{"database": "metadata", "table": "run_metadata", "rows": [[31965, "SRR28832524", "SRX24395269", "SRS21150710", "SRP504662", "PRJNA1105232", "Loss of alpha Ba crystallin  but not alpha A crystallin  increases age related cataract in the zebrafish lens", "PRJNA1105232", "Other", "The vertebrate eye lens is an unusual organ in that most of its cells lack nuclei and the ability to replace aging protein. The small heat shock protein alpha crystallins evolved to become key components of this lens  possibly because of their ability to prevent aggregation of aging protein that would otherwise lead to lens opacity. Most vertebrates express two alpha crystallins  alpha A  and alpha B crystallin  and mutations in each are linked to human cataract. In a mouse knockout model only the loss of alpha A crystallin led to early stage lens cataract. We have used the zebrafish as a model system to investigate the role of alpha crystallins during lens development. Interestingly  while zebrafish express one lens specific alpha A crystallin gene cryaa  they express two alpha B crystallin genes  with one evolving lens specificity cryaba and the other retaining the broad expression of its mammalian ortholog cryabb. In this study we used individual mutant zebrafish lines for all three alpha crystallin genes to determine the impact of their loss on age related cataract. Surprisingly  unlike mouse knockout models  we found that the loss of the alpha Ba crystallin gene cryaba led to an increase in lens opacity compared to cryaa null fish at 24 month of age. Loss of alpha A crystallin did not increase the prevalence of cataract. We also used single cell RNA Seq and RT qPCR data to show a shift in the lens expression of zebrafish alpha crystallins between 5 dpf and 10 dpf dpf  with 5 dpf and 6 dpf lenses expressing cryaa almost exclusively  and expression of cryaba and cryabb becoming more prominent post 10 dpf. These data show that cryaa is the primary alpha crystallin during early lens development  while the protective role for cryaba becomes more important during lens aging. This study is the first to quantify cataract prevalence in wild type zebrafish  showing that lens opacities develop in approximately 25% of fish by 18 month of age. None of the three alpha crystallin mutants showed a compensatory increase in the expression of the remaining two crystallins  or in the abundant beta B1 crystallin. Overall  these findings indicate an ontogenetic shift in the functional importance of individual alpha crystallins during zebrafish lens development. Our finding that the lens specific zebrafish alpha Ba crystallin plays the leading role in preventing age related cataract adds a new twist to our understanding of vertebrate lens evolution.", null, null, null, null, "6b", null, "strain:ABC|dev stage:6 dpf|collection date:2020 10|geo loc name:USA: Oregon|sex:N/A|tissue:whole larvae|treatment:replicate B|BioSampleModel:Model organism or animal", null, null, null, null, null, null, null, null, "scRNA seq of whole zebrafish larvae", "6b", "6b", "10X Chromium", null, null, "RNA-Seq", "TRANSCRIPTOMIC SINGLE CELL", "Oligo-dT", "PAIRED", "ILLUMINA", "Illumina HiSeq 4000", null, "SRP504662", null, null, "6b_concatenated_R1.fastq.gz 6b_concatenated_R2.fastq.gz", "fastq fastq", 69567742683.0, 539284827.0, "6b concatenated R1.fastq.gz", "0:28 1:101", "A:19762887143;C:15877063714;G:15450633995;T:18460750107;N:16407724", 28, 101, null, null, 19762887143, 15877063714, 15450633995, 18460750107, 16407724, "SRX24395269", "SRS21150710", "SRA1854140", "University of Oregon|Institute of Neuroscience", "University of Oregon", null, null, null, null, null, null, null, null, null, null, null, "T", "B", "sc-like readlen", "illumina", "hiseq_era", "unknown", "poly_a", "unknown", "sc", "single_cell_droplet", "10x", null, "United States", "2024-04-29", "Larval", "Larval", "Whole Organism", "All anatomical structures"]], "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", "run.r4_length", "run.Acount", "run.Ccount", "run.Gcount", "run.Tcount", "run.Ncount", "run.experiment", "run.pool_member", "submission.accession", "submission.srasource", "submission.bioprojectsource", "seqdetective.n_mates", "seqdetective.mapping_rate.mate1", "seqdetective.mapping_rate.mate2", "seqdetective.nofeature_rate.mate1", "seqdetective.nofeature_rate.mate2", "seqdetective.sparsity.mate1", "seqdetective.sparsity.mate2", "seqdetective.pos_strand_rate.mate1", "seqdetective.pos_strand_rate.mate2", "seqdetective.readlen.mate1", "seqdetective.readlen.mate2", "seqdetective.judgement.mate1", "seqdetective.judgement.mate2", "seqdetective.judgement.reason", "platform_family", "instrument_generation", "read_bias", "selection_class", "prep_kit", "sc_or_bulk", "tech_class", "technology", "tech_variant", "submission.bioprojectsource.country", "earliest_date", "devstage_curation", "devstage_curation_coarse", "tissue_curation", "tissue_curation_coarse"], "primary_keys": ["rowid"], "primary_key_values": ["31965"], "units": {}, "query_ms": 11.40414399560541}