{"gene":"DNAH5","run_date":"2026-04-28T17:46:02","timeline":{"discoveries":[{"year":2002,"finding":"DNAH5 encodes a protein highly similar to the Chlamydomonas gamma-dynein heavy chain; loss-of-function mutations in DNAH5 cause primary ciliary dyskinesia with randomization of left-right asymmetry, identifying DNAH5 as a component of the outer dynein arm required for cilia motility and left-right axis establishment.","method":"Full-length transcript characterization, mutation identification by sequence analysis in PCD patients with situs inversus","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 — original disease-gene discovery with transcript characterization and mutation analysis, replicated extensively across subsequent studies","pmids":["11788826"],"is_preprint":false},{"year":2005,"finding":"DNAH5 shows a specific regional distribution along the ciliary axoneme in normal respiratory epithelium (proximal region), distinct from DNAH9 (distal region), indicating the existence of at least two distinct outer dynein arm (ODA) types. In PCD patients with DNAH5 or DNAI1 mutations, DNAH5 is absent from the ciliary axoneme and accumulates at the microtubule-organizing centers. Cilia with complete axonemal DNAH5 deficiency are immotile, whereas cilia with only distal DNAH5 deficiency retain residual motility.","method":"High-resolution immunofluorescence imaging with specific antibodies, high-speed video microscopy, fractionation/localization in respiratory epithelial and sperm cells from PCD patients and controls","journal":"American journal of respiratory and critical care medicine","confidence":"High","confidence_rationale":"Tier 2 — direct localization experiments with functional consequence (motility) linked to axonemal position, blinded cohort validation","pmids":["15750039"],"is_preprint":false},{"year":2006,"finding":"In PCD patients with DNAH5 mutations, DNAH5 is mislocalized and absent throughout the ciliary axoneme (or only distally absent), with accumulation at the microtubule organizing centers; mutations cluster in five exons. DNAH5 mutations invariably produce outer dynein arm defects by electron microscopy, confirming DNAH5 as an outer dynein arm component essential for axonemal assembly.","method":"Haplotype analysis, sequencing, electron microscopy of cilia, high-resolution immunofluorescence imaging of respiratory epithelial cells from 22 patients","journal":"American journal of respiratory and critical care medicine","confidence":"High","confidence_rationale":"Tier 2 — large multi-center cohort with corroborating EM and immunofluorescence data, functionally linked mislocalization phenotype","pmids":["16627867"],"is_preprint":false},{"year":2006,"finding":"Axonemal localization of DNAH5 is not altered in secondary ciliary dyskinesia (SCD) induced by IL-13 treatment or in vivo inflammation, distinguishing DNAH5 mislocalization as a specific diagnostic marker for PCD with ODA defects rather than a general consequence of ciliary inflammation.","method":"IL-13 treatment of primary human respiratory epithelial cell cultures, transmission electron microscopy, high-speed videomicroscopy, immunofluorescence of nasal brushing biopsies from SCD patients","journal":"Pediatric research","confidence":"High","confidence_rationale":"Tier 2 — in vitro and in vivo experimental design with multiple methods establishing specificity of DNAH5 mislocalization to PCD","pmids":["16492982"],"is_preprint":false},{"year":2016,"finding":"DNAH6 interacts genetically with DNAH5; trans-heterozygous subthreshold siRNA knockdown of Dnah6 in heterozygous Dnah5 mutant mouse respiratory epithelia disrupts motile cilia function, and subthreshold double-morpholino knockdown in zebrafish causes heterotaxy, demonstrating an oligogenic interaction between DNAH5 and DNAH6 in cilia-dependent left-right patterning.","method":"siRNA knockdown in mouse respiratory epithelia, zebrafish double-morpholino knockdown (subthreshold epistasis), exome sequencing of heterotaxy patients","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis in two model systems, but specific molecular mechanism of interaction not fully resolved","pmids":["26918822"],"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 (normal, reversed, or bilateral expression), directly demonstrating the disease mechanism for laterality defects caused by DNAH5 deficiency at the molecular level during embryogenesis.","method":"High-speed video microscopy, immunofluorescence, in situ hybridization in Dnah5 mutant mouse embryos; genotype/phenotype correlation in 132 PCD patients","journal":"Circulation. Genomic and precision medicine","confidence":"High","confidence_rationale":"Tier 2 — direct mechanistic demonstration in mouse embryos combining functional (flow), structural (ODA absence), and signaling (Nodal) analyses","pmids":["31638833"],"is_preprint":false},{"year":2016,"finding":"A TRA2B-DNAH5 gene fusion identified in lung squamous cell carcinoma promotes malignant progression through a SIRT6-ERK1/2-MMP1 signaling axis; inhibition of ERK1/2 by selumetinib efficiently inhibits growth of lung SCC with TRA2B-DNAH5 fusion expression.","method":"Exon array analysis, molecular cloning, functional studies in cell lines, ERK1/2 inhibitor treatment","journal":"Cell research","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic pathway identified with functional rescue, single lab but multiple methods","pmids":["27670699"],"is_preprint":false},{"year":2022,"finding":"In a DNAH5-mutated PCD airway organoid model, single-cell RNA sequencing and proteomic analyses revealed abnormal ciliary function and a decreased immune response caused by DNAH5 mutation; directed induction of ciliated cells regulated by TGF-β/BMP and Notch pathways also increased expression of inflammatory cytokines, implicating these pathways in DNAH5-dependent epithelial differentiation and immune dysregulation.","method":"Airway organoid from bronchoscopic biopsy of DNAH5-mutant PCD patient, single-cell RNA sequencing, proteomics","journal":"Cells","confidence":"Low","confidence_rationale":"Tier 3 — pathway associations from omics in a single organoid model without direct functional manipulation of DNAH5","pmids":["36552777"],"is_preprint":false},{"year":2017,"finding":"Absence or mislocalization of DNAH5 from motile cilia is a common pathological phenomenon in nasal polyps with chronic airway inflammation, with DNAH5 scoring positively correlated with Lund-Mackay CT score and eosinophilic NP status, extending the functional relevance of DNAH5 axonemal localization beyond genetic PCD to acquired ciliary dysfunction.","method":"Immunofluorescence staining of DNAH5 in paraffin-embedded nasal biopsies and cytospin samples from 120 NP patients and 35 controls with semiquantitative scoring","journal":"The Laryngoscope","confidence":"Medium","confidence_rationale":"Tier 3 — large cohort direct localization study, but mechanism of mislocalization in non-genetic setting not resolved","pmids":["29148098"],"is_preprint":false}],"current_model":"DNAH5 encodes an outer dynein arm (ODA) heavy chain that is essential for cilia motility: it localizes to the proximal region of the respiratory ciliary axoneme and is required for ODA assembly; loss-of-function mutations cause mislocalization of DNAH5 to the microtubule organizing center, ODA absence, ciliary immotility, and randomization of left-right asymmetry through failure to generate or sense leftward nodal flow at the embryonic left-right organizer, while trans-heterozygous genetic interactions with other ODA genes (e.g., DNAH6, DNAI1) can further impair motile cilia function in an oligogenic manner."},"narrative":{"teleology":[{"year":2002,"claim":"Identification of DNAH5 as an outer dynein arm heavy chain whose loss-of-function mutations cause primary ciliary dyskinesia with randomized laterality established the gene's essential role in cilia motility and left-right axis determination.","evidence":"Full-length transcript characterization and mutation screening in PCD families with situs inversus","pmids":["11788826"],"confidence":"High","gaps":["Subcellular localization of DNAH5 along the axoneme not yet resolved","Mechanism by which DNAH5 absence leads to laterality defects not directly shown"]},{"year":2005,"claim":"Demonstrating that DNAH5 specifically occupies the proximal ciliary axoneme and that its complete axonemal absence causes immotility while distal-only loss permits residual motility resolved how regional ODA composition determines ciliary beat.","evidence":"High-resolution immunofluorescence and high-speed video microscopy of respiratory epithelia and sperm from PCD patients and controls","pmids":["15750039"],"confidence":"High","gaps":["Molecular basis for proximal versus distal ODA targeting unknown","Structural arrangement of DNAH5 within the ODA complex not determined"]},{"year":2006,"claim":"Large-cohort genotype-phenotype analysis confirmed that DNAH5 mutations invariably produce ODA defects by EM and that mislocalization of DNAH5 to microtubule organizing centers is a specific hallmark of genetic PCD, distinguishing it from secondary (inflammatory) ciliary dysfunction.","evidence":"Haplotype analysis, sequencing, EM, and immunofluorescence in 22 PCD patients; parallel IL-13-induced SCD model and in vivo inflammatory biopsies showing preserved DNAH5 localization","pmids":["16627867","16492982"],"confidence":"High","gaps":["Mechanism of DNAH5 retention at microtubule organizing centers when axonemal transport fails not characterized","Whether DNAH5 mislocalization occurs in all PCD genotypes not established"]},{"year":2016,"claim":"Trans-heterozygous epistasis experiments in mouse and zebrafish revealed that DNAH5 and DNAH6 interact genetically in an oligogenic manner to regulate cilia-dependent left-right patterning, extending the genetic architecture of laterality defects beyond simple Mendelian inheritance.","evidence":"Subthreshold siRNA knockdown of Dnah6 in heterozygous Dnah5 mutant mouse respiratory epithelia; double-morpholino knockdown in zebrafish causing heterotaxy","pmids":["26918822"],"confidence":"Medium","gaps":["Direct physical interaction between DNAH5 and DNAH6 proteins not demonstrated","Oligogenic thresholds in human patients not quantitatively defined"]},{"year":2019,"claim":"Direct demonstration that Dnah5 mutant mouse embryonic node monocilia lack ODA, are immotile, and fail to generate leftward nodal flow—resulting in randomized Nodal expression—closed the mechanistic gap between DNAH5 loss and laterality defects.","evidence":"High-speed video microscopy, immunofluorescence, and in situ hybridization of Nodal in Dnah5 mutant mouse embryos; genotype-phenotype correlation in 132 PCD patients","pmids":["31638833"],"confidence":"High","gaps":["Whether immotile node cilia also lose sensory function is not resolved","Contribution of DNAH5 to other motile cilia types (e.g., ependymal, fallopian) not directly tested in this model"]},{"year":null,"claim":"The structural basis of DNAH5 integration into the ODA complex, its mechanism of proximal axonemal targeting, and the full scope of oligogenic interactions modulating DNAH5-dependent ciliopathy remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No high-resolution structure of DNAH5 within the human ODA complex","Molecular determinants of proximal versus distal axonemal targeting not identified","Full network of oligogenic modifiers beyond DNAH6 not mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003774","term_label":"cytoskeletal motor activity","supporting_discovery_ids":[0,1,5]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,1,2,3,5]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[1,2]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,1,2,5]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[4,5]}],"complexes":["outer dynein arm (ODA)"],"partners":["DNAH6","DNAI1","DNAH9"],"other_free_text":[]},"mechanistic_narrative":"DNAH5 is an outer dynein arm (ODA) heavy chain essential for motile cilia function, left-right body axis determination, and mucociliary clearance. It localizes to the proximal region of the respiratory ciliary axoneme, where it is required for ODA assembly; loss-of-function mutations cause absence of outer dynein arms, mislocalization of DNAH5 to microtubule organizing centers, ciliary immotility, and randomization of left-right asymmetry through failure of nodal flow at the embryonic left-right organizer [PMID:11788826, PMID:15750039, PMID:31638833]. Complete axonemal DNAH5 deficiency produces immotile cilia, whereas partial (distal-only) loss permits residual motility, and DNAH5 interacts genetically with other ODA genes such as DNAH6 in an oligogenic manner to regulate cilia-dependent laterality signaling [PMID:15750039, PMID:26918822]. Biallelic loss-of-function mutations in DNAH5 are a major cause of primary ciliary dyskinesia with or without situs inversus [PMID:11788826, PMID:16627867]."},"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":1305,"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":403,"is_preprint":false},{"pmid":"11193023","id":"PMC_11193023","title":"Programmed cell death (PCD). 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In PCD patients with DNAH5 or DNAI1 mutations, DNAH5 is absent from the ciliary axoneme and accumulates at the microtubule-organizing centers. Cilia with complete axonemal DNAH5 deficiency are immotile, whereas cilia with only distal DNAH5 deficiency retain residual motility.\",\n      \"method\": \"High-resolution immunofluorescence imaging with specific antibodies, high-speed video microscopy, fractionation/localization in respiratory epithelial and sperm cells from PCD patients and controls\",\n      \"journal\": \"American journal of respiratory and critical care medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiments with functional consequence (motility) linked to axonemal position, blinded cohort validation\",\n      \"pmids\": [\"15750039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"In PCD patients with DNAH5 mutations, DNAH5 is mislocalized and absent throughout the ciliary axoneme (or only distally absent), with accumulation at the microtubule organizing centers; mutations cluster in five exons. DNAH5 mutations invariably produce outer dynein arm defects by electron microscopy, confirming DNAH5 as an outer dynein arm component essential for axonemal assembly.\",\n      \"method\": \"Haplotype analysis, sequencing, electron microscopy of cilia, high-resolution immunofluorescence imaging of respiratory epithelial cells from 22 patients\",\n      \"journal\": \"American journal of respiratory and critical care medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — large multi-center cohort with corroborating EM and immunofluorescence data, functionally linked mislocalization phenotype\",\n      \"pmids\": [\"16627867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Axonemal localization of DNAH5 is not altered in secondary ciliary dyskinesia (SCD) induced by IL-13 treatment or in vivo inflammation, distinguishing DNAH5 mislocalization as a specific diagnostic marker for PCD with ODA defects rather than a general consequence of ciliary inflammation.\",\n      \"method\": \"IL-13 treatment of primary human respiratory epithelial cell cultures, transmission electron microscopy, high-speed videomicroscopy, immunofluorescence of nasal brushing biopsies from SCD patients\",\n      \"journal\": \"Pediatric research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vitro and in vivo experimental design with multiple methods establishing specificity of DNAH5 mislocalization to PCD\",\n      \"pmids\": [\"16492982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DNAH6 interacts genetically with DNAH5; trans-heterozygous subthreshold siRNA knockdown of Dnah6 in heterozygous Dnah5 mutant mouse respiratory epithelia disrupts motile cilia function, and subthreshold double-morpholino knockdown in zebrafish causes heterotaxy, demonstrating an oligogenic interaction between DNAH5 and DNAH6 in cilia-dependent left-right patterning.\",\n      \"method\": \"siRNA knockdown in mouse respiratory epithelia, zebrafish double-morpholino knockdown (subthreshold epistasis), exome sequencing of heterotaxy patients\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in two model systems, but specific molecular mechanism of interaction not fully resolved\",\n      \"pmids\": [\"26918822\"],\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 (normal, reversed, or bilateral expression), directly demonstrating the disease mechanism for laterality defects caused by DNAH5 deficiency at the molecular level during embryogenesis.\",\n      \"method\": \"High-speed video microscopy, immunofluorescence, in situ hybridization in Dnah5 mutant mouse embryos; genotype/phenotype correlation in 132 PCD patients\",\n      \"journal\": \"Circulation. Genomic and precision medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct mechanistic demonstration in mouse embryos combining functional (flow), structural (ODA absence), and signaling (Nodal) analyses\",\n      \"pmids\": [\"31638833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"A TRA2B-DNAH5 gene fusion identified in lung squamous cell carcinoma promotes malignant progression through a SIRT6-ERK1/2-MMP1 signaling axis; inhibition of ERK1/2 by selumetinib efficiently inhibits growth of lung SCC with TRA2B-DNAH5 fusion expression.\",\n      \"method\": \"Exon array analysis, molecular cloning, functional studies in cell lines, ERK1/2 inhibitor treatment\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic pathway identified with functional rescue, single lab but multiple methods\",\n      \"pmids\": [\"27670699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In a DNAH5-mutated PCD airway organoid model, single-cell RNA sequencing and proteomic analyses revealed abnormal ciliary function and a decreased immune response caused by DNAH5 mutation; directed induction of ciliated cells regulated by TGF-β/BMP and Notch pathways also increased expression of inflammatory cytokines, implicating these pathways in DNAH5-dependent epithelial differentiation and immune dysregulation.\",\n      \"method\": \"Airway organoid from bronchoscopic biopsy of DNAH5-mutant PCD patient, single-cell RNA sequencing, proteomics\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — pathway associations from omics in a single organoid model without direct functional manipulation of DNAH5\",\n      \"pmids\": [\"36552777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Absence or mislocalization of DNAH5 from motile cilia is a common pathological phenomenon in nasal polyps with chronic airway inflammation, with DNAH5 scoring positively correlated with Lund-Mackay CT score and eosinophilic NP status, extending the functional relevance of DNAH5 axonemal localization beyond genetic PCD to acquired ciliary dysfunction.\",\n      \"method\": \"Immunofluorescence staining of DNAH5 in paraffin-embedded nasal biopsies and cytospin samples from 120 NP patients and 35 controls with semiquantitative scoring\",\n      \"journal\": \"The Laryngoscope\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — large cohort direct localization study, but mechanism of mislocalization in non-genetic setting not resolved\",\n      \"pmids\": [\"29148098\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DNAH5 encodes an outer dynein arm (ODA) heavy chain that is essential for cilia motility: it localizes to the proximal region of the respiratory ciliary axoneme and is required for ODA assembly; loss-of-function mutations cause mislocalization of DNAH5 to the microtubule organizing center, ODA absence, ciliary immotility, and randomization of left-right asymmetry through failure to generate or sense leftward nodal flow at the embryonic left-right organizer, while trans-heterozygous genetic interactions with other ODA genes (e.g., DNAH6, DNAI1) can further impair motile cilia function in an oligogenic manner.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"DNAH5 is an outer dynein arm (ODA) heavy chain essential for motile cilia function, left-right body axis determination, and mucociliary clearance. It localizes to the proximal region of the respiratory ciliary axoneme, where it is required for ODA assembly; loss-of-function mutations cause absence of outer dynein arms, mislocalization of DNAH5 to microtubule organizing centers, ciliary immotility, and randomization of left-right asymmetry through failure of nodal flow at the embryonic left-right organizer [PMID:11788826, PMID:15750039, PMID:31638833]. Complete axonemal DNAH5 deficiency produces immotile cilia, whereas partial (distal-only) loss permits residual motility, and DNAH5 interacts genetically with other ODA genes such as DNAH6 in an oligogenic manner to regulate cilia-dependent laterality signaling [PMID:15750039, PMID:26918822]. Biallelic loss-of-function mutations in DNAH5 are a major cause of primary ciliary dyskinesia with or without situs inversus [PMID:11788826, PMID:16627867].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Identification of DNAH5 as an outer dynein arm heavy chain whose loss-of-function mutations cause primary ciliary dyskinesia with randomized laterality established the gene's essential role in cilia motility and left-right axis determination.\",\n      \"evidence\": \"Full-length transcript characterization and mutation screening in PCD families with situs inversus\",\n      \"pmids\": [\"11788826\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Subcellular localization of DNAH5 along the axoneme not yet resolved\",\n        \"Mechanism by which DNAH5 absence leads to laterality defects not directly shown\"\n      ]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrating that DNAH5 specifically occupies the proximal ciliary axoneme and that its complete axonemal absence causes immotility while distal-only loss permits residual motility resolved how regional ODA composition determines ciliary beat.\",\n      \"evidence\": \"High-resolution immunofluorescence and high-speed video microscopy of respiratory epithelia and sperm from PCD patients and controls\",\n      \"pmids\": [\"15750039\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular basis for proximal versus distal ODA targeting unknown\",\n        \"Structural arrangement of DNAH5 within the ODA complex not determined\"\n      ]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Large-cohort genotype-phenotype analysis confirmed that DNAH5 mutations invariably produce ODA defects by EM and that mislocalization of DNAH5 to microtubule organizing centers is a specific hallmark of genetic PCD, distinguishing it from secondary (inflammatory) ciliary dysfunction.\",\n      \"evidence\": \"Haplotype analysis, sequencing, EM, and immunofluorescence in 22 PCD patients; parallel IL-13-induced SCD model and in vivo inflammatory biopsies showing preserved DNAH5 localization\",\n      \"pmids\": [\"16627867\", \"16492982\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism of DNAH5 retention at microtubule organizing centers when axonemal transport fails not characterized\",\n        \"Whether DNAH5 mislocalization occurs in all PCD genotypes not established\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Trans-heterozygous epistasis experiments in mouse and zebrafish revealed that DNAH5 and DNAH6 interact genetically in an oligogenic manner to regulate cilia-dependent left-right patterning, extending the genetic architecture of laterality defects beyond simple Mendelian inheritance.\",\n      \"evidence\": \"Subthreshold siRNA knockdown of Dnah6 in heterozygous Dnah5 mutant mouse respiratory epithelia; double-morpholino knockdown in zebrafish causing heterotaxy\",\n      \"pmids\": [\"26918822\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct physical interaction between DNAH5 and DNAH6 proteins not demonstrated\",\n        \"Oligogenic thresholds in human patients not quantitatively defined\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Direct demonstration that Dnah5 mutant mouse embryonic node monocilia lack ODA, are immotile, and fail to generate leftward nodal flow—resulting in randomized Nodal expression—closed the mechanistic gap between DNAH5 loss and laterality defects.\",\n      \"evidence\": \"High-speed video microscopy, immunofluorescence, and in situ hybridization of Nodal in Dnah5 mutant mouse embryos; genotype-phenotype correlation in 132 PCD patients\",\n      \"pmids\": [\"31638833\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether immotile node cilia also lose sensory function is not resolved\",\n        \"Contribution of DNAH5 to other motile cilia types (e.g., ependymal, fallopian) not directly tested in this model\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis of DNAH5 integration into the ODA complex, its mechanism of proximal axonemal targeting, and the full scope of oligogenic interactions modulating DNAH5-dependent ciliopathy remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No high-resolution structure of DNAH5 within the human ODA complex\",\n        \"Molecular determinants of proximal versus distal axonemal targeting not identified\",\n        \"Full network of oligogenic modifiers beyond DNAH6 not mapped\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003774\", \"supporting_discovery_ids\": [0, 1, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 1, 2, 3, 5]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 1, 2, 5]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4, 5]}\n    ],\n    \"complexes\": [\n      \"outer dynein arm (ODA)\"\n    ],\n    \"partners\": [\n      \"DNAH6\",\n      \"DNAI1\",\n      \"DNAH9\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}