{"gene":"DNAH5","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2002,"finding":"DNAH5 encodes a protein highly similar to the Chlamydomonas gamma-dynein heavy chain; mutations causing non-functional DNAH5 protein result in primary ciliary dyskinesia (PCD) with outer dynein arm defects and randomization of left-right body asymmetry, establishing DNAH5 as an essential outer dynein arm component for ciliary motility.","method":"Full-length transcript characterization, mutation sequencing in PCD patients with randomization of left-right asymmetry","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — mutation identification with functional consequence (loss-of-function), replicated across multiple patients and subsequently confirmed by multiple independent labs","pmids":["11788826"],"is_preprint":false},{"year":2005,"finding":"In normal ciliated airway epithelium, DNAH5 and DNAH9 show a specific regional distribution along the ciliary axoneme, indicating the existence of at least two distinct outer dynein arm (ODA) types. In PCD patients with DNAH5 or DNAI1 mutations, DNAH5 is completely or only distally absent from the ciliary axoneme and instead accumulates at the microtubule-organizing centers. Cilia with complete axonemal DNAH5 deficiency are immotile, whereas cilia with distal DNAH5 deficiency show residual motility.","method":"High-resolution immunofluorescence imaging of respiratory epithelial and sperm cells; high-speed video microscopy","journal":"American journal of respiratory and critical care medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization experiment with functional consequence (motility), blinded investigation in large cohort, orthogonal methods (immunofluorescence + video microscopy)","pmids":["15750039"],"is_preprint":false},{"year":2006,"finding":"DNAH5 mutations invariably cause outer dynein arm ciliary defects detectable by electron microscopy; mutant DNAH5 is mislocalized and absent from the ciliary axoneme (completely in most patients, remaining detectable only in the proximal axoneme in one patient with compound heterozygous splicing mutations at the 3'-end). Mutations cluster in five exons. DNAH5 mutations account for 53% of PCD patients with outer dynein arm defects.","method":"Haplotype analyses, sequencing of 109 PCD families; electron microscopy; high-resolution immunofluorescence imaging","journal":"American journal of respiratory and critical care medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — large multi-centre cohort, orthogonal methods (genetics + EM + immunofluorescence), replicates prior localization findings","pmids":["16627867"],"is_preprint":false},{"year":2006,"finding":"DNAH5 axonemal localization is not altered by secondary ciliary dyskinesia (SCD) induced by IL-13 treatment or inflammatory conditions in vivo, demonstrating that DNAH5 mislocalization is specific to primary ciliary dyskinesia with ODA defects and not a consequence of inflammation-induced secondary changes.","method":"IL-13 treatment of primary human respiratory epithelial cell cultures to induce SCD; high-speed videomicroscopy; transmission electron microscopy; immunofluorescence microscopy","journal":"Pediatric research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiment with functional controls (SCD induced in vitro and confirmed in vivo), single lab, two orthogonal methods","pmids":["16492982"],"is_preprint":false},{"year":2019,"finding":"In Dnah5 mutant mice, embryonic left-right organizer (LRO) monocilia lack outer dynein arms, resulting in immotile cilia, impaired leftward fluid flow at the LRO, and randomization of Nodal signaling cascade (normal, reversed, or bilateral expression of key laterality molecules), directly demonstrating the disease mechanism of laterality defects linked to DNAH5 deficiency at the molecular level during embryogenesis.","method":"High-speed video microscopy, immunofluorescence, and in situ hybridization analyses in Dnah5 mutant mouse embryos; genotype/phenotype correlations in 132 PCD patients","journal":"Circulation. Genomic and precision medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct functional demonstration in Dnah5 mutant mouse model with multiple orthogonal methods (video microscopy + immunofluorescence + in situ hybridization), corroborated by human genotype-phenotype data","pmids":["31638833"],"is_preprint":false},{"year":2016,"finding":"The TRA2B-DNAH5 fusion gene, identified exclusively in lung squamous cell carcinoma (3.1% of cases), acts as an oncogenic driver that promotes malignant progression through a SIRT6-ERK1/2-MMP1 signaling axis; inhibition of ERK1/2 activation using selumetinib efficiently inhibits growth of lung SCC with TRA2B-DNAH5 fusion expression.","method":"Exon array analyses, molecular analyses, functional studies including ERK1/2 inhibitor treatment in cell lines expressing TRA2B-DNAH5 fusion","journal":"Cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional studies with pathway inhibition demonstrating mechanism, single lab, multiple orthogonal methods (exon array + molecular + functional assays)","pmids":["27670699"],"is_preprint":false},{"year":2022,"finding":"In a PCD airway organoid model with DNAH5 mutation, multiomics analysis (scRNA-seq and proteomics) revealed abnormal ciliary function and decreased immune response; the TGF-β/BMP and Notch pathways regulate epithelial differentiation of ciliated cells, and directed induction of ciliated cells by these pathways increased expression of inflammatory cytokines, linking DNAH5-deficient cilia to dysregulated immune signaling.","method":"Airway organoid model from bronchoscopic biopsy of DNAH5-mutated PCD patient; single-cell RNA sequencing; proteomic analysis","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — organoid model with multiomics (scRNA-seq + proteomics), single lab, novel mechanistic pathway identification","pmids":["36552777"],"is_preprint":false},{"year":2000,"finding":"DNAH5, encoding a Chlamydomonas-related axonemal heavy dynein chain, was localized to chromosome 5p15-p14 by homozygosity mapping in a consanguineous PCD family exhibiting ciliary akinesia and absence of outer dynein arms, establishing it as a candidate gene for PCD at this locus.","method":"Total genome scan with 340 polymorphic microsatellites; homozygosity mapping; PCR-based cDNA identification","journal":"American journal of respiratory cell and molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic mapping with functional context (electron microscopy showing ODA absence), single family but rigorous mapping approach","pmids":["11062149"],"is_preprint":false},{"year":2017,"finding":"Absence or mislocalization of DNAH5 (patterns of complete absence or distal axonemal absence) is significantly more prevalent in nasal polyps compared to healthy controls, and DNAH5 mislocalization score positively correlates with Lund-Mackay CT score and eosinophilic nasal polyp status, indicating DNAH5 localization as a marker of motile ciliary abnormality in chronically inflamed airway epithelium.","method":"Immunofluorescence staining of DNAH5 in paraffin-embedded nasal biopsies and cytospin samples; semiquantitative scoring system","journal":"The Laryngoscope","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — immunofluorescence localization in large cohort (n=155 biopsies), single lab, no functional readout beyond localization pattern","pmids":["29148098"],"is_preprint":false}],"current_model":"DNAH5 encodes an axonemal outer dynein arm (ODA) heavy chain that is essential for ciliary motility: it localizes specifically along the ciliary axoneme (with DNAH5 occupying the proximal/full axoneme and DNAH9 the distal portion, defining at least two ODA subtypes), and loss-of-function mutations cause mislocalization of DNAH5 to microtubule-organizing centers with consequent ODA absence, immotile cilia, impaired leftward fluid flow at the embryonic left-right organizer, randomization of Nodal signaling, and the clinical syndrome of primary ciliary dyskinesia with laterality defects; additionally, a TRA2B-DNAH5 gene fusion found in lung squamous cell carcinoma acts as an oncogenic driver through a SIRT6-ERK1/2-MMP1 signaling axis."},"narrative":{"mechanistic_narrative":"DNAH5 encodes an axonemal outer dynein arm (ODA) heavy chain that powers ciliary motility, and its loss causes primary ciliary dyskinesia (PCD) with randomization of left-right body asymmetry [PMID:11788826, PMID:11062149]. The protein localizes in a defined regional pattern along the ciliary axoneme, where DNAH5 and DNAH9 occupy distinct domains and define at least two ODA subtypes [PMID:15750039]. Loss-of-function mutations cluster in a small set of exons and account for a major share of ODA-defective PCD; in mutant cells DNAH5 fails to assemble into the axoneme and instead accumulates at the microtubule-organizing center, with complete absence yielding immotile cilia and distal-only absence permitting residual motility [PMID:15750039, PMID:16627867]. This mislocalization is specific to the primary defect and is not induced by inflammatory or IL-13-driven secondary ciliary dyskinesia [PMID:16492982]. The disease mechanism for laterality defects was established in Dnah5 mutant mice, in which left-right organizer monocilia lack ODAs, fail to generate leftward fluid flow, and randomize the Nodal signaling cascade during embryogenesis [PMID:31638833]. Separately, a recurrent TRA2B-DNAH5 gene fusion identified in lung squamous cell carcinoma acts as an oncogenic driver via a SIRT6-ERK1/2-MMP1 signaling axis [PMID:27670699].","teleology":[{"year":2000,"claim":"Establishing a genomic locus for a Chlamydomonas-related dynein heavy chain was the first step in linking DNAH5 to ciliary motility disease, before any causal mutation was known.","evidence":"Genome-wide homozygosity mapping in a consanguineous PCD family with ODA absence on electron microscopy","pmids":["11062149"],"confidence":"Medium","gaps":["Single family, candidate-gene status only","No causative mutation demonstrated","No direct protein localization shown"]},{"year":2002,"claim":"Identifying loss-of-function mutations in PCD patients with laterality randomization established DNAH5 as an essential ODA heavy chain required for ciliary motility and left-right asymmetry.","evidence":"Full-length transcript characterization and mutation sequencing in PCD patients","pmids":["11788826"],"confidence":"High","gaps":["Did not resolve subcellular localization of mutant protein","Did not address embryonic mechanism of laterality"]},{"year":2005,"claim":"Resolving where DNAH5 sits in the axoneme revealed regional ODA heterogeneity and showed that mutant protein mislocalizes to the MTOC, linking assembly failure to graded motility loss.","evidence":"High-resolution immunofluorescence of respiratory and sperm cells plus high-speed video microscopy","pmids":["15750039"],"confidence":"High","gaps":["Mechanism of regional ODA targeting (proximal vs distal) not defined","Molecular basis of MTOC accumulation not established"]},{"year":2006,"claim":"Large cohort genetics combined with EM and immunofluorescence quantified the mutational and ultrastructural footprint of DNAH5 deficiency, defining it as the predominant cause of ODA-defective PCD.","evidence":"Haplotype analysis and sequencing of 109 PCD families with electron microscopy and immunofluorescence","pmids":["16627867"],"confidence":"High","gaps":["Functional consequences of mutation clustering in five exons not mechanistically explained","Proximal-only retention in one patient not generalized"]},{"year":2006,"claim":"Showing that inflammation-induced secondary ciliary dyskinesia does not alter DNAH5 localization confirmed that mislocalization is a specific readout of the primary defect, validating it as a diagnostic marker.","evidence":"IL-13 induction of SCD in primary human airway cultures with videomicroscopy, EM, and immunofluorescence","pmids":["16492982"],"confidence":"Medium","gaps":["Single lab","Did not test all inflammatory contexts"]},{"year":2016,"claim":"Discovery of a TRA2B-DNAH5 fusion in lung squamous cell carcinoma revealed an oncogenic role distinct from ciliary motility, acting through a defined kinase signaling axis.","evidence":"Exon array, molecular analysis, and ERK1/2 inhibitor (selumetinib) treatment of fusion-expressing cell lines","pmids":["27670699"],"confidence":"Medium","gaps":["Single lab","Contribution of native DNAH5 sequence to fusion function unclear","In vivo tumor dependence not fully established"]},{"year":2019,"claim":"A Dnah5 mutant mouse pinned the laterality defect to immotile left-right organizer cilia, absent ODAs, lost leftward flow, and randomized Nodal signaling, closing the mechanistic loop from gene to embryonic asymmetry.","evidence":"High-speed video microscopy, immunofluorescence, and in situ hybridization in mutant mouse embryos with human genotype-phenotype correlation","pmids":["31638833"],"confidence":"High","gaps":["Did not resolve why laterality outcome varies (normal/reversed/bilateral)","Upstream determinants of flow sensing not addressed"]},{"year":2022,"claim":"An airway organoid multiomics study connected DNAH5-deficient cilia to dysregulated immune signaling via TGF-beta/BMP and Notch control of ciliated cell differentiation.","evidence":"DNAH5-mutant PCD patient airway organoid with scRNA-seq and proteomics","pmids":["36552777"],"confidence":"Medium","gaps":["Single patient-derived model","Causal direction between ciliary defect and immune dysregulation not proven","Pathway link correlative"]},{"year":null,"claim":"The molecular determinants that target DNAH5 to proximal versus distal axonemal ODA subtypes, and the basis for variable laterality outcomes, remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model of DNAH5 within the ODA","Mechanism of regional ODA assembly unknown","Assembly factors directing axonemal vs MTOC localization not identified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003774","term_label":"cytoskeletal motor activity","supporting_discovery_ids":[0,4]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[1,2,4]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[1,2]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[4]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5]}],"complexes":["axonemal outer dynein arm"],"partners":["DNAH9"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8TE73","full_name":"Dynein axonemal heavy chain 5","aliases":["Axonemal beta dynein heavy chain 5","Ciliary dynein heavy chain 5"],"length_aa":4624,"mass_kda":529.0,"function":"Force generating protein of respiratory cilia (By similarity). Produces force towards the minus ends of microtubules (By similarity). Key component of dynein, a family of motor proteins essential for movement along microtubules (By similarity). Dynein has ATPase activity; the force-producing power stroke is thought to occur on release of ADP (By similarity). Required for structural and functional integrity of the cilia of ependymal cells lining the brain ventricles (By similarity)","subcellular_location":"Cytoplasm, cytoskeleton, cilium axoneme","url":"https://www.uniprot.org/uniprotkb/Q8TE73/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DNAH5","classification":"Not Classified","n_dependent_lines":17,"n_total_lines":1208,"dependency_fraction":0.014072847682119206},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DNAH5","total_profiled":1310},"omim":[{"mim_id":"620642","title":"CILIARY DYSKINESIA, PRIMARY, 53; CILD53","url":"https://www.omim.org/entry/620642"},{"mim_id":"619564","title":"CALAXIN; CLXN","url":"https://www.omim.org/entry/619564"},{"mim_id":"618699","title":"CILIARY DYSKINESIA, PRIMARY, 43; CILD43","url":"https://www.omim.org/entry/618699"},{"mim_id":"618695","title":"CILIARY DYSKINESIA, PRIMARY, 42; CILD42","url":"https://www.omim.org/entry/618695"},{"mim_id":"618300","title":"CILIARY DYSKINESIA, PRIMARY, 40; CILD40","url":"https://www.omim.org/entry/618300"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"choroid plexus","ntpm":2.8},{"tissue":"fallopian tube","ntpm":3.3}],"url":"https://www.proteinatlas.org/search/DNAH5"},"hgnc":{"alias_symbol":["Dnahc5","HL1","PCD","CILD3","KTGNR"],"prev_symbol":[]},"alphafold":{"accession":"Q8TE73","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TE73","model_url":"","pae_url":"","plddt_mean":null},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DNAH5","jax_strain_url":"https://www.jax.org/strain/search?query=DNAH5"},"sequence":{"accession":"Q8TE73","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8TE73.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8TE73/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TE73"}},"corpus_meta":[{"pmid":"9501201","id":"PMC_9501201","title":"HL-1 cells: a cardiac muscle cell line that contracts and retains phenotypic characteristics of the adult cardiomyocyte.","date":"1998","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/9501201","citation_count":1311,"is_preprint":false},{"pmid":"11788826","id":"PMC_11788826","title":"Mutations in DNAH5 cause primary ciliary dyskinesia and randomization of left-right asymmetry.","date":"2002","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/11788826","citation_count":407,"is_preprint":false},{"pmid":"14766671","id":"PMC_14766671","title":"Cardiac physiology at the cellular level: use of cultured HL-1 cardiomyocytes for studies of cardiac muscle cell structure and function.","date":"2004","source":"American journal of physiology. 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highly similar to the Chlamydomonas gamma-dynein heavy chain; mutations causing non-functional DNAH5 protein result in primary ciliary dyskinesia (PCD) with outer dynein arm defects and randomization of left-right body asymmetry, establishing DNAH5 as an essential outer dynein arm component for ciliary motility.\",\n      \"method\": \"Full-length transcript characterization, mutation sequencing in PCD patients with randomization of left-right asymmetry\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mutation identification with functional consequence (loss-of-function), replicated across multiple patients and subsequently confirmed by multiple independent labs\",\n      \"pmids\": [\"11788826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"In normal ciliated airway epithelium, DNAH5 and DNAH9 show a specific regional distribution along the ciliary axoneme, indicating the existence of at least two distinct outer dynein arm (ODA) types. In PCD patients with DNAH5 or DNAI1 mutations, DNAH5 is completely or only distally absent from the ciliary axoneme and instead accumulates at the microtubule-organizing centers. Cilia with complete axonemal DNAH5 deficiency are immotile, whereas cilia with distal DNAH5 deficiency show residual motility.\",\n      \"method\": \"High-resolution immunofluorescence imaging of respiratory epithelial and sperm cells; high-speed video microscopy\",\n      \"journal\": \"American journal of respiratory and critical care medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization experiment with functional consequence (motility), blinded investigation in large cohort, orthogonal methods (immunofluorescence + video microscopy)\",\n      \"pmids\": [\"15750039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"DNAH5 mutations invariably cause outer dynein arm ciliary defects detectable by electron microscopy; mutant DNAH5 is mislocalized and absent from the ciliary axoneme (completely in most patients, remaining detectable only in the proximal axoneme in one patient with compound heterozygous splicing mutations at the 3'-end). Mutations cluster in five exons. DNAH5 mutations account for 53% of PCD patients with outer dynein arm defects.\",\n      \"method\": \"Haplotype analyses, sequencing of 109 PCD families; electron microscopy; high-resolution immunofluorescence imaging\",\n      \"journal\": \"American journal of respiratory and critical care medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — large multi-centre cohort, orthogonal methods (genetics + EM + immunofluorescence), replicates prior localization findings\",\n      \"pmids\": [\"16627867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"DNAH5 axonemal localization is not altered by secondary ciliary dyskinesia (SCD) induced by IL-13 treatment or inflammatory conditions in vivo, demonstrating that DNAH5 mislocalization is specific to primary ciliary dyskinesia with ODA defects and not a consequence of inflammation-induced secondary changes.\",\n      \"method\": \"IL-13 treatment of primary human respiratory epithelial cell cultures to induce SCD; high-speed videomicroscopy; transmission electron microscopy; immunofluorescence microscopy\",\n      \"journal\": \"Pediatric research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiment with functional controls (SCD induced in vitro and confirmed in vivo), single lab, two orthogonal methods\",\n      \"pmids\": [\"16492982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In Dnah5 mutant mice, embryonic left-right organizer (LRO) monocilia lack outer dynein arms, resulting in immotile cilia, impaired leftward fluid flow at the LRO, and randomization of Nodal signaling cascade (normal, reversed, or bilateral expression of key laterality molecules), directly demonstrating the disease mechanism of laterality defects linked to DNAH5 deficiency at the molecular level during embryogenesis.\",\n      \"method\": \"High-speed video microscopy, immunofluorescence, and in situ hybridization analyses in Dnah5 mutant mouse embryos; genotype/phenotype correlations in 132 PCD patients\",\n      \"journal\": \"Circulation. Genomic and precision medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct functional demonstration in Dnah5 mutant mouse model with multiple orthogonal methods (video microscopy + immunofluorescence + in situ hybridization), corroborated by human genotype-phenotype data\",\n      \"pmids\": [\"31638833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The TRA2B-DNAH5 fusion gene, identified exclusively in lung squamous cell carcinoma (3.1% of cases), acts as an oncogenic driver that promotes malignant progression through a SIRT6-ERK1/2-MMP1 signaling axis; inhibition of ERK1/2 activation using selumetinib efficiently inhibits growth of lung SCC with TRA2B-DNAH5 fusion expression.\",\n      \"method\": \"Exon array analyses, molecular analyses, functional studies including ERK1/2 inhibitor treatment in cell lines expressing TRA2B-DNAH5 fusion\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional studies with pathway inhibition demonstrating mechanism, single lab, multiple orthogonal methods (exon array + molecular + functional assays)\",\n      \"pmids\": [\"27670699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In a PCD airway organoid model with DNAH5 mutation, multiomics analysis (scRNA-seq and proteomics) revealed abnormal ciliary function and decreased immune response; the TGF-β/BMP and Notch pathways regulate epithelial differentiation of ciliated cells, and directed induction of ciliated cells by these pathways increased expression of inflammatory cytokines, linking DNAH5-deficient cilia to dysregulated immune signaling.\",\n      \"method\": \"Airway organoid model from bronchoscopic biopsy of DNAH5-mutated PCD patient; single-cell RNA sequencing; proteomic analysis\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — organoid model with multiomics (scRNA-seq + proteomics), single lab, novel mechanistic pathway identification\",\n      \"pmids\": [\"36552777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"DNAH5, encoding a Chlamydomonas-related axonemal heavy dynein chain, was localized to chromosome 5p15-p14 by homozygosity mapping in a consanguineous PCD family exhibiting ciliary akinesia and absence of outer dynein arms, establishing it as a candidate gene for PCD at this locus.\",\n      \"method\": \"Total genome scan with 340 polymorphic microsatellites; homozygosity mapping; PCR-based cDNA identification\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic mapping with functional context (electron microscopy showing ODA absence), single family but rigorous mapping approach\",\n      \"pmids\": [\"11062149\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Absence or mislocalization of DNAH5 (patterns of complete absence or distal axonemal absence) is significantly more prevalent in nasal polyps compared to healthy controls, and DNAH5 mislocalization score positively correlates with Lund-Mackay CT score and eosinophilic nasal polyp status, indicating DNAH5 localization as a marker of motile ciliary abnormality in chronically inflamed airway epithelium.\",\n      \"method\": \"Immunofluorescence staining of DNAH5 in paraffin-embedded nasal biopsies and cytospin samples; semiquantitative scoring system\",\n      \"journal\": \"The Laryngoscope\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — immunofluorescence localization in large cohort (n=155 biopsies), single lab, no functional readout beyond localization pattern\",\n      \"pmids\": [\"29148098\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DNAH5 encodes an axonemal outer dynein arm (ODA) heavy chain that is essential for ciliary motility: it localizes specifically along the ciliary axoneme (with DNAH5 occupying the proximal/full axoneme and DNAH9 the distal portion, defining at least two ODA subtypes), and loss-of-function mutations cause mislocalization of DNAH5 to microtubule-organizing centers with consequent ODA absence, immotile cilia, impaired leftward fluid flow at the embryonic left-right organizer, randomization of Nodal signaling, and the clinical syndrome of primary ciliary dyskinesia with laterality defects; additionally, a TRA2B-DNAH5 gene fusion found in lung squamous cell carcinoma acts as an oncogenic driver through a SIRT6-ERK1/2-MMP1 signaling axis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DNAH5 encodes an axonemal outer dynein arm (ODA) heavy chain that powers ciliary motility, and its loss causes primary ciliary dyskinesia (PCD) with randomization of left-right body asymmetry [#0, #7]. The protein localizes in a defined regional pattern along the ciliary axoneme, where DNAH5 and DNAH9 occupy distinct domains and define at least two ODA subtypes [#1]. Loss-of-function mutations cluster in a small set of exons and account for a major share of ODA-defective PCD; in mutant cells DNAH5 fails to assemble into the axoneme and instead accumulates at the microtubule-organizing center, with complete absence yielding immotile cilia and distal-only absence permitting residual motility [#1, #2]. This mislocalization is specific to the primary defect and is not induced by inflammatory or IL-13-driven secondary ciliary dyskinesia [#3]. The disease mechanism for laterality defects was established in Dnah5 mutant mice, in which left-right organizer monocilia lack ODAs, fail to generate leftward fluid flow, and randomize the Nodal signaling cascade during embryogenesis [#4]. Separately, a recurrent TRA2B-DNAH5 gene fusion identified in lung squamous cell carcinoma acts as an oncogenic driver via a SIRT6-ERK1/2-MMP1 signaling axis [#5].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Establishing a genomic locus for a Chlamydomonas-related dynein heavy chain was the first step in linking DNAH5 to ciliary motility disease, before any causal mutation was known.\",\n      \"evidence\": \"Genome-wide homozygosity mapping in a consanguineous PCD family with ODA absence on electron microscopy\",\n      \"pmids\": [\"11062149\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single family, candidate-gene status only\", \"No causative mutation demonstrated\", \"No direct protein localization shown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identifying loss-of-function mutations in PCD patients with laterality randomization established DNAH5 as an essential ODA heavy chain required for ciliary motility and left-right asymmetry.\",\n      \"evidence\": \"Full-length transcript characterization and mutation sequencing in PCD patients\",\n      \"pmids\": [\"11788826\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve subcellular localization of mutant protein\", \"Did not address embryonic mechanism of laterality\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Resolving where DNAH5 sits in the axoneme revealed regional ODA heterogeneity and showed that mutant protein mislocalizes to the MTOC, linking assembly failure to graded motility loss.\",\n      \"evidence\": \"High-resolution immunofluorescence of respiratory and sperm cells plus high-speed video microscopy\",\n      \"pmids\": [\"15750039\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of regional ODA targeting (proximal vs distal) not defined\", \"Molecular basis of MTOC accumulation not established\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Large cohort genetics combined with EM and immunofluorescence quantified the mutational and ultrastructural footprint of DNAH5 deficiency, defining it as the predominant cause of ODA-defective PCD.\",\n      \"evidence\": \"Haplotype analysis and sequencing of 109 PCD families with electron microscopy and immunofluorescence\",\n      \"pmids\": [\"16627867\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequences of mutation clustering in five exons not mechanistically explained\", \"Proximal-only retention in one patient not generalized\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showing that inflammation-induced secondary ciliary dyskinesia does not alter DNAH5 localization confirmed that mislocalization is a specific readout of the primary defect, validating it as a diagnostic marker.\",\n      \"evidence\": \"IL-13 induction of SCD in primary human airway cultures with videomicroscopy, EM, and immunofluorescence\",\n      \"pmids\": [\"16492982\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Did not test all inflammatory contexts\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Discovery of a TRA2B-DNAH5 fusion in lung squamous cell carcinoma revealed an oncogenic role distinct from ciliary motility, acting through a defined kinase signaling axis.\",\n      \"evidence\": \"Exon array, molecular analysis, and ERK1/2 inhibitor (selumetinib) treatment of fusion-expressing cell lines\",\n      \"pmids\": [\"27670699\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Contribution of native DNAH5 sequence to fusion function unclear\", \"In vivo tumor dependence not fully established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"A Dnah5 mutant mouse pinned the laterality defect to immotile left-right organizer cilia, absent ODAs, lost leftward flow, and randomized Nodal signaling, closing the mechanistic loop from gene to embryonic asymmetry.\",\n      \"evidence\": \"High-speed video microscopy, immunofluorescence, and in situ hybridization in mutant mouse embryos with human genotype-phenotype correlation\",\n      \"pmids\": [\"31638833\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve why laterality outcome varies (normal/reversed/bilateral)\", \"Upstream determinants of flow sensing not addressed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"An airway organoid multiomics study connected DNAH5-deficient cilia to dysregulated immune signaling via TGF-beta/BMP and Notch control of ciliated cell differentiation.\",\n      \"evidence\": \"DNAH5-mutant PCD patient airway organoid with scRNA-seq and proteomics\",\n      \"pmids\": [\"36552777\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single patient-derived model\", \"Causal direction between ciliary defect and immune dysregulation not proven\", \"Pathway link correlative\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular determinants that target DNAH5 to proximal versus distal axonemal ODA subtypes, and the basis for variable laterality outcomes, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of DNAH5 within the ODA\", \"Mechanism of regional ODA assembly unknown\", \"Assembly factors directing axonemal vs MTOC localization not identified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003774\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [1, 2, 4]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"complexes\": [\"axonemal outer dynein arm\"],\n    \"partners\": [\"DNAH9\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}