{"gene":"CATSPER3","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":2007,"finding":"Targeted disruption of murine CatSper3 abrogates the sperm-specific Ca2+-selective current (ICatSper), sperm hyperactivated motility, and male fertility without affecting spermatogenesis or initial motility. Direct protein interactions among all four CatSper subunits were demonstrated, indicating CatSper3 is an essential component of the heterotetrameric CatSper channel complex in the sperm flagellum.","method":"Targeted gene knockout in mice, patch-clamp electrophysiology (ICatSper recording), co-immunoprecipitation to demonstrate direct protein interactions, sperm motility analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 — genetic KO with defined electrophysiological readout (loss of ICatSper) plus reciprocal protein interaction data; replicated in a second independent study (PMID:17344468)","pmids":["17227845"],"is_preprint":false},{"year":2007,"finding":"CatSper3 knockout male mice are completely infertile due to rapid loss of motility and absence of hyperactivated motility under capacitating conditions, confirming that CATSPER3 is required for sperm hyperactivation during capacitation.","method":"Targeted gene knockout in mice, sperm motility analysis under capacitating and non-capacitating conditions, fertility testing","journal":"Biology of reproduction","confidence":"High","confidence_rationale":"Tier 2 — independent KO study replicating the hyperactivation/infertility phenotype with defined cellular readout","pmids":["17344468"],"is_preprint":false},{"year":2003,"finding":"CatSper3 contains a single channel-forming domain with the consensus pore-loop sequence TxDxW and a C-terminal coiled-coil protein-protein interaction domain conserved across all four CatSper proteins, supporting the hypothesis that CatSper1-4 form a functional heterotetrameric channel in sperm.","method":"In silico gene identification, sequence analysis, domain prediction (coiled-coil prediction), RT-PCR for testis-specific expression","journal":"Reproductive biology and endocrinology : RB&E","confidence":"Medium","confidence_rationale":"Tier 3 — computational domain identification with expression data; coiled-coil interaction domain prediction later supported by functional KO studies","pmids":["12932298"],"is_preprint":false},{"year":2020,"finding":"A homozygous loss-of-function mutation in human CATSPER3 (p.L236*) causes male infertility characterized by failure of sperm acrosome reaction without defects in routine semen parameters, establishing a direct role for CATSPER3 in the acrosome reaction in human sperm.","method":"Whole-exome sequencing, Sanger sequencing validation, anti-CD46 immunofluorescence to assess acrosome reaction failure","journal":"Molecular genetics & genomic medicine","confidence":"Medium","confidence_rationale":"Tier 2 — human loss-of-function variant with direct functional assay (acrosome reaction immunofluorescence); single case report limits generalizability","pmids":["33350607"],"is_preprint":false},{"year":2025,"finding":"The murine Catsper3 gene has a TATA-less, DPE-independent core promoter located at -157 to +152 relative to the transcription start site, and its transcription is directly regulated by the CRE-binding transcription factors CREMτ and CREBA via two CRE sites located in the +268 to +439 region; both TFs bind these CRE sites in vitro and in vivo specifically in testis.","method":"Promoter deletion analysis with luciferase reporter assays, site-directed mutagenesis of CRE sites and TATA/DPE elements, EMSA (electrophoretic mobility shift assay), ChIP-qPCR in testis and liver","journal":"Biochimica et biophysica acta. Gene regulatory mechanisms","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal methods (reporter assays with deletion/mutagenesis, EMSA, ChIP-qPCR) in a single study establishing transcriptional mechanism","pmids":["40865603"],"is_preprint":false},{"year":2023,"finding":"In the ascidian Ciona intestinalis, CatSper3 knockout spermatozoa show significantly reduced motility and loss of chemotactic behavior, and CatSper protein localizes to sperm flagella, indicating that CatSper3 is required for basic flagellar motility and chemotaxis in this invertebrate ortholog.","method":"CRISPR/Cas9 knockout, sperm motility analysis, immunofluorescence localization of CatSper in sperm flagella","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — KO with defined motility and chemotaxis phenotype, flagellar localization confirmed; invertebrate ortholog consistent with mammalian function","pmids":["38020915"],"is_preprint":false},{"year":2011,"finding":"A heterozygous mutation in CATSPER3 was identified in a patient with asthenozoospermia (reduced sperm motility), with in silico analysis indicating the variant falls in a conserved functional domain, implicating CATSPER3 mutations as a potential genetic cause of human asthenozoospermia.","method":"Candidate gene sequencing, in silico conservation and BLOSUM analysis","journal":"Fertility and sterility","confidence":"Low","confidence_rationale":"Tier 3-4 — single heterozygous variant with computational analysis only; no functional assay performed on the mutant protein","pmids":["21255775"],"is_preprint":false}],"current_model":"CATSPER3 is an essential pore-forming subunit of the heterotetrameric CatSper Ca2+-selective ion channel complex in the sperm flagellum; it is required for the sperm-specific Ca2+ current (ICatSper), sperm hyperactivated motility during capacitation, and the acrosome reaction, and its testis-specific transcription is directly regulated by the CRE-binding factors CREMτ and CREBA through two CRE sites in the gene body."},"narrative":{"teleology":[{"year":2003,"claim":"Identification of CATSPER3 as a candidate sperm channel subunit resolved the question of how many pore-forming units compose the CatSper complex, predicting a heterotetrameric architecture based on conserved pore-loop and coiled-coil domains.","evidence":"In silico gene identification, domain analysis, and RT-PCR showing testis-specific expression","pmids":["12932298"],"confidence":"Medium","gaps":["No functional evidence that CatSper3 assembles into a channel or conducts current","Coiled-coil-mediated interaction with other CatSper subunits not experimentally validated"]},{"year":2007,"claim":"Genetic ablation of CatSper3 in mice proved it is indispensable for the sperm calcium current and hyperactivated motility, establishing that all four CatSper subunits are non-redundant channel components required for male fertility.","evidence":"Two independent mouse knockout studies with patch-clamp electrophysiology, co-immunoprecipitation of all four subunits, motility analysis, and fertility testing","pmids":["17227845","17344468"],"confidence":"High","gaps":["Stoichiometry and structural arrangement of the four subunits within the channel not determined","Whether loss of CatSper3 destabilizes other subunits versus eliminating a pore contribution was not distinguished"]},{"year":2020,"claim":"A human homozygous nonsense mutation in CATSPER3 causing acrosome reaction failure linked the channel to a specific downstream fertilization event beyond motility, extending the phenotypic spectrum of CatSper3 deficiency to humans.","evidence":"Whole-exome sequencing and anti-CD46 immunofluorescence showing acrosome reaction failure in a patient with the p.L236* variant","pmids":["33350607"],"confidence":"Medium","gaps":["Single case report limits generalizability","Whether acrosome reaction failure is a direct effect of lost calcium signaling or secondary to absent hyperactivation was not resolved","No rescue experiment or functional reconstitution performed"]},{"year":2023,"claim":"CatSper3 knockout in the ascidian Ciona demonstrated that flagellar CatSper function is evolutionarily conserved and extends to chemotaxis, broadening the biological roles attributable to the channel beyond mammalian hyperactivation.","evidence":"CRISPR/Cas9 knockout with motility analysis and immunofluorescence localization of CatSper in Ciona sperm flagella","pmids":["38020915"],"confidence":"Medium","gaps":["Whether mammalian CatSper3 similarly contributes to sperm chemotaxis has not been tested","Electrophysiological confirmation of lost calcium current in Ciona KO sperm not performed"]},{"year":2025,"claim":"Characterization of the Catsper3 promoter revealed testis-specific transcriptional control through CREMτ and CREBA at intronic CRE sites, answering how CatSper3 expression is restricted to the male germline.","evidence":"Promoter deletion/mutagenesis luciferase assays, EMSA, and ChIP-qPCR in testis versus liver","pmids":["40865603"],"confidence":"High","gaps":["In vivo validation by CRE-site knock-in mutation to confirm requirement for fertility not performed","Whether the same transcriptional logic governs human CATSPER3 expression is unknown"]},{"year":null,"claim":"The high-resolution structure of the CatSper heterotetrameric complex, the precise stoichiometry and arrangement of CatSper3 relative to other subunits, and the mechanism by which CatSper3-dependent calcium entry triggers the acrosome reaction remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No atomic-resolution structure of the CatSper complex incorporating CatSper3","Mechanism coupling CatSper3-mediated calcium influx to acrosome reaction signaling is undefined","Pharmacological targeting of CatSper3 for contraceptive development lacks structural basis"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,2]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,5]}],"pathway":[{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[0,1,3]}],"complexes":["CatSper channel complex"],"partners":["CATSPER1","CATSPER2","CATSPER4","CREM","CREBA"],"other_free_text":[]},"mechanistic_narrative":"CATSPER3 is an essential pore-forming subunit of the heterotetrameric CatSper calcium-selective channel complex in the sperm flagellum, required for the sperm-specific calcium current (ICatSper), hyperactivated motility during capacitation, and the acrosome reaction. Targeted disruption of CatSper3 in mice abolishes ICatSper and hyperactivated motility, causing complete male infertility without affecting spermatogenesis, and all four CatSper subunits directly interact to form the functional channel [PMID:17227845, PMID:17344468]. In humans, a homozygous loss-of-function mutation in CATSPER3 causes male infertility characterized by failure of the acrosome reaction [PMID:33350607]. Testis-specific transcription of Catsper3 is driven by a TATA-less core promoter and directly regulated by CREMτ and CREBA binding to two CRE sites within the gene body [PMID:40865603]."},"prefetch_data":{"uniprot":{"accession":"Q86XQ3","full_name":"Cation channel sperm-associated protein 3","aliases":["Ca(v)-like protein","One-repeat calcium channel-like protein"],"length_aa":398,"mass_kda":46.4,"function":"Pore-forming subunit of the CatSper complex, a sperm-specific voltage-gated calcium channel that plays a central role in calcium-dependent physiological responses essential for successful fertilization, such as sperm hyperactivation, acrosome reaction and chemotaxis towards the oocyte","subcellular_location":"Cell projection, cilium, flagellum membrane","url":"https://www.uniprot.org/uniprotkb/Q86XQ3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CATSPER3","classification":"Not Classified","n_dependent_lines":10,"n_total_lines":1208,"dependency_fraction":0.008278145695364239},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CATSPER3","total_profiled":1310},"omim":[{"mim_id":"613452","title":"CATION CHANNEL, SPERM-ASSOCIATED, AUXILIARY SUBUNIT GAMMA; CATSPERG","url":"https://www.omim.org/entry/613452"},{"mim_id":"611169","title":"CATION CHANNEL, SPERM-ASSOCIATED, AUXILIARY SUBUNIT BETA; CATSPERB","url":"https://www.omim.org/entry/611169"},{"mim_id":"609121","title":"CATION CHANNEL, SPERM-ASSOCIATED, 4; CATSPER4","url":"https://www.omim.org/entry/609121"},{"mim_id":"609120","title":"CATION CHANNEL, SPERM-ASSOCIATED, 3; CATSPER3","url":"https://www.omim.org/entry/609120"},{"mim_id":"607249","title":"CATION CHANNEL, SPERM-ASSOCIATED, 2; CATSPER2","url":"https://www.omim.org/entry/607249"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Mid piece","reliability":"Enhanced"},{"location":"Principal piece","reliability":"Enhanced"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"testis","ntpm":28.0}],"url":"https://www.proteinatlas.org/search/CATSPER3"},"hgnc":{"alias_symbol":["CACRC"],"prev_symbol":[]},"alphafold":{"accession":"Q86XQ3","domains":[{"cath_id":"1.20.120.350","chopping":"38-160","consensus_level":"high","plddt":84.8615,"start":38,"end":160},{"cath_id":"1.10.287.70","chopping":"170-285","consensus_level":"high","plddt":90.8481,"start":170,"end":285}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q86XQ3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q86XQ3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q86XQ3-F1-predicted_aligned_error_v6.png","plddt_mean":79.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CATSPER3","jax_strain_url":"https://www.jax.org/strain/search?query=CATSPER3"},"sequence":{"accession":"Q86XQ3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q86XQ3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q86XQ3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q86XQ3"}},"corpus_meta":[{"pmid":"17227845","id":"PMC_17227845","title":"All four CatSper ion channel proteins are required for male fertility and sperm cell hyperactivated motility.","date":"2007","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/17227845","citation_count":410,"is_preprint":false},{"pmid":"17344468","id":"PMC_17344468","title":"Catsper3 and Catsper4 are essential for sperm hyperactivated motility and male fertility in the mouse.","date":"2007","source":"Biology of reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/17344468","citation_count":145,"is_preprint":false},{"pmid":"29991641","id":"PMC_29991641","title":"Evolutionary history of human colitis-associated colorectal cancer.","date":"2018","source":"Gut","url":"https://pubmed.ncbi.nlm.nih.gov/29991641","citation_count":135,"is_preprint":false},{"pmid":"12932298","id":"PMC_12932298","title":"Identification of human and mouse CatSper3 and CatSper4 genes: characterisation of a common interaction domain and evidence for expression in testis.","date":"2003","source":"Reproductive biology and endocrinology : RB&E","url":"https://pubmed.ncbi.nlm.nih.gov/12932298","citation_count":119,"is_preprint":false},{"pmid":"25457194","id":"PMC_25457194","title":"CatSper channel, sperm function and male fertility.","date":"2014","source":"Reproductive biomedicine online","url":"https://pubmed.ncbi.nlm.nih.gov/25457194","citation_count":96,"is_preprint":false},{"pmid":"17347248","id":"PMC_17347248","title":"Expression of CatSper family transcripts in the mouse testis during post-natal development and human ejaculated spermatozoa: relationship to sperm motility.","date":"2007","source":"Molecular human reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/17347248","citation_count":69,"is_preprint":false},{"pmid":"24766737","id":"PMC_24766737","title":"ShaoYao decoction ameliorates colitis-associated colorectal cancer by downregulating proinflammatory cytokines and promoting epithelial-mesenchymal transition.","date":"2014","source":"Journal of translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/24766737","citation_count":59,"is_preprint":false},{"pmid":"21822822","id":"PMC_21822822","title":"Inflammatory bowel disease and colon cancer.","date":"2011","source":"Recent results in cancer research. 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Gene regulatory mechanisms","url":"https://pubmed.ncbi.nlm.nih.gov/40865603","citation_count":1,"is_preprint":false},{"pmid":"41114102","id":"PMC_41114102","title":"Ulcerative colitis and colorectal cancer: Pathogenic insights and precision strategies for prevention and treatment.","date":"2025","source":"World journal of gastrointestinal oncology","url":"https://pubmed.ncbi.nlm.nih.gov/41114102","citation_count":1,"is_preprint":false},{"pmid":"38082190","id":"PMC_38082190","title":"New gold(III) complexes TGS 121, 404, and 702 show anti-tumor activity in colitis-induced colorectal cancer: an in vitro and in vivo study.","date":"2023","source":"Pharmacological reports : PR","url":"https://pubmed.ncbi.nlm.nih.gov/38082190","citation_count":1,"is_preprint":false},{"pmid":"36472830","id":"PMC_36472830","title":"In Silico Analysis of CatSper Family Genes and APOB Gene Regulation in Male Infertility.","date":"2022","source":"Advances in experimental medicine and biology","url":"https://pubmed.ncbi.nlm.nih.gov/36472830","citation_count":1,"is_preprint":false},{"pmid":"40898687","id":"PMC_40898687","title":"CFAP300 loss-of-function variant causes primary ciliary dyskinesia and male infertility via disrupting sperm flagellar assembly and acrosome formation.","date":"2025","source":"Asian journal of andrology","url":"https://pubmed.ncbi.nlm.nih.gov/40898687","citation_count":1,"is_preprint":false},{"pmid":"41253134","id":"PMC_41253134","title":"Platelet-rich plasma strategy against freezing damage in ram spermatozoa: its effect on miRNA, ion channels, growth factors, lipids and oxidative stress.","date":"2025","source":"Reproduction, fertility, and development","url":"https://pubmed.ncbi.nlm.nih.gov/41253134","citation_count":1,"is_preprint":false},{"pmid":"40458692","id":"PMC_40458692","title":"Cellular Heterogeneity and IL-17 Pathway Dynamics Reveal Insights into the Transition from Ulcerative Colitis to Colorectal Cancer Through scRNA-Seq Analysis.","date":"2025","source":"Journal of inflammation research","url":"https://pubmed.ncbi.nlm.nih.gov/40458692","citation_count":0,"is_preprint":false},{"pmid":"41091413","id":"PMC_41091413","title":"Synthesis and evaluation of KR-12, an LL-37 fragment, and its short-chain fatty acid derivatives: selective cytotoxicity in colorectal cancer cells and anti-tumor efficacy in an azoxymethane/DSS-induced colitis-associated cancer mouse model.","date":"2025","source":"Pharmacological reports : PR","url":"https://pubmed.ncbi.nlm.nih.gov/41091413","citation_count":0,"is_preprint":false},{"pmid":"41762345","id":"PMC_41762345","title":"Intraepididymal platelet-rich plasma improves semen cryoresistance via antioxidant, lipid and molecular modulation during the non-breeding season in rams.","date":"2026","source":"Veterinary research communications","url":"https://pubmed.ncbi.nlm.nih.gov/41762345","citation_count":0,"is_preprint":false},{"pmid":"41898800","id":"PMC_41898800","title":"The Expression of Kisspeptin Receptor, Catsper 3 and Acrosome Integrity in Oligozoospermic and Normozoospermic Individuals.","date":"2026","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/41898800","citation_count":0,"is_preprint":false},{"pmid":"41850444","id":"PMC_41850444","title":"Benzo[a]pyrene lowers the sperm quality in male rats by downregulating the expression of ZMYND15 and ZMYND10.","date":"2026","source":"Reproductive toxicology (Elmsford, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/41850444","citation_count":0,"is_preprint":false},{"pmid":"42006844","id":"PMC_42006844","title":"The Role of Nuclear APOBEC Enzymes in Neoplastic Progression of Ulcerative Colitis.","date":"2026","source":"Clinical and experimental gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/42006844","citation_count":0,"is_preprint":false},{"pmid":"26979842","id":"PMC_26979842","title":"Mapping hyper-susceptibility to colitis-associated colorectal cancer in FVB/NJ mice.","date":"2016","source":"Mammalian genome : official journal of the International Mammalian Genome Society","url":"https://pubmed.ncbi.nlm.nih.gov/26979842","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":28680,"output_tokens":1778,"usd":0.056355},"stage2":{"model":"claude-opus-4-6","input_tokens":5040,"output_tokens":1656,"usd":0.0999},"total_usd":0.156255,"stage1_batch_id":"msgbatch_011kfMfE81o6CTcyhVUqumuW","stage2_batch_id":"msgbatch_01DTputS6WNkH745x1nVSoBo","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"Targeted disruption of murine CatSper3 abrogates the sperm-specific Ca2+-selective current (ICatSper), sperm hyperactivated motility, and male fertility without affecting spermatogenesis or initial motility. Direct protein interactions among all four CatSper subunits were demonstrated, indicating CatSper3 is an essential component of the heterotetrameric CatSper channel complex in the sperm flagellum.\",\n      \"method\": \"Targeted gene knockout in mice, patch-clamp electrophysiology (ICatSper recording), co-immunoprecipitation to demonstrate direct protein interactions, sperm motility analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — genetic KO with defined electrophysiological readout (loss of ICatSper) plus reciprocal protein interaction data; replicated in a second independent study (PMID:17344468)\",\n      \"pmids\": [\"17227845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CatSper3 knockout male mice are completely infertile due to rapid loss of motility and absence of hyperactivated motility under capacitating conditions, confirming that CATSPER3 is required for sperm hyperactivation during capacitation.\",\n      \"method\": \"Targeted gene knockout in mice, sperm motility analysis under capacitating and non-capacitating conditions, fertility testing\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — independent KO study replicating the hyperactivation/infertility phenotype with defined cellular readout\",\n      \"pmids\": [\"17344468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CatSper3 contains a single channel-forming domain with the consensus pore-loop sequence TxDxW and a C-terminal coiled-coil protein-protein interaction domain conserved across all four CatSper proteins, supporting the hypothesis that CatSper1-4 form a functional heterotetrameric channel in sperm.\",\n      \"method\": \"In silico gene identification, sequence analysis, domain prediction (coiled-coil prediction), RT-PCR for testis-specific expression\",\n      \"journal\": \"Reproductive biology and endocrinology : RB&E\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — computational domain identification with expression data; coiled-coil interaction domain prediction later supported by functional KO studies\",\n      \"pmids\": [\"12932298\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"A homozygous loss-of-function mutation in human CATSPER3 (p.L236*) causes male infertility characterized by failure of sperm acrosome reaction without defects in routine semen parameters, establishing a direct role for CATSPER3 in the acrosome reaction in human sperm.\",\n      \"method\": \"Whole-exome sequencing, Sanger sequencing validation, anti-CD46 immunofluorescence to assess acrosome reaction failure\",\n      \"journal\": \"Molecular genetics & genomic medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — human loss-of-function variant with direct functional assay (acrosome reaction immunofluorescence); single case report limits generalizability\",\n      \"pmids\": [\"33350607\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The murine Catsper3 gene has a TATA-less, DPE-independent core promoter located at -157 to +152 relative to the transcription start site, and its transcription is directly regulated by the CRE-binding transcription factors CREMτ and CREBA via two CRE sites located in the +268 to +439 region; both TFs bind these CRE sites in vitro and in vivo specifically in testis.\",\n      \"method\": \"Promoter deletion analysis with luciferase reporter assays, site-directed mutagenesis of CRE sites and TATA/DPE elements, EMSA (electrophoretic mobility shift assay), ChIP-qPCR in testis and liver\",\n      \"journal\": \"Biochimica et biophysica acta. Gene regulatory mechanisms\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal methods (reporter assays with deletion/mutagenesis, EMSA, ChIP-qPCR) in a single study establishing transcriptional mechanism\",\n      \"pmids\": [\"40865603\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In the ascidian Ciona intestinalis, CatSper3 knockout spermatozoa show significantly reduced motility and loss of chemotactic behavior, and CatSper protein localizes to sperm flagella, indicating that CatSper3 is required for basic flagellar motility and chemotaxis in this invertebrate ortholog.\",\n      \"method\": \"CRISPR/Cas9 knockout, sperm motility analysis, immunofluorescence localization of CatSper in sperm flagella\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO with defined motility and chemotaxis phenotype, flagellar localization confirmed; invertebrate ortholog consistent with mammalian function\",\n      \"pmids\": [\"38020915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"A heterozygous mutation in CATSPER3 was identified in a patient with asthenozoospermia (reduced sperm motility), with in silico analysis indicating the variant falls in a conserved functional domain, implicating CATSPER3 mutations as a potential genetic cause of human asthenozoospermia.\",\n      \"method\": \"Candidate gene sequencing, in silico conservation and BLOSUM analysis\",\n      \"journal\": \"Fertility and sterility\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3-4 — single heterozygous variant with computational analysis only; no functional assay performed on the mutant protein\",\n      \"pmids\": [\"21255775\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CATSPER3 is an essential pore-forming subunit of the heterotetrameric CatSper Ca2+-selective ion channel complex in the sperm flagellum; it is required for the sperm-specific Ca2+ current (ICatSper), sperm hyperactivated motility during capacitation, and the acrosome reaction, and its testis-specific transcription is directly regulated by the CRE-binding factors CREMτ and CREBA through two CRE sites in the gene body.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CATSPER3 is an essential pore-forming subunit of the heterotetrameric CatSper calcium-selective channel complex in the sperm flagellum, required for the sperm-specific calcium current (ICatSper), hyperactivated motility during capacitation, and the acrosome reaction. Targeted disruption of CatSper3 in mice abolishes ICatSper and hyperactivated motility, causing complete male infertility without affecting spermatogenesis, and all four CatSper subunits directly interact to form the functional channel [PMID:17227845, PMID:17344468]. In humans, a homozygous loss-of-function mutation in CATSPER3 causes male infertility characterized by failure of the acrosome reaction [PMID:33350607]. Testis-specific transcription of Catsper3 is driven by a TATA-less core promoter and directly regulated by CREMτ and CREBA binding to two CRE sites within the gene body [PMID:40865603].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Identification of CATSPER3 as a candidate sperm channel subunit resolved the question of how many pore-forming units compose the CatSper complex, predicting a heterotetrameric architecture based on conserved pore-loop and coiled-coil domains.\",\n      \"evidence\": \"In silico gene identification, domain analysis, and RT-PCR showing testis-specific expression\",\n      \"pmids\": [\"12932298\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No functional evidence that CatSper3 assembles into a channel or conducts current\",\n        \"Coiled-coil-mediated interaction with other CatSper subunits not experimentally validated\"\n      ]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Genetic ablation of CatSper3 in mice proved it is indispensable for the sperm calcium current and hyperactivated motility, establishing that all four CatSper subunits are non-redundant channel components required for male fertility.\",\n      \"evidence\": \"Two independent mouse knockout studies with patch-clamp electrophysiology, co-immunoprecipitation of all four subunits, motility analysis, and fertility testing\",\n      \"pmids\": [\"17227845\", \"17344468\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Stoichiometry and structural arrangement of the four subunits within the channel not determined\",\n        \"Whether loss of CatSper3 destabilizes other subunits versus eliminating a pore contribution was not distinguished\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"A human homozygous nonsense mutation in CATSPER3 causing acrosome reaction failure linked the channel to a specific downstream fertilization event beyond motility, extending the phenotypic spectrum of CatSper3 deficiency to humans.\",\n      \"evidence\": \"Whole-exome sequencing and anti-CD46 immunofluorescence showing acrosome reaction failure in a patient with the p.L236* variant\",\n      \"pmids\": [\"33350607\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single case report limits generalizability\",\n        \"Whether acrosome reaction failure is a direct effect of lost calcium signaling or secondary to absent hyperactivation was not resolved\",\n        \"No rescue experiment or functional reconstitution performed\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"CatSper3 knockout in the ascidian Ciona demonstrated that flagellar CatSper function is evolutionarily conserved and extends to chemotaxis, broadening the biological roles attributable to the channel beyond mammalian hyperactivation.\",\n      \"evidence\": \"CRISPR/Cas9 knockout with motility analysis and immunofluorescence localization of CatSper in Ciona sperm flagella\",\n      \"pmids\": [\"38020915\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether mammalian CatSper3 similarly contributes to sperm chemotaxis has not been tested\",\n        \"Electrophysiological confirmation of lost calcium current in Ciona KO sperm not performed\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Characterization of the Catsper3 promoter revealed testis-specific transcriptional control through CREMτ and CREBA at intronic CRE sites, answering how CatSper3 expression is restricted to the male germline.\",\n      \"evidence\": \"Promoter deletion/mutagenesis luciferase assays, EMSA, and ChIP-qPCR in testis versus liver\",\n      \"pmids\": [\"40865603\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"In vivo validation by CRE-site knock-in mutation to confirm requirement for fertility not performed\",\n        \"Whether the same transcriptional logic governs human CATSPER3 expression is unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The high-resolution structure of the CatSper heterotetrameric complex, the precise stoichiometry and arrangement of CatSper3 relative to other subunits, and the mechanism by which CatSper3-dependent calcium entry triggers the acrosome reaction remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No atomic-resolution structure of the CatSper complex incorporating CatSper3\",\n        \"Mechanism coupling CatSper3-mediated calcium influx to acrosome reaction signaling is undefined\",\n        \"Pharmacological targeting of CatSper3 for contraceptive development lacks structural basis\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [0, 1, 3]}\n    ],\n    \"complexes\": [\n      \"CatSper channel complex\"\n    ],\n    \"partners\": [\n      \"CATSPER1\",\n      \"CATSPER2\",\n      \"CATSPER4\",\n      \"CREM\",\n      \"CREBA\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}