{"gene":"TTC29","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":2007,"finding":"TTC29 (mouse homologue NYD-SP14) was identified as a component of inner-arm dynein d (IDA d) in Chlamydomonas axonemes; the p44 protein (TTC29 ortholog) is present along axoneme length and forms a complex with p38, suggesting they constitute the docking site of dynein d on the outer doublet microtubule.","method":"Immunoprecipitation from Chlamydomonas axonemes; analysis of ida4 and ida5 mutants lacking dynein d; expression profiling of mouse NYD-SP14 in ciliated tissues","journal":"Eukaryotic cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal immunoprecipitation in Chlamydomonas with mutant analysis; mouse ortholog expression confirmed but functional validation limited to expression data","pmids":["17981992"],"is_preprint":false},{"year":2019,"finding":"Bi-allelic truncating mutations in TTC29 cause MMAF (multiple morphological abnormalities of flagella) in humans and mice. Loss of TTC29 results in dramatically reduced staining of IFT-B complex proteins TTC30A and IFT52 in sperm flagella, placing TTC29 upstream of or required for IFT-B complex assembly/localization in the flagellum.","method":"Whole-exome sequencing in human MMAF patients; immunofluorescence of patient spermatozoa; CRISPR-Cas9 Ttc29 knockout mouse model with sperm motility and ultrastructure analysis (TEM)","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — human genetic data replicated in mouse KO model, immunofluorescence showing IFT-B reduction, ultrastructural analysis; independently replicated in a second concurrent paper (PMID:31735292)","pmids":["31735294"],"is_preprint":false},{"year":2019,"finding":"TTC29 is an evolutionarily conserved axonemal protein required for flagellar beating. In T. brucei, the TPR (tetratricopeptide repeat) structural motifs of TTC29 are critical for its axonemal localization; loss-of-function in T. brucei abolishes flagellar beating. Loss-of-function in mice similarly impairs flagellar structure and beating.","method":"Loss-of-function models in T. brucei (flagellated protist) and M. musculus; site-directed analysis of TPR motifs for axonemal localization; confirmation of splicing variant effect on transcript and protein","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent model organisms (T. brucei and mouse KO), mutagenesis of TPR motifs for localization, replicated across labs concurrently with PMID:31735294","pmids":["31735292"],"is_preprint":false},{"year":2023,"finding":"TTC29 forms an axonemal complex with ZMYND12 and DNAH1. In T. brucei, co-immunoprecipitation and ultrastructure expansion microscopy showed TbTAX-1 (ZMYND12 ortholog) forms a complex with TTC29. Comparative proteomics using Ttc29 KO mouse samples identified DNAH1 as a third member of this complex. Loss of ZMYND12 causes altered localization of TTC29 in human sperm.","method":"Co-immunoprecipitation in T. brucei; ultrastructure expansion microscopy; comparative proteomics (Ttc29 KO mice vs. controls); immunofluorescence of patient spermatozoa","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, orthogonal ultrastructure microscopy, comparative proteomics across two model systems identifying the same complex members","pmids":["37934199"],"is_preprint":false},{"year":2024,"finding":"ZMYND12 interacts with TTC29 and PRKACA in sperm flagella. In Zmynd12 knockout mice, PRKACA levels in sperm are reduced, linking the TTC29-ZMYND12 axonemal complex to the cAMP/PKA signaling pathway relevant for capacitation and flagellar motility.","method":"Co-immunoprecipitation and mass spectrometry in Zmynd12-/- mouse sperm; CRISPR/Cas9 knockout mouse model; western blotting for PRKACA levels","journal":"Cellular and molecular life sciences : CMLS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with mass spectrometry in KO mouse model; single lab study linking TTC29-containing complex to PRKACA","pmids":["39066891"],"is_preprint":false},{"year":2026,"finding":"TTC29 was identified as an interacting protein of androglobin (ADGB) in human sperm by co-immunoprecipitation, expanding TTC29's known protein interaction network in the sperm flagellum.","method":"Co-immunoprecipitation validated by STRING database screening","journal":"Journal of Sichuan University. Medical science edition","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP experiment, single lab, no functional follow-up for the TTC29-ADGB interaction specifically","pmids":["41834962"],"is_preprint":false}],"current_model":"TTC29 is an evolutionarily conserved axonemal tetratricopeptide repeat (TPR) protein that functions as a subunit of inner dynein arm d (IDAd); its TPR motifs are required for axonemal localization, and it forms a stable complex with ZMYND12 and DNAH1 that is critical for flagellar beating—loss of TTC29 disrupts IFT-B complex (TTC30A, IFT52) localization in the flagellum and causes the MMAF (multiple morphological abnormalities of flagella) phenotype and male infertility in both humans and mice."},"narrative":{"mechanistic_narrative":"TTC29 is an evolutionarily conserved axonemal tetratricopeptide repeat (TPR) protein that functions as a component of inner-arm dynein d (IDAd) and is required for flagellar beating [PMID:17981992, PMID:31735292]. First characterized in Chlamydomonas as the p44 subunit that forms a complex with p38 at the dynein d docking site on the outer doublet microtubule [PMID:17981992], TTC29 depends on its TPR structural motifs for axonemal localization, and its loss abolishes flagellar beating in T. brucei and impairs flagellar structure and motility in mice [PMID:31735292]. Within the axoneme, TTC29 forms a stable complex with ZMYND12 and DNAH1; ZMYND12 is required for correct TTC29 localization in human sperm, and the complex is further linked to cAMP/PKA signaling through PRKACA [PMID:37934199, PMID:39066891]. Loss of TTC29 reduces axonemal localization of IFT-B complex proteins TTC30A and IFT52 [PMID:31735294]. Bi-allelic truncating mutations in TTC29 cause multiple morphological abnormalities of the flagella (MMAF) and male infertility in humans, a phenotype recapitulated in Ttc29 knockout mice [PMID:31735294, PMID:31735292].","teleology":[{"year":2007,"claim":"Established TTC29's identity as an axonemal protein by placing its Chlamydomonas ortholog p44 within inner-arm dynein d, addressing where this conserved TPR protein acts in the cilium/flagellum.","evidence":"Immunoprecipitation from Chlamydomonas axonemes with ida4/ida5 mutant analysis; mouse ortholog expression profiling","pmids":["17981992"],"confidence":"Medium","gaps":["Functional role of the mammalian ortholog inferred only from expression, not tested","Molecular nature of the p44-p38 docking interaction not resolved","No structural model of dynein d docking"]},{"year":2019,"claim":"Demonstrated that TTC29 loss causes MMAF and male infertility and is required for axonemal IFT-B protein localization, connecting the gene to a human disease and a flagellar assembly defect.","evidence":"Whole-exome sequencing in MMAF patients, patient sperm immunofluorescence, and CRISPR Ttc29 knockout mouse with TEM ultrastructure","pmids":["31735294"],"confidence":"High","gaps":["Mechanism by which TTC29 controls IFT-B localization not defined","Whether the IFT-B defect is direct or secondary to axonemal disruption unknown"]},{"year":2019,"claim":"Showed the TPR motifs are required for axonemal targeting and that the beating defect is conserved across distant species, establishing TTC29 as a conserved beating factor and defining its localization determinant.","evidence":"Loss-of-function in T. brucei and mouse with site-directed analysis of TPR motifs","pmids":["31735292"],"confidence":"High","gaps":["Binding partners contacted by the TPR motifs at the axoneme not identified at this stage","How TPR-dependent localization couples to beating mechanics unclear"]},{"year":2023,"claim":"Identified the TTC29 axonemal complex as containing ZMYND12 and DNAH1, defining its direct molecular partners and the hierarchy of localization within the complex.","evidence":"Co-immunoprecipitation in T. brucei, ultrastructure expansion microscopy, comparative proteomics in Ttc29 KO mice, and patient sperm immunofluorescence","pmids":["37934199"],"confidence":"High","gaps":["Stoichiometry and architecture of the TTC29-ZMYND12-DNAH1 complex not resolved","Direct versus indirect nature of the DNAH1 association not fully distinguished"]},{"year":2024,"claim":"Linked the TTC29-ZMYND12 complex to cAMP/PKA signaling via PRKACA, suggesting a route by which the axonemal complex influences motility-related signaling.","evidence":"Co-immunoprecipitation/mass spectrometry and PRKACA western blotting in Zmynd12 knockout mouse sperm","pmids":["39066891"],"confidence":"Medium","gaps":["Functional consequence of reduced PRKACA for capacitation not directly tested","Single-lab study","Whether TTC29 itself contacts PRKACA unresolved"]},{"year":2026,"claim":"Expanded the TTC29 interaction network by detecting androglobin (ADGB) as a flagellar binding partner.","evidence":"Co-immunoprecipitation validated by STRING screening in human sperm","pmids":["41834962"],"confidence":"Low","gaps":["Single Co-IP without reciprocal validation or functional follow-up","Biological significance of the TTC29-ADGB interaction unknown"]},{"year":null,"claim":"How TTC29-dependent assembly of inner dynein arm d mechanically drives flagellar beating, and how the complex coordinates IFT-B localization and PKA signaling, remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No high-resolution structure of the TTC29 complex within the axoneme","Causal chain from TTC29 loss to IFT-B mislocalization undefined","Direct enzymatic or signaling activity of TTC29 unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,2]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,2,3]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[1,2]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[1]}],"complexes":["inner-arm dynein d (IDAd)","TTC29-ZMYND12-DNAH1 axonemal complex"],"partners":["ZMYND12","DNAH1","PRKACA","ADGB","TTC30A","IFT52"],"other_free_text":[]}},"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":121,"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":14,"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":13,"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":2,"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":8766,"output_tokens":1714,"usd":0.026004,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8478,"output_tokens":2376,"usd":0.050895,"stage2_stop_reason":"end_turn"},"total_usd":0.076899,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"TTC29 (mouse homologue NYD-SP14) was identified as a component of inner-arm dynein d (IDA d) in Chlamydomonas axonemes; the p44 protein (TTC29 ortholog) is present along axoneme length and forms a complex with p38, suggesting they constitute the docking site of dynein d on the outer doublet microtubule.\",\n      \"method\": \"Immunoprecipitation from Chlamydomonas axonemes; analysis of ida4 and ida5 mutants lacking dynein d; expression profiling of mouse NYD-SP14 in ciliated tissues\",\n      \"journal\": \"Eukaryotic cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal immunoprecipitation in Chlamydomonas with mutant analysis; mouse ortholog expression confirmed but functional validation limited to expression data\",\n      \"pmids\": [\"17981992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Bi-allelic truncating mutations in TTC29 cause MMAF (multiple morphological abnormalities of flagella) in humans and mice. Loss of TTC29 results in dramatically reduced staining of IFT-B complex proteins TTC30A and IFT52 in sperm flagella, placing TTC29 upstream of or required for IFT-B complex assembly/localization in the flagellum.\",\n      \"method\": \"Whole-exome sequencing in human MMAF patients; immunofluorescence of patient spermatozoa; CRISPR-Cas9 Ttc29 knockout mouse model with sperm motility and ultrastructure analysis (TEM)\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human genetic data replicated in mouse KO model, immunofluorescence showing IFT-B reduction, ultrastructural analysis; independently replicated in a second concurrent paper (PMID:31735292)\",\n      \"pmids\": [\"31735294\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TTC29 is an evolutionarily conserved axonemal protein required for flagellar beating. In T. brucei, the TPR (tetratricopeptide repeat) structural motifs of TTC29 are critical for its axonemal localization; loss-of-function in T. brucei abolishes flagellar beating. Loss-of-function in mice similarly impairs flagellar structure and beating.\",\n      \"method\": \"Loss-of-function models in T. brucei (flagellated protist) and M. musculus; site-directed analysis of TPR motifs for axonemal localization; confirmation of splicing variant effect on transcript and protein\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent model organisms (T. brucei and mouse KO), mutagenesis of TPR motifs for localization, replicated across labs concurrently with PMID:31735294\",\n      \"pmids\": [\"31735292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TTC29 forms an axonemal complex with ZMYND12 and DNAH1. In T. brucei, co-immunoprecipitation and ultrastructure expansion microscopy showed TbTAX-1 (ZMYND12 ortholog) forms a complex with TTC29. Comparative proteomics using Ttc29 KO mouse samples identified DNAH1 as a third member of this complex. Loss of ZMYND12 causes altered localization of TTC29 in human sperm.\",\n      \"method\": \"Co-immunoprecipitation in T. brucei; ultrastructure expansion microscopy; comparative proteomics (Ttc29 KO mice vs. controls); immunofluorescence of patient spermatozoa\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, orthogonal ultrastructure microscopy, comparative proteomics across two model systems identifying the same complex members\",\n      \"pmids\": [\"37934199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ZMYND12 interacts with TTC29 and PRKACA in sperm flagella. In Zmynd12 knockout mice, PRKACA levels in sperm are reduced, linking the TTC29-ZMYND12 axonemal complex to the cAMP/PKA signaling pathway relevant for capacitation and flagellar motility.\",\n      \"method\": \"Co-immunoprecipitation and mass spectrometry in Zmynd12-/- mouse sperm; CRISPR/Cas9 knockout mouse model; western blotting for PRKACA levels\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with mass spectrometry in KO mouse model; single lab study linking TTC29-containing complex to PRKACA\",\n      \"pmids\": [\"39066891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"TTC29 was identified as an interacting protein of androglobin (ADGB) in human sperm by co-immunoprecipitation, expanding TTC29's known protein interaction network in the sperm flagellum.\",\n      \"method\": \"Co-immunoprecipitation validated by STRING database screening\",\n      \"journal\": \"Journal of Sichuan University. Medical science edition\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP experiment, single lab, no functional follow-up for the TTC29-ADGB interaction specifically\",\n      \"pmids\": [\"41834962\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TTC29 is an evolutionarily conserved axonemal tetratricopeptide repeat (TPR) protein that functions as a subunit of inner dynein arm d (IDAd); its TPR motifs are required for axonemal localization, and it forms a stable complex with ZMYND12 and DNAH1 that is critical for flagellar beating—loss of TTC29 disrupts IFT-B complex (TTC30A, IFT52) localization in the flagellum and causes the MMAF (multiple morphological abnormalities of flagella) phenotype and male infertility in both humans and mice.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TTC29 is an evolutionarily conserved axonemal tetratricopeptide repeat (TPR) protein that functions as a component of inner-arm dynein d (IDAd) and is required for flagellar beating [#0, #2]. First characterized in Chlamydomonas as the p44 subunit that forms a complex with p38 at the dynein d docking site on the outer doublet microtubule [#0], TTC29 depends on its TPR structural motifs for axonemal localization, and its loss abolishes flagellar beating in T. brucei and impairs flagellar structure and motility in mice [#2]. Within the axoneme, TTC29 forms a stable complex with ZMYND12 and DNAH1; ZMYND12 is required for correct TTC29 localization in human sperm, and the complex is further linked to cAMP/PKA signaling through PRKACA [#3, #4]. Loss of TTC29 reduces axonemal localization of IFT-B complex proteins TTC30A and IFT52 [#1]. Bi-allelic truncating mutations in TTC29 cause multiple morphological abnormalities of the flagella (MMAF) and male infertility in humans, a phenotype recapitulated in Ttc29 knockout mice [#1, #2].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Established TTC29's identity as an axonemal protein by placing its Chlamydomonas ortholog p44 within inner-arm dynein d, addressing where this conserved TPR protein acts in the cilium/flagellum.\",\n      \"evidence\": \"Immunoprecipitation from Chlamydomonas axonemes with ida4/ida5 mutant analysis; mouse ortholog expression profiling\",\n      \"pmids\": [\"17981992\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of the mammalian ortholog inferred only from expression, not tested\", \"Molecular nature of the p44-p38 docking interaction not resolved\", \"No structural model of dynein d docking\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated that TTC29 loss causes MMAF and male infertility and is required for axonemal IFT-B protein localization, connecting the gene to a human disease and a flagellar assembly defect.\",\n      \"evidence\": \"Whole-exome sequencing in MMAF patients, patient sperm immunofluorescence, and CRISPR Ttc29 knockout mouse with TEM ultrastructure\",\n      \"pmids\": [\"31735294\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which TTC29 controls IFT-B localization not defined\", \"Whether the IFT-B defect is direct or secondary to axonemal disruption unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed the TPR motifs are required for axonemal targeting and that the beating defect is conserved across distant species, establishing TTC29 as a conserved beating factor and defining its localization determinant.\",\n      \"evidence\": \"Loss-of-function in T. brucei and mouse with site-directed analysis of TPR motifs\",\n      \"pmids\": [\"31735292\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding partners contacted by the TPR motifs at the axoneme not identified at this stage\", \"How TPR-dependent localization couples to beating mechanics unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified the TTC29 axonemal complex as containing ZMYND12 and DNAH1, defining its direct molecular partners and the hierarchy of localization within the complex.\",\n      \"evidence\": \"Co-immunoprecipitation in T. brucei, ultrastructure expansion microscopy, comparative proteomics in Ttc29 KO mice, and patient sperm immunofluorescence\",\n      \"pmids\": [\"37934199\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and architecture of the TTC29-ZMYND12-DNAH1 complex not resolved\", \"Direct versus indirect nature of the DNAH1 association not fully distinguished\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Linked the TTC29-ZMYND12 complex to cAMP/PKA signaling via PRKACA, suggesting a route by which the axonemal complex influences motility-related signaling.\",\n      \"evidence\": \"Co-immunoprecipitation/mass spectrometry and PRKACA western blotting in Zmynd12 knockout mouse sperm\",\n      \"pmids\": [\"39066891\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of reduced PRKACA for capacitation not directly tested\", \"Single-lab study\", \"Whether TTC29 itself contacts PRKACA unresolved\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Expanded the TTC29 interaction network by detecting androglobin (ADGB) as a flagellar binding partner.\",\n      \"evidence\": \"Co-immunoprecipitation validated by STRING screening in human sperm\",\n      \"pmids\": [\"41834962\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single Co-IP without reciprocal validation or functional follow-up\", \"Biological significance of the TTC29-ADGB interaction unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TTC29-dependent assembly of inner dynein arm d mechanically drives flagellar beating, and how the complex coordinates IFT-B localization and PKA signaling, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution structure of the TTC29 complex within the axoneme\", \"Causal chain from TTC29 loss to IFT-B mislocalization undefined\", \"Direct enzymatic or signaling activity of TTC29 unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 2, 3]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"complexes\": [\"inner-arm dynein d (IDAd)\", \"TTC29-ZMYND12-DNAH1 axonemal complex\"],\n    \"partners\": [\"ZMYND12\", \"DNAH1\", \"PRKACA\", \"ADGB\", \"TTC30A\", \"IFT52\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}