{"gene":"CATSPER3","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":2007,"finding":"Targeted disruption of murine CatSper3 abrogated the sperm-specific alkalinization-activated voltage-sensitive 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 a required component of the CatSper channel complex in sperm flagella.","method":"Gene knockout (targeted disruption), electrophysiology (patch clamp of ICatSper), sperm motility assay, co-immunoprecipitation (direct protein interactions among CatSpers)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genetic KO with defined electrophysiological and motility phenotype, protein interaction data, replicated across four CatSper KO lines in the same study","pmids":["17227845"],"is_preprint":false},{"year":2007,"finding":"CatSper3 knockout male mice are completely infertile; sperm show rapid loss of motility and lack of hyperactivated motility specifically under capacitating conditions, establishing that CATSPER3 is required for capacitation-dependent sperm hyperactivation.","method":"Gene knockout (homologous recombination), sperm motility analysis under capacitating vs. non-capacitating conditions, fertility assays","journal":"Biology of reproduction","confidence":"High","confidence_rationale":"Tier 2 / Strong — independent KO study replicating PMID:17227845 with capacitation-specific motility analysis","pmids":["17344468"],"is_preprint":false},{"year":2003,"finding":"In silico identification and sequence analysis revealed that CatSper3 encodes a single channel-forming domain with a predicted pore-loop (consensus TxDxW) and a C-terminal coiled-coil domain shared with CatSper1, 2, and 4, consistent with heterotetramer assembly. Expression was confirmed in testis.","method":"In silico gene prediction, sequence/domain analysis, RT-PCR expression analysis in testis","journal":"Reproductive biology and endocrinology : RB&E","confidence":"Low","confidence_rationale":"Tier 4 / Weak — primarily computational domain prediction with RT-PCR expression; no functional reconstitution or mutagenesis performed","pmids":["12932298"],"is_preprint":false},{"year":2020,"finding":"A homozygous loss-of-function mutation in CATSPER3 (p.L236*) was identified in an infertile man with failure of sperm acrosome reaction (AR) but normal routine semen parameters, establishing that CATSPER3 is required for the acrosome reaction in human sperm.","method":"Whole-exome sequencing, Sanger sequencing validation, anti-CD46 immunofluorescence assay for acrosome reaction","journal":"Molecular genetics & genomic medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — single patient, direct functional assay (acrosome reaction) linked to homozygous loss-of-function variant, single lab","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 TSS. Transcription factors CREMτ and CREBA directly bind two CRE sites within the +268 to +439 region to transactivate Catsper3 expression; mutation of both CRE sites abolishes this transactivation. In vivo ChIP-qPCR confirmed enrichment of CREBA and CREMτ at the Catsper3 promoter in testis but not liver, demonstrating tissue-specific transcriptional regulation.","method":"Promoter deletion analysis (luciferase reporter), site-directed mutagenesis of TATA box, DPE, and CRE sites, EMSA (in vitro binding), ChIP-qPCR (in vivo binding in testis vs. liver)","journal":"Biochimica et biophysica acta. Gene regulatory mechanisms","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal methods (deletion analysis, mutagenesis, EMSA, ChIP-qPCR) in a single rigorous study establishing promoter architecture and transcription factor identity","pmids":["40865603"],"is_preprint":false},{"year":2023,"finding":"In the ascidian Ciona intestinalis, CatSper3 KO spermatozoa showed significantly reduced motility and loss of chemotactic behavior, demonstrating that CatSper3 contributes to basic flagellar motility and chemotaxis in non-mammalian species, and that CatSper3 protein localizes to sperm flagella.","method":"CRISPR/KO gene disruption, sperm motility analysis, chemotaxis assay, localization by immunostaining","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO with defined motility and chemotaxis phenotype plus localization; invertebrate ortholog, single lab","pmids":["38020915"],"is_preprint":false}],"current_model":"CATSPER3 is an essential pore-forming subunit of the tetrameric CatSper Ca2+-selective channel in sperm flagella; it is required for the ICatSper current, capacitation-dependent sperm hyperactivation, and the acrosome reaction, and its testis-specific transcription is directly regulated by the CRE-binding factors CREMτ and CREBA acting at two CRE sites in its promoter."},"narrative":{"mechanistic_narrative":"CATSPER3 is an essential pore-forming subunit of the sperm-specific CatSper Ca2+-selective channel that drives the flagellar Ca2+ entry underlying capacitation-dependent hyperactivated motility and male fertility [PMID:17227845, PMID:17344468]. It assembles into a heterotetrameric channel through direct interactions with CatSper1, 2, and 4, contributing one channel-forming domain with a pore-loop and a C-terminal coiled-coil [PMID:17227845]. Targeted disruption in mice abolishes the alkalinization-activated voltage-sensitive ICatSper current and hyperactivated motility specifically under capacitating conditions, rendering males completely infertile while leaving spermatogenesis and initial motility intact [PMID:17227845, PMID:17344468]. In humans, a homozygous loss-of-function variant (p.L236*) causes infertility through failure of the sperm acrosome reaction with otherwise normal semen parameters, establishing a Mendelian link to the channel's downstream role in Ca2+-dependent sperm function [PMID:33350607]. Testis-specific transcription of Catsper3 is driven by a TATA-less, DPE-independent core promoter at which the CRE-binding factors CREMτ and CREBA bind two CRE sites to transactivate expression in a tissue-restricted manner [PMID:40865603]. The channel function is conserved beyond mammals, with the ascidian ortholog localizing to sperm flagella and supporting basic motility and chemotaxis [PMID:38020915].","teleology":[{"year":2003,"claim":"Before functional study, it was unknown whether CatSper3 had the architecture of a channel subunit; sequence analysis established it as a candidate pore-forming member of the CatSper family.","evidence":"In silico gene prediction, domain analysis, and RT-PCR in testis","pmids":["12932298"],"confidence":"Low","gaps":["Computational prediction only — no functional reconstitution or mutagenesis","Pore-loop and coiled-coil assignments inferred from consensus motifs, not tested","No demonstration of channel activity or assembly"]},{"year":2007,"claim":"It was unknown whether CatSper3 was a functional channel component; knockout demonstrated it is required for the ICatSper current, hyperactivated motility, and fertility, and that it physically assembles with the other three CatSper subunits.","evidence":"Targeted gene knockout in mouse, patch-clamp electrophysiology of ICatSper, sperm motility assays, and co-immunoprecipitation of all four CatSper subunits","pmids":["17227845"],"confidence":"High","gaps":["Did not resolve the stoichiometry or structure of the assembled channel","Did not define how CatSper3 contributes to ion selectivity versus other subunits","Acrosome reaction not assessed"]},{"year":2007,"claim":"An independent knockout established that the motility defect is specific to capacitating conditions, defining CATSPER3 as essential for capacitation-dependent hyperactivation.","evidence":"Independent mouse knockout with motility analysis under capacitating vs. non-capacitating conditions and fertility assays","pmids":["17344468"],"confidence":"High","gaps":["Did not address upstream signals coupling capacitation to channel activation","No human relevance established in this study"]},{"year":2023,"claim":"The conservation and breadth of CatSper3 function were unclear; ascidian knockout showed the ortholog localizes to the flagellum and supports basic motility and chemotaxis, indicating a deeply conserved flagellar role.","evidence":"CRISPR knockout, motility and chemotaxis assays, and immunostaining localization in Ciona intestinalis","pmids":["38020915"],"confidence":"Medium","gaps":["Invertebrate ortholog, single lab — mammalian chemotaxis role not directly tested","No electrophysiological confirmation of channel activity in this system"]},{"year":2020,"claim":"Human relevance was unestablished; a homozygous loss-of-function variant in an infertile man linked CATSPER3 to failure of the acrosome reaction, extending its required role to human sperm function.","evidence":"Whole-exome and Sanger sequencing with anti-CD46 immunofluorescence acrosome reaction assay in one patient","pmids":["33350607"],"confidence":"Medium","gaps":["Single patient, single lab — not replicated across an infertile cohort","No rescue or functional reconstitution of the variant","Mechanism linking the channel to the acrosome reaction not resolved"]},{"year":2025,"claim":"How testis-restricted expression of Catsper3 is achieved was unknown; promoter dissection identified the core promoter architecture and the CRE-binding factors CREMτ and CREBA as direct transactivators acting at two CRE sites.","evidence":"Luciferase promoter deletion, site-directed mutagenesis, EMSA, and ChIP-qPCR in testis versus liver in mouse","pmids":["40865603"],"confidence":"High","gaps":["Did not establish how CREMτ/CREBA activity is itself restricted to germ cells","Human promoter regulation not addressed","Other potential regulatory elements outside the analyzed region not excluded"]},{"year":null,"claim":"The structural basis of how CatSper3 contributes to pore formation, ion selectivity, and subunit arrangement within the assembled channel remains undefined.","evidence":"","pmids":[],"confidence":"High","gaps":["No high-resolution structure of the CatSper complex with defined CatSper3 placement","Distinct functional contribution of CatSper3 versus other subunits unresolved","Molecular link between Ca2+ entry and the acrosome reaction not mechanistically defined"]}],"mechanism_profile":{"molecular_activity":[],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[5]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[0,1]}],"complexes":["CatSper channel"],"partners":["CATSPER1","CATSPER2","CATSPER4","CREM","CREBA"],"other_free_text":[]}},"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":412,"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":138,"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":61,"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":"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":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":"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":"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":"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},{"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}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":29439,"output_tokens":1620,"usd":0.056308,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8378,"output_tokens":2420,"usd":0.051195,"stage2_stop_reason":"end_turn"},"total_usd":0.107503,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"Targeted disruption of murine CatSper3 abrogated the sperm-specific alkalinization-activated voltage-sensitive 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 a required component of the CatSper channel complex in sperm flagella.\",\n      \"method\": \"Gene knockout (targeted disruption), electrophysiology (patch clamp of ICatSper), sperm motility assay, co-immunoprecipitation (direct protein interactions among CatSpers)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genetic KO with defined electrophysiological and motility phenotype, protein interaction data, replicated across four CatSper KO lines in the same study\",\n      \"pmids\": [\"17227845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CatSper3 knockout male mice are completely infertile; sperm show rapid loss of motility and lack of hyperactivated motility specifically under capacitating conditions, establishing that CATSPER3 is required for capacitation-dependent sperm hyperactivation.\",\n      \"method\": \"Gene knockout (homologous recombination), sperm motility analysis under capacitating vs. non-capacitating conditions, fertility assays\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — independent KO study replicating PMID:17227845 with capacitation-specific motility analysis\",\n      \"pmids\": [\"17344468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"In silico identification and sequence analysis revealed that CatSper3 encodes a single channel-forming domain with a predicted pore-loop (consensus TxDxW) and a C-terminal coiled-coil domain shared with CatSper1, 2, and 4, consistent with heterotetramer assembly. Expression was confirmed in testis.\",\n      \"method\": \"In silico gene prediction, sequence/domain analysis, RT-PCR expression analysis in testis\",\n      \"journal\": \"Reproductive biology and endocrinology : RB&E\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — primarily computational domain prediction with RT-PCR expression; no functional reconstitution or mutagenesis performed\",\n      \"pmids\": [\"12932298\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"A homozygous loss-of-function mutation in CATSPER3 (p.L236*) was identified in an infertile man with failure of sperm acrosome reaction (AR) but normal routine semen parameters, establishing that CATSPER3 is required for the acrosome reaction in human sperm.\",\n      \"method\": \"Whole-exome sequencing, Sanger sequencing validation, anti-CD46 immunofluorescence assay for acrosome reaction\",\n      \"journal\": \"Molecular genetics & genomic medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — single patient, direct functional assay (acrosome reaction) linked to homozygous loss-of-function variant, single lab\",\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 TSS. Transcription factors CREMτ and CREBA directly bind two CRE sites within the +268 to +439 region to transactivate Catsper3 expression; mutation of both CRE sites abolishes this transactivation. In vivo ChIP-qPCR confirmed enrichment of CREBA and CREMτ at the Catsper3 promoter in testis but not liver, demonstrating tissue-specific transcriptional regulation.\",\n      \"method\": \"Promoter deletion analysis (luciferase reporter), site-directed mutagenesis of TATA box, DPE, and CRE sites, EMSA (in vitro binding), ChIP-qPCR (in vivo binding in testis vs. liver)\",\n      \"journal\": \"Biochimica et biophysica acta. Gene regulatory mechanisms\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal methods (deletion analysis, mutagenesis, EMSA, ChIP-qPCR) in a single rigorous study establishing promoter architecture and transcription factor identity\",\n      \"pmids\": [\"40865603\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In the ascidian Ciona intestinalis, CatSper3 KO spermatozoa showed significantly reduced motility and loss of chemotactic behavior, demonstrating that CatSper3 contributes to basic flagellar motility and chemotaxis in non-mammalian species, and that CatSper3 protein localizes to sperm flagella.\",\n      \"method\": \"CRISPR/KO gene disruption, sperm motility analysis, chemotaxis assay, localization by immunostaining\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with defined motility and chemotaxis phenotype plus localization; invertebrate ortholog, single lab\",\n      \"pmids\": [\"38020915\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CATSPER3 is an essential pore-forming subunit of the tetrameric CatSper Ca2+-selective channel in sperm flagella; it is required for the ICatSper current, capacitation-dependent sperm hyperactivation, and the acrosome reaction, and its testis-specific transcription is directly regulated by the CRE-binding factors CREMτ and CREBA acting at two CRE sites in its promoter.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CATSPER3 is an essential pore-forming subunit of the sperm-specific CatSper Ca2+-selective channel that drives the flagellar Ca2+ entry underlying capacitation-dependent hyperactivated motility and male fertility [#0, #1]. It assembles into a heterotetrameric channel through direct interactions with CatSper1, 2, and 4, contributing one channel-forming domain with a pore-loop and a C-terminal coiled-coil [#0]. Targeted disruption in mice abolishes the alkalinization-activated voltage-sensitive ICatSper current and hyperactivated motility specifically under capacitating conditions, rendering males completely infertile while leaving spermatogenesis and initial motility intact [#0, #1]. In humans, a homozygous loss-of-function variant (p.L236*) causes infertility through failure of the sperm acrosome reaction with otherwise normal semen parameters, establishing a Mendelian link to the channel's downstream role in Ca2+-dependent sperm function [#3]. Testis-specific transcription of Catsper3 is driven by a TATA-less, DPE-independent core promoter at which the CRE-binding factors CREM\\u03c4 and CREBA bind two CRE sites to transactivate expression in a tissue-restricted manner [#4]. The channel function is conserved beyond mammals, with the ascidian ortholog localizing to sperm flagella and supporting basic motility and chemotaxis [#5].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Before functional study, it was unknown whether CatSper3 had the architecture of a channel subunit; sequence analysis established it as a candidate pore-forming member of the CatSper family.\",\n      \"evidence\": \"In silico gene prediction, domain analysis, and RT-PCR in testis\",\n      \"pmids\": [\"12932298\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Computational prediction only \\u2014 no functional reconstitution or mutagenesis\", \"Pore-loop and coiled-coil assignments inferred from consensus motifs, not tested\", \"No demonstration of channel activity or assembly\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"It was unknown whether CatSper3 was a functional channel component; knockout demonstrated it is required for the ICatSper current, hyperactivated motility, and fertility, and that it physically assembles with the other three CatSper subunits.\",\n      \"evidence\": \"Targeted gene knockout in mouse, patch-clamp electrophysiology of ICatSper, sperm motility assays, and co-immunoprecipitation of all four CatSper subunits\",\n      \"pmids\": [\"17227845\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the stoichiometry or structure of the assembled channel\", \"Did not define how CatSper3 contributes to ion selectivity versus other subunits\", \"Acrosome reaction not assessed\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"An independent knockout established that the motility defect is specific to capacitating conditions, defining CATSPER3 as essential for capacitation-dependent hyperactivation.\",\n      \"evidence\": \"Independent mouse knockout with motility analysis under capacitating vs. non-capacitating conditions and fertility assays\",\n      \"pmids\": [\"17344468\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address upstream signals coupling capacitation to channel activation\", \"No human relevance established in this study\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"The conservation and breadth of CatSper3 function were unclear; ascidian knockout showed the ortholog localizes to the flagellum and supports basic motility and chemotaxis, indicating a deeply conserved flagellar role.\",\n      \"evidence\": \"CRISPR knockout, motility and chemotaxis assays, and immunostaining localization in Ciona intestinalis\",\n      \"pmids\": [\"38020915\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Invertebrate ortholog, single lab \\u2014 mammalian chemotaxis role not directly tested\", \"No electrophysiological confirmation of channel activity in this system\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Human relevance was unestablished; a homozygous loss-of-function variant in an infertile man linked CATSPER3 to failure of the acrosome reaction, extending its required role to human sperm function.\",\n      \"evidence\": \"Whole-exome and Sanger sequencing with anti-CD46 immunofluorescence acrosome reaction assay in one patient\",\n      \"pmids\": [\"33350607\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single patient, single lab \\u2014 not replicated across an infertile cohort\", \"No rescue or functional reconstitution of the variant\", \"Mechanism linking the channel to the acrosome reaction not resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"How testis-restricted expression of Catsper3 is achieved was unknown; promoter dissection identified the core promoter architecture and the CRE-binding factors CREM\\u03c4 and CREBA as direct transactivators acting at two CRE sites.\",\n      \"evidence\": \"Luciferase promoter deletion, site-directed mutagenesis, EMSA, and ChIP-qPCR in testis versus liver in mouse\",\n      \"pmids\": [\"40865603\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish how CREM\\u03c4/CREBA activity is itself restricted to germ cells\", \"Human promoter regulation not addressed\", \"Other potential regulatory elements outside the analyzed region not excluded\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis of how CatSper3 contributes to pore formation, ion selectivity, and subunit arrangement within the assembled channel remains undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution structure of the CatSper complex with defined CatSper3 placement\", \"Distinct functional contribution of CatSper3 versus other subunits unresolved\", \"Molecular link between Ca2+ entry and the acrosome reaction not mechanistically defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005216\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"complexes\": [\"CatSper channel\"],\n    \"partners\": [\"CATSPER1\", \"CATSPER2\", \"CATSPER4\", \"CREM\", \"CREBA\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}