{"gene":"CFAP65","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":2019,"finding":"Biallelic loss-of-function mutations in CFAP65 (nonsense and frameshift) cause multiple morphological abnormalities of the sperm flagella (MMAF) in humans, with a consistent phenotype reproduced in Cfap65 CRISPR-Cas9 frameshift knockout male mice, demonstrating CFAP65 is required for sperm flagellar structure and motility.","method":"Whole-exome sequencing in human MMAF patients, Sanger sequencing validation, CRISPR-Cas9 mouse knockout with sperm morphology and motility phenotyping","journal":"Journal of medical genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple independent human families plus mouse KO, replicated across two independent studies in the same journal issue","pmids":["31501240","31413122"],"is_preprint":false},{"year":2019,"finding":"CFAP65 mutations cause severe asthenoteratospermia characterized by acrosome hypoplasia, disruption of the mitochondrial sheath, and absence of the central pair complex in sperm flagella, as demonstrated by ultrastructural (electron microscopy) and immunostaining analyses of patient spermatozoa.","method":"Transmission electron microscopy and immunofluorescence staining of patient spermatozoa","journal":"Journal of medical genetics","confidence":"High","confidence_rationale":"Tier 2 — direct ultrastructural characterization in human patient samples, consistent across two independent studies","pmids":["31413122","31571197"],"is_preprint":false},{"year":2021,"finding":"CFAP65 is required for acrosome biogenesis in the maturation phase and mitochondrial sheath assembly during spermiogenesis; Cfap65-knockout male mice show hyper-constricted sperm heads from step 9 spermatids onward, accompanied by abnormal manchette development and disrupted flagellar elongation.","method":"Cfap65 knockout mouse model, histology, electron microscopy, immunostaining of spermatids at defined developmental steps","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined cellular phenotypes at multiple spermiogenic stages, orthogonal methods","pmids":["34231842"],"is_preprint":false},{"year":2021,"finding":"CFAP65 forms a cytoplasmic protein network with MNS1, RSPH1, TPPP2, ZPBP1, and SPACA1, as revealed by endogenous co-immunoprecipitation and immunostaining in mouse testes.","method":"Endogenous immunoprecipitation, immunostaining in mouse testes","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, co-IP with immunostaining but no reciprocal pulldown or structural validation","pmids":["34231842"],"is_preprint":false},{"year":2021,"finding":"Proteomic analysis of Cfap65-knockout testes revealed disruption of the proteostatic system during acrosome formation, manchette organization, and mitochondrial sheath assembly, placing CFAP65 upstream of these spermiogenic processes.","method":"Quantitative proteomics (mass spectrometry) of Cfap65-/- versus wild-type mouse testes","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — proteomics in KO model, single lab, no independent replication","pmids":["34231842"],"is_preprint":false},{"year":2021,"finding":"In Chlamydomonas reinhardtii, FAP65 (ortholog of human CFAP65) localizes exclusively to the central apparatus (C2a projection) of the axoneme; fap70-1 mutant axonemes lacking FAP70 also lack FAP65 and FAP147, and FAP65 co-immunoprecipitates with HA-tagged FAP70, identifying FAP65 as a component of the C2a central apparatus projection.","method":"Super-resolution structured illumination microscopy, cryo-electron microscopy, mass spectrometry of axonemes from fap70-1 mutants, co-immunoprecipitation with HA-tagged FAP70","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structural localization plus co-IP and MS in a single study with rigorous controls","pmids":["33988244"],"is_preprint":false},{"year":2024,"finding":"MYCBPAP interactome analysis in transgenic mice with tagged MYCBPAP identified CFAP65 (along with CFAP70) as a binding partner, consistent with their co-localization in the C2a central apparatus projection of the sperm flagellar axoneme.","method":"Endogenous immunoprecipitation combined with mass spectrometry in MYCBPAP transgenic mouse testes","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 — interactome MS in transgenic mouse model, single lab, consistent with Chlamydomonas structural data","pmids":["39092789","39704931"],"is_preprint":false},{"year":2017,"finding":"In human gastric cancer cells, CFAP65 acts downstream of mitochondrial DNA/TFAM signaling and upstream of PCK1 in a calcium-mediated retrograde signaling axis (TFAM-mtDNA-calcium-CFAP65-PCK1) that affects cell morphology and proliferation; knockdown of CFAP65 rescued the morphological and proliferative effects of TFAM depletion.","method":"siRNA knockdown of CFAP65 in MKN45 cells, cell morphology and proliferation assays, epistasis ordering by sequential knockdown","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis ordering by knockdown rescue, single lab, non-germline cellular context distinct from canonical CFAP65 function","pmids":["29259235"],"is_preprint":false},{"year":2023,"finding":"CFAP47 physically interacts with CFAP65 (and CFAP69 and SEPTIN4), and CFAP47 missense mutations in infertile men lead to markedly reduced CFAP65 protein levels in spermatozoa, suggesting CFAP47 regulates CFAP65 stability or expression during sperm morphogenesis.","method":"Co-immunoprecipitation (physical interaction), western blotting and immunofluorescence of patient spermatozoa","journal":"Frontiers in endocrinology","confidence":"Low","confidence_rationale":"Tier 3 — single co-IP, single lab, mechanistic interpretation based on protein level changes only","pmids":["37424856"],"is_preprint":false},{"year":2021,"finding":"CFAP65 protein is expressed at all levels of mouse germ cells during spermatogenesis, as shown by cellular immunofluorescence assay in mouse testes, indicating a role throughout spermatogenic development rather than only at a specific step.","method":"Immunofluorescence staining of mouse testis sections","journal":"Zhonghua nan ke xue = National journal of andrology","confidence":"Low","confidence_rationale":"Tier 3 — single localization experiment, no functional consequence directly demonstrated","pmids":["34914225"],"is_preprint":false}],"current_model":"CFAP65 is a conserved cilia and flagella-associated protein that localizes to the C2a projection of the axonemal central apparatus (established by cryo-EM in Chlamydomonas), where it forms a complex with FAP70/CFAP70 and FAP147/MYCBPAP; in mammals, CFAP65 is essential for spermiogenesis — specifically for acrosome biogenesis, manchette-guided sperm head shaping, and mitochondrial sheath assembly — through a cytoplasmic protein network including MNS1, RSPH1, TPPP2, ZPBP1, and SPACA1, and biallelic loss-of-function mutations cause complete sperm immotility with multiple morphological abnormalities of the flagella (MMAF) in humans and mice."},"narrative":{"teleology":[{"year":2017,"claim":"Before CFAP65 was linked to spermatogenesis, an epistasis experiment in gastric cancer cells placed it in a mitochondrial retrograde signaling axis (TFAM→mtDNA→calcium→CFAP65→PCK1), revealing a non-ciliary context for the gene.","evidence":"siRNA knockdown and epistasis ordering in MKN45 gastric cancer cells","pmids":["29259235"],"confidence":"Medium","gaps":["Single cell line; relevance to physiological CFAP65 function in germ cells or motile cilia unclear","Downstream mechanism linking CFAP65 to PCK1 regulation not defined","No independent replication in a second cancer model"]},{"year":2019,"claim":"The first genetic evidence that CFAP65 is essential for sperm structure and motility came from identification of biallelic loss-of-function mutations in MMAF patients and recapitulation by CRISPR-Cas9 knockout in mice, establishing CFAP65 as a male infertility gene.","evidence":"Whole-exome sequencing in multiple MMAF families, Sanger validation, CRISPR-Cas9 Cfap65 KO mouse with sperm phenotyping, transmission electron microscopy of patient spermatozoa","pmids":["31501240","31413122","31571197"],"confidence":"High","gaps":["Molecular function of CFAP65 protein was unknown","Sub-cellular localization within the flagellar axoneme was not determined","Mechanism linking CFAP65 loss to simultaneous acrosome, mitochondrial sheath, and central pair defects was not explained"]},{"year":2021,"claim":"Cryo-EM and mutant analysis in Chlamydomonas resolved the structural position of FAP65/CFAP65 to the C2a projection of the central apparatus and showed it depends on FAP70 for incorporation, defining its precise axonemal sub-localization.","evidence":"Cryo-electron microscopy, super-resolution SIM, mass spectrometry of fap70-1 mutant axonemes, co-immunoprecipitation with HA-FAP70 in Chlamydomonas","pmids":["33988244"],"confidence":"High","gaps":["Whether mammalian CFAP65 occupies the identical C2a niche was not directly shown structurally","Direct structural model of the FAP65-FAP70-FAP147 complex at atomic resolution was not obtained"]},{"year":2021,"claim":"Detailed mouse knockout analysis revealed that CFAP65 acts at defined spermiogenic stages — required for acrosome maturation from step 9 onward, manchette organization, and mitochondrial sheath assembly — and identified a cytoplasmic interaction network (MNS1, RSPH1, TPPP2, ZPBP1, SPACA1) through which it operates.","evidence":"Cfap65 KO mouse, step-resolved histology and EM of spermatids, endogenous co-immunoprecipitation, quantitative proteomics","pmids":["34231842"],"confidence":"High","gaps":["Co-IP interactions lack reciprocal pulldown or structural validation","How CFAP65 coordinates distinct processes (acrosome, manchette, mitochondrial sheath) mechanistically remains unclear","Proteomics-inferred pathway disruption needs functional validation of individual downstream targets"]},{"year":2023,"claim":"CFAP47 was identified as a physical interactor of CFAP65, and CFAP47 mutations led to reduced CFAP65 protein in patient sperm, suggesting an upstream stability-regulatory relationship.","evidence":"Co-immunoprecipitation and western blot/immunofluorescence in patient spermatozoa","pmids":["37424856"],"confidence":"Low","gaps":["Single co-IP without reciprocal validation; interaction directness not confirmed","Mechanism of CFAP47-dependent CFAP65 stabilization not determined","Only protein-level correlation, not causation, demonstrated for the stability claim"]},{"year":2024,"claim":"MYCBPAP interactome analysis in mouse testes independently confirmed CFAP65 and CFAP70 as binding partners, corroborating the conserved C2a complex from Chlamydomonas in the mammalian sperm flagellum.","evidence":"Endogenous immunoprecipitation–mass spectrometry from MYCBPAP transgenic mouse testes","pmids":["39092789","39704931"],"confidence":"Medium","gaps":["No direct structural data confirming mammalian C2a complex architecture","Functional consequence of disrupting the CFAP65-MYCBPAP interaction specifically is untested"]},{"year":null,"claim":"The direct biochemical activity of CFAP65 — whether it is a structural scaffold, an enzymatic factor, or a regulatory adaptor within the C2a projection and cytoplasmic spermiogenic network — remains undefined.","evidence":"","pmids":[],"confidence":"Low","gaps":["No enzymatic or biochemical activity assigned to CFAP65","Atomic-resolution structure of CFAP65 alone or in complex is unavailable","Whether CFAP65 has motile-cilia functions beyond spermatogenesis (e.g. in airway epithelia) is untested in mammalian models"]}],"mechanism_profile":{"molecular_activity":[],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,1,5,6]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3,4]}],"pathway":[{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[0,1,2,4]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[2,5]}],"complexes":["C2a central apparatus projection (FAP65-FAP70-FAP147/MYCBPAP)"],"partners":["CFAP70","MYCBPAP","MNS1","RSPH1","TPPP2","ZPBP1","SPACA1","CFAP47"],"other_free_text":[]},"mechanistic_narrative":"CFAP65 is a cilia- and flagella-associated protein essential for spermiogenesis, sperm flagellar assembly, and axonemal central apparatus integrity. In the axoneme, CFAP65 localizes to the C2a projection of the central apparatus, where it forms a complex with FAP70/CFAP70 and FAP147/MYCBPAP [PMID:33988244, PMID:39092789]. During mammalian spermiogenesis, CFAP65 is required for acrosome biogenesis, manchette-guided sperm head shaping, and mitochondrial sheath assembly, functioning through a cytoplasmic protein network that includes MNS1, RSPH1, TPPP2, ZPBP1, and SPACA1 [PMID:34231842]. Biallelic loss-of-function mutations in CFAP65 cause multiple morphological abnormalities of the sperm flagella (MMAF) and male infertility in humans and mice [PMID:31501240, PMID:31413122]."},"prefetch_data":{"uniprot":{"accession":"Q6ZU64","full_name":"Cilia- and flagella-associated protein 65","aliases":["Coiled-coil domain-containing protein 108"],"length_aa":1925,"mass_kda":217.2,"function":"Plays a role in flagellar formation and sperm motility (PubMed:33472045). Essential for acrosome formation, manchette organization, spermatid head morphogenesis and mitochondrial sheath assembly within the sperm flagellum during spermiogenesis (By similarity). Also required for proper assembly and stabilization of the C2a projection, a structural subunit of the central pair apparatus within the axoneme of motile cilia and flagella (By similarity)","subcellular_location":"Cell projection, cilium, flagellum membrane; Cytoplasmic vesicle, secretory vesicle, acrosome membrane; Cytoplasm; Cell projection, cilium, flagellum; Cytoplasm, cytoskeleton, cilium axoneme; Cytoplasm, cytoskeleton, flagellum axoneme","url":"https://www.uniprot.org/uniprotkb/Q6ZU64/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CFAP65","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CFAP65","total_profiled":1310},"omim":[{"mim_id":"618664","title":"SPERMATOGENIC FAILURE 40; SPGF40","url":"https://www.omim.org/entry/618664"},{"mim_id":"617593","title":"SPERMATOGENIC FAILURE 20; SPGF20","url":"https://www.omim.org/entry/617593"},{"mim_id":"617592","title":"SPERMATOGENIC FAILURE 19; SPGF19","url":"https://www.omim.org/entry/617592"},{"mim_id":"614270","title":"CILIA- AND FLAGELLA-ASSOCIATED PROTEIN 65; CFAP65","url":"https://www.omim.org/entry/614270"},{"mim_id":"301057","title":"CILIA- AND FLAGELLA-ASSOCIATED PROTEIN 47; CFAP47","url":"https://www.omim.org/entry/301057"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"choroid plexus","ntpm":8.9},{"tissue":"fallopian tube","ntpm":24.2},{"tissue":"retina","ntpm":8.5},{"tissue":"testis","ntpm":8.8}],"url":"https://www.proteinatlas.org/search/CFAP65"},"hgnc":{"alias_symbol":["DKFZp434O0527","MGC35338"],"prev_symbol":["CCDC108"]},"alphafold":{"accession":"Q6ZU64","domains":[{"cath_id":"2.60.40.10","chopping":"140-238","consensus_level":"high","plddt":82.33,"start":140,"end":238},{"cath_id":"2.60.40.10","chopping":"245-341","consensus_level":"high","plddt":87.8153,"start":245,"end":341},{"cath_id":"2.60.40.10","chopping":"344-462","consensus_level":"medium","plddt":79.1051,"start":344,"end":462},{"cath_id":"2.60.40.10","chopping":"573-605_641-771","consensus_level":"medium","plddt":88.0728,"start":573,"end":771},{"cath_id":"2.60.40.10","chopping":"774-875","consensus_level":"medium","plddt":86.8066,"start":774,"end":875},{"cath_id":"2.60.40.10","chopping":"878-990","consensus_level":"medium","plddt":83.2768,"start":878,"end":990},{"cath_id":"2.60.40.10","chopping":"994-1105","consensus_level":"high","plddt":82.4606,"start":994,"end":1105},{"cath_id":"2.60.40.10","chopping":"1110-1212_1225-1292","consensus_level":"medium","plddt":82.5379,"start":1110,"end":1292},{"cath_id":"2.60.40.10","chopping":"1429-1543_1607-1640","consensus_level":"medium","plddt":79.1266,"start":1429,"end":1640}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6ZU64","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q6ZU64-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q6ZU64-F1-predicted_aligned_error_v6.png","plddt_mean":70.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CFAP65","jax_strain_url":"https://www.jax.org/strain/search?query=CFAP65"},"sequence":{"accession":"Q6ZU64","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6ZU64.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6ZU64/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6ZU64"}},"corpus_meta":[{"pmid":"28552195","id":"PMC_28552195","title":"Biallelic Mutations in CFAP43 and CFAP44 Cause Male Infertility with Multiple Morphological Abnormalities of the Sperm Flagella.","date":"2017","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/28552195","citation_count":225,"is_preprint":false},{"pmid":"33472045","id":"PMC_33472045","title":"Deleterious variants in X-linked CFAP47 induce asthenoteratozoospermia and primary male infertility.","date":"2021","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/33472045","citation_count":102,"is_preprint":false},{"pmid":"22761584","id":"PMC_22761584","title":"The Rose-comb mutation in chickens constitutes a structural rearrangement causing both altered comb morphology and defective sperm motility.","date":"2012","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/22761584","citation_count":97,"is_preprint":false},{"pmid":"31413122","id":"PMC_31413122","title":"Biallelic mutations in CFAP65 lead to severe 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Cfap65-knockout male mice show hyper-constricted sperm heads from step 9 spermatids onward, accompanied by abnormal manchette development and disrupted flagellar elongation.\",\n      \"method\": \"Cfap65 knockout mouse model, histology, electron microscopy, immunostaining of spermatids at defined developmental steps\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotypes at multiple spermiogenic stages, orthogonal methods\",\n      \"pmids\": [\"34231842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CFAP65 forms a cytoplasmic protein network with MNS1, RSPH1, TPPP2, ZPBP1, and SPACA1, as revealed by endogenous co-immunoprecipitation and immunostaining in mouse testes.\",\n      \"method\": \"Endogenous immunoprecipitation, immunostaining in mouse testes\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, co-IP with immunostaining but no reciprocal pulldown or structural validation\",\n      \"pmids\": [\"34231842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Proteomic analysis of Cfap65-knockout testes revealed disruption of the proteostatic system during acrosome formation, manchette organization, and mitochondrial sheath assembly, placing CFAP65 upstream of these spermiogenic processes.\",\n      \"method\": \"Quantitative proteomics (mass spectrometry) of Cfap65-/- versus wild-type mouse testes\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — proteomics in KO model, single lab, no independent replication\",\n      \"pmids\": [\"34231842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In Chlamydomonas reinhardtii, FAP65 (ortholog of human CFAP65) localizes exclusively to the central apparatus (C2a projection) of the axoneme; fap70-1 mutant axonemes lacking FAP70 also lack FAP65 and FAP147, and FAP65 co-immunoprecipitates with HA-tagged FAP70, identifying FAP65 as a component of the C2a central apparatus projection.\",\n      \"method\": \"Super-resolution structured illumination microscopy, cryo-electron microscopy, mass spectrometry of axonemes from fap70-1 mutants, co-immunoprecipitation with HA-tagged FAP70\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structural localization plus co-IP and MS in a single study with rigorous controls\",\n      \"pmids\": [\"33988244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MYCBPAP interactome analysis in transgenic mice with tagged MYCBPAP identified CFAP65 (along with CFAP70) as a binding partner, consistent with their co-localization in the C2a central apparatus projection of the sperm flagellar axoneme.\",\n      \"method\": \"Endogenous immunoprecipitation combined with mass spectrometry in MYCBPAP transgenic mouse testes\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — interactome MS in transgenic mouse model, single lab, consistent with Chlamydomonas structural data\",\n      \"pmids\": [\"39092789\", \"39704931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In human gastric cancer cells, CFAP65 acts downstream of mitochondrial DNA/TFAM signaling and upstream of PCK1 in a calcium-mediated retrograde signaling axis (TFAM-mtDNA-calcium-CFAP65-PCK1) that affects cell morphology and proliferation; knockdown of CFAP65 rescued the morphological and proliferative effects of TFAM depletion.\",\n      \"method\": \"siRNA knockdown of CFAP65 in MKN45 cells, cell morphology and proliferation assays, epistasis ordering by sequential knockdown\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis ordering by knockdown rescue, single lab, non-germline cellular context distinct from canonical CFAP65 function\",\n      \"pmids\": [\"29259235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CFAP47 physically interacts with CFAP65 (and CFAP69 and SEPTIN4), and CFAP47 missense mutations in infertile men lead to markedly reduced CFAP65 protein levels in spermatozoa, suggesting CFAP47 regulates CFAP65 stability or expression during sperm morphogenesis.\",\n      \"method\": \"Co-immunoprecipitation (physical interaction), western blotting and immunofluorescence of patient spermatozoa\",\n      \"journal\": \"Frontiers in endocrinology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single co-IP, single lab, mechanistic interpretation based on protein level changes only\",\n      \"pmids\": [\"37424856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CFAP65 protein is expressed at all levels of mouse germ cells during spermatogenesis, as shown by cellular immunofluorescence assay in mouse testes, indicating a role throughout spermatogenic development rather than only at a specific step.\",\n      \"method\": \"Immunofluorescence staining of mouse testis sections\",\n      \"journal\": \"Zhonghua nan ke xue = National journal of andrology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single localization experiment, no functional consequence directly demonstrated\",\n      \"pmids\": [\"34914225\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CFAP65 is a conserved cilia and flagella-associated protein that localizes to the C2a projection of the axonemal central apparatus (established by cryo-EM in Chlamydomonas), where it forms a complex with FAP70/CFAP70 and FAP147/MYCBPAP; in mammals, CFAP65 is essential for spermiogenesis — specifically for acrosome biogenesis, manchette-guided sperm head shaping, and mitochondrial sheath assembly — through a cytoplasmic protein network including MNS1, RSPH1, TPPP2, ZPBP1, and SPACA1, and biallelic loss-of-function mutations cause complete sperm immotility with multiple morphological abnormalities of the flagella (MMAF) in humans and mice.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CFAP65 is a cilia- and flagella-associated protein essential for spermiogenesis, sperm flagellar assembly, and axonemal central apparatus integrity. In the axoneme, CFAP65 localizes to the C2a projection of the central apparatus, where it forms a complex with FAP70/CFAP70 and FAP147/MYCBPAP [PMID:33988244, PMID:39092789]. During mammalian spermiogenesis, CFAP65 is required for acrosome biogenesis, manchette-guided sperm head shaping, and mitochondrial sheath assembly, functioning through a cytoplasmic protein network that includes MNS1, RSPH1, TPPP2, ZPBP1, and SPACA1 [PMID:34231842]. Biallelic loss-of-function mutations in CFAP65 cause multiple morphological abnormalities of the sperm flagella (MMAF) and male infertility in humans and mice [PMID:31501240, PMID:31413122].\",\n  \"teleology\": [\n    {\n      \"year\": 2017,\n      \"claim\": \"Before CFAP65 was linked to spermatogenesis, an epistasis experiment in gastric cancer cells placed it in a mitochondrial retrograde signaling axis (TFAM→mtDNA→calcium→CFAP65→PCK1), revealing a non-ciliary context for the gene.\",\n      \"evidence\": \"siRNA knockdown and epistasis ordering in MKN45 gastric cancer cells\",\n      \"pmids\": [\"29259235\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single cell line; relevance to physiological CFAP65 function in germ cells or motile cilia unclear\",\n        \"Downstream mechanism linking CFAP65 to PCK1 regulation not defined\",\n        \"No independent replication in a second cancer model\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"The first genetic evidence that CFAP65 is essential for sperm structure and motility came from identification of biallelic loss-of-function mutations in MMAF patients and recapitulation by CRISPR-Cas9 knockout in mice, establishing CFAP65 as a male infertility gene.\",\n      \"evidence\": \"Whole-exome sequencing in multiple MMAF families, Sanger validation, CRISPR-Cas9 Cfap65 KO mouse with sperm phenotyping, transmission electron microscopy of patient spermatozoa\",\n      \"pmids\": [\"31501240\", \"31413122\", \"31571197\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular function of CFAP65 protein was unknown\",\n        \"Sub-cellular localization within the flagellar axoneme was not determined\",\n        \"Mechanism linking CFAP65 loss to simultaneous acrosome, mitochondrial sheath, and central pair defects was not explained\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Cryo-EM and mutant analysis in Chlamydomonas resolved the structural position of FAP65/CFAP65 to the C2a projection of the central apparatus and showed it depends on FAP70 for incorporation, defining its precise axonemal sub-localization.\",\n      \"evidence\": \"Cryo-electron microscopy, super-resolution SIM, mass spectrometry of fap70-1 mutant axonemes, co-immunoprecipitation with HA-FAP70 in Chlamydomonas\",\n      \"pmids\": [\"33988244\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether mammalian CFAP65 occupies the identical C2a niche was not directly shown structurally\",\n        \"Direct structural model of the FAP65-FAP70-FAP147 complex at atomic resolution was not obtained\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Detailed mouse knockout analysis revealed that CFAP65 acts at defined spermiogenic stages — required for acrosome maturation from step 9 onward, manchette organization, and mitochondrial sheath assembly — and identified a cytoplasmic interaction network (MNS1, RSPH1, TPPP2, ZPBP1, SPACA1) through which it operates.\",\n      \"evidence\": \"Cfap65 KO mouse, step-resolved histology and EM of spermatids, endogenous co-immunoprecipitation, quantitative proteomics\",\n      \"pmids\": [\"34231842\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Co-IP interactions lack reciprocal pulldown or structural validation\",\n        \"How CFAP65 coordinates distinct processes (acrosome, manchette, mitochondrial sheath) mechanistically remains unclear\",\n        \"Proteomics-inferred pathway disruption needs functional validation of individual downstream targets\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"CFAP47 was identified as a physical interactor of CFAP65, and CFAP47 mutations led to reduced CFAP65 protein in patient sperm, suggesting an upstream stability-regulatory relationship.\",\n      \"evidence\": \"Co-immunoprecipitation and western blot/immunofluorescence in patient spermatozoa\",\n      \"pmids\": [\"37424856\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Single co-IP without reciprocal validation; interaction directness not confirmed\",\n        \"Mechanism of CFAP47-dependent CFAP65 stabilization not determined\",\n        \"Only protein-level correlation, not causation, demonstrated for the stability claim\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"MYCBPAP interactome analysis in mouse testes independently confirmed CFAP65 and CFAP70 as binding partners, corroborating the conserved C2a complex from Chlamydomonas in the mammalian sperm flagellum.\",\n      \"evidence\": \"Endogenous immunoprecipitation–mass spectrometry from MYCBPAP transgenic mouse testes\",\n      \"pmids\": [\"39092789\", \"39704931\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No direct structural data confirming mammalian C2a complex architecture\",\n        \"Functional consequence of disrupting the CFAP65-MYCBPAP interaction specifically is untested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The direct biochemical activity of CFAP65 — whether it is a structural scaffold, an enzymatic factor, or a regulatory adaptor within the C2a projection and cytoplasmic spermiogenic network — remains undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No enzymatic or biochemical activity assigned to CFAP65\",\n        \"Atomic-resolution structure of CFAP65 alone or in complex is unavailable\",\n        \"Whether CFAP65 has motile-cilia functions beyond spermatogenesis (e.g. in airway epithelia) is untested in mammalian models\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 1, 5, 6]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [0, 1, 2, 4]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [2, 5]}\n    ],\n    \"complexes\": [\n      \"C2a central apparatus projection (FAP65-FAP70-FAP147/MYCBPAP)\"\n    ],\n    \"partners\": [\n      \"CFAP70\",\n      \"MYCBPAP\",\n      \"MNS1\",\n      \"RSPH1\",\n      \"TPPP2\",\n      \"ZPBP1\",\n      \"SPACA1\",\n      \"CFAP47\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}