{"gene":"TTC29","run_date":"2026-04-28T21:43:00","timeline":{"discoveries":[{"year":2019,"finding":"TTC29 is an axonemal protein required for flagellar structure and beating; bi-allelic loss-of-function mutations in humans cause MMAF asthenozoospermia with defects in axonemal and peri-axonemal ultrastructure. In the T. brucei model, TPR structural motifs are critical for TTC29 axonemal localization and flagellar beating. Loss of TTC29 in mice (CRISPR KO) recapitulates reduced sperm motility and abnormal flagellar ultrastructure.","method":"Whole-exome sequencing in human patients, immunofluorescence on patient spermatozoa, T. brucei loss-of-function model with TPR domain mutagenesis, CRISPR-Cas9 mouse KO with ultrastructural analysis","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods across two independent labs and two model organisms, with domain mutagenesis validating mechanism","pmids":["31735292","31735294"],"is_preprint":false},{"year":2019,"finding":"Loss of TTC29 in human spermatozoa causes markedly reduced immunostaining of IFT-complex-B-associated proteins TTC30A and IFT52, indicating TTC29 is required for proper localization or stability of IFT-B components in the flagellum.","method":"Immunofluorescence assay on spermatozoa from men with TTC29 mutations","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 — clean loss-of-function with defined molecular phenotype (IFT-B protein mislocalization), single lab","pmids":["31735294"],"is_preprint":false},{"year":2023,"finding":"TTC29 forms an axonemal complex with ZMYND12 and DNAH1 (inner dynein arm d subunit) that is critical for flagellum assembly and function. Co-immunoprecipitation in T. brucei and comparative proteomics using Ttc29 KO mouse samples identified all three complex members; ultrastructure expansion microscopy confirmed co-localization.","method":"Co-immunoprecipitation in T. brucei, comparative proteomics in Ttc29 KO mice, ultrastructure expansion microscopy, immunofluorescence in human patient sperm","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 — reciprocal Co-IP, mass spectrometry proteomics, and ultrastructural imaging across two model systems","pmids":["37934199"],"is_preprint":false},{"year":2007,"finding":"The mouse homologue of Chlamydomonas p44 (NYD-SP14, later identified as TTC29) is a component of inner-arm dynein d (IDA d), strongly expressed in tissues with motile cilia and flagella; p44/TTC29 and p38 form a complex that likely constitutes the docking site of dynein d on the outer doublet.","method":"Immunoprecipitation from Chlamydomonas axonemes, analysis of ida4 and ida5 mutants, expression analysis of mouse homologue","journal":"Eukaryotic cell","confidence":"Medium","confidence_rationale":"Tier 2 — immunoprecipitation with mutant validation in Chlamydomonas; mouse homologue expression only, not yet functionally validated in mammals at this time","pmids":["17981992"],"is_preprint":false},{"year":2024,"finding":"ZMYND12 interacts with TTC29 (and PRKACA) in mouse sperm, as demonstrated by co-immunoprecipitation and mass spectrometry; loss of ZMYND12 reduces PRKACA levels in sperm, and this loss is associated with reduced flagellar beating and impaired capacitation.","method":"Co-immunoprecipitation and mass spectrometry in Zmynd12 KO mouse sperm","journal":"Cellular and molecular life sciences : CMLS","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP/MS in KO model with defined functional phenotype, single lab","pmids":["39066891"],"is_preprint":false},{"year":2026,"finding":"TTC29 was identified as an interacting protein of ADGB (androglobin) by co-immunoprecipitation in human sperm cells.","method":"Co-immunoprecipitation in human sperm","journal":"Journal of Sichuan University. Medical science edition","confidence":"Low","confidence_rationale":"Tier 3 — single Co-IP, no functional follow-up of the TTC29–ADGB interaction","pmids":["41834962"],"is_preprint":false}],"current_model":"TTC29 is an evolutionarily conserved axonemal tetratricopeptide repeat (TPR) protein that localizes to the flagellum via its TPR motifs, forms a stable complex with ZMYND12 and inner dynein arm heavy chain DNAH1 (IDA d subunit), and is required for proper IFT-B complex localization (TTC30A, IFT52) and flagellar beating; bi-allelic loss-of-function mutations in humans and mice cause MMAF asthenoteratospermia with disorganized axonemal ultrastructure and male infertility."},"narrative":{"teleology":[{"year":2007,"claim":"The identity of a previously unnamed IDA d subunit (p44) as the Chlamydomonas ortholog of TTC29 established that TTC29 is a core inner dynein arm d component and likely participates in docking dynein d to the outer doublet.","evidence":"Immunoprecipitation from Chlamydomonas axonemes with validation in ida4/ida5 mutants; expression analysis of the mouse homologue","pmids":["17981992"],"confidence":"Medium","gaps":["Functional validation in mammalian systems was lacking at this time","Whether TTC29 is required for dynein d assembly versus docking was not resolved","No loss-of-function mammalian model existed"]},{"year":2019,"claim":"Human genetic and multi-organism functional studies demonstrated that TTC29 is required for flagellar structure and motility: bi-allelic mutations cause MMAF asthenozoospermia, TPR motifs are essential for axonemal targeting, and Ttc29 KO mice recapitulate the phenotype, establishing TTC29 as a bona fide ciliopathy gene.","evidence":"Whole-exome sequencing in infertile men, immunofluorescence on patient spermatozoa, T. brucei TPR domain mutagenesis, CRISPR-Cas9 mouse KO with TEM ultrastructure","pmids":["31735292","31735294"],"confidence":"High","gaps":["Direct binding partners within the axoneme were not yet identified in mammals","Mechanism by which TTC29 loss disrupts peri-axonemal structures was unclear"]},{"year":2019,"claim":"Demonstrating that TTC29 loss leads to mislocalization of IFT-B components TTC30A and IFT52 revealed a functional link between TTC29 and intraflagellar transport, extending its role beyond dynein arm assembly.","evidence":"Immunofluorescence on spermatozoa from men carrying TTC29 loss-of-function mutations","pmids":["31735294"],"confidence":"Medium","gaps":["Whether TTC29 directly interacts with IFT-B subunits or affects them indirectly is unknown","Quantitative assessment of IFT cargo transport in TTC29-deficient cells is lacking"]},{"year":2023,"claim":"Identification of a TTC29–ZMYND12–DNAH1 complex by reciprocal co-immunoprecipitation, comparative proteomics, and expansion microscopy defined the molecular architecture of the IDA d docking module across species.","evidence":"Co-IP in T. brucei, comparative proteomics in Ttc29 KO mice, ultrastructure expansion microscopy, immunofluorescence in human patient sperm","pmids":["37934199"],"confidence":"High","gaps":["Structural basis of the TTC29–ZMYND12–DNAH1 interaction (atomic resolution) is unknown","Whether additional accessory subunits participate in complex assembly remains open"]},{"year":2024,"claim":"Discovery that ZMYND12 bridges TTC29 to PRKACA (catalytic PKA subunit) connected the IDA d docking complex to cAMP-dependent signaling and capacitation, suggesting a signaling scaffold function for the TTC29-containing complex.","evidence":"Co-immunoprecipitation and mass spectrometry in Zmynd12 KO mouse sperm","pmids":["39066891"],"confidence":"Medium","gaps":["Whether TTC29 directly contacts PRKACA or acts only through ZMYND12 is unresolved","Phosphorylation targets downstream of PRKACA in this context are unknown","Whether this signaling link is conserved outside rodents is untested"]},{"year":null,"claim":"Key unresolved questions include the structural basis of the TTC29–ZMYND12–DNAH1 complex, the mechanism by which TTC29 influences IFT-B localization, whether TTC29 participates in motile cilia function outside the sperm flagellum, and whether its interaction with PRKACA has direct consequences for axonemal phospho-signaling.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of the TTC29-containing complex exists","Role of TTC29 in non-flagellar motile cilia (e.g., airway, ependymal) has not been characterized","Whether TTC29 is a direct IFT-B interactor or acts indirectly remains unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,2,3]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,1,2,3]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,2,3]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,1,2]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[0,2]}],"complexes":["TTC29–ZMYND12–DNAH1 (IDA d docking complex)"],"partners":["ZMYND12","DNAH1","PRKACA","TTC30A","IFT52"],"other_free_text":[]},"mechanistic_narrative":"TTC29 is an evolutionarily conserved axonemal tetratricopeptide repeat (TPR) protein essential for flagellar assembly, ultrastructure, and motility. It forms a stable complex with ZMYND12 and the inner dynein arm heavy chain DNAH1, constituting a docking module for inner dynein arm d (IDA d) on the outer doublet microtubules [PMID:17981992, PMID:37934199]. TTC29 requires its TPR motifs for axonemal localization and is additionally needed for proper localization of IFT-B complex components (TTC30A, IFT52) within the flagellum [PMID:31735294]. Bi-allelic loss-of-function mutations in TTC29 cause multiple morphological abnormalities of the sperm flagella (MMAF) and male infertility in humans, with the phenotype recapitulated in Ttc29 knockout mice [PMID:31735292, PMID:31735294]."},"prefetch_data":{"uniprot":{"accession":"Q8NA56","full_name":"Tetratricopeptide repeat protein 29","aliases":["Protein TBPP2A","Testis development protein NYD-SP14"],"length_aa":475,"mass_kda":55.1,"function":"Axonemal protein which is implicated in axonemal and/or peri-axonemal structure assembly and regulates flagellum assembly and beating and therefore sperm motility","subcellular_location":"Cytoplasm, cytoskeleton, flagellum axoneme","url":"https://www.uniprot.org/uniprotkb/Q8NA56/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TTC29","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TTC29","total_profiled":1310},"omim":[{"mim_id":"618745","title":"SPERMATOGENIC FAILURE 42; SPGF42","url":"https://www.omim.org/entry/618745"},{"mim_id":"618735","title":"TETRATRICOPEPTIDE REPEAT DOMAIN-CONTAINING PROTEIN 29; TTC29","url":"https://www.omim.org/entry/618735"},{"mim_id":"258150","title":"SPERMATOGENIC FAILURE 1; SPGF1","url":"https://www.omim.org/entry/258150"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Principal piece","reliability":"Supported"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"fallopian tube","ntpm":18.8},{"tissue":"testis","ntpm":67.2}],"url":"https://www.proteinatlas.org/search/TTC29"},"hgnc":{"alias_symbol":["NYD-SP14"],"prev_symbol":[]},"alphafold":{"accession":"Q8NA56","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NA56","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NA56-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NA56-F1-predicted_aligned_error_v6.png","plddt_mean":84.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TTC29","jax_strain_url":"https://www.jax.org/strain/search?query=TTC29"},"sequence":{"accession":"Q8NA56","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8NA56.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8NA56/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NA56"}},"corpus_meta":[{"pmid":"24424412","id":"PMC_24424412","title":"Coordinated genomic control of ciliogenesis and cell movement by RFX2.","date":"2014","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/24424412","citation_count":119,"is_preprint":false},{"pmid":"25250046","id":"PMC_25250046","title":"Genome-wide association and pathway analysis of feed efficiency in pigs reveal candidate genes and pathways for residual feed intake.","date":"2014","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/25250046","citation_count":76,"is_preprint":false},{"pmid":"31735294","id":"PMC_31735294","title":"Bi-allelic Mutations in TTC29 Cause Male Subfertility with Asthenoteratospermia in Humans and Mice.","date":"2019","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/31735294","citation_count":75,"is_preprint":false},{"pmid":"31735292","id":"PMC_31735292","title":"Mutations in TTC29, Encoding an Evolutionarily Conserved Axonemal Protein, Result in Asthenozoospermia and Male Infertility.","date":"2019","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/31735292","citation_count":51,"is_preprint":false},{"pmid":"32034058","id":"PMC_32034058","title":"Integrated characterisation of cancer genes identifies key molecular biomarkers in stomach adenocarcinoma.","date":"2020","source":"Journal of clinical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/32034058","citation_count":34,"is_preprint":false},{"pmid":"17981992","id":"PMC_17981992","title":"Novel 44-kilodalton subunit of axonemal Dynein conserved from chlamydomonas to mammals.","date":"2007","source":"Eukaryotic cell","url":"https://pubmed.ncbi.nlm.nih.gov/17981992","citation_count":30,"is_preprint":false},{"pmid":"37934199","id":"PMC_37934199","title":"Novel axonemal protein ZMYND12 interacts with TTC29 and DNAH1, and is required for male fertility and flagellum function.","date":"2023","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/37934199","citation_count":13,"is_preprint":false},{"pmid":"36346162","id":"PMC_36346162","title":"Novel biallelic mutations in TTC29 cause asthenoteratospermia and male infertility.","date":"2022","source":"Molecular genetics & genomic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/36346162","citation_count":12,"is_preprint":false},{"pmid":"38540412","id":"PMC_38540412","title":"Genome-Wide DNA Methylation Analysis and Functional Validation of Litter Size Traits in Jining Grey Goats.","date":"2024","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/38540412","citation_count":5,"is_preprint":false},{"pmid":"39066891","id":"PMC_39066891","title":"ZMYND12 serves as an IDAd subunit that is essential for sperm motility in mice.","date":"2024","source":"Cellular and molecular life sciences : CMLS","url":"https://pubmed.ncbi.nlm.nih.gov/39066891","citation_count":3,"is_preprint":false},{"pmid":"39774243","id":"PMC_39774243","title":"Genomic evidence of improved fertility and adaptation in Iranian domestic sheep attributed to introgression from Asiatic Mouflon and urial.","date":"2025","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/39774243","citation_count":1,"is_preprint":false},{"pmid":"41834962","id":"PMC_41834962","title":"[Whole Exome Sequencing Identified Novel Pathogenic Mutations of ADGB in Patients With Oligoasthenozoospermia].","date":"2026","source":"Sichuan da xue xue bao. Yi xue ban = Journal of Sichuan University. Medical science edition","url":"https://pubmed.ncbi.nlm.nih.gov/41834962","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":8009,"output_tokens":1520,"usd":0.023414},"stage2":{"model":"claude-opus-4-6","input_tokens":4763,"output_tokens":1842,"usd":0.104798},"total_usd":0.128212,"stage1_batch_id":"msgbatch_01RPbVc9PDH9zQmYK5Hs6srm","stage2_batch_id":"msgbatch_01JVbVLzeKN2yVrsGp3zC8aM","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2019,\n      \"finding\": \"TTC29 is an axonemal protein required for flagellar structure and beating; bi-allelic loss-of-function mutations in humans cause MMAF asthenozoospermia with defects in axonemal and peri-axonemal ultrastructure. In the T. brucei model, TPR structural motifs are critical for TTC29 axonemal localization and flagellar beating. Loss of TTC29 in mice (CRISPR KO) recapitulates reduced sperm motility and abnormal flagellar ultrastructure.\",\n      \"method\": \"Whole-exome sequencing in human patients, immunofluorescence on patient spermatozoa, T. brucei loss-of-function model with TPR domain mutagenesis, CRISPR-Cas9 mouse KO with ultrastructural analysis\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods across two independent labs and two model organisms, with domain mutagenesis validating mechanism\",\n      \"pmids\": [\"31735292\", \"31735294\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Loss of TTC29 in human spermatozoa causes markedly reduced immunostaining of IFT-complex-B-associated proteins TTC30A and IFT52, indicating TTC29 is required for proper localization or stability of IFT-B components in the flagellum.\",\n      \"method\": \"Immunofluorescence assay on spermatozoa from men with TTC29 mutations\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean loss-of-function with defined molecular phenotype (IFT-B protein mislocalization), single lab\",\n      \"pmids\": [\"31735294\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TTC29 forms an axonemal complex with ZMYND12 and DNAH1 (inner dynein arm d subunit) that is critical for flagellum assembly and function. Co-immunoprecipitation in T. brucei and comparative proteomics using Ttc29 KO mouse samples identified all three complex members; ultrastructure expansion microscopy confirmed co-localization.\",\n      \"method\": \"Co-immunoprecipitation in T. brucei, comparative proteomics in Ttc29 KO mice, ultrastructure expansion microscopy, immunofluorescence in human patient sperm\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reciprocal Co-IP, mass spectrometry proteomics, and ultrastructural imaging across two model systems\",\n      \"pmids\": [\"37934199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The mouse homologue of Chlamydomonas p44 (NYD-SP14, later identified as TTC29) is a component of inner-arm dynein d (IDA d), strongly expressed in tissues with motile cilia and flagella; p44/TTC29 and p38 form a complex that likely constitutes the docking site of dynein d on the outer doublet.\",\n      \"method\": \"Immunoprecipitation from Chlamydomonas axonemes, analysis of ida4 and ida5 mutants, expression analysis of mouse homologue\",\n      \"journal\": \"Eukaryotic cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — immunoprecipitation with mutant validation in Chlamydomonas; mouse homologue expression only, not yet functionally validated in mammals at this time\",\n      \"pmids\": [\"17981992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ZMYND12 interacts with TTC29 (and PRKACA) in mouse sperm, as demonstrated by co-immunoprecipitation and mass spectrometry; loss of ZMYND12 reduces PRKACA levels in sperm, and this loss is associated with reduced flagellar beating and impaired capacitation.\",\n      \"method\": \"Co-immunoprecipitation and mass spectrometry in Zmynd12 KO mouse sperm\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP/MS in KO model with defined functional phenotype, single lab\",\n      \"pmids\": [\"39066891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"TTC29 was identified as an interacting protein of ADGB (androglobin) by co-immunoprecipitation in human sperm cells.\",\n      \"method\": \"Co-immunoprecipitation in human sperm\",\n      \"journal\": \"Journal of Sichuan University. Medical science edition\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single Co-IP, no functional follow-up of the TTC29–ADGB interaction\",\n      \"pmids\": [\"41834962\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TTC29 is an evolutionarily conserved axonemal tetratricopeptide repeat (TPR) protein that localizes to the flagellum via its TPR motifs, forms a stable complex with ZMYND12 and inner dynein arm heavy chain DNAH1 (IDA d subunit), and is required for proper IFT-B complex localization (TTC30A, IFT52) and flagellar beating; bi-allelic loss-of-function mutations in humans and mice cause MMAF asthenoteratospermia with disorganized axonemal ultrastructure and male infertility.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TTC29 is an evolutionarily conserved axonemal tetratricopeptide repeat (TPR) protein essential for flagellar assembly, ultrastructure, and motility. It forms a stable complex with ZMYND12 and the inner dynein arm heavy chain DNAH1, constituting a docking module for inner dynein arm d (IDA d) on the outer doublet microtubules [PMID:17981992, PMID:37934199]. TTC29 requires its TPR motifs for axonemal localization and is additionally needed for proper localization of IFT-B complex components (TTC30A, IFT52) within the flagellum [PMID:31735294]. Bi-allelic loss-of-function mutations in TTC29 cause multiple morphological abnormalities of the sperm flagella (MMAF) and male infertility in humans, with the phenotype recapitulated in Ttc29 knockout mice [PMID:31735292, PMID:31735294].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"The identity of a previously unnamed IDA d subunit (p44) as the Chlamydomonas ortholog of TTC29 established that TTC29 is a core inner dynein arm d component and likely participates in docking dynein d to the outer doublet.\",\n      \"evidence\": \"Immunoprecipitation from Chlamydomonas axonemes with validation in ida4/ida5 mutants; expression analysis of the mouse homologue\",\n      \"pmids\": [\"17981992\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Functional validation in mammalian systems was lacking at this time\",\n        \"Whether TTC29 is required for dynein d assembly versus docking was not resolved\",\n        \"No loss-of-function mammalian model existed\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Human genetic and multi-organism functional studies demonstrated that TTC29 is required for flagellar structure and motility: bi-allelic mutations cause MMAF asthenozoospermia, TPR motifs are essential for axonemal targeting, and Ttc29 KO mice recapitulate the phenotype, establishing TTC29 as a bona fide ciliopathy gene.\",\n      \"evidence\": \"Whole-exome sequencing in infertile men, immunofluorescence on patient spermatozoa, T. brucei TPR domain mutagenesis, CRISPR-Cas9 mouse KO with TEM ultrastructure\",\n      \"pmids\": [\"31735292\", \"31735294\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct binding partners within the axoneme were not yet identified in mammals\",\n        \"Mechanism by which TTC29 loss disrupts peri-axonemal structures was unclear\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrating that TTC29 loss leads to mislocalization of IFT-B components TTC30A and IFT52 revealed a functional link between TTC29 and intraflagellar transport, extending its role beyond dynein arm assembly.\",\n      \"evidence\": \"Immunofluorescence on spermatozoa from men carrying TTC29 loss-of-function mutations\",\n      \"pmids\": [\"31735294\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether TTC29 directly interacts with IFT-B subunits or affects them indirectly is unknown\",\n        \"Quantitative assessment of IFT cargo transport in TTC29-deficient cells is lacking\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identification of a TTC29–ZMYND12–DNAH1 complex by reciprocal co-immunoprecipitation, comparative proteomics, and expansion microscopy defined the molecular architecture of the IDA d docking module across species.\",\n      \"evidence\": \"Co-IP in T. brucei, comparative proteomics in Ttc29 KO mice, ultrastructure expansion microscopy, immunofluorescence in human patient sperm\",\n      \"pmids\": [\"37934199\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of the TTC29–ZMYND12–DNAH1 interaction (atomic resolution) is unknown\",\n        \"Whether additional accessory subunits participate in complex assembly remains open\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Discovery that ZMYND12 bridges TTC29 to PRKACA (catalytic PKA subunit) connected the IDA d docking complex to cAMP-dependent signaling and capacitation, suggesting a signaling scaffold function for the TTC29-containing complex.\",\n      \"evidence\": \"Co-immunoprecipitation and mass spectrometry in Zmynd12 KO mouse sperm\",\n      \"pmids\": [\"39066891\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether TTC29 directly contacts PRKACA or acts only through ZMYND12 is unresolved\",\n        \"Phosphorylation targets downstream of PRKACA in this context are unknown\",\n        \"Whether this signaling link is conserved outside rodents is untested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of the TTC29–ZMYND12–DNAH1 complex, the mechanism by which TTC29 influences IFT-B localization, whether TTC29 participates in motile cilia function outside the sperm flagellum, and whether its interaction with PRKACA has direct consequences for axonemal phospho-signaling.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No high-resolution structure of the TTC29-containing complex exists\",\n        \"Role of TTC29 in non-flagellar motile cilia (e.g., airway, ependymal) has not been characterized\",\n        \"Whether TTC29 is a direct IFT-B interactor or acts indirectly remains unresolved\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 2, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 1, 2, 3]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 2, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"complexes\": [\n      \"TTC29–ZMYND12–DNAH1 (IDA d docking complex)\"\n    ],\n    \"partners\": [\n      \"ZMYND12\",\n      \"DNAH1\",\n      \"PRKACA\",\n      \"TTC30A\",\n      \"IFT52\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}