{"gene":"DNAH1","run_date":"2026-04-28T17:46:02","timeline":{"discoveries":[{"year":2013,"finding":"DNAH1 encodes an inner dynein arm heavy chain required for sperm flagellar axoneme integrity; loss-of-function mutations cause mislocalization of microtubule doublets and complete loss of inner dynein arms in sperm flagella, leading to multiple morphological abnormalities of the flagella (MMAF) and male infertility.","method":"RT-PCR, immunostaining, and transmission electron microscopy on patient sperm with homozygous splice-site mutation; confirmed absence of DNAH1 transcript and protein","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — clean loss-of-function with defined ultrastructural phenotype, replicated across multiple patients","pmids":["24360805"],"is_preprint":false},{"year":2016,"finding":"DNAH1 mutations cause absence of DNAH1 transcript and protein in sperm, confirmed at both RNA and protein level, establishing loss-of-function as the pathogenic mechanism in MMAF.","method":"RT-PCR and immunochemistry on sperm from patients with homozygous splice-site mutation (c.8626-1G>A)","journal":"Human reproduction (Oxford, England)","confidence":"Medium","confidence_rationale":"Tier 2 — two orthogonal methods (RT-PCR + immunochemistry) in a single lab replicating prior finding","pmids":["27798045"],"is_preprint":false},{"year":2016,"finding":"Homozygous frameshift mutation in DNAH1 (c.11726_11727delCT) abolishes DNAH1 protein in spermatozoa despite presence of mRNA, resulting in abnormal sperm flagella ultrastructure.","method":"Western blot, immunofluorescence staining, scanning electron microscopy, and transmission electron microscopy on patient sperm","journal":"Clinical genetics","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods showing protein absence despite mRNA expression, single lab","pmids":["27573432"],"is_preprint":false},{"year":2019,"finding":"A missense mutation in Dnah1 (ferf1 allele) in mice causes abnormal sperm clumping, aberrant motility, and failure to penetrate the zona pellucida, but allows fertilization of zona-free oocytes, demonstrating DNAH1 is required for normal flagellar beating and zona penetration.","method":"ENU mutagenesis mouse model, in vitro fertilization assays with zona-intact and zona-free oocytes, sperm motility analysis","journal":"Molecular reproduction and development","confidence":"High","confidence_rationale":"Tier 1-2 — in vivo mouse model with defined mechanistic readouts (zona penetration assay)","pmids":["30734403"],"is_preprint":false},{"year":2021,"finding":"DNAH1 loss-of-function mutations cause disruption of the central pair of microtubules and disorganization of the fibrous sheath in sperm flagella, as confirmed by SPAG6 staining (a central pair marker), and DNAH1 isoform2 in mice may partially compensate for loss of the full-length protein.","method":"Whole-exome sequencing, transmission electron microscopy, immunofluorescence (SPAG6 staining), and generation of Dnah1 knockout mouse models","journal":"Frontiers in endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — mouse KO model with ultrastructural analysis and functional marker staining, single lab","pmids":["34867808"],"is_preprint":false},{"year":2021,"finding":"DNAH1 biallelic variants cause absence of inner dynein arms and radial spokes, and displacement of dense fibers and microtubule doublets in sperm flagella; additionally, loss of DNAH1 leads to dramatically reduced expression of DNALI1.","method":"Transmission electron microscopy, quantitative PCR of DNALI1 mRNA in patient sperm","journal":"DNA and cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — ultrastructural analysis plus quantitative expression analysis of interacting component, single lab","pmids":["33989052"],"is_preprint":false},{"year":2023,"finding":"ZMYND12 forms an axonemal complex with TTC29 and DNAH1; loss of ZMYND12 causes altered localization of DNAH1, DNALI1, WDR66, and TTC29 in sperm, establishing DNAH1 as a component of a defined inner dynein arm complex critical for flagellum assembly.","method":"Co-immunoprecipitation, comparative proteomics (Trypanosoma brucei and Ttc29 KO mice), immunofluorescence, ultrastructure expansion microscopy, RNAi knockdown in T. brucei","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1-2 — reciprocal Co-IP and proteomics across two model systems with functional RNAi validation","pmids":["37934199"],"is_preprint":false},{"year":2023,"finding":"DNAH1 deficiency in sperm causes absence of inner dynein arms but not outer dynein arms, with secondary 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 with DNAH1 mutations","journal":"Andrology","confidence":"Medium","confidence_rationale":"Tier 2 — immunostaining with specific IDA/ODA markers plus TEM, single lab","pmids":["37302001"],"is_preprint":false},{"year":2024,"finding":"CCDC39 and CCDC40 (components of the 96 nm axonemal ruler complex) are required for proper assembly of inner dynein arm heavy chains including DNAH1, DNAH6, and DNAH7 in respiratory cilia; loss of CCDC39/CCDC40 causes conspicuous absence of DNAH1 from ciliary axonemes.","method":"Immunofluorescence analyses of respiratory ciliary axonemes from patients with CCDC39/CCDC40 mutations identified by next-generation sequencing","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 — immunofluorescence in 51-patient cohort establishing pathway dependency, single lab","pmids":["39056782"],"is_preprint":false},{"year":2024,"finding":"DNAH12 physically interacts with DNAH1 and DNALI1 (inner dynein arm components), and DNAH12 deficiency leads to failed recruitment of DNAH1 and DNALI1 to inner dynein arms in sperm flagella, causing axonemal disorganization without affecting cilia.","method":"Co-immunoprecipitation (DNAH12 with DNAH1 and DNALI1), Dnah12 knockout and knockin mouse models, transmission electron microscopy, immunofluorescence","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus mouse KO model with ultrastructural readout; preprint not yet peer-reviewed","pmids":["bio_10.1101_2024.06.20.599934"],"is_preprint":true}],"current_model":"DNAH1 is an inner dynein arm heavy chain that localizes to the axoneme of sperm flagella (and respiratory cilia), where it functions as part of a complex with DNALI1, TTC29, and ZMYND12 (assembled with the aid of DNAH12 and the CCDC39/CCDC40 ruler complex); loss-of-function mutations abolish inner dynein arm assembly, disrupting central pair integrity and microtubule doublet organization, causing multiple morphological abnormalities of the sperm flagella, impaired motility, and male infertility."},"narrative":{"teleology":[{"year":2013,"claim":"The first causal link between DNAH1 and flagellar biology was established: loss-of-function mutations abolish inner dynein arms and disorganize microtubule doublets in human sperm, identifying DNAH1 as essential for axoneme integrity and a genetic cause of MMAF-associated male infertility.","evidence":"RT-PCR, immunostaining, and TEM on sperm from patients with homozygous splice-site mutations","pmids":["24360805"],"confidence":"High","gaps":["No direct protein interaction partners of DNAH1 were identified","Role in non-sperm cilia was not examined","Mechanism by which DNAH1 loss leads to central pair disruption was unclear"]},{"year":2016,"claim":"Replication studies confirmed that distinct DNAH1 mutations (splice-site and frameshift) converge on loss of DNAH1 protein and flagellar ultrastructural defects, solidifying loss-of-function as the pathogenic mechanism.","evidence":"RT-PCR, western blot, immunofluorescence, and electron microscopy on independent patient cohorts","pmids":["27798045","27573432"],"confidence":"Medium","gaps":["No animal model yet available to test causality in vivo","Molecular partners within the inner dynein arm remained unidentified"]},{"year":2019,"claim":"A mouse model demonstrated that a Dnah1 missense mutation causes aberrant flagellar beating insufficient for zona pellucida penetration, establishing DNAH1's requirement for functional sperm motility beyond structural integrity.","evidence":"ENU mutagenesis mouse model with in vitro fertilization assays using zona-intact and zona-free oocytes","pmids":["30734403"],"confidence":"High","gaps":["The missense allele may retain partial function; complete null phenotype in mouse not yet characterized","Downstream signaling or force-generation mechanism not resolved"]},{"year":2021,"claim":"DNAH1 deficiency was shown to specifically eliminate inner dynein arms and radial spokes while reducing DNALI1 expression, and to disrupt the central pair (assessed by SPAG6 staining), revealing that DNAH1 loss has cascading effects on multiple axonemal substructures and partner protein stability.","evidence":"TEM, immunofluorescence with central pair and IDA markers, quantitative PCR, and Dnah1 KO mouse models","pmids":["34867808","33989052"],"confidence":"Medium","gaps":["Direct physical interaction between DNAH1 and DNALI1 not yet demonstrated","Whether a DNAH1 isoform2 provides partial compensation in vivo remained unclear"]},{"year":2023,"claim":"DNAH1 was placed within a defined inner dynein arm complex containing ZMYND12, TTC29, and DNALI1, and its selective absence from the inner (but not outer) dynein arm was confirmed with specific markers, resolving its precise sub-axonemal identity.","evidence":"Reciprocal co-immunoprecipitation, comparative proteomics in Trypanosoma brucei and Ttc29 KO mice, RNAi, ultrastructure expansion microscopy, and immunostaining with IDA/ODA markers in patient sperm","pmids":["37934199","37302001"],"confidence":"High","gaps":["Stoichiometry and direct binding interfaces within the ZMYND12–TTC29–DNAH1–DNALI1 complex are unresolved","No structural model of the complex exists"]},{"year":2024,"claim":"Assembly of DNAH1 into the axoneme was shown to depend on the CCDC39/CCDC40 96 nm ruler complex in respiratory cilia and on DNAH12 in sperm flagella, positioning DNAH1 downstream of two distinct assembly/recruitment pathways.","evidence":"Immunofluorescence of respiratory cilia from CCDC39/CCDC40-mutant patients; co-immunoprecipitation of DNAH12 with DNAH1 and DNALI1 in Dnah12 KO/knockin mouse models (preprint)","pmids":["39056782","bio_10.1101_2024.06.20.599934"],"confidence":"Medium","gaps":["DNAH12 interaction data from preprint awaits peer review","Whether CCDC39/CCDC40 and DNAH12 act in the same or parallel pathways for DNAH1 recruitment is unknown","Tissue-specific differences in assembly requirements (cilia vs. flagella) not fully delineated"]},{"year":null,"claim":"The ATPase catalytic mechanism of DNAH1, its precise position along the 96 nm axonemal repeat, and the structural basis for its interactions with ZMYND12, TTC29, DNALI1, and DNAH12 remain uncharacterized.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No cryo-EM or high-resolution structure of DNAH1 or its complex","Enzymatic ATPase parameters not measured","Functional redundancy among inner dynein arm heavy chains not systematically tested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0,3]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,3,4,6,7,8]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,6,8]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[0,3]}],"complexes":["ZMYND12–TTC29–DNAH1–DNALI1 inner dynein arm complex"],"partners":["ZMYND12","TTC29","DNALI1","DNAH12","CCDC39","CCDC40"],"other_free_text":[]},"mechanistic_narrative":"DNAH1 is an inner dynein arm heavy chain essential for the structural integrity and motility of sperm flagella and respiratory cilia. It resides in a defined axonemal inner dynein arm complex with ZMYND12, TTC29, and DNALI1, and its assembly into the axoneme depends on the CCDC39/CCDC40 ruler complex and on DNAH12, which physically interacts with DNAH1 and DNALI1 to recruit them to inner dynein arms [PMID:37934199, PMID:39056782, PMID:bio_10.1101_2024.06.20.599934]. Loss of DNAH1 abolishes inner dynein arms while leaving outer dynein arms intact, and secondarily disrupts the central pair of microtubules, radial spokes, and outer dense fiber organization, producing multiple morphological abnormalities of the sperm flagella (MMAF) and male infertility [PMID:24360805, PMID:37302001, PMID:33989052]. Biallelic loss-of-function mutations in DNAH1 are a recognized genetic cause of MMAF-associated male infertility, confirmed across multiple independent patient cohorts and mouse models [PMID:24360805, PMID:30734403]."},"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":335,"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":94,"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":73,"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":71,"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":55,"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":33,"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":"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":"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":15,"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":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":"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":"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":"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 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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":"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":"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":"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":"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":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":14103,"output_tokens":2260,"usd":0.038104},"stage2":{"model":"claude-opus-4-6","input_tokens":5567,"output_tokens":2068,"usd":0.119303},"total_usd":0.157407,"stage1_batch_id":"msgbatch_0118RScg3WGaGkaZRtWZbtce","stage2_batch_id":"msgbatch_01Cpfzvtbj42aqp5oYZ5Te2s","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 required for sperm flagellar axoneme integrity; loss-of-function mutations cause mislocalization of microtubule doublets and complete loss of inner dynein arms in sperm flagella, leading to multiple morphological abnormalities of the flagella (MMAF) and male infertility.\",\n      \"method\": \"RT-PCR, immunostaining, and transmission electron microscopy on patient sperm with homozygous splice-site mutation; confirmed absence of DNAH1 transcript and protein\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean loss-of-function with defined ultrastructural phenotype, replicated across multiple patients\",\n      \"pmids\": [\"24360805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DNAH1 mutations cause absence of DNAH1 transcript and protein in sperm, confirmed at both RNA and protein level, establishing loss-of-function as the pathogenic mechanism in MMAF.\",\n      \"method\": \"RT-PCR and immunochemistry on sperm from patients with homozygous splice-site mutation (c.8626-1G>A)\",\n      \"journal\": \"Human reproduction (Oxford, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — two orthogonal methods (RT-PCR + immunochemistry) in a single lab replicating prior finding\",\n      \"pmids\": [\"27798045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Homozygous frameshift mutation in DNAH1 (c.11726_11727delCT) abolishes DNAH1 protein in spermatozoa despite presence of mRNA, resulting in abnormal sperm flagella ultrastructure.\",\n      \"method\": \"Western blot, immunofluorescence staining, scanning electron microscopy, and transmission electron microscopy on patient sperm\",\n      \"journal\": \"Clinical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods showing protein absence despite mRNA expression, 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 motility, and failure to penetrate the zona pellucida, but allows fertilization of zona-free oocytes, demonstrating DNAH1 is required for normal flagellar beating and zona penetration.\",\n      \"method\": \"ENU mutagenesis mouse model, in vitro fertilization assays with zona-intact and zona-free oocytes, sperm motility analysis\",\n      \"journal\": \"Molecular reproduction and development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vivo mouse model with defined mechanistic readouts (zona penetration assay)\",\n      \"pmids\": [\"30734403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DNAH1 loss-of-function mutations cause disruption of the central pair of microtubules and disorganization of the fibrous sheath in sperm flagella, as confirmed by SPAG6 staining (a central pair marker), and DNAH1 isoform2 in mice may partially compensate for loss of the full-length protein.\",\n      \"method\": \"Whole-exome sequencing, transmission electron microscopy, immunofluorescence (SPAG6 staining), and generation of Dnah1 knockout mouse models\",\n      \"journal\": \"Frontiers in endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mouse KO model with ultrastructural analysis and functional marker staining, single lab\",\n      \"pmids\": [\"34867808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DNAH1 biallelic variants cause absence of inner dynein arms and radial spokes, and displacement of dense fibers and microtubule doublets in sperm flagella; additionally, loss of DNAH1 leads to dramatically reduced expression of 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 — ultrastructural analysis plus quantitative expression analysis of interacting component, single lab\",\n      \"pmids\": [\"33989052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ZMYND12 forms an axonemal complex with TTC29 and DNAH1; loss of ZMYND12 causes altered localization of DNAH1, DNALI1, WDR66, and TTC29 in sperm, establishing DNAH1 as a component of a defined inner dynein arm complex critical for flagellum assembly.\",\n      \"method\": \"Co-immunoprecipitation, comparative proteomics (Trypanosoma brucei and Ttc29 KO mice), immunofluorescence, ultrastructure expansion microscopy, RNAi knockdown in T. brucei\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reciprocal Co-IP and proteomics across two model systems with functional RNAi validation\",\n      \"pmids\": [\"37934199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DNAH1 deficiency in sperm causes absence of inner dynein arms but not outer dynein arms, with secondary 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 with DNAH1 mutations\",\n      \"journal\": \"Andrology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — immunostaining with specific IDA/ODA markers plus TEM, single lab\",\n      \"pmids\": [\"37302001\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CCDC39 and CCDC40 (components of the 96 nm axonemal ruler complex) are required for proper assembly of inner dynein arm heavy chains including DNAH1, DNAH6, and DNAH7 in respiratory cilia; loss of CCDC39/CCDC40 causes conspicuous absence of DNAH1 from ciliary axonemes.\",\n      \"method\": \"Immunofluorescence analyses of respiratory ciliary axonemes from patients with CCDC39/CCDC40 mutations identified by next-generation sequencing\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — immunofluorescence in 51-patient cohort establishing pathway dependency, single lab\",\n      \"pmids\": [\"39056782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DNAH12 physically interacts with DNAH1 and DNALI1 (inner dynein arm components), and DNAH12 deficiency leads to failed recruitment of DNAH1 and DNALI1 to inner dynein arms in sperm flagella, causing axonemal disorganization without affecting cilia.\",\n      \"method\": \"Co-immunoprecipitation (DNAH12 with DNAH1 and DNALI1), Dnah12 knockout and knockin mouse models, transmission electron microscopy, immunofluorescence\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus mouse KO model with ultrastructural readout; preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2024.06.20.599934\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"DNAH1 is an inner dynein arm heavy chain that localizes to the axoneme of sperm flagella (and respiratory cilia), where it functions as part of a complex with DNALI1, TTC29, and ZMYND12 (assembled with the aid of DNAH12 and the CCDC39/CCDC40 ruler complex); loss-of-function mutations abolish inner dynein arm assembly, disrupting central pair integrity and microtubule doublet organization, causing multiple morphological abnormalities of the sperm flagella, impaired motility, and male infertility.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"DNAH1 is an inner dynein arm heavy chain essential for the structural integrity and motility of sperm flagella and respiratory cilia. It resides in a defined axonemal inner dynein arm complex with ZMYND12, TTC29, and DNALI1, and its assembly into the axoneme depends on the CCDC39/CCDC40 ruler complex and on DNAH12, which physically interacts with DNAH1 and DNALI1 to recruit them to inner dynein arms [PMID:37934199, PMID:39056782, PMID:bio_10.1101_2024.06.20.599934]. Loss of DNAH1 abolishes inner dynein arms while leaving outer dynein arms intact, and secondarily disrupts the central pair of microtubules, radial spokes, and outer dense fiber organization, producing multiple morphological abnormalities of the sperm flagella (MMAF) and male infertility [PMID:24360805, PMID:37302001, PMID:33989052]. Biallelic loss-of-function mutations in DNAH1 are a recognized genetic cause of MMAF-associated male infertility, confirmed across multiple independent patient cohorts and mouse models [PMID:24360805, PMID:30734403].\",\n  \"teleology\": [\n    {\n      \"year\": 2013,\n      \"claim\": \"The first causal link between DNAH1 and flagellar biology was established: loss-of-function mutations abolish inner dynein arms and disorganize microtubule doublets in human sperm, identifying DNAH1 as essential for axoneme integrity and a genetic cause of MMAF-associated male infertility.\",\n      \"evidence\": \"RT-PCR, immunostaining, and TEM on sperm from patients with homozygous splice-site mutations\",\n      \"pmids\": [\"24360805\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No direct protein interaction partners of DNAH1 were identified\",\n        \"Role in non-sperm cilia was not examined\",\n        \"Mechanism by which DNAH1 loss leads to central pair disruption was unclear\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Replication studies confirmed that distinct DNAH1 mutations (splice-site and frameshift) converge on loss of DNAH1 protein and flagellar ultrastructural defects, solidifying loss-of-function as the pathogenic mechanism.\",\n      \"evidence\": \"RT-PCR, western blot, immunofluorescence, and electron microscopy on independent patient cohorts\",\n      \"pmids\": [\"27798045\", \"27573432\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No animal model yet available to test causality in vivo\",\n        \"Molecular partners within the inner dynein arm remained unidentified\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"A mouse model demonstrated that a Dnah1 missense mutation causes aberrant flagellar beating insufficient for zona pellucida penetration, establishing DNAH1's requirement for functional sperm motility beyond structural integrity.\",\n      \"evidence\": \"ENU mutagenesis mouse model with in vitro fertilization assays using zona-intact and zona-free oocytes\",\n      \"pmids\": [\"30734403\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The missense allele may retain partial function; complete null phenotype in mouse not yet characterized\",\n        \"Downstream signaling or force-generation mechanism not resolved\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"DNAH1 deficiency was shown to specifically eliminate inner dynein arms and radial spokes while reducing DNALI1 expression, and to disrupt the central pair (assessed by SPAG6 staining), revealing that DNAH1 loss has cascading effects on multiple axonemal substructures and partner protein stability.\",\n      \"evidence\": \"TEM, immunofluorescence with central pair and IDA markers, quantitative PCR, and Dnah1 KO mouse models\",\n      \"pmids\": [\"34867808\", \"33989052\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct physical interaction between DNAH1 and DNALI1 not yet demonstrated\",\n        \"Whether a DNAH1 isoform2 provides partial compensation in vivo remained unclear\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"DNAH1 was placed within a defined inner dynein arm complex containing ZMYND12, TTC29, and DNALI1, and its selective absence from the inner (but not outer) dynein arm was confirmed with specific markers, resolving its precise sub-axonemal identity.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation, comparative proteomics in Trypanosoma brucei and Ttc29 KO mice, RNAi, ultrastructure expansion microscopy, and immunostaining with IDA/ODA markers in patient sperm\",\n      \"pmids\": [\"37934199\", \"37302001\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Stoichiometry and direct binding interfaces within the ZMYND12–TTC29–DNAH1–DNALI1 complex are unresolved\",\n        \"No structural model of the complex exists\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Assembly of DNAH1 into the axoneme was shown to depend on the CCDC39/CCDC40 96 nm ruler complex in respiratory cilia and on DNAH12 in sperm flagella, positioning DNAH1 downstream of two distinct assembly/recruitment pathways.\",\n      \"evidence\": \"Immunofluorescence of respiratory cilia from CCDC39/CCDC40-mutant patients; co-immunoprecipitation of DNAH12 with DNAH1 and DNALI1 in Dnah12 KO/knockin mouse models (preprint)\",\n      \"pmids\": [\"39056782\", \"bio_10.1101_2024.06.20.599934\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"DNAH12 interaction data from preprint awaits peer review\",\n        \"Whether CCDC39/CCDC40 and DNAH12 act in the same or parallel pathways for DNAH1 recruitment is unknown\",\n        \"Tissue-specific differences in assembly requirements (cilia vs. flagella) not fully delineated\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The ATPase catalytic mechanism of DNAH1, its precise position along the 96 nm axonemal repeat, and the structural basis for its interactions with ZMYND12, TTC29, DNALI1, and DNAH12 remain uncharacterized.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No cryo-EM or high-resolution structure of DNAH1 or its complex\",\n        \"Enzymatic ATPase parameters not measured\",\n        \"Functional redundancy among inner dynein arm heavy chains not systematically tested\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 3, 4, 6, 7, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 6, 8]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"complexes\": [\n      \"ZMYND12–TTC29–DNAH1–DNALI1 inner dynein arm complex\"\n    ],\n    \"partners\": [\n      \"ZMYND12\",\n      \"TTC29\",\n      \"DNALI1\",\n      \"DNAH12\",\n      \"CCDC39\",\n      \"CCDC40\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}