRS18536875", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.85228, null, 0.21261, null, 0.803, null, 0.52382, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24984, "SRR25557941", "SRX21286762", "SRS18536875", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 OtherGFP G8", "GSM7688795", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 OtherGFP G8", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688795", "GSM7688795: MUTSU2 OtherGFP G8; Danio rerio; RNA Seq", "GSM7688795 r1", "GSM7688795", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_OtherGFP-G8_S2_L003_I1_001.fastq.gz MUTSU2_OtherGFP-G8_S2_L003_R1_001.fastq.gz MUTSU2_OtherGFP-G8_S2_L003_R2_001.fastq.gz", "fastq fastq fastq", 702239515.0, 5529445.0, "GSM7688795 r3", "0:8 1:28 2:91", "A:150477574;C:101266550;G:116878466;T:134415299;N:141606", 8, 28, 91, null, 150477574, 101266550, 116878466, 134415299, 141606, "SRX21286762", "SRS18536875", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.85364, null, 0.21344, null, 0.80346, null, 0.52158, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24985, "SRR25557942", "SRX21286762", "SRS18536875", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 OtherGFP G8", "GSM7688795", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 OtherGFP G8", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688795", "GSM7688795: MUTSU2 OtherGFP G8; Danio rerio; RNA Seq", "GSM7688795 r1", "GSM7688795", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_OtherGFP-G8_S2_L004_I1_001.fastq.gz MUTSU2_OtherGFP-G8_S2_L004_R1_001.fastq.gz MUTSU2_OtherGFP-G8_S2_L004_R2_001.fastq.gz", "fastq fastq fastq", 694537346.0, 5468798.0, "GSM7688795 r4", "0:8 1:28 2:91", "A:148876263;C:100202441;G:115455212;T:132982029;N:144673", 8, 28, 91, null, 148876263, 100202441, 115455212, 132982029, 144673, "SRX21286762", "SRS18536875", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.85238, null, 0.2138, null, 0.80379, null, 0.52691, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24986, "SRR25557943", "SRX21286762", "SRS18536875", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 OtherGFP G8", "GSM7688795", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 OtherGFP G8", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688795", "GSM7688795: MUTSU2 OtherGFP G8; Danio rerio; RNA Seq", "GSM7688795 r1", "GSM7688795", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_OtherGFP-G8-2_S1_L001_R2_001.fastq.gz MUTSU2_OtherGFP-G8-2_S1_L001_R1_001.fastq.gz MUTSU2_OtherGFP-G8-2_S1_L001_I1_001.fastq.gz", "fastq fastq fastq", 4324997954.0, 34055102.0, "GSM7688795 r5", "0:8 1:28 2:91", "A:924471384;C:626141120;G:722856562;T:824050239;N:1494977", 8, 28, 91, null, 924471384, 626141120, 722856562, 824050239, 1494977, "SRX21286762", "SRS18536875", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.85083, null, 0.21122, null, 0.80472, null, 0.524, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24987, "SRR25557944", "SRX21286762", "SRS18536875", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 OtherGFP G8", "GSM7688795", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 OtherGFP G8", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688795", "GSM7688795: MUTSU2 OtherGFP G8; Danio rerio; RNA Seq", "GSM7688795 r1", "GSM7688795", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_OtherGFP-G8-2_S1_L002_R2_001.fastq.gz MUTSU2_OtherGFP-G8-2_S1_L002_R1_001.fastq.gz MUTSU2_OtherGFP-G8-2_S1_L002_I1_001.fastq.gz", "fastq fastq fastq", 4306232942.0, 33907346.0, "GSM7688795 r6", "0:8 1:28 2:91", "A:920615353;C:623090513;G:721201055;T:819291149;N:1370416", 8, 28, 91, null, 920615353, 623090513, 721201055, 819291149, 1370416, "SRX21286762", "SRS18536875", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.85335, null, 0.21315, null, 0.80206, null, 0.51508, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24988, "SRR25557945", "SRX21286762", "SRS18536875", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 OtherGFP G8", "GSM7688795", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 OtherGFP G8", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688795", "GSM7688795: MUTSU2 OtherGFP G8; Danio rerio; RNA Seq", "GSM7688795 r1", "GSM7688795", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_OtherGFP-G8-2_S1_L003_R2_001.fastq.gz MUTSU2_OtherGFP-G8-2_S1_L003_R1_001.fastq.gz MUTSU2_OtherGFP-G8-2_S1_L003_I1_001.fastq.gz", "fastq fastq fastq", 4348436312.0, 34239656.0, "GSM7688795 r7", "0:8 1:28 2:91", "A:930204208;C:629005094;G:727756813;T:827747478;N:1095103", 8, 28, 91, null, 930204208, 629005094, 727756813, 827747478, 1095103, "SRX21286762", "SRS18536875", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.85369, null, 0.21216, null, 0.80503, null, 0.52219, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24989, "SRR25557946", "SRX21286762", "SRS18536875", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 OtherGFP G8", "GSM7688795", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 OtherGFP G8", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688795", "GSM7688795: MUTSU2 OtherGFP G8; Danio rerio; RNA Seq", "GSM7688795 r1", "GSM7688795", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_OtherGFP-G8-2_S1_L004_R2_001.fastq.gz MUTSU2_OtherGFP-G8-2_S1_L004_R1_001.fastq.gz MUTSU2_OtherGFP-G8-2_S1_L004_I1_001.fastq.gz", "fastq fastq fastq", 4313915172.0, 33967836.0, "GSM7688795 r8", "0:8 1:28 2:91", "A:922742754;C:623127831;G:724345885;T:819819593;N:1037013", 8, 28, 91, null, 922742754, 623127831, 724345885, 819819593, 1037013, "SRX21286762", "SRS18536875", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.85456, null, 0.21236, null, 0.80223, null, 0.5216, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [24990, "SRR25557947", "SRX21286762", "SRS18536875", "SRP453891", "PRJNA1003032", "Molecular Analyses of V0v Spinal Interneurons and Identification of Transcriptional Regulators Downstream of Evx1 and Evx2 in These Cells. [scRNA Seq]", "GSE240239", "Transcriptome Analysis", "Background: V0v spinal interneurons are highly conserved  glutamatergic  commissural neurons that function in locomotor circuits. We have previously shown that Evx1 and Evx2 are required to specify the neurotransmitter phenotype of these cells. However  we still know very little about the gene regulatory networks that act downstream of these transcription factors in V0v cells. Methods: To identify candidate members of V0v gene regulatory networks  we FAC sorted WT and evx1;evx2 double mutant zebrafish V0v spinal interneurons and expression profiled them using microarrays and scRNA seq. We also used in situ hybridization to compare expression of a subset of candidate genes in evx1;evx2 mutants and wild type siblings.  Results: Our data reveal two molecularly distinct subtypes of V0v spinal interneurons at 48 h and suggest that  by this stage of development  evx1;evx2 double mutant cells transfate into either inhibitory spinal interneurons  or motoneurons. Our results also identify 25 transcriptional regulator genes that require Evx1/2 for their expression in V0v interneurons  plus a further 11 transcriptional regulator genes that are repressed in V0v interneurons by Evx1/2. Two of the latter genes are hmx2 and hmx3a. Intriguingly  we show that Hmx2/3a  repress dI2 interneuronal expression of skor1a and nefma  two genes that require Evx1/2 for their expression in V0v interneurons. This suggests that Evx1/2 might regulate skor1a and nefma expression in V0v interneurons by repressing Hmx2/3a expression. Conclusions: This study identifies two molecularly distinct subsets of V0v spinal interneurons  as well as multiple transcriptional regulators that are strong candidates for acting downstream of Evx1/2 to specify the essential functional characteristics of V0v interneurons. Our data further suggest that in the absence of both Evx1 and Evx2  V0v spinal interneurons initially change their neurotransmitter phenotypes from excitatory to inhibitory and then  later  start to express markers of distinct types of inhibitory spinal interneurons  or motoneurons. Taken together  our findings significantly increase our knowledge of V0v spinal development and move us closer towards the essential goal of identifying the complete gene regulatory networks that specify this crucial cell type. Overall design: Two samples were analysed in total  both at 48 hpf. These two samples represent two biological replicates of all V0v spinal interneurons isolated from embryos from an incross of heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents.", "parent bioproject:PRJNA1003022", "pubmed:38017520", null, "MUTSU2 OtherGFP G8", "GSM7688795", null, "source name:Spinal Cord|tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1|geo loc name:missing|collection date:missing", "MUTSU2 OtherGFP G8", "We performed demultiplexing and counts analysis as per the manufacturer\u2019s instructions using Cell Ranger v4.0.0 software https://www.10xgenomics.com We analyzed the data using Partek Flow Genomic Analysis Software https://www.partek.com/partek flow/. Multiplets were removed by filtering out cells with >12 000 counts and >2 500 detected genes. Sick and/or \u201cleaky\u201d cells were removed by filtering out cells with <500 detected genes and >6% mitochondrial transcripts. We normalized the data using a counts per million CPM algorithm and applied a logarithmic transformation to improve data visualization. The outcome of normalisation was assessed by principal components analysis PCA  graph based clustering and Uniform Manifold Approximation and Projection UMAP plotting  using the NN Descent method of nearest neighbour type calculation and Euclidean distance metrics. We manually inspected UMAP plots to assess clustering quality based on expression of known V0v spinal interneuron markers. We then fine tuned the clustering by manually deducing and extrapolating cell fate assignments by comparing expression profiles of 48 hpf single cell clusters with the molecular phenotypes of V0v spinal interneurons in 24 hpf and 30 hpf wild type  evx1i232 and evx2sa140 single mutant and evx1i232;evx2sa140 double mutant embryos. To perform differential expression analysis in Partek Flow  we used the statistically robust Hurdle Model two part model with default parameters. We initially analyzed the two libraries separately. We then combined the data from these two libraries using the Counts Aggregation pipeline in Cell Ranger v4.0.0 and reanalyzed the data as described above. Assembly: Lawson Lab zebrafish transcriptome V4.3.2 https://www.umassmed.edu/lawson lab/reagents/zebrafish transcriptome/ Supplementary files format and content: Tab separated and matrix files.", "Spinal Cord", null, "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz\u2019s L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco\u2019s Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco\u2019s Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell 3\u2019 GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", "Embryos obtained from crossing heterozygous evx1i232/+;evx2sa140/+;Tgevx1:EGFPSU2 parents were raised at 28.5oC until they reached the desired developmental stage of 48 hpf  as confirmed by analysis of morphological criteria  including head trunk angle  head and eye size.", "tissue:Spinal Cord|cell line:Tgevx1:EGFPSU2|cell type:V0v spinal interneurons|genotype:evx1i232/+;evx2sa140/+ incross|treatment:N1", "GSM7688795", "GSM7688795: MUTSU2 OtherGFP G8; Danio rerio; RNA Seq", "GSM7688795 r1", "GSM7688795", "1", "Embryos were screened for fluorescence from 30 hpf onwards using a fluorescent dissecting microscope. Only EGFP positive embryos were used for dissections and FACS at 48 hpf.  Embryos were deyolked  dissected and dissociated as described in GSE145916  with the following modifications: Trunk tissue was dissected anteriorly at the boundary between the hindbrain and spinal cord  and posteriorly  immediately above the end of the yolk extension. To ensure complete dissociation of trunk tissue with the Papain Dissociation System Worthington Biochemical Corporation  LK003150  trunks were incubated in 1 ml Papain/DNase mix with gentle rocking at 28.5oC for 40 minutes. The digested tissue was then allowed to settle for 10 seconds before the Papain/DNase mix was carefully decanted until approximately 500 \u00b5l remained. Immediately post homogenising the digested tissue mixture with a sterile p200 tip  we passed each sample through a 40 \u00b5m Flowmi cell strainer Merck  BAH136800040 into a sterile microcentrifuge tube. post Papain inactivation  samples were resuspended in 1 ml Leibovitz's L 15 medium ThermoFisher Scientific  21083027 + 0.5% FBS and stored on ice. Immediately before FACS  DAPI Merck  D9542 and Draq5 BioLegend  424101 were added at a final concentration of 5 \u00b5g/ml and 5 \u00b5M respectively.  FACS was performed using a Becton Dickinson FACS Aria III Cell Sorter at the SUNY Upstate Medical University Research Flow Core using the parameters described by Cerda et al.  2008 with the following modifications. Ice cold samples were filtered through 35 \u00b5m mesh strainers in to 5 ml round bottomed polystyrene tubes Corning Falcon  352235. All FAC sorting and collection steps were performed at +4oC  using a 100 \u00b5m nozzle and 20 psi sort pressure. Successive doublet exclusion gates forward scatter height x forward scatter width  followed by side scatter height x side scatter width were used to finesse capture of real single cells. Accurate live/dead filtering was performed by selecting for DAPI negative sick cells are DAPI permeant and excluded and Draq 5 positive only healthy nuclei are Draq 5 permeant cells.  EGFP positive cells were sorted and fixed using a methanol fixation protocol modified from the 10x Genomics Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com. EGFP positive cells were sorted directly in to 5 ml round bottomed tubes containing 3.5 mls of freshly made  pre chilled  90% methanol for HPLC  >99%  Merck  34860/10% Dulbecco's Phosphate Buffered Saline DPBS  No calcium  No magnesium  Merck  D8537 fixative. A tube of EGFP negative cells was also collected to assess fixation efficiency. Sorted cells were incubated on ice for 1 hour before assessing fixation efficiency of the EGFP negative control tube using Trypan Blue ThermoFisher Scientific  15250061 and a hemocytometer. Samples with intact  fully fixed cells  containing little or no cell debris were stored at +4oC for up to six days prior to rehydrating and performing single cell capture with the 10x Genomics Chromium system please see below.  To rehydrate our fixed EGFP positive 48 hpf evx1i232;evx2sa140;Tgevx1:EGFPSU2 cells  we first centrifuged each sample at 300 rcf for 10 minutes at +4oC using a swing bucket centrifuge. Next  we carefully removed the majority of the supernatant with a sterile p1000 tip  until approximately 100 \u00b5l remained in the tube. Samples were kept on ice at all times. Each cell pellet was then gently resuspended by adding 2 ml of freshly made  pre chilled Rehydration Buffer 1x Dulbecco's Phosphate Buffered Saline  no calcium  no magnesium Merck  D8537  1.0% UltraPure BSA ThermoFisher Scientific  AM2616  0.5 u/\u00b5l Roche Protector RNase Inhibitor Merck  3335402001 and gently pipetting 10 times. It is important to avoid making foam. We repeated the centrifugation and resuspension in Rehydration Buffer steps as previously. post the second Rehydration step  we again centrifuged at 300 rcf for 10 minutes at +4oC before carefully removing all but 30 40 \u00b5l of supernatant. Using a sterile p200 tip  we carefully resuspended the cell pellet and immediately measured the cell concentration in triplicate using a Bio Rad TC20 automated cell counter Bio Rad  1450102. We also checked a small aliquot under a conventional microscope to ensure we had single cell suspensions. As described by 10x Genomics in their Sample Preparation Demonstrated Protocol \u201cMethanol Fixation of Cells for Single Cell RNA Sequencing\u201d https://www.10xgenomics.com  we too recovered approximately 50% of the sorted cells post rehydration. We isolated single cells using a 10x Genomics Chromium system  aiming for capture of 10 000 cells per well Chromium Next GEM Chip G Single Cell Kit  1000127. We prepared libraries using a 10x Genomics Chromium Next GEM Single Cell three prime GEM  Library and Gel Bead Kit v3.1  10x Genomics  1000128 and sequenced them on an Illumina NextSeq500 to a depth of at least 50 000 reads per cell Illumina NextSeq 500/500 High Output Kit  v2.5  150 cycles  20024907.", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "PAIRED", "ILLUMINA", "NextSeq 500", null, "SRP453891", null, "loader:fastq load.py", "MUTSU2_OtherGFP-G8-3_S1_L001_R2_001.fastq.gz MUTSU2_OtherGFP-G8-3_S1_L001_R1_001.fastq.gz MUTSU2_OtherGFP-G8-3_S1_L001_I1_001.fastq.gz", "fastq fastq fastq", 8184961024.0, 64448512.0, "GSM7688795 r9", "0:8 1:28 2:91", "A:1748819280;C:1187802244;G:1360994184;T:1562975470;N:4223414", 8, 28, 91, null, 1748819280, 1187802244, 1360994184, 1562975470, 4223414, "SRX21286762", "SRS18536875", "SRA1688438", "Lewis Lab, Biology, Syracuse University", "Lewis Lab, Biology, Syracuse University", 1, 0.8493, null, 0.21072, null, 0.80967, null, 0.52593, null, 91, null, "B", null, "usable mapping rate", "illumina", "nextseq", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2023-08-07", "Multi-stage", "Embryo", "Spinal Cord", "Nervous System"], [26558, "SRR26173859", "SRX21885960", "SRS18977085", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 F17 R1", "GSM7804200", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 F17 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804200", "GSM7804200: V2a sample2 354 F17 R1; Danio rerio; RNA Seq", "GSM7804200 r1", "GSM7804200", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_F17_R1.fastq.gz", "fastq", 26979490.0, 627430.0, "GSM7804200 r1", "0:43", "A:7493119;C:5872644;G:6013311;T:7600416;N:0", 43, null, null, null, 7493119, 5872644, 6013311, 7600416, 0, "SRX21885960", "SRS18977085", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.82979, null, 0.33034, null, 0.94253, null, 0.53995, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26559, "SRR26173860", "SRX21885959", "SRS18977083", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 F16 R1", "GSM7804199", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 F16 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804199", "GSM7804199: V2a sample2 354 F16 R1; Danio rerio; RNA Seq", "GSM7804199 r1", "GSM7804199", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_F16_R1.fastq.gz", "fastq", 26312130.0, 611910.0, "GSM7804199 r1", "0:43", "A:7117249;C:5957278;G:6103577;T:7134026;N:0", 43, null, null, null, 7117249, 5957278, 6103577, 7134026, 0, "SRX21885959", "SRS18977083", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.87071, null, 0.23579, null, 0.90678, null, 0.52226, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26560, "SRR26173861", "SRX21885958", "SRS18977084", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 F15 R1", "GSM7804198", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 F15 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804198", "GSM7804198: V2a sample2 354 F15 R1; Danio rerio; RNA Seq", "GSM7804198 r1", "GSM7804198", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_F15_R1.fastq.gz", "fastq", 32073872.0, 745904.0, "GSM7804198 r1", "0:43", "A:8695962;C:7255833;G:7422516;T:8699561;N:0", 43, null, null, null, 8695962, 7255833, 7422516, 8699561, 0, "SRX21885958", "SRS18977084", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.86262, null, 0.24391, null, 0.90881, null, 0.52511, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26561, "SRR26173862", "SRX21885957", "SRS18977081", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 F14 R1", "GSM7804197", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 F14 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804197", "GSM7804197: V2a sample2 354 F14 R1; Danio rerio; RNA Seq", "GSM7804197 r1", "GSM7804197", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_F14_R1.fastq.gz", "fastq", 31158875.0, 724625.0, "GSM7804197 r1", "0:43", "A:8769852;C:6707813;G:6866255;T:8814955;N:0", 43, null, null, null, 8769852, 6707813, 6866255, 8814955, 0, "SRX21885957", "SRS18977081", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.8739, null, 0.27254, null, 0.9246, null, 0.54185, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26562, "SRR26173863", "SRX21885956", "SRS18977082", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 F13 R1", "GSM7804196", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 F13 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804196", "GSM7804196: V2a sample2 354 F13 R1; Danio rerio; RNA Seq", "GSM7804196 r1", "GSM7804196", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_F13_R1.fastq.gz", "fastq", 41289804.0, 960228.0, "GSM7804196 r1", "0:43", "A:11114918;C:9358398;G:9568761;T:11247727;N:0", 43, null, null, null, 11114918, 9358398, 9568761, 11247727, 0, "SRX21885956", "SRS18977082", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.82861, null, 0.29409, null, 0.93235, null, 0.49485, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26563, "SRR26173864", "SRX21885955", "SRS18977079", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 F12 R1", "GSM7804195", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 F12 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804195", "GSM7804195: V2a sample2 354 F12 R1; Danio rerio; RNA Seq", "GSM7804195 r1", "GSM7804195", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_F12_R1.fastq.gz", "fastq", 30569259.0, 710913.0, "GSM7804195 r1", "0:43", "A:8286806;C:6854804;G:7028453;T:8399196;N:0", 43, null, null, null, 8286806, 6854804, 7028453, 8399196, 0, "SRX21885955", "SRS18977079", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.80426, null, 0.29136, null, 0.94123, null, 0.54305, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26564, "SRR26173865", "SRX21885954", "SRS18977080", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 F11 R1", "GSM7804194", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 F11 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804194", "GSM7804194: V2a sample2 354 F11 R1; Danio rerio; RNA Seq", "GSM7804194 r1", "GSM7804194", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_F11_R1.fastq.gz", "fastq", 29626097.0, 688979.0, "GSM7804194 r1", "0:43", "A:8063765;C:6645347;G:6803778;T:8113207;N:0", 43, null, null, null, 8063765, 6645347, 6803778, 8113207, 0, "SRX21885954", "SRS18977080", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.84972, null, 0.26423, null, 0.9234, null, 0.54087, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26565, "SRR26173866", "SRX21885953", "SRS18977078", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 F10 R1", "GSM7804193", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 F10 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804193", "GSM7804193: V2a sample2 354 F10 R1; Danio rerio; RNA Seq", "GSM7804193 r1", "GSM7804193", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_F10_R1.fastq.gz", "fastq", 24594409.0, 571963.0, "GSM7804193 r1", "0:43", "A:6605642;C:5535165;G:5682586;T:6771016;N:0", 43, null, null, null, 6605642, 5535165, 5682586, 6771016, 0, "SRX21885953", "SRS18977078", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.77683, null, 0.28872, null, 0.94633, null, 0.52513, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26566, "SRR26173867", "SRX21885952", "SRS18977077", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 E9 R1", "GSM7804168", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 E9 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804168", "GSM7804168: V2a sample2 354 E9 R1; Danio rerio; RNA Seq", "GSM7804168 r1", "GSM7804168", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_E9_R1.fastq.gz", "fastq", 33259941.0, 773487.0, "GSM7804168 r1", "0:43", "A:9004615;C:7506729;G:7674909;T:9073688;N:0", 43, null, null, null, 9004615, 7506729, 7674909, 9073688, 0, "SRX21885952", "SRS18977077", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.85528, null, 0.32094, null, 0.89217, null, 0.50224, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26567, "SRR26173868", "SRX21885951", "SRS18977076", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 E8 R1", "GSM7804167", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 E8 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804167", "GSM7804167: V2a sample2 354 E8 R1; Danio rerio; RNA Seq", "GSM7804167 r1", "GSM7804167", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_E8_R1.fastq.gz", "fastq", 45348316.0, 1054612.0, "GSM7804167 r1", "0:43", "A:12143243;C:10459395;G:10612458;T:12133220;N:0", 43, null, null, null, 12143243, 10459395, 10612458, 12133220, 0, "SRX21885951", "SRS18977076", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.8783, null, 0.19318, null, 0.88572, null, 0.49101, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26568, "SRR26173869", "SRX21885950", "SRS18977075", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 E7 R1", "GSM7804166", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 E7 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804166", "GSM7804166: V2a sample2 354 E7 R1; Danio rerio; RNA Seq", "GSM7804166 r1", "GSM7804166", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_E7_R1.fastq.gz", "fastq", 30522002.0, 709814.0, "GSM7804166 r1", "0:43", "A:8167984;C:7033955;G:7127866;T:8192197;N:0", 43, null, null, null, 8167984, 7033955, 7127866, 8192197, 0, "SRX21885950", "SRS18977075", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.87804, null, 0.20762, null, 0.88418, null, 0.51381, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26569, "SRR26173870", "SRX21885949", "SRS18977074", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 E6 R1", "GSM7804165", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 E6 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804165", "GSM7804165: V2a sample2 354 E6 R1; Danio rerio; RNA Seq", "GSM7804165 r1", "GSM7804165", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_E6_R1.fastq.gz", "fastq", 39095858.0, 909206.0, "GSM7804165 r1", "0:43", "A:10597068;C:8804712;G:8974908;T:10719170;N:0", 43, null, null, null, 10597068, 8804712, 8974908, 10719170, 0, "SRX21885949", "SRS18977074", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.8093, null, 0.38297, null, 0.91545, null, 0.56195, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26570, "SRR26173871", "SRX21885948", "SRS18977073", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 E5 R1", "GSM7804164", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 E5 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804164", "GSM7804164: V2a sample2 354 E5 R1; Danio rerio; RNA Seq", "GSM7804164 r1", "GSM7804164", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_E5_R1.fastq.gz", "fastq", 33632880.0, 782160.0, "GSM7804164 r1", "0:43", "A:9099447;C:7602241;G:7747634;T:9183558;N:0", 43, null, null, null, 9099447, 7602241, 7747634, 9183558, 0, "SRX21885948", "SRS18977073", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.83226, null, 0.28405, null, 0.90715, null, 0.52148, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26571, "SRR26173872", "SRX21885947", "SRS18977072", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 E4 R1", "GSM7804163", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 E4 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804163", "GSM7804163: V2a sample2 354 E4 R1; Danio rerio; RNA Seq", "GSM7804163 r1", "GSM7804163", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_E4_R1.fastq.gz", "fastq", 10823057.0, 251699.0, "GSM7804163 r1", "0:43", "A:3014035;C:2419189;G:2487845;T:2901988;N:0", 43, null, null, null, 3014035, 2419189, 2487845, 2901988, 0, "SRX21885947", "SRS18977072", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.85783, null, 0.26946, null, 0.91033, null, 0.52459, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26572, "SRR26173873", "SRX21885946", "SRS18977068", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 E3 R1", "GSM7804162", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 E3 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804162", "GSM7804162: V2a sample2 354 E3 R1; Danio rerio; RNA Seq", "GSM7804162 r1", "GSM7804162", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_E3_R1.fastq.gz", "fastq", 49775381.0, 1157567.0, "GSM7804162 r1", "0:43", "A:13325978;C:11313973;G:11568082;T:13567348;N:0", 43, null, null, null, 13325978, 11313973, 11568082, 13567348, 0, "SRX21885946", "SRS18977068", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.80873, null, 0.29504, null, 0.93791, null, 0.52789, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26573, "SRR26173874", "SRX21885945", "SRS18977070", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 E2 R1", "GSM7804161", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 E2 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804161", "GSM7804161: V2a sample2 354 E2 R1; Danio rerio; RNA Seq", "GSM7804161 r1", "GSM7804161", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_E2_R1.fastq.gz", "fastq", 44072334.0, 1024938.0, "GSM7804161 r1", "0:43", "A:11780930;C:10068667;G:10185567;T:12037170;N:0", 43, null, null, null, 11780930, 10068667, 10185567, 12037170, 0, "SRX21885945", "SRS18977070", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.78009, null, 0.2621, null, 0.943, null, 0.54719, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26574, "SRR26173875", "SRX21885944", "SRS18977071", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 D1 R1", "GSM7804136", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 D1 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804136", "GSM7804136: V2a sample2 354 D1 R1; Danio rerio; RNA Seq", "GSM7804136 r1", "GSM7804136", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_D1_R1.fastq.gz", "fastq", 49923.0, 1161.0, "GSM7804136 r1", "0:43", "A:12799;C:11604;G:11134;T:14386;N:0", 43, null, null, null, 12799, 11604, 11134, 14386, 0, "SRX21885944", "SRS18977071", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.5773, null, 0.18478, null, 0.99472, null, 0.51097, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26575, "SRR26173876", "SRX21885943", "SRS18977069", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 C24 R1", "GSM7804135", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 C24 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804135", "GSM7804135: V2a sample2 354 C24 R1; Danio rerio; RNA Seq", "GSM7804135 r1", "GSM7804135", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_C24_R1.fastq.gz", "fastq", 30735540.0, 714780.0, "GSM7804135 r1", "0:43", "A:7999390;C:7036767;G:7190113;T:8509270;N:0", 43, null, null, null, 7999390, 7036767, 7190113, 8509270, 0, "SRX21885943", "SRS18977069", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.48457, null, 0.16974, null, 0.99328, null, 0.82979, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26576, "SRR26173877", "SRX21885942", "SRS18977067", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 C23 R1", "GSM7804134", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 C23 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804134", "GSM7804134: V2a sample2 354 C23 R1; Danio rerio; RNA Seq", "GSM7804134 r1", "GSM7804134", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_C23_R1.fastq.gz", "fastq", 24386031.0, 567117.0, "GSM7804134 r1", "0:43", "A:6620599;C:5230020;G:5371347;T:7164065;N:0", 43, null, null, null, 6620599, 5230020, 5371347, 7164065, 0, "SRX21885942", "SRS18977067", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.55183, null, 0.13531, null, 0.99105, null, 0.54904, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26577, "SRR26173878", "SRX21885941", "SRS18977064", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 C22 R1", "GSM7804133", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 C22 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804133", "GSM7804133: V2a sample2 354 C22 R1; Danio rerio; RNA Seq", "GSM7804133 r1", "GSM7804133", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_C22_R1.fastq.gz", "fastq", 35984550.0, 836850.0, "GSM7804133 r1", "0:43", "A:9917644;C:7959027;G:8126203;T:9981676;N:0", 43, null, null, null, 9917644, 7959027, 8126203, 9981676, 0, "SRX21885941", "SRS18977064", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.85473, null, 0.2804, null, 0.91165, null, 0.52909, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26578, "SRR26173879", "SRX21885940", "SRS18977065", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 C21 R1", "GSM7804132", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 C21 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804132", "GSM7804132: V2a sample2 354 C21 R1; Danio rerio; RNA Seq", "GSM7804132 r1", "GSM7804132", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_C21_R1.fastq.gz", "fastq", 32265738.0, 750366.0, "GSM7804132 r1", "0:43", "A:8963112;C:7046873;G:7192067;T:9063686;N:0", 43, null, null, null, 8963112, 7046873, 7192067, 9063686, 0, "SRX21885940", "SRS18977065", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.8426, null, 0.36876, null, 0.91179, null, 0.58759, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26579, "SRR26173880", "SRX21885939", "SRS18977066", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 C20 R1", "GSM7804131", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 C20 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804131", "GSM7804131: V2a sample2 354 C20 R1; Danio rerio; RNA Seq", "GSM7804131 r1", "GSM7804131", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_C20_R1.fastq.gz", "fastq", 33471157.0, 778399.0, "GSM7804131 r1", "0:43", "A:9073629;C:7510863;G:7675381;T:9211284;N:0", 43, null, null, null, 9073629, 7510863, 7675381, 9211284, 0, "SRX21885939", "SRS18977066", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.82141, null, 0.28926, null, 0.93655, null, 0.49873, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26580, "SRR26173881", "SRX21885938", "SRS18977062", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 C19 R1", "GSM7804130", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 C19 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804130", "GSM7804130: V2a sample2 354 C19 R1; Danio rerio; RNA Seq", "GSM7804130 r1", "GSM7804130", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_C19_R1.fastq.gz", "fastq", 30131304.0, 700728.0, "GSM7804130 r1", "0:43", "A:8036932;C:6893678;G:7034855;T:8165839;N:0", 43, null, null, null, 8036932, 6893678, 7034855, 8165839, 0, "SRX21885938", "SRS18977062", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.80896, null, 0.25245, null, 0.94067, null, 0.54072, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26581, "SRR26173882", "SRX21885937", "SRS18977061", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 C18 R1", "GSM7804129", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 C18 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804129", "GSM7804129: V2a sample2 354 C18 R1; Danio rerio; RNA Seq", "GSM7804129 r1", "GSM7804129", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_C18_R1.fastq.gz", "fastq", 31050429.0, 722103.0, "GSM7804129 r1", "0:43", "A:8363024;C:7088111;G:7227301;T:8371993;N:0", 43, null, null, null, 8363024, 7088111, 7227301, 8371993, 0, "SRX21885937", "SRS18977061", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.87399, null, 0.20843, null, 0.89881, null, 0.49682, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26582, "SRR26173883", "SRX21885936", "SRS18977063", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 B17 R1", "GSM7804104", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 B17 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804104", "GSM7804104: V2a sample2 354 B17 R1; Danio rerio; RNA Seq", "GSM7804104 r1", "GSM7804104", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_B17_R1.fastq.gz", "fastq", 47093729.0, 1095203.0, "GSM7804104 r1", "0:43", "A:13057598;C:10185883;G:10457076;T:13393172;N:0", 43, null, null, null, 13057598, 10185883, 10457076, 13393172, 0, "SRX21885936", "SRS18977063", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.80343, null, 0.36098, null, 0.95059, null, 0.52562, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26583, "SRR26173884", "SRX21885935", "SRS18977060", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 B16 R1", "GSM7804103", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 B16 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804103", "GSM7804103: V2a sample2 354 B16 R1; Danio rerio; RNA Seq", "GSM7804103 r1", "GSM7804103", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_B16_R1.fastq.gz", "fastq", 34160791.0, 794437.0, "GSM7804103 r1", "0:43", "A:9178469;C:7729053;G:7901331;T:9351938;N:0", 43, null, null, null, 9178469, 7729053, 7901331, 9351938, 0, "SRX21885935", "SRS18977060", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.79028, null, 0.25695, null, 0.94627, null, 0.51668, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26584, "SRR26173885", "SRX21885934", "SRS18977059", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 B15 R1", "GSM7804102", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 B15 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804102", "GSM7804102: V2a sample2 354 B15 R1; Danio rerio; RNA Seq", "GSM7804102 r1", "GSM7804102", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_B15_R1.fastq.gz", "fastq", 29152495.0, 677965.0, "GSM7804102 r1", "0:43", "A:7966546;C:6516464;G:6675123;T:7994362;N:0", 43, null, null, null, 7966546, 6516464, 6675123, 7994362, 0, "SRX21885934", "SRS18977059", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.83832, null, 0.25969, null, 0.92673, null, 0.51661, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26585, "SRR26173886", "SRX21885933", "SRS18977057", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 B14 R1", "GSM7804101", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 B14 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804101", "GSM7804101: V2a sample2 354 B14 R1; Danio rerio; RNA Seq", "GSM7804101 r1", "GSM7804101", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_B14_R1.fastq.gz", "fastq", 23811379.0, 553753.0, "GSM7804101 r1", "0:43", "A:6532691;C:5215122;G:5353003;T:6710563;N:0", 43, null, null, null, 6532691, 5215122, 5353003, 6710563, 0, "SRX21885933", "SRS18977057", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.74067, null, 0.3282, null, 0.95272, null, 0.49582, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26586, "SRR26173887", "SRX21885932", "SRS18977058", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 B13 R1", "GSM7804100", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 B13 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804100", "GSM7804100: V2a sample2 354 B13 R1; Danio rerio; RNA Seq", "GSM7804100 r1", "GSM7804100", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_B13_R1.fastq.gz", "fastq", 18141356.0, 421892.0, "GSM7804100 r1", "0:43", "A:4926550;C:4092334;G:4186281;T:4936191;N:0", 43, null, null, null, 4926550, 4092334, 4186281, 4936191, 0, "SRX21885932", "SRS18977058", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.87463, null, 0.22642, null, 0.89826, null, 0.50541, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26587, "SRR26173888", "SRX21885931", "SRS18977056", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 B12 R1", "GSM7804099", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 B12 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804099", "GSM7804099: V2a sample2 354 B12 R1; Danio rerio; RNA Seq", "GSM7804099 r1", "GSM7804099", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_B12_R1.fastq.gz", "fastq", 34932039.0, 812373.0, "GSM7804099 r1", "0:43", "A:9555191;C:7704451;G:7897587;T:9774810;N:0", 43, null, null, null, 9555191, 7704451, 7897587, 9774810, 0, "SRX21885931", "SRS18977056", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.80402, null, 0.30224, null, 0.93592, null, 0.53659, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26588, "SRR26173889", "SRX21885930", "SRS18977055", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 B11 R1", "GSM7804098", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 B11 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804098", "GSM7804098: V2a sample2 354 B11 R1; Danio rerio; RNA Seq", "GSM7804098 r1", "GSM7804098", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_B11_R1.fastq.gz", "fastq", 35987087.0, 836909.0, "GSM7804098 r1", "0:43", "A:9801738;C:8047161;G:8248020;T:9890168;N:0", 43, null, null, null, 9801738, 8047161, 8248020, 9890168, 0, "SRX21885930", "SRS18977055", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.81805, null, 0.24526, null, 0.92092, null, 0.54523, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26589, "SRR26173890", "SRX21885929", "SRS18977054", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 B10 R1", "GSM7804097", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 B10 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804097", "GSM7804097: V2a sample2 354 B10 R1; Danio rerio; RNA Seq", "GSM7804097 r1", "GSM7804097", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_B10_R1.fastq.gz", "fastq", 33252846.0, 773322.0, "GSM7804097 r1", "0:43", "A:8996915;C:7433025;G:7633859;T:9189047;N:0", 43, null, null, null, 8996915, 7433025, 7633859, 9189047, 0, "SRX21885929", "SRS18977054", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.78892, null, 0.28622, null, 0.94237, null, 0.53023, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26590, "SRR26173891", "SRX21885928", "SRS18977053", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 A9 R1", "GSM7804072", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 A9 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804072", "GSM7804072: V2a sample2 354 A9 R1; Danio rerio; RNA Seq", "GSM7804072 r1", "GSM7804072", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_A9_R1.fastq.gz", "fastq", 23658600.0, 550200.0, "GSM7804072 r1", "0:43", "A:6447300;C:5342358;G:5472128;T:6396814;N:0", 43, null, null, null, 6447300, 5342358, 5472128, 6396814, 0, "SRX21885928", "SRS18977053", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.86727, null, 0.23136, null, 0.8996, null, 0.52692, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26591, "SRR26173892", "SRX21885927", "SRS18977051", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 A8 R1", "GSM7804071", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 A8 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804071", "GSM7804071: V2a sample2 354 A8 R1; Danio rerio; RNA Seq", "GSM7804071 r1", "GSM7804071", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_A8_R1.fastq.gz", "fastq", 18645187.0, 433609.0, "GSM7804071 r1", "0:43", "A:5151340;C:4145072;G:4243308;T:5105467;N:0", 43, null, null, null, 5151340, 4145072, 4243308, 5105467, 0, "SRX21885927", "SRS18977051", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.86561, null, 0.28633, null, 0.89438, null, 0.53463, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26592, "SRR26173893", "SRX21885926", "SRS18977052", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 A7 R1", "GSM7804070", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 A7 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804070", "GSM7804070: V2a sample2 354 A7 R1; Danio rerio; RNA Seq", "GSM7804070 r1", "GSM7804070", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_A7_R1.fastq.gz", "fastq", 42340466.0, 984662.0, "GSM7804070 r1", "0:43", "A:11373539;C:9660020;G:9840242;T:11466665;N:0", 43, null, null, null, 11373539, 9660020, 9840242, 11466665, 0, "SRX21885926", "SRS18977052", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.81646, null, 0.24599, null, 0.93833, null, 0.57817, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26593, "SRR26173894", "SRX21885925", "SRS18977050", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 A6 R1", "GSM7804069", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 A6 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804069", "GSM7804069: V2a sample2 354 A6 R1; Danio rerio; RNA Seq", "GSM7804069 r1", "GSM7804069", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_A6_R1.fastq.gz", "fastq", 23486858.0, 546206.0, "GSM7804069 r1", "0:43", "A:6654369;C:4998242;G:5115579;T:6718668;N:0", 43, null, null, null, 6654369, 4998242, 5115579, 6718668, 0, "SRX21885925", "SRS18977050", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.84122, null, 0.57245, null, 0.77794, null, 0.53266, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26594, "SRR26173895", "SRX21885924", "SRS18977048", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 A5 R1", "GSM7804068", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 A5 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804068", "GSM7804068: V2a sample2 354 A5 R1; Danio rerio; RNA Seq", "GSM7804068 r1", "GSM7804068", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_A5_R1.fastq.gz", "fastq", 46876450.0, 1090150.0, "GSM7804068 r1", "0:43", "A:12599291;C:10693086;G:10940020;T:12644053;N:0", 43, null, null, null, 12599291, 10693086, 10940020, 12644053, 0, "SRX21885924", "SRS18977048", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.86707, null, 0.22085, null, 0.89412, null, 0.51257, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26595, "SRR26173896", "SRX21885923", "SRS18977049", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 A4 R1", "GSM7804067", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 A4 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804067", "GSM7804067: V2a sample2 354 A4 R1; Danio rerio; RNA Seq", "GSM7804067 r1", "GSM7804067", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_A4_R1.fastq.gz", "fastq", 43487233.0, 1011331.0, "GSM7804067 r1", "0:43", "A:11900913;C:9677048;G:9921622;T:11987650;N:0", 43, null, null, null, 11900913, 9677048, 9921622, 11987650, 0, "SRX21885923", "SRS18977049", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.8409, null, 0.27122, null, 0.91165, null, 0.55221, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26596, "SRR26173897", "SRX21885922", "SRS18977047", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 A3 R1", "GSM7804066", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 A3 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804066", "GSM7804066: V2a sample2 354 A3 R1; Danio rerio; RNA Seq", "GSM7804066 r1", "GSM7804066", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_A3_R1.fastq.gz", "fastq", 44287248.0, 1029936.0, "GSM7804066 r1", "0:43", "A:12065729;C:9907516;G:10143806;T:12170197;N:0", 43, null, null, null, 12065729, 9907516, 10143806, 12170197, 0, "SRX21885922", "SRS18977047", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.80982, null, 0.29232, null, 0.93675, null, 0.5661, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26597, "SRR26173898", "SRX21885921", "SRS18977046", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample2 354 A2 R1", "GSM7804065", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample2 354 A2 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804065", "GSM7804065: V2a sample2 354 A2 R1; Danio rerio; RNA Seq", "GSM7804065 r1", "GSM7804065", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_354_A2_R1.fastq.gz", "fastq", 39822515.0, 926105.0, "GSM7804065 r1", "0:43", "A:10662390;C:9155016;G:9361757;T:10643352;N:0", 43, null, null, null, 10662390, 9155016, 9361757, 10643352, 0, "SRX21885921", "SRS18977046", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.88377, null, 0.19244, null, 0.88627, null, 0.52412, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26598, "SRR26173899", "SRX21885920", "SRS18977044", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 P1 R1", "GSM7804040", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 P1 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804040", "GSM7804040: V2a sample1 353 P1 R1; Danio rerio; RNA Seq", "GSM7804040 r1", "GSM7804040", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_P1_R1.fastq.gz", "fastq", 35622877.0, 828439.0, "GSM7804040 r1", "0:43", "A:10094838;C:7580955;G:7760837;T:10186247;N:0", 43, null, null, null, 10094838, 7580955, 7760837, 10186247, 0, "SRX21885920", "SRS18977044", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.82753, null, 0.38743, null, 0.94085, null, 0.70753, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26599, "SRR26173900", "SRX21885919", "SRS18977045", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 O24 R1", "GSM7804039", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 O24 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804039", "GSM7804039: V2a sample1 353 O24 R1; Danio rerio; RNA Seq", "GSM7804039 r1", "GSM7804039", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_O24_R1.fastq.gz", "fastq", 25162482.0, 585174.0, "GSM7804039 r1", "0:43", "A:6589034;C:5708817;G:5862315;T:7002316;N:0", 43, null, null, null, 6589034, 5708817, 5862315, 7002316, 0, "SRX21885919", "SRS18977045", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.50646, null, 0.15797, null, 0.99086, null, 0.48626, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26600, "SRR26173901", "SRX21885918", "SRS18977043", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 O23 R1", "GSM7804038", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 O23 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804038", "GSM7804038: V2a sample1 353 O23 R1; Danio rerio; RNA Seq", "GSM7804038 r1", "GSM7804038", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_O23_R1.fastq.gz", "fastq", 21378396.0, 497172.0, "GSM7804038 r1", "0:43", "A:5419690;C:4870276;G:5019946;T:6068484;N:0", 43, null, null, null, 5419690, 4870276, 5019946, 6068484, 0, "SRX21885918", "SRS18977043", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.4177, null, 0.18826, null, 0.99344, null, 0.78066, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26601, "SRR26173902", "SRX21885917", "SRS18977042", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 O22 R1", "GSM7804037", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 O22 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804037", "GSM7804037: V2a sample1 353 O22 R1; Danio rerio; RNA Seq", "GSM7804037 r1", "GSM7804037", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_O22_R1.fastq.gz", "fastq", 30321665.0, 705155.0, "GSM7804037 r1", "0:43", "A:8123534;C:6839326;G:6921711;T:8437094;N:0", 43, null, null, null, 8123534, 6839326, 6921711, 8437094, 0, "SRX21885917", "SRS18977042", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.76574, null, 0.24445, null, 0.94014, null, 0.51811, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26602, "SRR26173903", "SRX21885916", "SRS18977041", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 O21 R1", "GSM7804036", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 O21 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804036", "GSM7804036: V2a sample1 353 O21 R1; Danio rerio; RNA Seq", "GSM7804036 r1", "GSM7804036", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_O21_R1.fastq.gz", "fastq", 24544916.0, 570812.0, "GSM7804036 r1", "0:43", "A:6528543;C:5656479;G:5771413;T:6588481;N:0", 43, null, null, null, 6528543, 5656479, 5771413, 6588481, 0, "SRX21885916", "SRS18977041", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.87756, null, 0.17329, null, 0.88124, null, 0.51427, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26603, "SRR26173904", "SRX21885915", "SRS18977040", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 O20 R1", "GSM7804035", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 O20 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804035", "GSM7804035: V2a sample1 353 O20 R1; Danio rerio; RNA Seq", "GSM7804035 r1", "GSM7804035", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_O20_R1.fastq.gz", "fastq", 27471324.0, 638868.0, "GSM7804035 r1", "0:43", "A:7349212;C:6154048;G:6323796;T:7644268;N:0", 43, null, null, null, 7349212, 6154048, 6323796, 7644268, 0, "SRX21885915", "SRS18977040", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.7529, null, 0.26778, null, 0.94635, null, 0.5148, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26604, "SRR26173905", "SRX21885914", "SRS18977039", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 O19 R1", "GSM7804034", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 O19 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804034", "GSM7804034: V2a sample1 353 O19 R1; Danio rerio; RNA Seq", "GSM7804034 r1", "GSM7804034", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_O19_R1.fastq.gz", "fastq", 24908137.0, 579259.0, "GSM7804034 r1", "0:43", "A:6706594;C:5634956;G:5764632;T:6801955;N:0", 43, null, null, null, 6706594, 5634956, 5764632, 6801955, 0, "SRX21885914", "SRS18977039", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.8525, null, 0.23739, null, 0.90694, null, 0.5194, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26605, "SRR26173906", "SRX21885913", "SRS18977038", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 O18 R1", "GSM7804033", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 O18 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804033", "GSM7804033: V2a sample1 353 O18 R1; Danio rerio; RNA Seq", "GSM7804033 r1", "GSM7804033", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_O18_R1.fastq.gz", "fastq", 23328790.0, 542530.0, "GSM7804033 r1", "0:43", "A:6296932;C:5290824;G:5423100;T:6317934;N:0", 43, null, null, null, 6296932, 5290824, 5423100, 6317934, 0, "SRX21885913", "SRS18977038", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.87485, null, 0.19256, null, 0.88422, null, 0.46891, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26606, "SRR26173907", "SRX21885912", "SRS18977037", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 N17 R1", "GSM7804008", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 N17 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804008", "GSM7804008: V2a sample1 353 N17 R1; Danio rerio; RNA Seq", "GSM7804008 r1", "GSM7804008", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_N17_R1.fastq.gz", "fastq", 20379592.0, 473944.0, "GSM7804008 r1", "0:43", "A:5592768;C:4503044;G:4602811;T:5680969;N:0", 43, null, null, null, 5592768, 4503044, 4602811, 5680969, 0, "SRX21885912", "SRS18977037", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.84619, null, 0.24373, null, 0.94095, null, 0.4423, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26607, "SRR26173908", "SRX21885911", "SRS18977035", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 N16 R1", "GSM7804007", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 N16 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804007", "GSM7804007: V2a sample1 353 N16 R1; Danio rerio; RNA Seq", "GSM7804007 r1", "GSM7804007", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_N16_R1.fastq.gz", "fastq", 14151343.0, 329101.0, "GSM7804007 r1", "0:43", "A:3796916;C:3223155;G:3290919;T:3840353;N:0", 43, null, null, null, 3796916, 3223155, 3290919, 3840353, 0, "SRX21885911", "SRS18977035", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.85097, null, 0.21705, null, 0.93097, null, 0.52334, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26608, "SRR26173909", "SRX21885910", "SRS18977036", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 N15 R1", "GSM7804006", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 N15 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804006", "GSM7804006: V2a sample1 353 N15 R1; Danio rerio; RNA Seq", "GSM7804006 r1", "GSM7804006", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_N15_R1.fastq.gz", "fastq", 16536209.0, 384563.0, "GSM7804006 r1", "0:43", "A:4473687;C:3744698;G:3838620;T:4479204;N:0", 43, null, null, null, 4473687, 3744698, 3838620, 4479204, 0, "SRX21885910", "SRS18977036", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.88744, null, 0.19834, null, 0.89966, null, 0.5281, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26609, "SRR26173910", "SRX21885909", "SRS18977034", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 N14 R1", "GSM7804005", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 N14 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804005", "GSM7804005: V2a sample1 353 N14 R1; Danio rerio; RNA Seq", "GSM7804005 r1", "GSM7804005", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_N14_R1.fastq.gz", "fastq", 16039215.0, 373005.0, "GSM7804005 r1", "0:43", "A:4355837;C:3605999;G:3695364;T:4382015;N:0", 43, null, null, null, 4355837, 3605999, 3695364, 4382015, 0, "SRX21885909", "SRS18977034", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.86632, null, 0.22226, null, 0.90268, null, 0.5092, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26610, "SRR26173911", "SRX21885908", "SRS18977033", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 N13 R1", "GSM7804004", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 N13 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804004", "GSM7804004: V2a sample1 353 N13 R1; Danio rerio; RNA Seq", "GSM7804004 r1", "GSM7804004", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_N13_R1.fastq.gz", "fastq", 15280910.0, 355370.0, "GSM7804004 r1", "0:43", "A:4072742;C:3469231;G:3555056;T:4183881;N:0", 43, null, null, null, 4072742, 3469231, 3555056, 4183881, 0, "SRX21885908", "SRS18977033", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.73874, null, 0.31529, null, 0.95988, null, 0.5442, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26611, "SRR26173912", "SRX21885907", "SRS18977032", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 N12 R1", "GSM7804003", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 N12 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804003", "GSM7804003: V2a sample1 353 N12 R1; Danio rerio; RNA Seq", "GSM7804003 r1", "GSM7804003", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_N12_R1.fastq.gz", "fastq", 10529926.0, 244882.0, "GSM7804003 r1", "0:43", "A:2835885;C:2354590;G:2390746;T:2948705;N:0", 43, null, null, null, 2835885, 2354590, 2390746, 2948705, 0, "SRX21885907", "SRS18977032", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.74571, null, 0.36729, null, 0.9443, null, 0.77069, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26612, "SRR26173913", "SRX21885906", "SRS18977030", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 N11 R1", "GSM7804002", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 N11 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804002", "GSM7804002: V2a sample1 353 N11 R1; Danio rerio; RNA Seq", "GSM7804002 r1", "GSM7804002", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_N11_R1.fastq.gz", "fastq", 21706271.0, 504797.0, "GSM7804002 r1", "0:43", "A:5853146;C:4922477;G:5009970;T:5920678;N:0", 43, null, null, null, 5853146, 4922477, 5009970, 5920678, 0, "SRX21885906", "SRS18977030", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.8394, null, 0.23984, null, 0.93468, null, 0.51881, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26613, "SRR26173914", "SRX21885905", "SRS18977031", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 N10 R1", "GSM7804001", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 N10 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7804001", "GSM7804001: V2a sample1 353 N10 R1; Danio rerio; RNA Seq", "GSM7804001 r1", "GSM7804001", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_N10_R1.fastq.gz", "fastq", 22772585.0, 529595.0, "GSM7804001 r1", "0:43", "A:6225918;C:5071489;G:5184079;T:6291099;N:0", 43, null, null, null, 6225918, 5071489, 5184079, 6291099, 0, "SRX21885905", "SRS18977031", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.83486, null, 0.27703, null, 0.92433, null, 0.54887, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26614, "SRR26173915", "SRX21885904", "SRS18977029", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 M9 R1", "GSM7803976", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 M9 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7803976", "GSM7803976: V2a sample1 353 M9 R1; Danio rerio; RNA Seq", "GSM7803976 r1", "GSM7803976", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_M9_R1.fastq.gz", "fastq", 19698730.0, 458110.0, "GSM7803976 r1", "0:43", "A:5282525;C:4494162;G:4591316;T:5330727;N:0", 43, null, null, null, 5282525, 4494162, 4591316, 5330727, 0, "SRX21885904", "SRS18977029", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.8598, null, 0.23744, null, 0.90871, null, 0.52081, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26615, "SRR26173916", "SRX21885903", "SRS18977028", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 M8 R1", "GSM7803975", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 M8 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7803975", "GSM7803975: V2a sample1 353 M8 R1; Danio rerio; RNA Seq", "GSM7803975 r1", "GSM7803975", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_M8_R1.fastq.gz", "fastq", 19646485.0, 456895.0, "GSM7803975 r1", "0:43", "A:5214519;C:4539724;G:4616920;T:5275322;N:0", 43, null, null, null, 5214519, 4539724, 4616920, 5275322, 0, "SRX21885903", "SRS18977028", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.82407, null, 0.22367, null, 0.94298, null, 0.50209, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26616, "SRR26173917", "SRX21885902", "SRS18977025", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 M7 R1", "GSM7803974", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 M7 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7803974", "GSM7803974: V2a sample1 353 M7 R1; Danio rerio; RNA Seq", "GSM7803974 r1", "GSM7803974", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_M7_R1.fastq.gz", "fastq", 7333994.0, 170558.0, "GSM7803974 r1", "0:43", "A:1958042;C:1671444;G:1690497;T:2014011;N:0", 43, null, null, null, 1958042, 1671444, 1690497, 2014011, 0, "SRX21885902", "SRS18977025", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.77392, null, 0.29548, null, 0.95114, null, 0.51367, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26617, "SRR26173918", "SRX21885901", "SRS18977027", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 M6 R1", "GSM7803973", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 M6 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7803973", "GSM7803973: V2a sample1 353 M6 R1; Danio rerio; RNA Seq", "GSM7803973 r1", "GSM7803973", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_M6_R1.fastq.gz", "fastq", 23546413.0, 547591.0, "GSM7803973 r1", "0:43", "A:6369803;C:5317401;G:5430197;T:6429012;N:0", 43, null, null, null, 6369803, 5317401, 5430197, 6429012, 0, "SRX21885901", "SRS18977027", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.85602, null, 0.25223, null, 0.92654, null, 0.5306, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26618, "SRR26173919", "SRX21885900", "SRS18977026", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 M5 R1", "GSM7803972", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 M5 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7803972", "GSM7803972: V2a sample1 353 M5 R1; Danio rerio; RNA Seq", "GSM7803972 r1", "GSM7803972", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_M5_R1.fastq.gz", "fastq", 32919424.0, 765568.0, "GSM7803972 r1", "0:43", "A:8685316;C:7623131;G:7771679;T:8839298;N:0", 43, null, null, null, 8685316, 7623131, 7771679, 8839298, 0, "SRX21885900", "SRS18977026", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.80691, null, 0.23128, null, 0.95404, null, 0.45556, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26619, "SRR26173920", "SRX21885899", "SRS18977024", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 M4 R1", "GSM7803971", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 M4 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7803971", "GSM7803971: V2a sample1 353 M4 R1; Danio rerio; RNA Seq", "GSM7803971 r1", "GSM7803971", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_M4_R1.fastq.gz", "fastq", 27743858.0, 645206.0, "GSM7803971 r1", "0:43", "A:7502879;C:6275733;G:6399007;T:7566239;N:0", 43, null, null, null, 7502879, 6275733, 6399007, 7566239, 0, "SRX21885899", "SRS18977024", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.84534, null, 0.24169, null, 0.92131, null, 0.52033, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26620, "SRR26173921", "SRX21885898", "SRS18977023", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 M3 R1", "GSM7803970", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 M3 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7803970", "GSM7803970: V2a sample1 353 M3 R1; Danio rerio; RNA Seq", "GSM7803970 r1", "GSM7803970", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_M3_R1.fastq.gz", "fastq", 31646753.0, 735971.0, "GSM7803970 r1", "0:43", "A:8540660;C:7169606;G:7344972;T:8591515;N:0", 43, null, null, null, 8540660, 7169606, 7344972, 8591515, 0, "SRX21885898", "SRS18977023", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.86607, null, 0.22984, null, 0.90905, null, 0.52816, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26621, "SRR26173922", "SRX21885897", "SRS18977019", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 M2 R1", "GSM7803969", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 M2 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7803969", "GSM7803969: V2a sample1 353 M2 R1; Danio rerio; RNA Seq", "GSM7803969 r1", "GSM7803969", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_M2_R1.fastq.gz", "fastq", 18262487.0, 424709.0, "GSM7803969 r1", "0:43", "A:4905794;C:4167223;G:4257561;T:4931909;N:0", 43, null, null, null, 4905794, 4167223, 4257561, 4931909, 0, "SRX21885897", "SRS18977019", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.87727, null, 0.19789, null, 0.88327, null, 0.51404, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26622, "SRR26173923", "SRX21885896", "SRS18977022", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 L1 R1", "GSM7803944", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 L1 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7803944", "GSM7803944: V2a sample1 353 L1 R1; Danio rerio; RNA Seq", "GSM7803944 r1", "GSM7803944", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_L1_R1.fastq.gz", "fastq", 39261064.0, 913048.0, "GSM7803944 r1", "0:43", "A:10675714;C:8831605;G:9068828;T:10684917;N:0", 43, null, null, null, 10675714, 8831605, 9068828, 10684917, 0, "SRX21885896", "SRS18977022", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.87519, null, 0.20246, null, 0.89696, null, 0.53416, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26623, "SRR26173924", "SRX21885895", "SRS18977020", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 K24 R1", "GSM7803943", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 K24 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7803943", "GSM7803943: V2a sample1 353 K24 R1; Danio rerio; RNA Seq", "GSM7803943 r1", "GSM7803943", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_K24_R1.fastq.gz", "fastq", 10877753.0, 252971.0, "GSM7803943 r1", "0:43", "A:2828581;C:2427642;G:2504205;T:3117325;N:0", 43, null, null, null, 2828581, 2427642, 2504205, 3117325, 0, "SRX21885895", "SRS18977020", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.43358, null, 0.14805, null, 0.96483, null, 0.89489, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26624, "SRR26173925", "SRX21885894", "SRS18977021", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 K23 R1", "GSM7803942", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 K23 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7803942", "GSM7803942: V2a sample1 353 K23 R1; Danio rerio; RNA Seq", "GSM7803942 r1", "GSM7803942", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_K23_R1.fastq.gz", "fastq", 11967287.0, 278309.0, "GSM7803942 r1", "0:43", "A:3236216;C:2487815;G:2583125;T:3660131;N:0", 43, null, null, null, 3236216, 2487815, 2583125, 3660131, 0, "SRX21885894", "SRS18977021", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.45352, null, 0.10712, null, 0.99249, null, 0.66514, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26625, "SRR26173926", "SRX21885893", "SRS18977016", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 K22 R1", "GSM7803941", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 K22 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7803941", "GSM7803941: V2a sample1 353 K22 R1; Danio rerio; RNA Seq", "GSM7803941 r1", "GSM7803941", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_K22_R1.fastq.gz", "fastq", 27851702.0, 647714.0, "GSM7803941 r1", "0:43", "A:7549377;C:6154745;G:6313649;T:7833931;N:0", 43, null, null, null, 7549377, 6154745, 6313649, 7833931, 0, "SRX21885893", "SRS18977016", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.75496, null, 0.26752, null, 0.9472, null, 0.55385, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26626, "SRR26173927", "SRX21885892", "SRS18977017", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 K21 R1", "GSM7803940", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 K21 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7803940", "GSM7803940: V2a sample1 353 K21 R1; Danio rerio; RNA Seq", "GSM7803940 r1", "GSM7803940", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_K21_R1.fastq.gz", "fastq", 25669151.0, 596957.0, "GSM7803940 r1", "0:43", "A:6873604;C:5886019;G:6019889;T:6889639;N:0", 43, null, null, null, 6873604, 5886019, 6019889, 6889639, 0, "SRX21885892", "SRS18977017", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.88089, null, 0.15861, null, 0.87988, null, 0.53381, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26627, "SRR26173928", "SRX21885891", "SRS18977018", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 K20 R1", "GSM7803939", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 K20 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7803939", "GSM7803939: V2a sample1 353 K20 R1; Danio rerio; RNA Seq", "GSM7803939 r1", "GSM7803939", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_K20_R1.fastq.gz", "fastq", 21481940.0, 499580.0, "GSM7803939 r1", "0:43", "A:5797700;C:4860618;G:4983240;T:5840382;N:0", 43, null, null, null, 5797700, 4860618, 4983240, 5840382, 0, "SRX21885891", "SRS18977018", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.86105, null, 0.23237, null, 0.90134, null, 0.52076, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26628, "SRR26173929", "SRX21885890", "SRS18977014", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 K19 R1", "GSM7803938", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 K19 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7803938", "GSM7803938: V2a sample1 353 K19 R1; Danio rerio; RNA Seq", "GSM7803938 r1", "GSM7803938", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_K19_R1.fastq.gz", "fastq", 23007709.0, 535063.0, "GSM7803938 r1", "0:43", "A:6158988;C:5204570;G:5321940;T:6322211;N:0", 43, null, null, null, 6158988, 5204570, 5321940, 6322211, 0, "SRX21885890", "SRS18977014", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.78733, null, 0.25377, null, 0.94556, null, 0.53829, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26629, "SRR26173930", "SRX21885889", "SRS18977015", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 K18 R1", "GSM7803937", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 K18 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7803937", "GSM7803937: V2a sample1 353 K18 R1; Danio rerio; RNA Seq", "GSM7803937 r1", "GSM7803937", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_K18_R1.fastq.gz", "fastq", 25088565.0, 583455.0, "GSM7803937 r1", "0:43", "A:6762035;C:5659600;G:5805722;T:6861208;N:0", 43, null, null, null, 6762035, 5659600, 5805722, 6861208, 0, "SRX21885889", "SRS18977015", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.83379, null, 0.22893, null, 0.9251, null, 0.51495, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26630, "SRR26173931", "SRX21885888", "SRS18977011", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 J17 R1", "GSM7803912", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 J17 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7803912", "GSM7803912: V2a sample1 353 J17 R1; Danio rerio; RNA Seq", "GSM7803912 r1", "GSM7803912", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_J17_R1.fastq.gz", "fastq", 24235359.0, 563613.0, "GSM7803912 r1", "0:43", "A:6687906;C:5244266;G:5377965;T:6925222;N:0", 43, null, null, null, 6687906, 5244266, 5377965, 6925222, 0, "SRX21885888", "SRS18977011", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.80212, null, 0.29984, null, 0.94769, null, 0.57954, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26631, "SRR26173932", "SRX21885887", "SRS18977013", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 J16 R1", "GSM7803911", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 J16 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7803911", "GSM7803911: V2a sample1 353 J16 R1; Danio rerio; RNA Seq", "GSM7803911 r1", "GSM7803911", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_J16_R1.fastq.gz", "fastq", 27111973.0, 630511.0, "GSM7803911 r1", "0:43", "A:7217001;C:6181115;G:6340909;T:7372948;N:0", 43, null, null, null, 7217001, 6181115, 6340909, 7372948, 0, "SRX21885887", "SRS18977013", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.71684, null, 0.26529, null, 0.94491, null, 0.50602, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26632, "SRR26173933", "SRX21885886", "SRS18977010", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 J15 R1", "GSM7803910", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 J15 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7803910", "GSM7803910: V2a sample1 353 J15 R1; Danio rerio; RNA Seq", "GSM7803910 r1", "GSM7803910", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_J15_R1.fastq.gz", "fastq", 23290391.0, 541637.0, "GSM7803910 r1", "0:43", "A:6290890;C:5279983;G:5398604;T:6320914;N:0", 43, null, null, null, 6290890, 5279983, 5398604, 6320914, 0, "SRX21885886", "SRS18977010", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.85285, null, 0.2328, null, 0.92214, null, 0.51744, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"], [26633, "SRR26173934", "SRX21885885", "SRS18977012", "SRP463130", "PRJNA1020854", "Molecular blueprints for spinal circuit modules controlling locomotor speed", "GSE243993", "Transcriptome Analysis", "The flexibility of motor actions is ingrained in the diversity of neurons and how they are organized into functional circuit modules  yet our knowledge of the molecular underpinning of motor circuit modularity remains limited. Locomotion is a motor behavior characterized by sudden changes in speed and strength enabled by the coordinated recruitment of different motoneuron subtypes. Here we use adult zebrafish to link the molecular diversity of motoneurons and the rhythm generating V2a interneurons with their modular circuit organization that is responsible for changes in locomotor speed. We show that the molecular diversity of motoneurons and V2a interneurons reflects their functional segregation into slow  intermediate or fast subtypes. Furthermore  we reveal shared molecular signatures between V2a interneurons and motoneurons of the three speed circuit modules. Overall  by characterizing how the molecular diversity of motoneurons and V2a interneurons relates to their function  connectivity and behavior  our study provides important insights not only into the molecular mechanisms for neuronal and circuit diversity for locomotor flexibility but also for charting circuits for motor actions in general. Overall design: To determine whether the functional subtypes of motoneurons and V2a Chx10+ interneurons are molecularly distinct  we performed single cell RNA sequencing respectively on adult islet1a:GFP and chx10:GFP transgenic zebrafish using SmartSeq2.", null, "pubmed:37919423", null, "V2a sample1 353 J14 R1", "GSM7803909", null, "source name:Spinal cord|tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons|geo loc name:missing|collection date:missing", "V2a sample1 353 J14 R1", "The reads from each sequenced cell were mapped to the zebrafish reference genome \u201cDanio rerio  Ensembl  GRCz11\u201d using STAR version 2.5.3a. The resulting bam files were filtered to keep only uniquely mapped reads. Most of the following analysis was performed in R version 4.0.5  R core team  2022 using the Seurat package version 4.0.2. Assembly: GRCz11 Supplementary files format and content: .csv files with gene count matrixes; .txt and .csv metadata files and .rds files containing R objects from Seurat analysis", "Spinal cord", null, "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "tissue:Spinal cord|cell line:Chx10:GFP|cell type:V2a interneurons", "GSM7803909", "GSM7803909: V2a sample1 353 J14 R1; Danio rerio; RNA Seq", "GSM7803909 r1", "GSM7803909", "1", "Adult animals 7 wpf of either sex were deeply anesthetized in a slush of frozen extracellular solution containing in mM: 134 NaCl  2.9 KCl  2.1 CaCl2  1.2 MgCl2  10 HEPES and 10 glucose  with pH of 7.8 adjusted with NaOH and osmolarity of 290 mOsm. The spinal cord was quickly dissected in the slush of frozen extracellular solution and collected. Two samples were prepared from the Tgislet1a:GFP line  and two samples were prepared from the Tgchx10:GFP line. For each sample  6 to 10 intact isolated spinal cords were incubated in 1 ml of DMEM F12 medium Thermo Fisher  #11039021  osmolarity adjusted to 280 280 mOsm containing papain 10 U/ml Worthington biochem  #LK003178 on a heated shaker at 37\u00b0C for 15 min. DMEM/F 12 1 ml  280 290 mOsm was added to stop the enzymatic reaction. The sample was centrifuged at 300 g at 4\u00b0C for 5 min  and then re suspended in 0.5 ml of DMEM/F 12 280 290 mOsm post removal of the supernatant. Following mechanical trituration using fire polished Pasteur pipettes  the cell suspension was filtered through a cell 16 strainer 40 \u03bcm. The sample was kept at room temperature for 20 min post the addition of 0 1 ml of the nuclear DNA stain DRAQ5 Thermo Fisher  #65 0880 92. Using fluorescence activated cell sorting FACs  cells positive for GFP and DRAQ5 in each sample were sorted into a 384 wells plate containing a mild hypotonic lysis buffer 0.2% Triton X 100  2 U/ml RNase inhibitor and immediately snap frozen on ice  then stored at  80\u00b0C. Smart Seq2", null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "cDNA", "SINGLE", "ILLUMINA", "Illumina HiSeq 2000", null, "SRP463130", null, null, "SS2_18_353_J14_R1.fastq.gz", "fastq", 22177637.0, 515759.0, "GSM7803909 r1", "0:43", "A:5946858;C:4992625;G:5124052;T:6114102;N:0", 43, null, null, null, 5946858, 4992625, 5124052, 6114102, 0, "SRX21885885", "SRS18977012", "SRA1719948", "Neuroscience, Karolinaska Institutet", "Neuroscience, Karolinaska Institutet", 1, 0.75767, null, 0.28218, null, 0.95394, null, 0.44926, null, 43, null, "B", null, "usable mapping rate", "illumina", "hiseq_era", "unknown", "cdna_unspecified", "unknown", "sc", "single_cell_plate", "smartseq", null, "Sweden", "2023-09-25", "Juvenile", "Juvenile", "Spinal Cord", "Nervous System"]], "truncated": false, "filtered_table_rows_count": 1575, "expanded_columns": [], "expandable_columns": [], "columns": ["rowid", "run.accession", "experiment.accession", "sample.accession", "study.accession", "bioproject", "study.title", "study.alias", "study.type", "study.abstract", "study.attributes", "study.PMIDs", "sample.description", "sample.title", "sample.alias", "sample.centername", "sample.attributes", "GEOsample.title", "GEOsample.dataprocessing", "GEOsample.source", "GEOsample.treatmentprotocol", "GEOsample.extractprotocol", "GEOsample.growthprotocol", "GEOsample.characteristics", "GEOsample.accession", "experiment.title", "experiment.alias", "experiment.library_name", "experiment.design_description", "experiment.library_construction_protocol", "experiment.attributes", "experiment.library_strategy", "experiment.library_source", "experiment.library_selection", "experiment.library_layout", "experiment.platform", "experiment.instrument_model", "experiment.spot_descriptor", "experiment.study_ref", "run.title", "run.attributes", "run.filename", "run.semantic_name", "run.total_bases", "run.total_spots", "run.alias", "run.read_lengths", "run.base_counts", "run.r1_length", "run.r2_length", "run.r3_length", 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devstage_curation, devstage_curation_coarse, tissue_curation, tissue_curation_coarse from run_metadata where \"experiment.library_selection\" = :p0 and \"experiment.library_source\" = :p1 and \"tissue_curation\" = :p2 order by rowid limit 101", "params": {"p0": "cDNA", "p1": "TRANSCRIPTOMIC SINGLE CELL", "p2": "Spinal Cord"}}, "facet_results": {"experiment.library_strategy": {"name": "experiment.library_strategy", "type": "column", "hideable": false, "toggle_url": "/metadata/run_metadata.json?experiment.library_selection=cDNA&experiment.library_source=TRANSCRIPTOMIC+SINGLE+CELL&tissue_curation=Spinal+Cord", "results": [{"value": "RNA-Seq", "label": "RNA-Seq", "count": 1575, "toggle_url": "http://metadata.rnaquarium.org/metadata/run_metadata.json?experiment.library_selection=cDNA&experiment.library_source=TRANSCRIPTOMIC+SINGLE+CELL&tissue_curation=Spinal+Cord&experiment.library_strategy=RNA-Seq", "selected": false}], "truncated": false}, "experiment.library_source": {"name": 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