{"gene":"DNAH1","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2013,"finding":"DNAH1 encodes an inner dynein arm heavy chain; loss-of-function mutations cause axonemal disorganization including mislocalization of microtubule doublets and loss of inner dynein arms in sperm flagella, leading to MMAF and male infertility. Neither transcript nor protein was detected in affected individuals with a splice-site mutation, confirming pathogenicity.","method":"RT-PCR, immunostaining, transmission electron microscopy on patient sperm; homozygosity mapping","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (RT-PCR, immunostaining, TEM), replicated across subsequent studies, foundational mechanistic paper","pmids":["24360805"],"is_preprint":false},{"year":2016,"finding":"DNAH1 splice-site mutation (c.8626-1G>A) results in complete absence of both DNAH1 RNA and protein in sperm, confirming that loss of DNAH1 protein underlies the MMAF phenotype.","method":"RT-PCR and immunochemistry on sperm samples from affected individuals","journal":"Human reproduction (Oxford, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal methods (RT-PCR + immunochemistry), single lab","pmids":["27798045"],"is_preprint":false},{"year":2016,"finding":"A homozygous frameshift mutation in DNAH1 (c.11726_11727delCT) leads to absence of DNAH1 protein in spermatozoa (despite mRNA expression), and causes flagellar ultrastructural defects detectable by scanning and transmission electron microscopy.","method":"Western blot, immunofluorescence staining, scanning and transmission electron microscopy on patient sperm","journal":"Clinical genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (Western blot, IF, TEM), single lab","pmids":["27573432"],"is_preprint":false},{"year":2019,"finding":"A missense mutation in Dnah1 (ferf1 allele) in mice causes abnormal sperm clumping, aberrant sperm motility, and failure to penetrate the zona pellucida, but ferf1 sperm can fertilize zona-free oocytes, indicating DNAH1 is required for normal flagellar function and zona penetration.","method":"ENU mutagenesis mouse model, in vitro fertilization assay with zona-intact and zona-free oocytes, sperm motility analysis","journal":"Molecular reproduction and development","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic mouse model with defined mechanistic phenotype (zona penetration failure), multiple functional readouts","pmids":["30734403"],"is_preprint":false},{"year":2021,"finding":"DNAH1 mutations cause loss of inner dynein arm and radial spoke from the axoneme, displacement of dense fibers and microtubule doublets, and are associated with dramatically reduced DNALI1 mRNA expression in patient sperm, suggesting a functional interdependence between DNAH1 and DNALI1.","method":"Transmission electron microscopy, quantitative PCR of DNALI1 mRNA in patient sperm","journal":"DNA and cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — TEM and qPCR, single lab, two orthogonal methods","pmids":["33989052"],"is_preprint":false},{"year":2021,"finding":"In Dnah1Δiso1/Δiso1 mice lacking the full-length isoform, a second DNAH1 isoform (isoform 2) is present and may mediate formation of normal ultrastructure in the absence of full-length protein, providing a mechanistic explanation for the phenotypic discordance between mouse and human DNAH1 mutants.","method":"Dnah1 knockout mouse model generation, transmission electron microscopy, SPAG6 immunostaining","journal":"Frontiers in endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — mouse model with TEM and immunostaining, single lab, single study","pmids":["34867808"],"is_preprint":false},{"year":2023,"finding":"DNAH1 loss-of-function results in absence of inner dynein arms but not outer dynein arms in the sperm axoneme, leading to general ultrastructural disorganization including loss of the central pair and mislocalization of microtubule doublets and outer dense fibers.","method":"Immunostaining (inner vs outer dynein arm markers), transmission electron microscopy on patient sperm","journal":"Andrology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — immunostaining with specific IDA/ODA markers and TEM, single lab","pmids":["37302001"],"is_preprint":false},{"year":2023,"finding":"DNAH1 is part of an axonemal complex together with ZMYND12 and TTC29; loss of ZMYND12 causes altered localization of DNAH1 (and DNALI1, WDR66, TTC29) in human sperm, and comparative proteomics in Trypanosoma and Ttc29 KO mice identified DNAH1 as a third member of the ZMYND12-TTC29 complex.","method":"Co-immunoprecipitation, comparative proteomics (Trypanosoma and Ttc29 KO mice), immunofluorescence in human sperm, ultrastructure expansion microscopy in T. brucei","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — Co-IP, comparative proteomics, multiple model systems, and ultrastructure expansion microscopy converging on the same complex","pmids":["37934199"],"is_preprint":false},{"year":2024,"finding":"DNAH12 physically interacts with DNAH1 (and DNALI1), and DNAH12 deficiency causes failure to recruit DNAH1 and DNALI1 to inner dynein arms in sperm flagella, impairing sperm development without affecting ciliary function.","method":"Co-immunoprecipitation, Dnah12 knockout/mutant mouse models, transmission electron microscopy, immunofluorescence","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP demonstrating direct interaction, mouse KO model with TEM and IF, but preprint not yet peer-reviewed","pmids":["bio_10.1101_2024.06.20.599934"],"is_preprint":true},{"year":2024,"finding":"Disease-causing variants in CCDC39 and CCDC40 (which form a molecular ruler complex maintaining 96 nm axonemal repeat units) cause absence of DNAH1 (along with DNAH6 and DNAH7) from respiratory ciliary axonemes, demonstrating that DNAH1 localization to cilia depends on the CCDC39/CCDC40 ruler complex.","method":"Immunofluorescence analysis of respiratory cilia in a cohort of 51 individuals with CCDC39/CCDC40 variants","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 3 / Strong — immunofluorescence in large patient cohort (n=51), single method but replicated across many individuals","pmids":["39056782"],"is_preprint":false}],"current_model":"DNAH1 is an inner dynein arm (IDA) heavy chain that localizes to axonemes of sperm flagella (and respiratory cilia), where it is recruited to IDA positions via interactions with DNAH12 and as part of an axonemal complex with ZMYND12 and TTC29; loss of DNAH1 causes absence of inner dynein arms, disorganization of the central pair apparatus, mislocalization of microtubule doublets, and severely impaired sperm motility leading to MMAF-associated male infertility, while its localization to cilia depends on the CCDC39/CCDC40 molecular ruler complex."},"narrative":{"mechanistic_narrative":"DNAH1 encodes an inner dynein arm (IDA) heavy chain required for the structural and functional integrity of sperm flagellar axonemes [PMID:24360805]. Loss of DNAH1 causes selective absence of inner dynein arms (with outer arms preserved), loss of radial spokes, disruption of the central pair apparatus, and mislocalization of microtubule doublets and outer dense fibers, producing multiple morphological abnormalities of the sperm flagella (MMAF) and male infertility [PMID:24360805, PMID:37302001]. DNAH1 is incorporated into the IDA through physical association with partner proteins: it co-assembles with ZMYND12 and TTC29 in an axonemal complex [PMID:37934199] and is recruited to inner dynein arm positions by DNAH12, whose deficiency prevents flagellar loading of both DNAH1 and DNALI1 [PMID:bio_10.1101_2024.06.20.599934]. Its broader axonemal localization, in respiratory cilia as well, depends on the CCDC39/CCDC40 molecular ruler complex that establishes the 96 nm repeat [PMID:39056782]. A mouse model demonstrates that DNAH1 is needed for normal flagellar beat and for sperm penetration of the zona pellucida, since mutant sperm fertilize only zona-free oocytes [PMID:30734403].","teleology":[{"year":2013,"claim":"Established that DNAH1 is an inner dynein arm heavy chain whose loss causes axonemal disorganization and MMAF, defining the gene's basic role in flagellar architecture and male fertility.","evidence":"RT-PCR, immunostaining, and TEM on patient sperm with homozygosity mapping","pmids":["24360805"],"confidence":"High","gaps":["Did not resolve which direct partners recruit DNAH1 to the axoneme","Mechanism linking IDA loss to doublet mislocalization unspecified"]},{"year":2016,"claim":"Confirmed that distinct loss-of-function alleles abolish DNAH1 protein in sperm and underlie the MMAF ultrastructural phenotype, solidifying pathogenicity across independent patients.","evidence":"RT-PCR, Western blot, immunofluorescence, and electron microscopy on patient sperm carrying splice-site and frameshift mutations","pmids":["27798045","27573432"],"confidence":"Medium","gaps":["Single-lab cohorts","No functional reconstitution of the missing protein"]},{"year":2019,"claim":"Showed in a genetic mouse model that DNAH1 is required for normal flagellar motility and zona pellucida penetration, providing in vivo functional confirmation beyond patient correlations.","evidence":"ENU mutagenesis Dnah1 (ferf1) mouse, sperm motility analysis, and IVF with zona-intact versus zona-free oocytes","pmids":["30734403"],"confidence":"High","gaps":["Missense allele may retain partial function","Does not address respiratory ciliary role"]},{"year":2021,"claim":"Linked DNAH1 loss to reduced DNALI1 expression and identified a partial-isoform mechanism explaining mouse-human phenotypic discordance, refining how DNAH1 isoforms support axonemal assembly.","evidence":"TEM and qPCR on patient sperm; Dnah1Δiso1 knockout mouse with TEM and SPAG6 immunostaining","pmids":["33989052","34867808"],"confidence":"Medium","gaps":["Functional interdependence with DNALI1 inferred from mRNA, not protein interaction","Isoform 2 contribution not directly demonstrated in human"]},{"year":2023,"claim":"Defined DNAH1 as part of a conserved ZMYND12-TTC29 axonemal complex and confirmed selective IDA (not ODA) loss, advancing from phenotype to molecular complex membership.","evidence":"Co-IP, comparative proteomics in Trypanosoma and Ttc29 KO mice, IF in human sperm, expansion microscopy in T. brucei; IDA/ODA marker immunostaining and TEM","pmids":["37934199","37302001"],"confidence":"High","gaps":["Stoichiometry and direct binding interfaces within the complex unresolved","Order of assembly relative to DNAH1 loading unknown"]},{"year":2024,"claim":"Identified DNAH12 as the direct partner recruiting DNAH1 to inner dynein arms and established that CCDC39/CCDC40 ruler integrity is required for DNAH1 axonemal localization, mapping the recruitment hierarchy.","evidence":"Co-IP and Dnah12 KO/mutant mice with TEM and IF (preprint); immunofluorescence of respiratory cilia in 51 individuals with CCDC39/CCDC40 variants","pmids":["bio_10.1101_2024.06.20.599934","39056782"],"confidence":"Medium","gaps":["DNAH12 interaction from preprint, not peer-reviewed","Whether CCDC39/CCDC40 act directly on DNAH1 or via the ruler scaffold not distinguished"]},{"year":null,"claim":"The motor mechanochemistry of DNAH1 and the structural basis of its assembly into the IDA with DNAH12, ZMYND12, and TTC29 remain uncharacterized.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of DNAH1 within the inner dynein arm","ATPase/motor activity not directly assayed","Direct binding interfaces among complex members undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003774","term_label":"cytoskeletal motor activity","supporting_discovery_ids":[0,6]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[7,8]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[9]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,6]}],"pathway":[{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[0,3]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[7,9]}],"complexes":["inner dynein arm","ZMYND12-TTC29-DNAH1 axonemal complex"],"partners":["DNAH12","DNALI1","ZMYND12","TTC29"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9P2D7","full_name":"Dynein axonemal heavy chain 1","aliases":["Axonemal beta dynein heavy chain 1","Ciliary dynein heavy chain 1","Heat shock regulated protein 1","HSRF-1","hDHC7"],"length_aa":4265,"mass_kda":487.5,"function":"Force generating protein of cilia required for sperm flagellum motility. Produces force towards the minus ends of microtubules. Dynein has ATPase activity; the force-producing power stroke is thought to occur on release of ADP. Required in spermatozoa for the formation of the inner dynein arms and biogenesis of the axoneme (PubMed:24360805)","subcellular_location":"Cytoplasm, cytoskeleton, cilium axoneme; Cell projection, cilium, flagellum","url":"https://www.uniprot.org/uniprotkb/Q9P2D7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DNAH1","classification":"Not Classified","n_dependent_lines":6,"n_total_lines":1208,"dependency_fraction":0.004966887417218543},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DNAH1","total_profiled":1310},"omim":[{"mim_id":"621209","title":"SPERMATOGENIC FAILURE 100; SPGF100","url":"https://www.omim.org/entry/621209"},{"mim_id":"620354","title":"SPERMATOGENIC FAILURE 83; SPGF83","url":"https://www.omim.org/entry/620354"},{"mim_id":"618801","title":"CILIARY DYSKINESIA, PRIMARY, 45; CILD45","url":"https://www.omim.org/entry/618801"},{"mim_id":"618146","title":"CILIA- AND FLAGELLA-ASSOCIATED PROTEIN 251; CFAP251","url":"https://www.omim.org/entry/618146"},{"mim_id":"617577","title":"CILIARY DYSKINESIA, PRIMARY, 37; CILD37","url":"https://www.omim.org/entry/617577"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DNAH1"},"hgnc":{"alias_symbol":["XLHSRF-1","DNAHC1","HDHC7","HL-11","HL11"],"prev_symbol":[]},"alphafold":{"accession":"Q9P2D7","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9P2D7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9P2D7-3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9P2D7-3-F1-predicted_aligned_error_v6.png","plddt_mean":78.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DNAH1","jax_strain_url":"https://www.jax.org/strain/search?query=DNAH1"},"sequence":{"accession":"Q9P2D7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9P2D7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9P2D7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9P2D7"}},"corpus_meta":[{"pmid":"24360805","id":"PMC_24360805","title":"Mutations in DNAH1, which encodes an inner arm heavy chain dynein, lead to male infertility from multiple morphological abnormalities of the sperm flagella.","date":"2013","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/24360805","citation_count":343,"is_preprint":false},{"pmid":"27798045","id":"PMC_27798045","title":"Whole-exome sequencing of familial cases of multiple morphological abnormalities of the sperm flagella (MMAF) reveals new DNAH1 mutations.","date":"2016","source":"Human reproduction (Oxford, England)","url":"https://pubmed.ncbi.nlm.nih.gov/27798045","citation_count":95,"is_preprint":false},{"pmid":"27573432","id":"PMC_27573432","title":"Homozygous DNAH1 frameshift mutation causes multiple morphological anomalies of the sperm flagella in Chinese.","date":"2016","source":"Clinical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/27573432","citation_count":74,"is_preprint":false},{"pmid":"28577616","id":"PMC_28577616","title":"DNAH1 gene mutations and their potential association with dysplasia of the sperm fibrous sheath and infertility in the Han Chinese population.","date":"2017","source":"Fertility and sterility","url":"https://pubmed.ncbi.nlm.nih.gov/28577616","citation_count":72,"is_preprint":false},{"pmid":"25927852","id":"PMC_25927852","title":"Variation in DNAH1 may contribute to primary ciliary dyskinesia.","date":"2015","source":"BMC medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/25927852","citation_count":57,"is_preprint":false},{"pmid":"35118838","id":"PMC_35118838","title":"Novel DNAH1 Mutation Loci Lead to Multiple Morphological Abnormalities of the Sperm Flagella and Literature Review.","date":"2022","source":"The world journal of men's health","url":"https://pubmed.ncbi.nlm.nih.gov/35118838","citation_count":34,"is_preprint":false},{"pmid":"30544445","id":"PMC_30544445","title":"Associations between DNAH1 gene polymorphisms and male infertility: A retrospective study.","date":"2018","source":"Medicine","url":"https://pubmed.ncbi.nlm.nih.gov/30544445","citation_count":16,"is_preprint":false},{"pmid":"33929677","id":"PMC_33929677","title":"Mutational landscape of DNAH1 in Chinese patients with multiple morphological abnormalities of the sperm flagella: cohort study and literature review.","date":"2021","source":"Journal of assisted reproduction and genetics","url":"https://pubmed.ncbi.nlm.nih.gov/33929677","citation_count":16,"is_preprint":false},{"pmid":"34867808","id":"PMC_34867808","title":"Novel Loss-of-Function Mutations in DNAH1 Displayed Different Phenotypic Spectrum in Humans and Mice.","date":"2021","source":"Frontiers in endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/34867808","citation_count":16,"is_preprint":false},{"pmid":"37302001","id":"PMC_37302001","title":"Novel biallelic variants in DNAH1 cause multiple morphological abnormalities of sperm flagella with favorable outcomes of fertility after ICSI in Han Chinese males.","date":"2023","source":"Andrology","url":"https://pubmed.ncbi.nlm.nih.gov/37302001","citation_count":15,"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":"35456050","id":"PMC_35456050","title":"Genetic Variations and mRNA Expression of Goat DNAH1 and Their Associations with Litter Size.","date":"2022","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/35456050","citation_count":14,"is_preprint":false},{"pmid":"36510862","id":"PMC_36510862","title":"Novel compound heterozygous mutations in DNAH1 cause primary infertility in Han Chinese males with multiple morphological abnormalities of the sperm flagella.","date":"2023","source":"Asian journal of andrology","url":"https://pubmed.ncbi.nlm.nih.gov/36510862","citation_count":12,"is_preprint":false},{"pmid":"33989052","id":"PMC_33989052","title":"Novel Biallelic DNAH1 Variations Cause Multiple Morphological Abnormalities of the Sperm Flagella.","date":"2021","source":"DNA and cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/33989052","citation_count":11,"is_preprint":false},{"pmid":"33968654","id":"PMC_33968654","title":"Novel bi-allelic mutations in DNAH1 cause multiple morphological abnormalities of the sperm flagella resulting in male infertility.","date":"2021","source":"Translational andrology and urology","url":"https://pubmed.ncbi.nlm.nih.gov/33968654","citation_count":10,"is_preprint":false},{"pmid":"39056782","id":"PMC_39056782","title":"Primary Ciliary Dyskinesia Associated Disease-Causing Variants in CCDC39 and CCDC40 Cause Axonemal Absence of Inner Dynein Arm Heavy Chains DNAH1, DNAH6, and DNAH7.","date":"2024","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/39056782","citation_count":9,"is_preprint":false},{"pmid":"30734403","id":"PMC_30734403","title":"ENU-induced mutant allele of Dnah1, ferf1, causes abnormal sperm behavior and fertilization failure in mice.","date":"2019","source":"Molecular reproduction and development","url":"https://pubmed.ncbi.nlm.nih.gov/30734403","citation_count":9,"is_preprint":false},{"pmid":"25761240","id":"PMC_25761240","title":"A perilipin gene from Clonostachys rosea f. Catenulata HL-1-1 is related to sclerotial parasitism.","date":"2015","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/25761240","citation_count":7,"is_preprint":false},{"pmid":"37457836","id":"PMC_37457836","title":"Identification of novel compound heterozygous variants in the DNAH1 gene of a Chinese family with left-right asymmetry disorder.","date":"2023","source":"Frontiers in molecular biosciences","url":"https://pubmed.ncbi.nlm.nih.gov/37457836","citation_count":3,"is_preprint":false},{"pmid":"34672773","id":"PMC_34672773","title":"Successful Live Birth Following Natural Cycle Oocyte Retrieval in a Woman with Primary Infertility and Atypical Primary Ovarian Insufficiency with a DNAH1 Gene Deletion Mutation.","date":"2021","source":"Genetic testing and molecular biomarkers","url":"https://pubmed.ncbi.nlm.nih.gov/34672773","citation_count":2,"is_preprint":false},{"pmid":"34487528","id":"PMC_34487528","title":"[Analysis of DNAH1 gene variant in two infertile males with multiple morphological abnormalities of sperm flagella].","date":"2021","source":"Zhonghua yi xue yi chuan xue za zhi = Zhonghua yixue yichuanxue zazhi = Chinese journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/34487528","citation_count":0,"is_preprint":false},{"pmid":"41615819","id":"PMC_41615819","title":"Novel DNAH1 variants in Chinese males with MMAF-associated asthenoteratozoospermia.","date":"2026","source":"Systems biology in reproductive medicine","url":"https://pubmed.ncbi.nlm.nih.gov/41615819","citation_count":0,"is_preprint":false},{"pmid":"39841794","id":"PMC_39841794","title":"Expanding the Genetic Etiology of Multiple Morphological Abnormalities of the Sperm Flagella: A Case Report of Two Novel DNAH1 Variants.","date":"2024","source":"South Dakota medicine : the journal of the South Dakota State Medical Association","url":"https://pubmed.ncbi.nlm.nih.gov/39841794","citation_count":0,"is_preprint":false},{"pmid":"40896606","id":"PMC_40896606","title":"Glomerulocystic Kidney Disease in an Adult with DNAH1 Mutation: A Case Report.","date":"2024","source":"Indian journal of nephrology","url":"https://pubmed.ncbi.nlm.nih.gov/40896606","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2024.06.20.599934","title":"Deficiency in DNAH12 causes male infertility by impairing DNAH1 and DNALI1 recruitment in humans and mice","date":"2024-06-23","source":"bioRxiv","url":"https://doi.org/10.1101/2024.06.20.599934","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":14885,"output_tokens":2316,"usd":0.039697,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9402,"output_tokens":2483,"usd":0.054543,"stage2_stop_reason":"end_turn"},"total_usd":0.09424,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2013,\n      \"finding\": \"DNAH1 encodes an inner dynein arm heavy chain; loss-of-function mutations cause axonemal disorganization including mislocalization of microtubule doublets and loss of inner dynein arms in sperm flagella, leading to MMAF and male infertility. Neither transcript nor protein was detected in affected individuals with a splice-site mutation, confirming pathogenicity.\",\n      \"method\": \"RT-PCR, immunostaining, transmission electron microscopy on patient sperm; homozygosity mapping\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (RT-PCR, immunostaining, TEM), replicated across subsequent studies, foundational mechanistic paper\",\n      \"pmids\": [\"24360805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DNAH1 splice-site mutation (c.8626-1G>A) results in complete absence of both DNAH1 RNA and protein in sperm, confirming that loss of DNAH1 protein underlies the MMAF phenotype.\",\n      \"method\": \"RT-PCR and immunochemistry on sperm samples from affected individuals\",\n      \"journal\": \"Human reproduction (Oxford, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal methods (RT-PCR + immunochemistry), single lab\",\n      \"pmids\": [\"27798045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"A homozygous frameshift mutation in DNAH1 (c.11726_11727delCT) leads to absence of DNAH1 protein in spermatozoa (despite mRNA expression), and causes flagellar ultrastructural defects detectable by scanning and transmission electron microscopy.\",\n      \"method\": \"Western blot, immunofluorescence staining, scanning and transmission electron microscopy on patient sperm\",\n      \"journal\": \"Clinical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (Western blot, IF, TEM), single lab\",\n      \"pmids\": [\"27573432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A missense mutation in Dnah1 (ferf1 allele) in mice causes abnormal sperm clumping, aberrant sperm motility, and failure to penetrate the zona pellucida, but ferf1 sperm can fertilize zona-free oocytes, indicating DNAH1 is required for normal flagellar function and zona penetration.\",\n      \"method\": \"ENU mutagenesis mouse model, in vitro fertilization assay with zona-intact and zona-free oocytes, sperm motility analysis\",\n      \"journal\": \"Molecular reproduction and development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic mouse model with defined mechanistic phenotype (zona penetration failure), multiple functional readouts\",\n      \"pmids\": [\"30734403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DNAH1 mutations cause loss of inner dynein arm and radial spoke from the axoneme, displacement of dense fibers and microtubule doublets, and are associated with dramatically reduced DNALI1 mRNA expression in patient sperm, suggesting a functional interdependence between DNAH1 and DNALI1.\",\n      \"method\": \"Transmission electron microscopy, quantitative PCR of DNALI1 mRNA in patient sperm\",\n      \"journal\": \"DNA and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — TEM and qPCR, single lab, two orthogonal methods\",\n      \"pmids\": [\"33989052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In Dnah1Δiso1/Δiso1 mice lacking the full-length isoform, a second DNAH1 isoform (isoform 2) is present and may mediate formation of normal ultrastructure in the absence of full-length protein, providing a mechanistic explanation for the phenotypic discordance between mouse and human DNAH1 mutants.\",\n      \"method\": \"Dnah1 knockout mouse model generation, transmission electron microscopy, SPAG6 immunostaining\",\n      \"journal\": \"Frontiers in endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — mouse model with TEM and immunostaining, single lab, single study\",\n      \"pmids\": [\"34867808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DNAH1 loss-of-function results in absence of inner dynein arms but not outer dynein arms in the sperm axoneme, leading to general ultrastructural disorganization including loss of the central pair and mislocalization of microtubule doublets and outer dense fibers.\",\n      \"method\": \"Immunostaining (inner vs outer dynein arm markers), transmission electron microscopy on patient sperm\",\n      \"journal\": \"Andrology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — immunostaining with specific IDA/ODA markers and TEM, single lab\",\n      \"pmids\": [\"37302001\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DNAH1 is part of an axonemal complex together with ZMYND12 and TTC29; loss of ZMYND12 causes altered localization of DNAH1 (and DNALI1, WDR66, TTC29) in human sperm, and comparative proteomics in Trypanosoma and Ttc29 KO mice identified DNAH1 as a third member of the ZMYND12-TTC29 complex.\",\n      \"method\": \"Co-immunoprecipitation, comparative proteomics (Trypanosoma and Ttc29 KO mice), immunofluorescence in human sperm, ultrastructure expansion microscopy in T. brucei\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — Co-IP, comparative proteomics, multiple model systems, and ultrastructure expansion microscopy converging on the same complex\",\n      \"pmids\": [\"37934199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DNAH12 physically interacts with DNAH1 (and DNALI1), and DNAH12 deficiency causes failure to recruit DNAH1 and DNALI1 to inner dynein arms in sperm flagella, impairing sperm development without affecting ciliary function.\",\n      \"method\": \"Co-immunoprecipitation, Dnah12 knockout/mutant mouse models, transmission electron microscopy, immunofluorescence\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP demonstrating direct interaction, mouse KO model with TEM and IF, but preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2024.06.20.599934\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Disease-causing variants in CCDC39 and CCDC40 (which form a molecular ruler complex maintaining 96 nm axonemal repeat units) cause absence of DNAH1 (along with DNAH6 and DNAH7) from respiratory ciliary axonemes, demonstrating that DNAH1 localization to cilia depends on the CCDC39/CCDC40 ruler complex.\",\n      \"method\": \"Immunofluorescence analysis of respiratory cilia in a cohort of 51 individuals with CCDC39/CCDC40 variants\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Strong — immunofluorescence in large patient cohort (n=51), single method but replicated across many individuals\",\n      \"pmids\": [\"39056782\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DNAH1 is an inner dynein arm (IDA) heavy chain that localizes to axonemes of sperm flagella (and respiratory cilia), where it is recruited to IDA positions via interactions with DNAH12 and as part of an axonemal complex with ZMYND12 and TTC29; loss of DNAH1 causes absence of inner dynein arms, disorganization of the central pair apparatus, mislocalization of microtubule doublets, and severely impaired sperm motility leading to MMAF-associated male infertility, while its localization to cilia depends on the CCDC39/CCDC40 molecular ruler complex.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DNAH1 encodes an inner dynein arm (IDA) heavy chain required for the structural and functional integrity of sperm flagellar axonemes [#0]. Loss of DNAH1 causes selective absence of inner dynein arms (with outer arms preserved), loss of radial spokes, disruption of the central pair apparatus, and mislocalization of microtubule doublets and outer dense fibers, producing multiple morphological abnormalities of the sperm flagella (MMAF) and male infertility [#0, #6]. DNAH1 is incorporated into the IDA through physical association with partner proteins: it co-assembles with ZMYND12 and TTC29 in an axonemal complex [#7] and is recruited to inner dynein arm positions by DNAH12, whose deficiency prevents flagellar loading of both DNAH1 and DNALI1 [#8]. Its broader axonemal localization, in respiratory cilia as well, depends on the CCDC39/CCDC40 molecular ruler complex that establishes the 96 nm repeat [#9]. A mouse model demonstrates that DNAH1 is needed for normal flagellar beat and for sperm penetration of the zona pellucida, since mutant sperm fertilize only zona-free oocytes [#3].\",\n  \"teleology\": [\n    {\n      \"year\": 2013,\n      \"claim\": \"Established that DNAH1 is an inner dynein arm heavy chain whose loss causes axonemal disorganization and MMAF, defining the gene's basic role in flagellar architecture and male fertility.\",\n      \"evidence\": \"RT-PCR, immunostaining, and TEM on patient sperm with homozygosity mapping\",\n      \"pmids\": [\"24360805\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve which direct partners recruit DNAH1 to the axoneme\", \"Mechanism linking IDA loss to doublet mislocalization unspecified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Confirmed that distinct loss-of-function alleles abolish DNAH1 protein in sperm and underlie the MMAF ultrastructural phenotype, solidifying pathogenicity across independent patients.\",\n      \"evidence\": \"RT-PCR, Western blot, immunofluorescence, and electron microscopy on patient sperm carrying splice-site and frameshift mutations\",\n      \"pmids\": [\"27798045\", \"27573432\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab cohorts\", \"No functional reconstitution of the missing protein\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed in a genetic mouse model that DNAH1 is required for normal flagellar motility and zona pellucida penetration, providing in vivo functional confirmation beyond patient correlations.\",\n      \"evidence\": \"ENU mutagenesis Dnah1 (ferf1) mouse, sperm motility analysis, and IVF with zona-intact versus zona-free oocytes\",\n      \"pmids\": [\"30734403\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Missense allele may retain partial function\", \"Does not address respiratory ciliary role\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Linked DNAH1 loss to reduced DNALI1 expression and identified a partial-isoform mechanism explaining mouse-human phenotypic discordance, refining how DNAH1 isoforms support axonemal assembly.\",\n      \"evidence\": \"TEM and qPCR on patient sperm; Dnah1\\u0394iso1 knockout mouse with TEM and SPAG6 immunostaining\",\n      \"pmids\": [\"33989052\", \"34867808\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional interdependence with DNALI1 inferred from mRNA, not protein interaction\", \"Isoform 2 contribution not directly demonstrated in human\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined DNAH1 as part of a conserved ZMYND12-TTC29 axonemal complex and confirmed selective IDA (not ODA) loss, advancing from phenotype to molecular complex membership.\",\n      \"evidence\": \"Co-IP, comparative proteomics in Trypanosoma and Ttc29 KO mice, IF in human sperm, expansion microscopy in T. brucei; IDA/ODA marker immunostaining and TEM\",\n      \"pmids\": [\"37934199\", \"37302001\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and direct binding interfaces within the complex unresolved\", \"Order of assembly relative to DNAH1 loading unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified DNAH12 as the direct partner recruiting DNAH1 to inner dynein arms and established that CCDC39/CCDC40 ruler integrity is required for DNAH1 axonemal localization, mapping the recruitment hierarchy.\",\n      \"evidence\": \"Co-IP and Dnah12 KO/mutant mice with TEM and IF (preprint); immunofluorescence of respiratory cilia in 51 individuals with CCDC39/CCDC40 variants\",\n      \"pmids\": [\"bio_10.1101_2024.06.20.599934\", \"39056782\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"DNAH12 interaction from preprint, not peer-reviewed\", \"Whether CCDC39/CCDC40 act directly on DNAH1 or via the ruler scaffold not distinguished\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The motor mechanochemistry of DNAH1 and the structural basis of its assembly into the IDA with DNAH12, ZMYND12, and TTC29 remain uncharacterized.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of DNAH1 within the inner dynein arm\", \"ATPase/motor activity not directly assayed\", \"Direct binding interfaces among complex members undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003774\", \"supporting_discovery_ids\": [0, 6]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [7, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005930\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [7, 9]}\n    ],\n    \"complexes\": [\"inner dynein arm\", \"ZMYND12-TTC29-DNAH1 axonemal complex\"],\n    \"partners\": [\"DNAH12\", \"DNALI1\", \"ZMYND12\", \"TTC29\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}