{"gene":"DNAH7","run_date":"2026-04-28T17:46:02","timeline":{"discoveries":[{"year":2002,"finding":"DNAH7 is an inner dynein arm heavy chain component of human respiratory cilia axonemes. It is synthesized during ciliated cell differentiation but fails to assemble into cilia in a case of primary ciliary dyskinesia (PCD) with absent inner dynein arms, as shown by gel electrophoresis of isolated cilia, mass spectrometry identification, and immunohistochemistry.","method":"Gel electrophoresis of cilia proteins, mass spectrometry, immunohistochemistry, cDNA cloning","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — original identification via MS + IHC + functional context (PCD patient cilia), replicated by subsequent studies","pmids":["11877439"],"is_preprint":false},{"year":2014,"finding":"Dnah7 knockdown in zebrafish Kupffer's vesicle produces immotile cilia, reducing directional fluid flow and disrupting left-right organ laterality, establishing DNAH7 as required for motile cilia-driven left-right patterning. Mosaic organizers with varying numbers of dnah7 morphant (immotile) and wild-type (motile) cilia revealed that ~30 or more motile cilia are needed for robust asymmetric Charon expression and situs solitus.","method":"Zebrafish dnah7 morpholino knockdown, live imaging of cilia motility, fluid dynamics simulation, in situ hybridization for charon expression","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — genetic loss-of-function with defined ciliary motility phenotype, multiple complementary methods including imaging and simulation","pmids":["24930722"],"is_preprint":false},{"year":2021,"finding":"Biallelic mutations in DNAH7 in human patients with asthenozoospermia cause specific loss of inner dynein arms (IDAs) in sperm flagellar axonemes, impairing axoneme integrity and sperm motility, without affecting outer dynein arms.","method":"Whole-exome sequencing, transmission electron microscopy of sperm axonemes, immunofluorescence staining of sperm","journal":"Acta biochimica et biophysica Sinica","confidence":"High","confidence_rationale":"Tier 2 — human loss-of-function variants with TEM ultrastructural phenotype and IF confirmation, replicated in multiple subsequent studies","pmids":["34476482"],"is_preprint":false},{"year":2022,"finding":"DNAH7 disruption in a human patient causes loss of inner dynein arms in sperm flagella axonemes and leads to detachment/dispersal of mitochondria outside the axoneme, causing abnormalities in the mitochondrial sheath of the sperm mid-piece and male infertility.","method":"Whole-exome sequencing, transmission electron microscopy, immunofluorescence","journal":"Clinical genetics","confidence":"High","confidence_rationale":"Tier 2 — human loss-of-function with TEM ultrastructural and IF evidence, extends axoneme phenotype to mitochondrial sheath assembly","pmids":["35543642"],"is_preprint":false},{"year":2020,"finding":"TBC1D21 physically co-localizes with DNAH7 in the sperm tail axoneme in vivo, and loss of Tbc1d21 in mice causes DNAH7 to detach and disperse outside the axoneme, indicating TBC1D21 is required for proper axonemal localization of DNAH7.","method":"Proteomic analysis, immunofluorescence co-localization in mouse sperm, Tbc1d21 knockout mouse model","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2-3 — in vivo co-localization and KO phenotype, but no direct biochemical interaction (Co-IP) shown for DNAH7 specifically","pmids":["32976492"],"is_preprint":false},{"year":2023,"finding":"DNALI1 loss in humans and mice causes absence of DNAH7 (and DNAH1 but not DNAH10) from sperm flagella IDAs, demonstrating that DNALI1 is a light intermediate chain of a specific IDA subspecies that contains DNAH7, and that DNALI1 is required for DNAH7 assembly into the flagellar axoneme.","method":"Human patient with DNALI1 bi-allelic mutation, Dnali1 knockout mice, western blot, immunofluorescence, immunoprecipitation","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 1-2 — orthogonal methods (KO mouse + human patient + IF + Co-IP) establish DNAH7 as part of a specific DNALI1-containing IDA subspecies","pmids":["36792588"],"is_preprint":false},{"year":2024,"finding":"CCDC39 and CCDC40 (components of the 96 nm axonemal ruler complex) are required for assembly of IDA heavy chains DNAH1, DNAH6, and DNAH7 into respiratory ciliary axonemes; disease-causing biallelic variants in CCDC39/CCDC40 result in conspicuous absence of DNAH7 from respiratory cilia, indicating DNAH7 belongs to centrin2 (CETN2)-containing IDAs whose assembly depends on the molecular ruler.","method":"Next-generation sequencing (cohort of 51 PCD patients), immunofluorescence analysis of respiratory cilia","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2-3 — large patient cohort with IF evidence, but localization study without direct biochemical reconstitution","pmids":["39056782"],"is_preprint":false},{"year":2025,"finding":"IQUB deficiency causes RS1 (radial spoke 1) defects in sperm flagella and leads to significant downregulation of IDA components DNAH7 and DNAH12, indicating that DNAH7-containing IDAs are spatially proximal to RS1 and their stability or assembly is dependent on intact RS1.","method":"Human patient WES, Iqub-/- mice, protein mass spectrometry, western blotting, electron microscopy","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 2 — dual-species (human + mouse) KO with MS and WB, but DNAH7 reduction is a secondary consequence; indirect mechanistic link","pmids":["39849482"],"is_preprint":false},{"year":2014,"finding":"The BRAF VE1 antibody cross-reacts with epitopes in axonemal dynein heavy chain proteins including DNAH7 in cilia and flagella, as demonstrated by ELISA showing VE1 antibody recognition of DNAH7-derived epitopes, confirming DNAH7 is a major axonemal protein in cilia of bronchial airways, fallopian tubes, and sperm flagella.","method":"ELISA, immunohistochemistry, sequence homology analysis","journal":"Modern pathology","confidence":"Medium","confidence_rationale":"Tier 2-3 — ELISA confirmation of antibody epitope recognition, corroborates DNAH7 localization in cilia/flagella","pmids":["25412847"],"is_preprint":false},{"year":2019,"finding":"In a PCD patient with Kartagener syndrome, two novel missense variants in DNAH7 together with disease-causing variants in DNAH5 led to protein mislocalization of DNAH7 and reduced DNAH7 gene expression in respiratory cilia, suggesting potential digenic interaction modulating the PCD phenotype.","method":"Whole-exome sequencing, transmission electron microscopy, functional gene expression and protein localization analysis","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2-3 — functional protein mislocalization data in patient, but single case with possible confounding DNAH5 variants","pmids":["31443223"],"is_preprint":false},{"year":2025,"finding":"Biallelic loss-of-function variants in DNAH7 cause selective loss of inner dynein arms (IDAs) in human sperm flagella, with co-reduction of IDA-associated proteins DNAH3 and DNAH6, but no effect on outer dynein arm proteins (DNAH8, DNAH11, DNAH17, DNAI1), demonstrating DNAH7 is specifically required for IDA assembly in human sperm flagella.","method":"Whole-exome sequencing, transmission electron microscopy, immunofluorescence staining of spermatozoa","journal":"Human genetics","confidence":"High","confidence_rationale":"Tier 2 — human LOF variants with TEM ultrastructure and IF specificity for IDA vs ODA components, consistent with multiple prior studies","pmids":["40810911"],"is_preprint":false}],"current_model":"DNAH7 is an axonemal inner dynein arm (IDA) heavy chain that localizes to the motile cilia of respiratory epithelium and to sperm flagella, where it is required for IDA assembly and axonemal integrity; loss of DNAH7 causes selective absence of IDAs (while outer dynein arms are spared), impairing ciliary beat and flagellar motility, leading to primary ciliary dyskinesia, laterality defects, and asthenozoospermia, with its axonemal assembly dependent on accessory proteins including DNALI1 (a cognate IDA light intermediate chain) and the CCDC39/CCDC40 molecular ruler complex."},"narrative":{"teleology":[{"year":2002,"claim":"Identification of DNAH7 as an inner dynein arm heavy chain of human respiratory cilia resolved the molecular identity of IDA components in human motile cilia and linked IDA assembly failure to primary ciliary dyskinesia.","evidence":"Mass spectrometry of isolated cilia proteins, immunohistochemistry, and cDNA cloning from human ciliated epithelium and a PCD patient","pmids":["11877439"],"confidence":"High","gaps":["No causative mutation in DNAH7 identified in this patient","Mechanism of IDA assembly failure not determined","Expression in non-respiratory motile cilia not assessed"]},{"year":2014,"claim":"Zebrafish knockdown established that DNAH7 is required for cilia motility and left-right patterning, moving understanding from correlative loss in PCD to a causal requirement in embryonic symmetry breaking.","evidence":"Morpholino knockdown of dnah7 in zebrafish Kupffer's vesicle with live cilia imaging, fluid dynamics simulation, and in situ hybridization","pmids":["24930722"],"confidence":"High","gaps":["Morpholino knockdown rather than stable genetic mutant","No ultrastructural confirmation of IDA loss in zebrafish","Mammalian in vivo requirement not yet tested"]},{"year":2019,"claim":"Discovery of DNAH7 missense variants causing protein mislocalization in a PCD patient with DNAH5 co-mutations raised the possibility of digenic contributions, though the isolated effect of DNAH7 variants remained unclear.","evidence":"Whole-exome sequencing, TEM, and protein localization analysis in a Kartagener syndrome patient","pmids":["31443223"],"confidence":"Medium","gaps":["Confounding DNAH5 variants preclude attribution of phenotype solely to DNAH7","Single patient, not independently replicated","No functional rescue experiment"]},{"year":2020,"claim":"Identification of TBC1D21 as required for DNAH7 axonemal retention in sperm provided the first evidence that accessory proteins regulate DNAH7 localization within the flagellar axoneme.","evidence":"Tbc1d21 knockout mice with immunofluorescence co-localization and proteomic analysis of sperm tails","pmids":["32976492"],"confidence":"Medium","gaps":["No direct biochemical interaction (e.g., Co-IP) between TBC1D21 and DNAH7 demonstrated","Mechanism by which TBC1D21 retains DNAH7 not determined","Not confirmed in human sperm"]},{"year":2021,"claim":"Biallelic DNAH7 mutations in asthenozoospermic men established DNAH7 as directly required for IDA assembly in human sperm flagella and demonstrated that ODA assembly is spared, defining the specificity of DNAH7 loss.","evidence":"Whole-exome sequencing, TEM, and immunofluorescence of sperm from infertile patients","pmids":["34476482"],"confidence":"High","gaps":["Rescue experiment not performed","Whether DNAH7 loss affects respiratory cilia in the same patients not examined","Structural position within the 96 nm repeat not mapped"]},{"year":2022,"claim":"Extending the flagellar phenotype, DNAH7 disruption was shown to cause mitochondrial sheath disorganization in the sperm mid-piece, revealing that IDA integrity influences extra-axonemal structures.","evidence":"TEM and immunofluorescence of sperm from a patient with biallelic DNAH7 disruption","pmids":["35543642"],"confidence":"High","gaps":["Whether mitochondrial detachment is a direct or secondary consequence of IDA loss is unknown","Mechanism linking axoneme defects to mitochondrial sheath not characterized"]},{"year":2023,"claim":"DNALI1 was identified as the cognate light intermediate chain of a DNAH7-containing IDA subspecies, establishing the subunit composition of the specific IDA complex that DNAH7 occupies and showing DNALI1 is required for DNAH7 axonemal assembly.","evidence":"Human patient with DNALI1 biallelic mutation, Dnali1 knockout mice, immunoprecipitation, western blot, and immunofluorescence","pmids":["36792588"],"confidence":"High","gaps":["Full stoichiometry and additional subunits of the DNAH7/DNALI1 IDA complex not determined","No structural data for the complex","Whether DNAH1 and DNAH7 occupy the same or distinct IDA subtypes not fully resolved"]},{"year":2024,"claim":"The CCDC39/CCDC40 molecular ruler complex was shown to be required for DNAH7 assembly into respiratory ciliary axonemes, placing DNAH7-containing IDAs under the organizational control of the 96 nm axonemal periodicity determinants.","evidence":"Immunofluorescence of respiratory cilia from a cohort of 51 PCD patients with biallelic CCDC39/CCDC40 variants","pmids":["39056782"],"confidence":"Medium","gaps":["No direct biochemical reconstitution of ruler-dependent IDA docking","Whether CCDC39/40 directly scaffold DNAH7 or act indirectly through intermediate structures is unknown"]},{"year":2025,"claim":"Loss of DNAH7 was shown to cause co-reduction of DNAH3 and DNAH6 while sparing all ODA heavy chains, defining a DNAH7-dependent IDA sub-complex and suggesting a scaffold function; separately, IQUB/RS1 deficiency was linked to DNAH7 downregulation, connecting radial spoke integrity to IDA stability.","evidence":"Human WES and IF/TEM of sperm (DNAH7 study); human WES and Iqub−/− mice with MS, WB, and EM (IQUB study)","pmids":["40810911","39849482"],"confidence":"High","gaps":["Whether DNAH7, DNAH3, and DNAH6 form a single complex or are co-dependent but separate IDAs is unresolved","The physical basis for RS1-IDA coupling is unknown","No cryo-EM or crystal structure of the DNAH7-containing IDA"]},{"year":null,"claim":"The precise position of the DNAH7-containing IDA within the 96 nm axonemal repeat, its full subunit composition, and the structural basis for its motor activity and interactions with the molecular ruler and radial spokes remain undefined.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No high-resolution structure of the DNAH7-containing IDA complex","ATPase/motor activity of DNAH7 not directly measured","No conditional or tissue-specific knockout model in mammals"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003774","term_label":"cytoskeletal motor activity","supporting_discovery_ids":[0,1,2]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,1,2,3,5,6,8,10]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,5,6]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[2,3,10]}],"complexes":["inner dynein arm (IDA) subspecies with DNALI1"],"partners":["DNALI1","CCDC39","CCDC40","TBC1D21","DNAH3","DNAH6"],"other_free_text":[]},"mechanistic_narrative":"DNAH7 is an axonemal inner dynein arm (IDA) heavy chain essential for motile cilia beat and sperm flagellar motility. It is synthesized during ciliated cell differentiation, assembles into ciliary and flagellar axonemes as part of a specific IDA subspecies that includes the light intermediate chain DNALI1, and its axonemal incorporation depends on the CCDC39/CCDC40 molecular ruler complex and intact radial spoke 1 structures [PMID:11877439, PMID:36792588, PMID:39056782, PMID:39849482]. Biallelic loss-of-function mutations in DNAH7 cause selective absence of IDAs—without affecting outer dynein arms—leading to primary ciliary dyskinesia with laterality defects, and to asthenozoospermia with disrupted mitochondrial sheath assembly in the sperm mid-piece [PMID:34476482, PMID:35543642, PMID:24930722, PMID:40810911]. Loss of DNAH7 also causes co-reduction of fellow IDA heavy chains DNAH3 and DNAH6, indicating it serves a structural scaffold role within the IDA complex [PMID:40810911]."},"prefetch_data":{"uniprot":{"accession":"Q8WXX0","full_name":"Dynein axonemal heavy chain 7","aliases":["Axonemal beta dynein heavy chain 7","Ciliary dynein heavy chain 7","Dynein heavy chain-like protein 2","hDHC2"],"length_aa":4024,"mass_kda":461.2,"function":"Force generating protein that plays an important role in respiratory cilia and sperm flagella beating (PubMed:34476482). 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 (By similarity)","subcellular_location":"Cytoplasm, cytoskeleton, cilium axoneme; Cell projection, cilium, flagellum","url":"https://www.uniprot.org/uniprotkb/Q8WXX0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DNAH7","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DNAH7","total_profiled":1310},"omim":[{"mim_id":"620387","title":"TBC1 DOMAIN FAMILY, MEMBER 21; TBC1D21","url":"https://www.omim.org/entry/620387"},{"mim_id":"620356","title":"CILIARY DYSKINESIA, PRIMARY, 50; CILD50","url":"https://www.omim.org/entry/620356"},{"mim_id":"620354","title":"SPERMATOGENIC FAILURE 83; SPGF83","url":"https://www.omim.org/entry/620354"},{"mim_id":"610061","title":"DYNEIN, AXONEMAL, HEAVY CHAIN 7; DNAH7","url":"https://www.omim.org/entry/610061"},{"mim_id":"602135","title":"DYNEIN, AXONEMAL, LIGHT INTERMEDIATE POLYPEPTIDE 1; DNALI1","url":"https://www.omim.org/entry/602135"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Mid piece","reliability":"Supported"},{"location":"Annulus","reliability":"Supported"},{"location":"Vesicles","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"choroid plexus","ntpm":19.8},{"tissue":"testis","ntpm":10.3}],"url":"https://www.proteinatlas.org/search/DNAH7"},"hgnc":{"alias_symbol":["KIAA0944"],"prev_symbol":[]},"alphafold":{"accession":"Q8WXX0","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8WXX0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8WXX0-4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8WXX0-4-F1-predicted_aligned_error_v6.png","plddt_mean":65.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DNAH7","jax_strain_url":"https://www.jax.org/strain/search?query=DNAH7"},"sequence":{"accession":"Q8WXX0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8WXX0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8WXX0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8WXX0"}},"corpus_meta":[{"pmid":"33536081","id":"PMC_33536081","title":"Genetic variants are identified to increase risk of COVID-19 related mortality from UK Biobank 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Part D, Genomics & proteomics","url":"https://pubmed.ncbi.nlm.nih.gov/40694934","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":17596,"output_tokens":2693,"usd":0.046592},"stage2":{"model":"claude-opus-4-6","input_tokens":6018,"output_tokens":2472,"usd":0.137835},"total_usd":0.184427,"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\": 2002,\n      \"finding\": \"DNAH7 is an inner dynein arm heavy chain component of human respiratory cilia axonemes. It is synthesized during ciliated cell differentiation but fails to assemble into cilia in a case of primary ciliary dyskinesia (PCD) with absent inner dynein arms, as shown by gel electrophoresis of isolated cilia, mass spectrometry identification, and immunohistochemistry.\",\n      \"method\": \"Gel electrophoresis of cilia proteins, mass spectrometry, immunohistochemistry, cDNA cloning\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — original identification via MS + IHC + functional context (PCD patient cilia), replicated by subsequent studies\",\n      \"pmids\": [\"11877439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Dnah7 knockdown in zebrafish Kupffer's vesicle produces immotile cilia, reducing directional fluid flow and disrupting left-right organ laterality, establishing DNAH7 as required for motile cilia-driven left-right patterning. Mosaic organizers with varying numbers of dnah7 morphant (immotile) and wild-type (motile) cilia revealed that ~30 or more motile cilia are needed for robust asymmetric Charon expression and situs solitus.\",\n      \"method\": \"Zebrafish dnah7 morpholino knockdown, live imaging of cilia motility, fluid dynamics simulation, in situ hybridization for charon expression\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic loss-of-function with defined ciliary motility phenotype, multiple complementary methods including imaging and simulation\",\n      \"pmids\": [\"24930722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Biallelic mutations in DNAH7 in human patients with asthenozoospermia cause specific loss of inner dynein arms (IDAs) in sperm flagellar axonemes, impairing axoneme integrity and sperm motility, without affecting outer dynein arms.\",\n      \"method\": \"Whole-exome sequencing, transmission electron microscopy of sperm axonemes, immunofluorescence staining of sperm\",\n      \"journal\": \"Acta biochimica et biophysica Sinica\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human loss-of-function variants with TEM ultrastructural phenotype and IF confirmation, replicated in multiple subsequent studies\",\n      \"pmids\": [\"34476482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DNAH7 disruption in a human patient causes loss of inner dynein arms in sperm flagella axonemes and leads to detachment/dispersal of mitochondria outside the axoneme, causing abnormalities in the mitochondrial sheath of the sperm mid-piece and male infertility.\",\n      \"method\": \"Whole-exome sequencing, transmission electron microscopy, immunofluorescence\",\n      \"journal\": \"Clinical genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human loss-of-function with TEM ultrastructural and IF evidence, extends axoneme phenotype to mitochondrial sheath assembly\",\n      \"pmids\": [\"35543642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TBC1D21 physically co-localizes with DNAH7 in the sperm tail axoneme in vivo, and loss of Tbc1d21 in mice causes DNAH7 to detach and disperse outside the axoneme, indicating TBC1D21 is required for proper axonemal localization of DNAH7.\",\n      \"method\": \"Proteomic analysis, immunofluorescence co-localization in mouse sperm, Tbc1d21 knockout mouse model\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — in vivo co-localization and KO phenotype, but no direct biochemical interaction (Co-IP) shown for DNAH7 specifically\",\n      \"pmids\": [\"32976492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DNALI1 loss in humans and mice causes absence of DNAH7 (and DNAH1 but not DNAH10) from sperm flagella IDAs, demonstrating that DNALI1 is a light intermediate chain of a specific IDA subspecies that contains DNAH7, and that DNALI1 is required for DNAH7 assembly into the flagellar axoneme.\",\n      \"method\": \"Human patient with DNALI1 bi-allelic mutation, Dnali1 knockout mice, western blot, immunofluorescence, immunoprecipitation\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — orthogonal methods (KO mouse + human patient + IF + Co-IP) establish DNAH7 as part of a specific DNALI1-containing IDA subspecies\",\n      \"pmids\": [\"36792588\"],\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 assembly of IDA heavy chains DNAH1, DNAH6, and DNAH7 into respiratory ciliary axonemes; disease-causing biallelic variants in CCDC39/CCDC40 result in conspicuous absence of DNAH7 from respiratory cilia, indicating DNAH7 belongs to centrin2 (CETN2)-containing IDAs whose assembly depends on the molecular ruler.\",\n      \"method\": \"Next-generation sequencing (cohort of 51 PCD patients), immunofluorescence analysis of respiratory cilia\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — large patient cohort with IF evidence, but localization study without direct biochemical reconstitution\",\n      \"pmids\": [\"39056782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"IQUB deficiency causes RS1 (radial spoke 1) defects in sperm flagella and leads to significant downregulation of IDA components DNAH7 and DNAH12, indicating that DNAH7-containing IDAs are spatially proximal to RS1 and their stability or assembly is dependent on intact RS1.\",\n      \"method\": \"Human patient WES, Iqub-/- mice, protein mass spectrometry, western blotting, electron microscopy\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — dual-species (human + mouse) KO with MS and WB, but DNAH7 reduction is a secondary consequence; indirect mechanistic link\",\n      \"pmids\": [\"39849482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The BRAF VE1 antibody cross-reacts with epitopes in axonemal dynein heavy chain proteins including DNAH7 in cilia and flagella, as demonstrated by ELISA showing VE1 antibody recognition of DNAH7-derived epitopes, confirming DNAH7 is a major axonemal protein in cilia of bronchial airways, fallopian tubes, and sperm flagella.\",\n      \"method\": \"ELISA, immunohistochemistry, sequence homology analysis\",\n      \"journal\": \"Modern pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — ELISA confirmation of antibody epitope recognition, corroborates DNAH7 localization in cilia/flagella\",\n      \"pmids\": [\"25412847\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In a PCD patient with Kartagener syndrome, two novel missense variants in DNAH7 together with disease-causing variants in DNAH5 led to protein mislocalization of DNAH7 and reduced DNAH7 gene expression in respiratory cilia, suggesting potential digenic interaction modulating the PCD phenotype.\",\n      \"method\": \"Whole-exome sequencing, transmission electron microscopy, functional gene expression and protein localization analysis\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — functional protein mislocalization data in patient, but single case with possible confounding DNAH5 variants\",\n      \"pmids\": [\"31443223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Biallelic loss-of-function variants in DNAH7 cause selective loss of inner dynein arms (IDAs) in human sperm flagella, with co-reduction of IDA-associated proteins DNAH3 and DNAH6, but no effect on outer dynein arm proteins (DNAH8, DNAH11, DNAH17, DNAI1), demonstrating DNAH7 is specifically required for IDA assembly in human sperm flagella.\",\n      \"method\": \"Whole-exome sequencing, transmission electron microscopy, immunofluorescence staining of spermatozoa\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human LOF variants with TEM ultrastructure and IF specificity for IDA vs ODA components, consistent with multiple prior studies\",\n      \"pmids\": [\"40810911\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DNAH7 is an axonemal inner dynein arm (IDA) heavy chain that localizes to the motile cilia of respiratory epithelium and to sperm flagella, where it is required for IDA assembly and axonemal integrity; loss of DNAH7 causes selective absence of IDAs (while outer dynein arms are spared), impairing ciliary beat and flagellar motility, leading to primary ciliary dyskinesia, laterality defects, and asthenozoospermia, with its axonemal assembly dependent on accessory proteins including DNALI1 (a cognate IDA light intermediate chain) and the CCDC39/CCDC40 molecular ruler complex.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"DNAH7 is an axonemal inner dynein arm (IDA) heavy chain essential for motile cilia beat and sperm flagellar motility. It is synthesized during ciliated cell differentiation, assembles into ciliary and flagellar axonemes as part of a specific IDA subspecies that includes the light intermediate chain DNALI1, and its axonemal incorporation depends on the CCDC39/CCDC40 molecular ruler complex and intact radial spoke 1 structures [PMID:11877439, PMID:36792588, PMID:39056782, PMID:39849482]. Biallelic loss-of-function mutations in DNAH7 cause selective absence of IDAs—without affecting outer dynein arms—leading to primary ciliary dyskinesia with laterality defects, and to asthenozoospermia with disrupted mitochondrial sheath assembly in the sperm mid-piece [PMID:34476482, PMID:35543642, PMID:24930722, PMID:40810911]. Loss of DNAH7 also causes co-reduction of fellow IDA heavy chains DNAH3 and DNAH6, indicating it serves a structural scaffold role within the IDA complex [PMID:40810911].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Identification of DNAH7 as an inner dynein arm heavy chain of human respiratory cilia resolved the molecular identity of IDA components in human motile cilia and linked IDA assembly failure to primary ciliary dyskinesia.\",\n      \"evidence\": \"Mass spectrometry of isolated cilia proteins, immunohistochemistry, and cDNA cloning from human ciliated epithelium and a PCD patient\",\n      \"pmids\": [\"11877439\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No causative mutation in DNAH7 identified in this patient\", \"Mechanism of IDA assembly failure not determined\", \"Expression in non-respiratory motile cilia not assessed\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Zebrafish knockdown established that DNAH7 is required for cilia motility and left-right patterning, moving understanding from correlative loss in PCD to a causal requirement in embryonic symmetry breaking.\",\n      \"evidence\": \"Morpholino knockdown of dnah7 in zebrafish Kupffer's vesicle with live cilia imaging, fluid dynamics simulation, and in situ hybridization\",\n      \"pmids\": [\"24930722\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Morpholino knockdown rather than stable genetic mutant\", \"No ultrastructural confirmation of IDA loss in zebrafish\", \"Mammalian in vivo requirement not yet tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Discovery of DNAH7 missense variants causing protein mislocalization in a PCD patient with DNAH5 co-mutations raised the possibility of digenic contributions, though the isolated effect of DNAH7 variants remained unclear.\",\n      \"evidence\": \"Whole-exome sequencing, TEM, and protein localization analysis in a Kartagener syndrome patient\",\n      \"pmids\": [\"31443223\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Confounding DNAH5 variants preclude attribution of phenotype solely to DNAH7\", \"Single patient, not independently replicated\", \"No functional rescue experiment\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identification of TBC1D21 as required for DNAH7 axonemal retention in sperm provided the first evidence that accessory proteins regulate DNAH7 localization within the flagellar axoneme.\",\n      \"evidence\": \"Tbc1d21 knockout mice with immunofluorescence co-localization and proteomic analysis of sperm tails\",\n      \"pmids\": [\"32976492\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct biochemical interaction (e.g., Co-IP) between TBC1D21 and DNAH7 demonstrated\", \"Mechanism by which TBC1D21 retains DNAH7 not determined\", \"Not confirmed in human sperm\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Biallelic DNAH7 mutations in asthenozoospermic men established DNAH7 as directly required for IDA assembly in human sperm flagella and demonstrated that ODA assembly is spared, defining the specificity of DNAH7 loss.\",\n      \"evidence\": \"Whole-exome sequencing, TEM, and immunofluorescence of sperm from infertile patients\",\n      \"pmids\": [\"34476482\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Rescue experiment not performed\", \"Whether DNAH7 loss affects respiratory cilia in the same patients not examined\", \"Structural position within the 96 nm repeat not mapped\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extending the flagellar phenotype, DNAH7 disruption was shown to cause mitochondrial sheath disorganization in the sperm mid-piece, revealing that IDA integrity influences extra-axonemal structures.\",\n      \"evidence\": \"TEM and immunofluorescence of sperm from a patient with biallelic DNAH7 disruption\",\n      \"pmids\": [\"35543642\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether mitochondrial detachment is a direct or secondary consequence of IDA loss is unknown\", \"Mechanism linking axoneme defects to mitochondrial sheath not characterized\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"DNALI1 was identified as the cognate light intermediate chain of a DNAH7-containing IDA subspecies, establishing the subunit composition of the specific IDA complex that DNAH7 occupies and showing DNALI1 is required for DNAH7 axonemal assembly.\",\n      \"evidence\": \"Human patient with DNALI1 biallelic mutation, Dnali1 knockout mice, immunoprecipitation, western blot, and immunofluorescence\",\n      \"pmids\": [\"36792588\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full stoichiometry and additional subunits of the DNAH7/DNALI1 IDA complex not determined\", \"No structural data for the complex\", \"Whether DNAH1 and DNAH7 occupy the same or distinct IDA subtypes not fully resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"The CCDC39/CCDC40 molecular ruler complex was shown to be required for DNAH7 assembly into respiratory ciliary axonemes, placing DNAH7-containing IDAs under the organizational control of the 96 nm axonemal periodicity determinants.\",\n      \"evidence\": \"Immunofluorescence of respiratory cilia from a cohort of 51 PCD patients with biallelic CCDC39/CCDC40 variants\",\n      \"pmids\": [\"39056782\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct biochemical reconstitution of ruler-dependent IDA docking\", \"Whether CCDC39/40 directly scaffold DNAH7 or act indirectly through intermediate structures is unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Loss of DNAH7 was shown to cause co-reduction of DNAH3 and DNAH6 while sparing all ODA heavy chains, defining a DNAH7-dependent IDA sub-complex and suggesting a scaffold function; separately, IQUB/RS1 deficiency was linked to DNAH7 downregulation, connecting radial spoke integrity to IDA stability.\",\n      \"evidence\": \"Human WES and IF/TEM of sperm (DNAH7 study); human WES and Iqub−/− mice with MS, WB, and EM (IQUB study)\",\n      \"pmids\": [\"40810911\", \"39849482\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether DNAH7, DNAH3, and DNAH6 form a single complex or are co-dependent but separate IDAs is unresolved\", \"The physical basis for RS1-IDA coupling is unknown\", \"No cryo-EM or crystal structure of the DNAH7-containing IDA\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The precise position of the DNAH7-containing IDA within the 96 nm axonemal repeat, its full subunit composition, and the structural basis for its motor activity and interactions with the molecular ruler and radial spokes remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No high-resolution structure of the DNAH7-containing IDA complex\", \"ATPase/motor activity of DNAH7 not directly measured\", \"No conditional or tissue-specific knockout model in mammals\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003774\", \"supporting_discovery_ids\": [0, 1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 1, 2, 3, 5, 6, 8, 10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 5, 6]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [2, 3, 10]}\n    ],\n    \"complexes\": [\n      \"inner dynein arm (IDA) subspecies with DNALI1\"\n    ],\n    \"partners\": [\n      \"DNALI1\",\n      \"CCDC39\",\n      \"CCDC40\",\n      \"TBC1D21\",\n      \"DNAH3\",\n      \"DNAH6\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}