{"gene":"DNAH2","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2019,"finding":"DNAH2 is a component of the inner dynein arms (IDA) in sperm flagella axonemes, as demonstrated by immunofluorescence showing DNAH2 and DNALI (inner dynein arm components) were present in sperm cells lacking DNAH17 (an outer dynein arm component), establishing DNAH2's localization to the inner dynein arm compartment.","method":"Immunofluorescence and immunoblot on human sperm cells from patients with DNAH17 mutations","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct immunofluorescence localization with functional context (ODA-deficient background), single lab, two orthogonal methods (IF + immunoblot)","pmids":["31178125"],"is_preprint":false},{"year":2019,"finding":"Mutations in DNAH2 cause multiple morphological abnormalities of the sperm flagella (MMAF) in humans. Patient sperm show severely disarranged axonemal structures with mitochondrial sheath defects, significantly decreased DNAH2 protein, and absence of inner dynein arms, establishing DNAH2 as required for inner dynein arm assembly in sperm flagella.","method":"Whole-exome sequencing, Sanger sequencing validation, transmission electron microscopy, immunofluorescence on patient sperm","journal":"Clinical genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (WES, TEM ultrastructure, IF protein localization), replicated across multiple independent patients/labs","pmids":["30811583"],"is_preprint":false},{"year":2019,"finding":"DNAH2 (as a heavy chain subunit of vertebrate Dynein-f/inner dynein arm-f) associates with the intermediate chain Wdr78 (vertebrate IC138 orthologue) and Wdr63 (IC140 orthologue), forming a complex required for axonemal localization; RNAi depletion of either Wdr78 or Dnah2 paralyzed mouse ependymal cilia, and Wdr78 depletion caused loss of all Dynein-f subunits from cilia.","method":"Co-immunoprecipitation (association assay), RNAi knockdown in mouse ependymal cells, zebrafish morpholino knockdown, ciliary beat analysis","journal":"Journal of molecular cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal association assays, RNAi functional validation in two model systems (mouse and zebrafish), multiple orthogonal readouts","pmids":["30060180"],"is_preprint":false},{"year":2014,"finding":"DNAH2 protein contains a region of significant sequence homology to the synthetic BRAF V600E peptide (residues 596–606: GLATEKSRWSG), and the VE1 antibody cross-reacts with DNAH2 epitopes as demonstrated by ELISA, confirming DNAH2 is a major component of axonemes in cilia and flagella where it drives microtubule sliding.","method":"ELISA cross-reactivity assay, sequence homology analysis","journal":"Modern pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct in vitro ELISA binding assay confirming protein-antibody interaction, sequence analysis supporting epitope identification, single lab","pmids":["25412847"],"is_preprint":false},{"year":2021,"finding":"DNAH2 is essential for multiple steps in sperm flagella formation: Dnah2-null male mice (CRISPR/Cas9 knockout) are infertile with MMAF phenotype (absent, short, bent, coiled flagella); null spermatids show misexpression of centriolar proteins, delocalization of annulus proteins, severely disorganized flagellar ultrastructure, and compromised expression of other axonemal components DNAH1 and RSPH3.","method":"CRISPR/Cas9 knockout mice, scanning and transmission electron microscopy, immunofluorescence, Western blot","journal":"Frontiers in cell and developmental biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vivo genetic knockout with multiple orthogonal ultrastructural and molecular readouts, clear male-specific infertility phenotype","pmids":["33968937"],"is_preprint":false},{"year":2021,"finding":"Bi-allelic DNAH2 variants in human patients cause absence of the central pair of microtubules and inner dynein arms in sperm axonemes, as revealed by transmission electron microscopy, with reduced DNAH2 protein by immunofluorescence.","method":"Whole-exome sequencing, Sanger sequencing, TEM, scanning electron microscopy, immunofluorescence","journal":"Reproductive biomedicine online","confidence":"High","confidence_rationale":"Tier 2 / Strong — ultrastructural (TEM) and protein-level (IF) evidence in multiple unrelated patients, replicated finding across independent cohorts","pmids":["33771466"],"is_preprint":false},{"year":2021,"finding":"DNAH2 modulates homologous recombination repair in the Fanconi anemia pathway: DNAH2 knockdown in U2OS cells increased sensitivity to mitomycin C (DNA inter-strand crosslinks), reduced enrichment of FANCD2 at DNA damage sites, and decreased ubiquitination of FANCD2, suggesting DNAH2 promotes FANCD2 ubiquitination and recruitment to damage foci.","method":"Homologous recombination repair assay, mitomycin C sensitivity assay, immunofluorescence, ubiquitination modification assay in U2OS and DR-U2OS cell lines","journal":"Blood science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays (HR repair, MMC sensitivity, IF, ubiquitination), single lab, mechanistic pathway placement","pmids":["35402838"],"is_preprint":false},{"year":2022,"finding":"In a patient with CCDC40 mutations causing PCD, immunofluorescence showed loss of DNAH2 in both respiratory cilia and sperm, establishing that DNAH2 localization in inner dynein arms depends on intact CCDC40-mediated dynein regulatory complex assembly.","method":"Immunofluorescence on respiratory cilia and sperm from a patient with compound heterozygous CCDC40 variants","journal":"Pharmacogenomics and personalized medicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single patient case, single method (IF), no direct functional manipulation of DNAH2","pmids":["35449766"],"is_preprint":false},{"year":2024,"finding":"CEP76 mutation in mice leads to accumulation of DNAH2 (along with AKAP4) at the sperm neck rather than proper incorporation into the sperm tail, indicating that CEP76-mediated transition zone gating is required for DNAH2 entry into the ciliary/flagellar compartment.","method":"Genetic mouse knockout (Cep76 mutant), immunofluorescence localization of DNAH2 in sperm","journal":"Life science alliance","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic mouse model with direct protein localization readout, functional connection to transition zone gating, single lab","pmids":["38570187"],"is_preprint":false},{"year":2026,"finding":"In ZMYND10-related PCD, immunofluorescence showed that the double-headed IDA-f component DNAH2 was preserved despite loss of single-headed IDA components (DNALI1) and outer dynein arms (DNAH5), indicating DNAH2 assembly is not dependent on ZMYND10 and that different IDA subtypes have distinct assembly dependencies.","method":"Immunofluorescence on respiratory cilia from a PCD patient with ZMYND10 splice-site variant","journal":"Frontiers in medicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single patient case, single method (IF), no direct functional manipulation of DNAH2","pmids":["42180707"],"is_preprint":false},{"year":2028,"finding":"In Dnah2-null mice, DNAH2 silencing in human mesenchymal stem cells reduced SMO protein levels by 53.1% and GLI2 by 66.4%, suggesting DNAH2 modulates the SHH signaling pathway; Dnah2-null female mice showed vaginal atresia consistent with ciliary dysfunction.","method":"CRISPR/Cas9 Dnah2 knockout mice, siRNA silencing in hMSCs, Western blot for SHH pathway proteins","journal":"Pediatric surgery international","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preliminary single-lab study with small sample, SHH pathway connection not yet corroborated by independent data","pmids":["42228139"],"is_preprint":false}],"current_model":"DNAH2 is an axonemal dynein heavy chain that functions as a subunit of inner dynein arm-f (Dynein-f) in motile cilia and sperm flagella; it associates with intermediate chains WDR78 and WDR63 to form the Dynein-f complex required for ciliary beat, and its absence—through patient mutations or knockout in mice—causes severe flagellar ultrastructural defects (loss of inner dynein arms, absent central pair) and the MMAF phenotype of male infertility; additionally, DNAH2 participates in the Fanconi anemia homologous recombination repair pathway by promoting FANCD2 ubiquitination and recruitment to DNA damage sites, and its entry into the flagellar compartment is gated by the transition zone protein CEP76."},"narrative":{"mechanistic_narrative":"DNAH2 is an axonemal dynein heavy chain that serves as the motor subunit of the double-headed inner dynein arm-f (Dynein-f) complex driving microtubule sliding in motile cilia and sperm flagella [PMID:31178125, PMID:25412847]. It assembles into Dynein-f by associating with the intermediate chains WDR78 (IC138 orthologue) and WDR63 (IC140 orthologue), an interaction required for axonemal localization of the complex; depletion of DNAH2 or its partners paralyzes ciliary beat [PMID:30060180]. DNAH2 is essential for sperm flagellum biogenesis: loss of DNAH2 in human patients and Dnah2-null mice produces inner dynein arm absence, central-pair loss, severely disorganized flagellar ultrastructure, and compromised assembly of other axonemal components (DNAH1, RSPH3), manifesting as the multiple morphological abnormalities of the flagella (MMAF) phenotype and male infertility [PMID:30811583, PMID:33968937, PMID:33771466]. Bi-allelic DNAH2 variants are a cause of human MMAF-associated male infertility [PMID:30811583, PMID:33771466]. Proper incorporation of DNAH2 into the flagellar compartment depends on CEP76-mediated transition zone gating, since CEP76 loss causes DNAH2 to accumulate at the sperm neck rather than the tail [PMID:38570187]. Beyond its axonemal role, DNAH2 promotes homologous recombination repair in the Fanconi anemia pathway by facilitating FANCD2 ubiquitination and its recruitment to DNA damage sites [PMID:35402838].","teleology":[{"year":2014,"claim":"Established that DNAH2 is a major axonemal component of cilia and flagella involved in microtubule sliding, providing the first functional placement of the protein.","evidence":"ELISA cross-reactivity of the VE1 antibody with DNAH2 epitopes plus sequence homology analysis","pmids":["25412847"],"confidence":"Medium","gaps":["Inference of motor function rests on antibody cross-reactivity and homology, not direct motility assay","No localization to a specific dynein arm subtype shown"]},{"year":2019,"claim":"Resolved which axonemal compartment DNAH2 occupies, placing it specifically in the inner dynein arm rather than the outer arm.","evidence":"Immunofluorescence and immunoblot on human sperm from DNAH17 (ODA)-mutant patients","pmids":["31178125"],"confidence":"Medium","gaps":["Single lab, correlative localization","Does not define the molecular subcomplex DNAH2 belongs to"]},{"year":2019,"claim":"Defined DNAH2's molecular complex by showing it forms Dynein-f with intermediate chains WDR78 and WDR63 and that this assembly is required for ciliary motility.","evidence":"Co-immunoprecipitation plus RNAi/morpholino knockdown in mouse ependymal cells and zebrafish with ciliary beat analysis","pmids":["30060180"],"confidence":"High","gaps":["Stoichiometry and structural architecture of Dynein-f not resolved","Direct ATPase/motor activity of DNAH2 not measured"]},{"year":2019,"claim":"Linked DNAH2 loss-of-function to human disease, establishing it as a cause of MMAF with absent inner dynein arms.","evidence":"Whole-exome sequencing, TEM ultrastructure, and immunofluorescence on patient sperm","pmids":["30811583"],"confidence":"High","gaps":["Causality not confirmed by genetic rescue","Mechanism connecting DNAH2 loss to broader axonemal disarray unclear"]},{"year":2021,"claim":"Confirmed in vivo requirement for DNAH2 in flagellogenesis and showed it influences centriolar, annulus, and other axonemal protein organization.","evidence":"CRISPR/Cas9 Dnah2-null mice with SEM/TEM, immunofluorescence, and Western blot; bi-allelic patient variants with TEM showing central-pair and IDA loss","pmids":["33968937","33771466"],"confidence":"High","gaps":["How DNAH2 loss causes central-pair absence is not mechanistically explained","Order of assembly events upstream/downstream of DNAH2 undefined"]},{"year":2021,"claim":"Identified an unexpected non-axonemal role for DNAH2 in DNA repair, placing it in the Fanconi anemia homologous recombination pathway.","evidence":"HR repair assay, mitomycin C sensitivity, FANCD2 immunofluorescence, and ubiquitination assays in U2OS/DR-U2OS cells","pmids":["35402838"],"confidence":"Medium","gaps":["Direct physical interaction of DNAH2 with FANCD2 or the FA core complex not shown","Mechanism by which a dynein heavy chain promotes FANCD2 ubiquitination unknown","Single lab, not independently replicated"]},{"year":2022,"claim":"Showed DNAH2 axonemal localization depends on the dynein regulatory complex assembly factor CCDC40.","evidence":"Immunofluorescence on respiratory cilia and sperm from a CCDC40-mutant PCD patient","pmids":["35449766"],"confidence":"Low","gaps":["Single patient case with one method","No direct manipulation of DNAH2","Correlative loss does not prove direct dependency"]},{"year":2024,"claim":"Defined how DNAH2 reaches the flagellar compartment, implicating CEP76-mediated transition zone gating in its trafficking.","evidence":"Cep76-mutant mouse with immunofluorescence localization of DNAH2 in sperm","pmids":["38570187"],"confidence":"Medium","gaps":["Direct interaction between CEP76 and DNAH2 not demonstrated","Whether gating is selective for DNAH2 versus general cargo unclear"]},{"year":2026,"claim":"Distinguished DNAH2 assembly dependencies from other IDA subtypes, showing it is preserved in ZMYND10-related PCD.","evidence":"Immunofluorescence on respiratory cilia from a ZMYND10-mutant PCD patient","pmids":["42180707"],"confidence":"Low","gaps":["Single patient case, single method","No quantification or functional readout"]},{"year":2028,"claim":"Proposed a link between DNAH2 and SHH signaling and a female reproductive phenotype, extending DNAH2 function beyond sperm.","evidence":"Dnah2-null mice and siRNA silencing in hMSCs with Western blot for SMO/GLI2","pmids":["42228139"],"confidence":"Low","gaps":["Preliminary single-lab study with small sample","Mechanistic link between DNAH2 and SHH pathway proteins not established","SHH connection not independently corroborated"]},{"year":null,"claim":"The direct motor/ATPase activity of DNAH2, the structural architecture of the Dynein-f complex, and the molecular basis of its non-axonemal role in FANCD2-dependent DNA repair remain undefined.","evidence":"","pmids":[],"confidence":"Low","gaps":["No biochemical reconstitution of DNAH2 motor activity","No structural model of Dynein-f","Mechanism connecting a dynein heavy chain to Fanconi anemia repair unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003774","term_label":"cytoskeletal motor activity","supporting_discovery_ids":[2,3]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[3]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,2,7]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,1]}],"pathway":[{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[1,4,5]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[6]}],"complexes":["Dynein-f (inner dynein arm-f)"],"partners":["WDR78","WDR63"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9P225","full_name":"Dynein axonemal heavy chain 2","aliases":["Axonemal beta dynein heavy chain 2","Ciliary dynein heavy chain 2","Dynein heavy chain domain-containing protein 3"],"length_aa":4427,"mass_kda":507.7,"function":"As part of the axonemal inner dynein arm complex plays a central role in ciliary beat (PubMed:30811583). Expressed in sperm flagellum, it is required for sperm motility (PubMed:30811583). Dyneins are microtubule-based molecular motors possessing ATPase activities that can convert the chemical energy of ATP into relative sliding between adjacent microtubule doublets to generate ciliary bending (PubMed:30811583)","subcellular_location":"Cytoplasm, cytoskeleton, cilium axoneme; Cytoplasm, cytoskeleton, flagellum axoneme","url":"https://www.uniprot.org/uniprotkb/Q9P225/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DNAH2","classification":"Not Classified","n_dependent_lines":10,"n_total_lines":1208,"dependency_fraction":0.008278145695364239},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DNAH2","total_profiled":1310},"omim":[{"mim_id":"619156","title":"DYNEIN, AXONEMAL, INTERMEDIATE CHAIN 4; DNAI4","url":"https://www.omim.org/entry/619156"},{"mim_id":"619094","title":"SPERMATOGENIC FAILURE 45; SPGF45","url":"https://www.omim.org/entry/619094"},{"mim_id":"603333","title":"DYNEIN, AXONEMAL, HEAVY CHAIN 2; DNAH2","url":"https://www.omim.org/entry/603333"},{"mim_id":"258150","title":"SPERMATOGENIC FAILURE 1; SPGF1","url":"https://www.omim.org/entry/258150"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Microtubules","reliability":"Approved"},{"location":"Primary cilium","reliability":"Approved"},{"location":"Flagellar centriole","reliability":"Approved"},{"location":"End piece","reliability":"Approved"},{"location":"Cytokinetic bridge","reliability":"Additional"},{"location":"Mitotic spindle","reliability":"Additional"},{"location":"Basal body","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"fallopian tube","ntpm":12.3},{"tissue":"parathyroid gland","ntpm":9.9},{"tissue":"retina","ntpm":19.2},{"tissue":"testis","ntpm":6.2}],"url":"https://www.proteinatlas.org/search/DNAH2"},"hgnc":{"alias_symbol":["KIAA1503","FLJ46675"],"prev_symbol":["DNHD3"]},"alphafold":{"accession":"Q9P225","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9P225","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9P225-3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9P225-3-F1-predicted_aligned_error_v6.png","plddt_mean":73.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DNAH2","jax_strain_url":"https://www.jax.org/strain/search?query=DNAH2"},"sequence":{"accession":"Q9P225","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9P225.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9P225/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9P225"}},"corpus_meta":[{"pmid":"31178125","id":"PMC_31178125","title":"Mutations in DNAH17, Encoding a Sperm-Specific Axonemal Outer 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family.","date":"2026","source":"Frontiers in medicine","url":"https://pubmed.ncbi.nlm.nih.gov/42180707","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":20663,"output_tokens":2760,"usd":0.051694,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10065,"output_tokens":3188,"usd":0.065013,"stage2_stop_reason":"end_turn"},"total_usd":0.116707,"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\": 2019,\n      \"finding\": \"DNAH2 is a component of the inner dynein arms (IDA) in sperm flagella axonemes, as demonstrated by immunofluorescence showing DNAH2 and DNALI (inner dynein arm components) were present in sperm cells lacking DNAH17 (an outer dynein arm component), establishing DNAH2's localization to the inner dynein arm compartment.\",\n      \"method\": \"Immunofluorescence and immunoblot on human sperm cells from patients with DNAH17 mutations\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct immunofluorescence localization with functional context (ODA-deficient background), single lab, two orthogonal methods (IF + immunoblot)\",\n      \"pmids\": [\"31178125\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Mutations in DNAH2 cause multiple morphological abnormalities of the sperm flagella (MMAF) in humans. Patient sperm show severely disarranged axonemal structures with mitochondrial sheath defects, significantly decreased DNAH2 protein, and absence of inner dynein arms, establishing DNAH2 as required for inner dynein arm assembly in sperm flagella.\",\n      \"method\": \"Whole-exome sequencing, Sanger sequencing validation, transmission electron microscopy, immunofluorescence on patient sperm\",\n      \"journal\": \"Clinical genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (WES, TEM ultrastructure, IF protein localization), replicated across multiple independent patients/labs\",\n      \"pmids\": [\"30811583\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DNAH2 (as a heavy chain subunit of vertebrate Dynein-f/inner dynein arm-f) associates with the intermediate chain Wdr78 (vertebrate IC138 orthologue) and Wdr63 (IC140 orthologue), forming a complex required for axonemal localization; RNAi depletion of either Wdr78 or Dnah2 paralyzed mouse ependymal cilia, and Wdr78 depletion caused loss of all Dynein-f subunits from cilia.\",\n      \"method\": \"Co-immunoprecipitation (association assay), RNAi knockdown in mouse ependymal cells, zebrafish morpholino knockdown, ciliary beat analysis\",\n      \"journal\": \"Journal of molecular cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal association assays, RNAi functional validation in two model systems (mouse and zebrafish), multiple orthogonal readouts\",\n      \"pmids\": [\"30060180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DNAH2 protein contains a region of significant sequence homology to the synthetic BRAF V600E peptide (residues 596–606: GLATEKSRWSG), and the VE1 antibody cross-reacts with DNAH2 epitopes as demonstrated by ELISA, confirming DNAH2 is a major component of axonemes in cilia and flagella where it drives microtubule sliding.\",\n      \"method\": \"ELISA cross-reactivity assay, sequence homology analysis\",\n      \"journal\": \"Modern pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct in vitro ELISA binding assay confirming protein-antibody interaction, sequence analysis supporting epitope identification, single lab\",\n      \"pmids\": [\"25412847\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DNAH2 is essential for multiple steps in sperm flagella formation: Dnah2-null male mice (CRISPR/Cas9 knockout) are infertile with MMAF phenotype (absent, short, bent, coiled flagella); null spermatids show misexpression of centriolar proteins, delocalization of annulus proteins, severely disorganized flagellar ultrastructure, and compromised expression of other axonemal components DNAH1 and RSPH3.\",\n      \"method\": \"CRISPR/Cas9 knockout mice, scanning and transmission electron microscopy, immunofluorescence, Western blot\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vivo genetic knockout with multiple orthogonal ultrastructural and molecular readouts, clear male-specific infertility phenotype\",\n      \"pmids\": [\"33968937\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Bi-allelic DNAH2 variants in human patients cause absence of the central pair of microtubules and inner dynein arms in sperm axonemes, as revealed by transmission electron microscopy, with reduced DNAH2 protein by immunofluorescence.\",\n      \"method\": \"Whole-exome sequencing, Sanger sequencing, TEM, scanning electron microscopy, immunofluorescence\",\n      \"journal\": \"Reproductive biomedicine online\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ultrastructural (TEM) and protein-level (IF) evidence in multiple unrelated patients, replicated finding across independent cohorts\",\n      \"pmids\": [\"33771466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DNAH2 modulates homologous recombination repair in the Fanconi anemia pathway: DNAH2 knockdown in U2OS cells increased sensitivity to mitomycin C (DNA inter-strand crosslinks), reduced enrichment of FANCD2 at DNA damage sites, and decreased ubiquitination of FANCD2, suggesting DNAH2 promotes FANCD2 ubiquitination and recruitment to damage foci.\",\n      \"method\": \"Homologous recombination repair assay, mitomycin C sensitivity assay, immunofluorescence, ubiquitination modification assay in U2OS and DR-U2OS cell lines\",\n      \"journal\": \"Blood science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays (HR repair, MMC sensitivity, IF, ubiquitination), single lab, mechanistic pathway placement\",\n      \"pmids\": [\"35402838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In a patient with CCDC40 mutations causing PCD, immunofluorescence showed loss of DNAH2 in both respiratory cilia and sperm, establishing that DNAH2 localization in inner dynein arms depends on intact CCDC40-mediated dynein regulatory complex assembly.\",\n      \"method\": \"Immunofluorescence on respiratory cilia and sperm from a patient with compound heterozygous CCDC40 variants\",\n      \"journal\": \"Pharmacogenomics and personalized medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single patient case, single method (IF), no direct functional manipulation of DNAH2\",\n      \"pmids\": [\"35449766\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CEP76 mutation in mice leads to accumulation of DNAH2 (along with AKAP4) at the sperm neck rather than proper incorporation into the sperm tail, indicating that CEP76-mediated transition zone gating is required for DNAH2 entry into the ciliary/flagellar compartment.\",\n      \"method\": \"Genetic mouse knockout (Cep76 mutant), immunofluorescence localization of DNAH2 in sperm\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic mouse model with direct protein localization readout, functional connection to transition zone gating, single lab\",\n      \"pmids\": [\"38570187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"In ZMYND10-related PCD, immunofluorescence showed that the double-headed IDA-f component DNAH2 was preserved despite loss of single-headed IDA components (DNALI1) and outer dynein arms (DNAH5), indicating DNAH2 assembly is not dependent on ZMYND10 and that different IDA subtypes have distinct assembly dependencies.\",\n      \"method\": \"Immunofluorescence on respiratory cilia from a PCD patient with ZMYND10 splice-site variant\",\n      \"journal\": \"Frontiers in medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single patient case, single method (IF), no direct functional manipulation of DNAH2\",\n      \"pmids\": [\"42180707\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2028,\n      \"finding\": \"In Dnah2-null mice, DNAH2 silencing in human mesenchymal stem cells reduced SMO protein levels by 53.1% and GLI2 by 66.4%, suggesting DNAH2 modulates the SHH signaling pathway; Dnah2-null female mice showed vaginal atresia consistent with ciliary dysfunction.\",\n      \"method\": \"CRISPR/Cas9 Dnah2 knockout mice, siRNA silencing in hMSCs, Western blot for SHH pathway proteins\",\n      \"journal\": \"Pediatric surgery international\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preliminary single-lab study with small sample, SHH pathway connection not yet corroborated by independent data\",\n      \"pmids\": [\"42228139\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DNAH2 is an axonemal dynein heavy chain that functions as a subunit of inner dynein arm-f (Dynein-f) in motile cilia and sperm flagella; it associates with intermediate chains WDR78 and WDR63 to form the Dynein-f complex required for ciliary beat, and its absence—through patient mutations or knockout in mice—causes severe flagellar ultrastructural defects (loss of inner dynein arms, absent central pair) and the MMAF phenotype of male infertility; additionally, DNAH2 participates in the Fanconi anemia homologous recombination repair pathway by promoting FANCD2 ubiquitination and recruitment to DNA damage sites, and its entry into the flagellar compartment is gated by the transition zone protein CEP76.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DNAH2 is an axonemal dynein heavy chain that serves as the motor subunit of the double-headed inner dynein arm-f (Dynein-f) complex driving microtubule sliding in motile cilia and sperm flagella [#0, #3]. It assembles into Dynein-f by associating with the intermediate chains WDR78 (IC138 orthologue) and WDR63 (IC140 orthologue), an interaction required for axonemal localization of the complex; depletion of DNAH2 or its partners paralyzes ciliary beat [#2]. DNAH2 is essential for sperm flagellum biogenesis: loss of DNAH2 in human patients and Dnah2-null mice produces inner dynein arm absence, central-pair loss, severely disorganized flagellar ultrastructure, and compromised assembly of other axonemal components (DNAH1, RSPH3), manifesting as the multiple morphological abnormalities of the flagella (MMAF) phenotype and male infertility [#1, #4, #5]. Bi-allelic DNAH2 variants are a cause of human MMAF-associated male infertility [#1, #5]. Proper incorporation of DNAH2 into the flagellar compartment depends on CEP76-mediated transition zone gating, since CEP76 loss causes DNAH2 to accumulate at the sperm neck rather than the tail [#8]. Beyond its axonemal role, DNAH2 promotes homologous recombination repair in the Fanconi anemia pathway by facilitating FANCD2 ubiquitination and its recruitment to DNA damage sites [#6].\",\n  \"teleology\": [\n    {\n      \"year\": 2014,\n      \"claim\": \"Established that DNAH2 is a major axonemal component of cilia and flagella involved in microtubule sliding, providing the first functional placement of the protein.\",\n      \"evidence\": \"ELISA cross-reactivity of the VE1 antibody with DNAH2 epitopes plus sequence homology analysis\",\n      \"pmids\": [\"25412847\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Inference of motor function rests on antibody cross-reactivity and homology, not direct motility assay\", \"No localization to a specific dynein arm subtype shown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Resolved which axonemal compartment DNAH2 occupies, placing it specifically in the inner dynein arm rather than the outer arm.\",\n      \"evidence\": \"Immunofluorescence and immunoblot on human sperm from DNAH17 (ODA)-mutant patients\",\n      \"pmids\": [\"31178125\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, correlative localization\", \"Does not define the molecular subcomplex DNAH2 belongs to\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined DNAH2's molecular complex by showing it forms Dynein-f with intermediate chains WDR78 and WDR63 and that this assembly is required for ciliary motility.\",\n      \"evidence\": \"Co-immunoprecipitation plus RNAi/morpholino knockdown in mouse ependymal cells and zebrafish with ciliary beat analysis\",\n      \"pmids\": [\"30060180\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structural architecture of Dynein-f not resolved\", \"Direct ATPase/motor activity of DNAH2 not measured\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Linked DNAH2 loss-of-function to human disease, establishing it as a cause of MMAF with absent inner dynein arms.\",\n      \"evidence\": \"Whole-exome sequencing, TEM ultrastructure, and immunofluorescence on patient sperm\",\n      \"pmids\": [\"30811583\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causality not confirmed by genetic rescue\", \"Mechanism connecting DNAH2 loss to broader axonemal disarray unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Confirmed in vivo requirement for DNAH2 in flagellogenesis and showed it influences centriolar, annulus, and other axonemal protein organization.\",\n      \"evidence\": \"CRISPR/Cas9 Dnah2-null mice with SEM/TEM, immunofluorescence, and Western blot; bi-allelic patient variants with TEM showing central-pair and IDA loss\",\n      \"pmids\": [\"33968937\", \"33771466\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How DNAH2 loss causes central-pair absence is not mechanistically explained\", \"Order of assembly events upstream/downstream of DNAH2 undefined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified an unexpected non-axonemal role for DNAH2 in DNA repair, placing it in the Fanconi anemia homologous recombination pathway.\",\n      \"evidence\": \"HR repair assay, mitomycin C sensitivity, FANCD2 immunofluorescence, and ubiquitination assays in U2OS/DR-U2OS cells\",\n      \"pmids\": [\"35402838\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct physical interaction of DNAH2 with FANCD2 or the FA core complex not shown\", \"Mechanism by which a dynein heavy chain promotes FANCD2 ubiquitination unknown\", \"Single lab, not independently replicated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed DNAH2 axonemal localization depends on the dynein regulatory complex assembly factor CCDC40.\",\n      \"evidence\": \"Immunofluorescence on respiratory cilia and sperm from a CCDC40-mutant PCD patient\",\n      \"pmids\": [\"35449766\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single patient case with one method\", \"No direct manipulation of DNAH2\", \"Correlative loss does not prove direct dependency\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined how DNAH2 reaches the flagellar compartment, implicating CEP76-mediated transition zone gating in its trafficking.\",\n      \"evidence\": \"Cep76-mutant mouse with immunofluorescence localization of DNAH2 in sperm\",\n      \"pmids\": [\"38570187\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct interaction between CEP76 and DNAH2 not demonstrated\", \"Whether gating is selective for DNAH2 versus general cargo unclear\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Distinguished DNAH2 assembly dependencies from other IDA subtypes, showing it is preserved in ZMYND10-related PCD.\",\n      \"evidence\": \"Immunofluorescence on respiratory cilia from a ZMYND10-mutant PCD patient\",\n      \"pmids\": [\"42180707\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single patient case, single method\", \"No quantification or functional readout\"]\n    },\n    {\n      \"year\": 2028,\n      \"claim\": \"Proposed a link between DNAH2 and SHH signaling and a female reproductive phenotype, extending DNAH2 function beyond sperm.\",\n      \"evidence\": \"Dnah2-null mice and siRNA silencing in hMSCs with Western blot for SMO/GLI2\",\n      \"pmids\": [\"42228139\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Preliminary single-lab study with small sample\", \"Mechanistic link between DNAH2 and SHH pathway proteins not established\", \"SHH connection not independently corroborated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The direct motor/ATPase activity of DNAH2, the structural architecture of the Dynein-f complex, and the molecular basis of its non-axonemal role in FANCD2-dependent DNA repair remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No biochemical reconstitution of DNAH2 motor activity\", \"No structural model of Dynein-f\", \"Mechanism connecting a dynein heavy chain to Fanconi anemia repair unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003774\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 2, 7]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [1, 4, 5]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"complexes\": [\n      \"Dynein-f (inner dynein arm-f)\"\n    ],\n    \"partners\": [\n      \"WDR78\",\n      \"WDR63\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}