{"gene":"DNAH7","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2002,"finding":"DNAH7 was identified as a component of the inner dynein arm of human respiratory cilia. Mass spectrometry of cilia proteins from normal versus primary ciliary dyskinesia (PCD) cells identified DNAH7 as absent in PCD cilia. DNAH7 shares 68% similarity with an inner arm dynein heavy chain from Drosophila. In PCD cells lacking inner dynein arms by electron microscopy, DNAH7 protein was synthesized intracellularly but failed to assemble into cilia.","method":"Gel electrophoresis and mass spectrometry of purified cilia proteins; immunohistochemistry; cDNA cloning; comparison of normal vs. PCD bronchial epithelial cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — mass spectrometry identification of protein absence, immunohistochemistry localization, cDNA cloning, orthogonal methods in a single focused study establishing IDA localization and assembly defect","pmids":["11877439"],"is_preprint":false},{"year":2014,"finding":"Zebrafish dnah7 knockdown (morphant) generated mosaic left-right organizers with reduced motile cilia numbers, demonstrating that dnah7-dependent cilia motility is required for directional fluid flow in Kupffer's vesicle and thereby for correct left-right organ laterality. Embryos with fewer motile cilia (due to dnah7 knockdown) showed reduced asymmetric charon expression and increased laterality randomization.","method":"Zebrafish dnah7 morpholino knockdown; live imaging of cilia motility and fluid flow; quantitative tracking of organ laterality; computational fluid dynamics simulation","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic knockdown with specific phenotypic readout (laterality), fluid dynamics imaging, replicated across multiple embryos with simulation validation","pmids":["24930722"],"is_preprint":false},{"year":2014,"finding":"The BRAF VE1 antibody cross-reacts with epitopes in DNAH7 (and other axonemal dynein heavy chains including DNAH2 and DNAH12). There is significant sequence homology between the VE1 immunizing peptide (BRAF V600E residues 596-606) and regions of DNAH7. This was confirmed by ELISA showing VE1 antibody recognition of DNAH7 epitopes, and explains VE1 staining of cilia in bronchial airways, fallopian tubes, and other ciliated structures.","method":"ELISA; sequence homology analysis; immunohistochemistry of ciliated tissues","journal":"Modern pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ELISA directly confirms antibody-epitope binding; sequence homology provides mechanistic basis; single lab but two orthogonal methods","pmids":["25412847"],"is_preprint":false},{"year":2021,"finding":"Bi-allelic mutations in DNAH7 in asthenozoospermia patients caused specific loss of inner dynein arms (IDAs) in sperm axonemes, with significantly decreased DNAH7 expression in spermatozoa. Outer dynein arm structure was preserved. Sperm motility was severely impaired but fertilization was achievable by ICSI.","method":"Whole-exome sequencing; transmission electron microscopy of sperm axonemes; immunofluorescence/protein expression analysis in patient spermatozoa","journal":"Acta biochimica et biophysica Sinica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — TEM ultrastructural analysis and immunofluorescence in human patients with loss-of-function variants; single lab, two orthogonal methods","pmids":["34476482"],"is_preprint":false},{"year":2022,"finding":"Loss-of-function mutation in DNAH7 in a human patient caused asthenozoospermia with multiple morphological abnormalities of sperm flagella. TEM revealed loss of inner dynein arms in sperm axonemes, and mitochondria of the sperm flagella detached and dispersed outside the axoneme, causing abnormalities in the mitochondrial sheath in the mid-piece region.","method":"Whole-exome sequencing; transmission electron microscopy; immunofluorescence of patient spermatozoa","journal":"Clinical genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — TEM and immunofluorescence on patient material with confirmed loss-of-function variant; single lab, two orthogonal methods","pmids":["35543642"],"is_preprint":false},{"year":2023,"finding":"DNALI1 deficiency in humans and mice caused loss of DNAH7 (and DNAH1) but not DNAH10 from sperm flagella, demonstrating that DNALI1 is a light intermediate chain of a partial IDA subspecies that includes DNAH7. Immunoprecipitation showed DNALI1 interacts with cytoplasmic dynein complex proteins in testes.","method":"Immunofluorescence of patient and Dnali1-/- mouse sperm; immunoprecipitation from testis lysates; western blotting","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal immunofluorescence and co-IP demonstrating DNAH7 as a component of the DNALI1-containing IDA subspecies; single lab, two orthogonal methods","pmids":["36792588"],"is_preprint":false},{"year":2024,"finding":"Disease-causing bi-allelic variants in CCDC39 and CCDC40 (which encode a molecular ruler complex maintaining 96 nm axonemal repeat units) cause conspicuous absence of IDA heavy chains DNAH1, DNAH6, and DNAH7 in respiratory ciliary axonemes, as shown by immunofluorescence. This places DNAH7-containing IDAs downstream of the CCDC39/CCDC40 ruler complex in ciliary axoneme assembly.","method":"Next-generation sequencing of 51 PCD patients with CCDC39/CCDC40 variants; immunofluorescence analysis of respiratory cilia","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — immunofluorescence across a cohort of 51 patients establishing epistatic relationship; single lab but large patient cohort","pmids":["39056782"],"is_preprint":false},{"year":2019,"finding":"In a PCD patient (Patient-2) with Kartagener syndrome showing absence of both dynein arms, two novel missense variants in DNAH7 were identified alongside disease-causing variants in DNAH5. Functional data showed reduced DNAH7 gene expression and protein mislocalization in Patient-2 cells, suggesting DNAH7 variants may modulate the PCD phenotype in combination with DNAH5 mutations.","method":"Whole-exome sequencing; transmission electron microscopy; RT-PCR; immunofluorescence for protein localization","journal":"Cells","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single patient case with compound genetic findings; DNAH7 contribution difficult to isolate from DNAH5 mutations; single lab","pmids":["31443223"],"is_preprint":false},{"year":2020,"finding":"TBC1D21 physically co-localizes with DNAH7 (an inner arm axoneme component) in mouse sperm in vivo, and in Tbc1d21-deficient sperm, DNAH7 detaches and disperses outside the axoneme instead of aligning with it, linking TBC1D21 to the correct assembly/retention of DNAH7 in the sperm axoneme.","method":"Co-immunofluorescence localization in mouse sperm; Tbc1d21 knockout mouse model; proteomic analysis of TBC1D21 interactors","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with specific axonemal mislocalization phenotype of DNAH7, supported by co-localization and proteomics; single lab, two orthogonal methods","pmids":["32976492"],"is_preprint":false},{"year":2025,"finding":"Biallelic loss-of-function variants in DNAH7 in two infertile men caused asthenozoospermia with severe IDA loss in sperm flagella. Immunofluorescence showed markedly reduced DNAH7 and other IDA-associated proteins (DNAH3, DNAH6) in patient spermatozoa, while ODA-associated proteins (DNAH8, DNAH11, DNAH17, DNAI1) were unaffected, confirming DNAH7 is specifically required for IDA assembly in human sperm flagella.","method":"Whole-exome sequencing; transmission electron microscopy; immunofluorescence of patient spermatozoa","journal":"Human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — TEM ultrastructural analysis and immunofluorescence with panel of IDA and ODA markers in confirmed loss-of-function patients; single lab, two orthogonal methods","pmids":["40810911"],"is_preprint":false},{"year":2025,"finding":"IQUB deficiency caused significant downregulation of DNAH7 (and DNAH12) in sperm flagella alongside radial spoke 1 (RS1) deficiency, establishing that DNAH7-containing IDAs are in close proximity to RS1 and their assembly or stability is dependent on intact RS1 structure.","method":"Whole-exome sequencing; protein mass spectrometry; western blotting; immunofluorescence in patient and Iqub-/- mouse sperm","journal":"Cell communication and signaling","confidence":"Low","confidence_rationale":"Tier 3 / Weak — DNAH7 downregulation is a secondary finding in an IQUB study; single lab, indirect evidence of spatial/functional relationship","pmids":["39849482"],"is_preprint":false}],"current_model":"DNAH7 is an inner dynein arm (IDA) heavy chain component of axonemal structures in both respiratory cilia and sperm flagella; it is synthesized in the cytoplasm but requires intact assembly machinery (including the CCDC39/CCDC40 molecular ruler complex and the IDA light intermediate chain DNALI1) for incorporation into the axoneme, and loss-of-function mutations cause selective IDA deficiency in sperm leading to asthenozoospermia, while in cilia its motility is required for directional fluid flow and correct left-right organ laterality."},"narrative":{"mechanistic_narrative":"DNAH7 is an inner dynein arm (IDA) heavy chain that powers the motility of both respiratory cilia and sperm flagella, where its activity drives directional fluid flow required for normal left-right organ laterality [PMID:11877439, PMID:24930722]. It was first identified as an IDA component of human respiratory cilia that is absent from primary ciliary dyskinesia cells lacking inner dynein arms; in these cells DNAH7 protein is synthesized in the cytoplasm but fails to assemble into the axoneme, establishing that its function depends on intact axonemal assembly machinery rather than on its own expression alone [PMID:11877439]. This assembly dependence is borne out by several upstream factors: the CCDC39/CCDC40 molecular ruler complex is required for incorporation of DNAH7-containing IDAs into respiratory axonemes [PMID:39056782], and in sperm flagella DNAH7 is a component of the IDA subspecies defined by the light intermediate chain DNALI1, whose loss strips DNAH7 from the flagellum [PMID:36792588]. Correct axonemal retention of DNAH7 in sperm additionally requires TBC1D21, in whose absence DNAH7 detaches and disperses outside the axoneme [PMID:32976492]. Bi-allelic loss-of-function mutations in DNAH7 cause asthenozoospermia with selective loss of inner dynein arms while outer dynein arm components are preserved, producing severely impaired sperm motility and, in some patients, multiple morphological abnormalities of the flagella including mitochondrial sheath defects [PMID:34476482, PMID:35543642, PMID:40810911].","teleology":[{"year":2002,"claim":"Established DNAH7 as an inner dynein arm heavy chain of human respiratory cilia and showed its absence from the axoneme is an assembly defect, not a synthesis defect.","evidence":"Mass spectrometry of purified cilia proteins comparing normal vs PCD bronchial epithelial cells, with cDNA cloning and immunohistochemistry","pmids":["11877439"],"confidence":"High","gaps":["Does not identify which assembly factors recruit DNAH7","No structural placement within the 96 nm repeat","Catalytic/motor activity not directly assayed"]},{"year":2014,"claim":"Demonstrated that DNAH7-dependent cilia motility drives directional fluid flow and is required for correct left-right organ laterality during development.","evidence":"Zebrafish dnah7 morpholino knockdown with live imaging of cilia and fluid flow, laterality tracking, and computational fluid dynamics simulation","pmids":["24930722"],"confidence":"High","gaps":["Morpholino knockdown not confirmed with a genetic mutant","Human laterality phenotype from DNAH7 loss not documented","Does not address sperm flagellar role"]},{"year":2021,"claim":"Linked DNAH7 loss-of-function to human asthenozoospermia through selective inner dynein arm deficiency, distinguishing it from outer dynein arm components.","evidence":"Whole-exome sequencing, TEM of sperm axonemes, and immunofluorescence in patient spermatozoa","pmids":["34476482"],"confidence":"Medium","gaps":["Single lab, no functional rescue","Mechanism of IDA-specific loss not resolved","Genotype-phenotype across larger cohorts not established"]},{"year":2022,"claim":"Extended the sperm phenotype to flagellar morphological abnormalities, showing DNAH7 loss perturbs not only IDAs but mitochondrial sheath organization in the mid-piece.","evidence":"Whole-exome sequencing, TEM, and immunofluorescence of patient spermatozoa","pmids":["35543642"],"confidence":"Medium","gaps":["Causal link between IDA loss and mitochondrial detachment unclear","Single patient","No animal model confirmation"]},{"year":2020,"claim":"Identified TBC1D21 as a factor required for correct axonemal retention of DNAH7 in sperm, the first partner shown to control DNAH7 localization.","evidence":"Co-immunofluorescence, Tbc1d21 knockout mouse, and proteomic analysis of TBC1D21 interactors","pmids":["32976492"],"confidence":"Medium","gaps":["Direct physical interaction not biochemically resolved","Whether TBC1D21 acts during assembly or maintenance unclear","Respiratory cilia not examined"]},{"year":2023,"claim":"Placed DNAH7 within a defined IDA subspecies by showing the light intermediate chain DNALI1 is required for DNAH7 (and DNAH1) but not DNAH10 retention in sperm flagella.","evidence":"Immunofluorescence of patient and Dnali1-/- mouse sperm, co-immunoprecipitation from testis lysates, and western blotting","pmids":["36792588"],"confidence":"Medium","gaps":["Direct DNALI1-DNAH7 binding interface not mapped","Stoichiometry of the subspecies unknown","Respiratory cilia subspecies composition not addressed"]},{"year":2024,"claim":"Positioned DNAH7-containing IDAs downstream of the CCDC39/CCDC40 molecular ruler in respiratory ciliary axoneme assembly.","evidence":"Next-generation sequencing of 51 PCD patients with CCDC39/CCDC40 variants and immunofluorescence of respiratory cilia","pmids":["39056782"],"confidence":"Medium","gaps":["Whether the ruler binds DNAH7 directly or sets repeat spacing is not distinguished","Sperm flagellar dependence on ruler not tested","No structural data"]},{"year":2025,"claim":"Confirmed DNAH7 is specifically required for IDA assembly in human sperm flagella, with IDA but not ODA markers lost upon DNAH7 deficiency.","evidence":"Whole-exome sequencing, TEM, and immunofluorescence with a panel of IDA (DNAH3, DNAH6) and ODA (DNAH8, DNAH11, DNAH17, DNAI1) markers in patient spermatozoa","pmids":["40810911"],"confidence":"Medium","gaps":["Hierarchy among co-lost IDA chains unresolved","No rescue experiment","Two patients only"]},{"year":2025,"claim":"Suggested spatial coupling of DNAH7-containing IDAs to radial spoke 1, as IQUB/RS1 deficiency secondarily reduces DNAH7.","evidence":"Whole-exome sequencing, mass spectrometry, western blotting, and immunofluorescence in patient and Iqub-/- mouse sperm","pmids":["39849482"],"confidence":"Low","gaps":["DNAH7 reduction is a secondary, indirect observation in an IQUB study","Direct DNAH7-RS1 contact not demonstrated","Causal direction unclear"]},{"year":null,"claim":"The motor/ATPase activity of DNAH7, its structural placement within the axonemal 96 nm repeat, and the direct molecular interactions governing its recruitment remain undefined.","evidence":"","pmids":[],"confidence":"Low","gaps":["No reconstituted motility or ATPase assay","No cryo-EM placement of DNAH7 in the IDA","Direct binding partners not biochemically mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003774","term_label":"cytoskeletal motor activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,1,6]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,3,9]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0]}],"complexes":["axonemal inner dynein arm","DNALI1-containing IDA subspecies"],"partners":["DNALI1","TBC1D21"],"other_free_text":[]}},"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":18832,"output_tokens":2964,"usd":0.050478,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10372,"output_tokens":3105,"usd":0.064742,"stage2_stop_reason":"end_turn"},"total_usd":0.11522,"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\": 2002,\n      \"finding\": \"DNAH7 was identified as a component of the inner dynein arm of human respiratory cilia. Mass spectrometry of cilia proteins from normal versus primary ciliary dyskinesia (PCD) cells identified DNAH7 as absent in PCD cilia. DNAH7 shares 68% similarity with an inner arm dynein heavy chain from Drosophila. In PCD cells lacking inner dynein arms by electron microscopy, DNAH7 protein was synthesized intracellularly but failed to assemble into cilia.\",\n      \"method\": \"Gel electrophoresis and mass spectrometry of purified cilia proteins; immunohistochemistry; cDNA cloning; comparison of normal vs. PCD bronchial epithelial cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — mass spectrometry identification of protein absence, immunohistochemistry localization, cDNA cloning, orthogonal methods in a single focused study establishing IDA localization and assembly defect\",\n      \"pmids\": [\"11877439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Zebrafish dnah7 knockdown (morphant) generated mosaic left-right organizers with reduced motile cilia numbers, demonstrating that dnah7-dependent cilia motility is required for directional fluid flow in Kupffer's vesicle and thereby for correct left-right organ laterality. Embryos with fewer motile cilia (due to dnah7 knockdown) showed reduced asymmetric charon expression and increased laterality randomization.\",\n      \"method\": \"Zebrafish dnah7 morpholino knockdown; live imaging of cilia motility and fluid flow; quantitative tracking of organ laterality; computational fluid dynamics simulation\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic knockdown with specific phenotypic readout (laterality), fluid dynamics imaging, replicated across multiple embryos with simulation validation\",\n      \"pmids\": [\"24930722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The BRAF VE1 antibody cross-reacts with epitopes in DNAH7 (and other axonemal dynein heavy chains including DNAH2 and DNAH12). There is significant sequence homology between the VE1 immunizing peptide (BRAF V600E residues 596-606) and regions of DNAH7. This was confirmed by ELISA showing VE1 antibody recognition of DNAH7 epitopes, and explains VE1 staining of cilia in bronchial airways, fallopian tubes, and other ciliated structures.\",\n      \"method\": \"ELISA; sequence homology analysis; immunohistochemistry of ciliated tissues\",\n      \"journal\": \"Modern pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ELISA directly confirms antibody-epitope binding; sequence homology provides mechanistic basis; single lab but two orthogonal methods\",\n      \"pmids\": [\"25412847\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Bi-allelic mutations in DNAH7 in asthenozoospermia patients caused specific loss of inner dynein arms (IDAs) in sperm axonemes, with significantly decreased DNAH7 expression in spermatozoa. Outer dynein arm structure was preserved. Sperm motility was severely impaired but fertilization was achievable by ICSI.\",\n      \"method\": \"Whole-exome sequencing; transmission electron microscopy of sperm axonemes; immunofluorescence/protein expression analysis in patient spermatozoa\",\n      \"journal\": \"Acta biochimica et biophysica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — TEM ultrastructural analysis and immunofluorescence in human patients with loss-of-function variants; single lab, two orthogonal methods\",\n      \"pmids\": [\"34476482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Loss-of-function mutation in DNAH7 in a human patient caused asthenozoospermia with multiple morphological abnormalities of sperm flagella. TEM revealed loss of inner dynein arms in sperm axonemes, and mitochondria of the sperm flagella detached and dispersed outside the axoneme, causing abnormalities in the mitochondrial sheath in the mid-piece region.\",\n      \"method\": \"Whole-exome sequencing; transmission electron microscopy; immunofluorescence of patient spermatozoa\",\n      \"journal\": \"Clinical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — TEM and immunofluorescence on patient material with confirmed loss-of-function variant; single lab, two orthogonal methods\",\n      \"pmids\": [\"35543642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DNALI1 deficiency in humans and mice caused loss of DNAH7 (and DNAH1) but not DNAH10 from sperm flagella, demonstrating that DNALI1 is a light intermediate chain of a partial IDA subspecies that includes DNAH7. Immunoprecipitation showed DNALI1 interacts with cytoplasmic dynein complex proteins in testes.\",\n      \"method\": \"Immunofluorescence of patient and Dnali1-/- mouse sperm; immunoprecipitation from testis lysates; western blotting\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal immunofluorescence and co-IP demonstrating DNAH7 as a component of the DNALI1-containing IDA subspecies; single lab, two orthogonal methods\",\n      \"pmids\": [\"36792588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Disease-causing bi-allelic variants in CCDC39 and CCDC40 (which encode a molecular ruler complex maintaining 96 nm axonemal repeat units) cause conspicuous absence of IDA heavy chains DNAH1, DNAH6, and DNAH7 in respiratory ciliary axonemes, as shown by immunofluorescence. This places DNAH7-containing IDAs downstream of the CCDC39/CCDC40 ruler complex in ciliary axoneme assembly.\",\n      \"method\": \"Next-generation sequencing of 51 PCD patients with CCDC39/CCDC40 variants; immunofluorescence analysis of respiratory cilia\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — immunofluorescence across a cohort of 51 patients establishing epistatic relationship; single lab but large patient cohort\",\n      \"pmids\": [\"39056782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In a PCD patient (Patient-2) with Kartagener syndrome showing absence of both dynein arms, two novel missense variants in DNAH7 were identified alongside disease-causing variants in DNAH5. Functional data showed reduced DNAH7 gene expression and protein mislocalization in Patient-2 cells, suggesting DNAH7 variants may modulate the PCD phenotype in combination with DNAH5 mutations.\",\n      \"method\": \"Whole-exome sequencing; transmission electron microscopy; RT-PCR; immunofluorescence for protein localization\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single patient case with compound genetic findings; DNAH7 contribution difficult to isolate from DNAH5 mutations; single lab\",\n      \"pmids\": [\"31443223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TBC1D21 physically co-localizes with DNAH7 (an inner arm axoneme component) in mouse sperm in vivo, and in Tbc1d21-deficient sperm, DNAH7 detaches and disperses outside the axoneme instead of aligning with it, linking TBC1D21 to the correct assembly/retention of DNAH7 in the sperm axoneme.\",\n      \"method\": \"Co-immunofluorescence localization in mouse sperm; Tbc1d21 knockout mouse model; proteomic analysis of TBC1D21 interactors\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with specific axonemal mislocalization phenotype of DNAH7, supported by co-localization and proteomics; single lab, two orthogonal methods\",\n      \"pmids\": [\"32976492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Biallelic loss-of-function variants in DNAH7 in two infertile men caused asthenozoospermia with severe IDA loss in sperm flagella. Immunofluorescence showed markedly reduced DNAH7 and other IDA-associated proteins (DNAH3, DNAH6) in patient spermatozoa, while ODA-associated proteins (DNAH8, DNAH11, DNAH17, DNAI1) were unaffected, confirming DNAH7 is specifically required for IDA assembly in human sperm flagella.\",\n      \"method\": \"Whole-exome sequencing; transmission electron microscopy; immunofluorescence of patient spermatozoa\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — TEM ultrastructural analysis and immunofluorescence with panel of IDA and ODA markers in confirmed loss-of-function patients; single lab, two orthogonal methods\",\n      \"pmids\": [\"40810911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"IQUB deficiency caused significant downregulation of DNAH7 (and DNAH12) in sperm flagella alongside radial spoke 1 (RS1) deficiency, establishing that DNAH7-containing IDAs are in close proximity to RS1 and their assembly or stability is dependent on intact RS1 structure.\",\n      \"method\": \"Whole-exome sequencing; protein mass spectrometry; western blotting; immunofluorescence in patient and Iqub-/- mouse sperm\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — DNAH7 downregulation is a secondary finding in an IQUB study; single lab, indirect evidence of spatial/functional relationship\",\n      \"pmids\": [\"39849482\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DNAH7 is an inner dynein arm (IDA) heavy chain component of axonemal structures in both respiratory cilia and sperm flagella; it is synthesized in the cytoplasm but requires intact assembly machinery (including the CCDC39/CCDC40 molecular ruler complex and the IDA light intermediate chain DNALI1) for incorporation into the axoneme, and loss-of-function mutations cause selective IDA deficiency in sperm leading to asthenozoospermia, while in cilia its motility is required for directional fluid flow and correct left-right organ laterality.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DNAH7 is an inner dynein arm (IDA) heavy chain that powers the motility of both respiratory cilia and sperm flagella, where its activity drives directional fluid flow required for normal left-right organ laterality [#0, #1]. It was first identified as an IDA component of human respiratory cilia that is absent from primary ciliary dyskinesia cells lacking inner dynein arms; in these cells DNAH7 protein is synthesized in the cytoplasm but fails to assemble into the axoneme, establishing that its function depends on intact axonemal assembly machinery rather than on its own expression alone [#0]. This assembly dependence is borne out by several upstream factors: the CCDC39/CCDC40 molecular ruler complex is required for incorporation of DNAH7-containing IDAs into respiratory axonemes [#6], and in sperm flagella DNAH7 is a component of the IDA subspecies defined by the light intermediate chain DNALI1, whose loss strips DNAH7 from the flagellum [#5]. Correct axonemal retention of DNAH7 in sperm additionally requires TBC1D21, in whose absence DNAH7 detaches and disperses outside the axoneme [#8]. Bi-allelic loss-of-function mutations in DNAH7 cause asthenozoospermia with selective loss of inner dynein arms while outer dynein arm components are preserved, producing severely impaired sperm motility and, in some patients, multiple morphological abnormalities of the flagella including mitochondrial sheath defects [#3, #4, #9].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established DNAH7 as an inner dynein arm heavy chain of human respiratory cilia and showed its absence from the axoneme is an assembly defect, not a synthesis defect.\",\n      \"evidence\": \"Mass spectrometry of purified cilia proteins comparing normal vs PCD bronchial epithelial cells, with cDNA cloning and immunohistochemistry\",\n      \"pmids\": [\"11877439\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not identify which assembly factors recruit DNAH7\", \"No structural placement within the 96 nm repeat\", \"Catalytic/motor activity not directly assayed\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated that DNAH7-dependent cilia motility drives directional fluid flow and is required for correct left-right organ laterality during development.\",\n      \"evidence\": \"Zebrafish dnah7 morpholino knockdown with live imaging of cilia and fluid flow, laterality tracking, and computational fluid dynamics simulation\",\n      \"pmids\": [\"24930722\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Morpholino knockdown not confirmed with a genetic mutant\", \"Human laterality phenotype from DNAH7 loss not documented\", \"Does not address sperm flagellar role\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Linked DNAH7 loss-of-function to human asthenozoospermia through selective inner dynein arm deficiency, distinguishing it from outer dynein arm components.\",\n      \"evidence\": \"Whole-exome sequencing, TEM of sperm axonemes, and immunofluorescence in patient spermatozoa\",\n      \"pmids\": [\"34476482\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, no functional rescue\", \"Mechanism of IDA-specific loss not resolved\", \"Genotype-phenotype across larger cohorts not established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended the sperm phenotype to flagellar morphological abnormalities, showing DNAH7 loss perturbs not only IDAs but mitochondrial sheath organization in the mid-piece.\",\n      \"evidence\": \"Whole-exome sequencing, TEM, and immunofluorescence of patient spermatozoa\",\n      \"pmids\": [\"35543642\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal link between IDA loss and mitochondrial detachment unclear\", \"Single patient\", \"No animal model confirmation\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified TBC1D21 as a factor required for correct axonemal retention of DNAH7 in sperm, the first partner shown to control DNAH7 localization.\",\n      \"evidence\": \"Co-immunofluorescence, Tbc1d21 knockout mouse, and proteomic analysis of TBC1D21 interactors\",\n      \"pmids\": [\"32976492\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct physical interaction not biochemically resolved\", \"Whether TBC1D21 acts during assembly or maintenance unclear\", \"Respiratory cilia not examined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Placed DNAH7 within a defined IDA subspecies by showing the light intermediate chain DNALI1 is required for DNAH7 (and DNAH1) but not DNAH10 retention in sperm flagella.\",\n      \"evidence\": \"Immunofluorescence of patient and Dnali1-/- mouse sperm, co-immunoprecipitation from testis lysates, and western blotting\",\n      \"pmids\": [\"36792588\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct DNALI1-DNAH7 binding interface not mapped\", \"Stoichiometry of the subspecies unknown\", \"Respiratory cilia subspecies composition not addressed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Positioned DNAH7-containing IDAs downstream of the CCDC39/CCDC40 molecular ruler in respiratory ciliary axoneme assembly.\",\n      \"evidence\": \"Next-generation sequencing of 51 PCD patients with CCDC39/CCDC40 variants and immunofluorescence of respiratory cilia\",\n      \"pmids\": [\"39056782\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the ruler binds DNAH7 directly or sets repeat spacing is not distinguished\", \"Sperm flagellar dependence on ruler not tested\", \"No structural data\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Confirmed DNAH7 is specifically required for IDA assembly in human sperm flagella, with IDA but not ODA markers lost upon DNAH7 deficiency.\",\n      \"evidence\": \"Whole-exome sequencing, TEM, and immunofluorescence with a panel of IDA (DNAH3, DNAH6) and ODA (DNAH8, DNAH11, DNAH17, DNAI1) markers in patient spermatozoa\",\n      \"pmids\": [\"40810911\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Hierarchy among co-lost IDA chains unresolved\", \"No rescue experiment\", \"Two patients only\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Suggested spatial coupling of DNAH7-containing IDAs to radial spoke 1, as IQUB/RS1 deficiency secondarily reduces DNAH7.\",\n      \"evidence\": \"Whole-exome sequencing, mass spectrometry, western blotting, and immunofluorescence in patient and Iqub-/- mouse sperm\",\n      \"pmids\": [\"39849482\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"DNAH7 reduction is a secondary, indirect observation in an IQUB study\", \"Direct DNAH7-RS1 contact not demonstrated\", \"Causal direction unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The motor/ATPase activity of DNAH7, its structural placement within the axonemal 96 nm repeat, and the direct molecular interactions governing its recruitment remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No reconstituted motility or ATPase assay\", \"No cryo-EM placement of DNAH7 in the IDA\", \"Direct binding partners not biochemically mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003774\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 1, 6]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 3, 9]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [\"axonemal inner dynein arm\", \"DNALI1-containing IDA subspecies\"],\n    \"partners\": [\"DNALI1\", \"TBC1D21\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}