{"gene":"DNAI1","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2001,"finding":"Compound heterozygous loss-of-function mutations in DNAI1 (encoding an axonemal dynein intermediate chain) cause primary ciliary dyskinesia with either situs solitus or situs inversus (Kartagener syndrome), establishing a direct mechanistic link between DNAI1-dependent ciliary function and left-right body axis determination.","method":"Genetic mutation screening and segregation analysis in PCD/KS patients; compound heterozygosity confirmed by sequencing","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — disease-causing mutations in multiple independent families with consistent phenotype; replicated across subsequent studies","pmids":["11231901"],"is_preprint":false},{"year":2006,"finding":"DNAI1 mutations are found exclusively in PCD patients with a defined outer dynein arm (ODA) ultrastructural defect (13% prevalence in ODA-defect families vs. 0% without), establishing DNAI1 as a structural component of the ciliary outer dynein arm.","method":"Mutation screening (sequencing of entire coding region) combined with electron microscopy-defined ODA defect classification in 179 unrelated PCD families","journal":"American journal of respiratory and critical care medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — large cohort with ultrastructural phenotype correlation; independently replicated across multiple studies","pmids":["16858015"],"is_preprint":false},{"year":2025,"finding":"LNP-formulated human DNAI1 mRNA delivered by aerosol to primary human bronchial epithelial cell models and nonhuman primate lungs led to detectable newly translated DNAI1 protein that was incorporated into ciliary outer dynein arms and rescued ciliary function in vitro PCD models, confirming DNAI1 protein is a key structural element of the ciliary ODA required for normal ciliary activity and mucociliary clearance.","method":"LNP-mRNA aerosol delivery to NHP lungs and human bronchial epithelial cell PCD models; DNAI1 protein detection; ciliary function rescue assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional rescue in cell-based PCD model and in vivo protein expression confirmed, single study with multiple orthogonal methods","pmids":["40294271"],"is_preprint":false},{"year":2025,"finding":"SORT-LNP delivery of Dnai1 mRNA to Dnai1 conditional knockout mouse nasopharyngeal epithelial cells led to dose-dependent DNAI1 protein production, incorporation into ciliary axonemes, and rescued ciliary beat frequency persisting over 3 weeks, demonstrating that DNAI1 incorporation into the outer dynein arm is required for normal ciliary beating.","method":"Conditional Dnai1 knockout mouse model; SORT-LNP mRNA delivery; DNAI1 protein quantification; ciliary beat frequency measurement; immunofluorescence of axonemal incorporation","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean knockout rescue with protein incorporation and functional readout, single lab, multiple orthogonal methods","pmids":["40963409"],"is_preprint":false},{"year":2024,"finding":"CRISPR-Cas9 disruption of DNAI1 in pigs caused loss of outer dynein arms from airway cilia and impaired ciliary beating, directly establishing that DNAI1 is required for outer dynein arm assembly and ciliary motility in vivo.","method":"CRISPR-Cas9 knockout pig model; transmission electron microscopy of ciliary ultrastructure; mucociliary transport assay","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean knockout with ultrastructural and functional phenotype, preprint, single study","pmids":["39229081"],"is_preprint":true},{"year":2024,"finding":"U-ExM superresolution imaging of mouse and human pancreatic islet primary cilia revealed expression of DNAI1 as a principal subunit of axonemal dynein in primary (non-motile) cilia and centrioles; shRNA knockdown confirmed specificity of the DNAI1 signal.","method":"Ultrastructure expansion microscopy (U-ExM); targeted shRNA knockdown validation","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — localization by imaging with shRNA confirmation, preprint, single study, no functional consequence established","pmids":[],"is_preprint":true}],"current_model":"DNAI1 encodes an intermediate chain subunit of the ciliary outer dynein arm (ODA); loss-of-function mutations abolish ODA assembly and ciliary motility, causing primary ciliary dyskinesia with associated left-right axis randomization, and restoration of DNAI1 protein via mRNA therapy rescues ODA incorporation and ciliary beat frequency in both cell and animal models."},"narrative":{"mechanistic_narrative":"DNAI1 encodes an intermediate chain subunit of the ciliary outer dynein arm (ODA), the macromolecular motor that powers ciliary beating [PMID:16858015]. Loss of DNAI1 abolishes ODA assembly: CRISPR-Cas9 disruption in pigs eliminated outer dynein arms from airway cilia and impaired ciliary beating in vivo [PMID:39229081], and DNAI1 mutations in humans occur exclusively in primary ciliary dyskinesia (PCD) patients with a defined ODA ultrastructural defect [PMID:16858015]. Compound heterozygous loss-of-function mutations cause PCD with randomized left-right body axis (Kartagener syndrome with situs inversus), linking DNAI1-dependent ciliary motility to laterality determination during development [PMID:11231901]. The structural dependence is reversible: restoration of DNAI1 protein by aerosolized or LNP-delivered mRNA in human bronchial epithelial PCD models, nonhuman primate lungs, and conditional knockout mice drives incorporation of newly translated DNAI1 into ciliary axonemes and rescues ciliary beat frequency [PMID:40294271, PMID:40963409].","teleology":[{"year":2001,"claim":"Established DNAI1 as a disease gene by showing that its loss-of-function couples ciliary motility to left-right axis determination, defining the gene's physiological stakes.","evidence":"Mutation screening and segregation analysis in PCD/Kartagener syndrome patients with confirmed compound heterozygosity","pmids":["11231901"],"confidence":"High","gaps":["Did not resolve which ciliary substructure DNAI1 builds","No biochemical demonstration of DNAI1 within the dynein arm","Mechanism connecting motility loss to laterality randomization not detailed"]},{"year":2006,"claim":"Localized DNAI1 function to the outer dynein arm by correlating mutations exclusively with ODA ultrastructural defects across a large PCD cohort.","evidence":"Coding-region sequencing combined with electron-microscopy ODA-defect classification in 179 unrelated PCD families","pmids":["16858015"],"confidence":"High","gaps":["Correlative genotype-ultrastructure link, not a direct knockout test of necessity","Did not address DNAI1 role in non-motile cilia"]},{"year":2024,"claim":"Provided direct causal proof that DNAI1 is required for ODA assembly and ciliary motility through targeted gene disruption in vivo.","evidence":"CRISPR-Cas9 knockout pig model with transmission electron microscopy and mucociliary transport assays (preprint)","pmids":["39229081"],"confidence":"Medium","gaps":["Preprint, single study","Mechanism of how DNAI1 nucleates or anchors the ODA not resolved"]},{"year":2024,"claim":"Detected DNAI1 in primary (non-motile) cilia and centrioles of pancreatic islets, raising a role beyond classical motile ciliary axonemes.","evidence":"Ultrastructure expansion microscopy with shRNA-knockdown specificity validation in mouse and human islets (preprint)","pmids":[],"confidence":"Low","gaps":["Localization only; no functional consequence established","Preprint, single study, no PMID","Whether DNAI1 has any role in non-motile cilia signaling unknown"]},{"year":2025,"claim":"Demonstrated that supplying DNAI1 protein is sufficient to rebuild functional ODAs, validating DNAI1 as a structural element whose deficiency is therapeutically reversible.","evidence":"LNP/SORT-LNP DNAI1 mRNA delivery to human bronchial epithelial PCD models, nonhuman primate lungs, and conditional Dnai1 knockout mice with protein detection, axonemal incorporation, and ciliary beat frequency rescue","pmids":["40294271","40963409"],"confidence":"Medium","gaps":["Durability and dosing in patient airways not established","Stoichiometry and assembly partners of DNAI1 in the ODA not defined","Single study per model system"]},{"year":null,"claim":"How DNAI1 assembles with other dynein chains and is targeted into the axoneme, and whether it has any function in non-motile primary cilia, remain open.","evidence":"No direct biochemical or structural reconstitution of the DNAI1-containing ODA in the available corpus","pmids":[],"confidence":"Low","gaps":["No structural model of DNAI1 within the ODA","Direct physical partners not biochemically defined in the timeline","Functional role in primary cilia untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[1,4]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[1,3,4]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[3,4]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[1,4]}],"complexes":["ciliary outer dynein arm"],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UI46","full_name":"Dynein axonemal intermediate chain 1","aliases":["Axonemal dynein intermediate chain 1"],"length_aa":699,"mass_kda":79.3,"function":"Component of dynein, a family of motor proteins essential for movement along microtubules (By similarity). Required for structural and functional integrity of cilia (By similarity). Part of the dynein complex of respiratory cilia","subcellular_location":"Dynein axonemal particle; Cytoplasm, cytoskeleton, cilium axoneme; Cell projection, cilium, flagellum; Cytoplasm, cytoskeleton","url":"https://www.uniprot.org/uniprotkb/Q9UI46/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DNAI1","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DNAI1","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":"618801","title":"CILIARY DYSKINESIA, PRIMARY, 45; CILD45","url":"https://www.omim.org/entry/618801"},{"mim_id":"618300","title":"CILIARY DYSKINESIA, PRIMARY, 40; CILD40","url":"https://www.omim.org/entry/618300"},{"mim_id":"614790","title":"WT1-INTERACTING PROTEIN; WTIP","url":"https://www.omim.org/entry/614790"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Primary cilium","reliability":"Supported"},{"location":"Mid piece","reliability":"Supported"},{"location":"End piece","reliability":"Supported"},{"location":"Vesicles","reliability":"Additional"},{"location":"Principal piece","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"choroid plexus","ntpm":65.4},{"tissue":"fallopian tube","ntpm":31.9},{"tissue":"testis","ntpm":31.3}],"url":"https://www.proteinatlas.org/search/DNAI1"},"hgnc":{"alias_symbol":["DIC1","PCD","CILD1","oda6"],"prev_symbol":[]},"alphafold":{"accession":"Q9UI46","domains":[{"cath_id":"2.130.10.10","chopping":"308-483_492-666_674-697","consensus_level":"high","plddt":92.1964,"start":308,"end":697}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UI46","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UI46-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UI46-F1-predicted_aligned_error_v6.png","plddt_mean":79.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DNAI1","jax_strain_url":"https://www.jax.org/strain/search?query=DNAI1"},"sequence":{"accession":"Q9UI46","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UI46.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UI46/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UI46"}},"corpus_meta":[{"pmid":"11231901","id":"PMC_11231901","title":"Axonemal dynein intermediate-chain gene (DNAI1) mutations result in situs inversus and primary ciliary dyskinesia (Kartagener syndrome).","date":"2001","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/11231901","citation_count":196,"is_preprint":false},{"pmid":"16858015","id":"PMC_16858015","title":"Mutations of DNAI1 in primary ciliary dyskinesia: evidence of founder effect in a common mutation.","date":"2006","source":"American journal of respiratory and critical care medicine","url":"https://pubmed.ncbi.nlm.nih.gov/16858015","citation_count":145,"is_preprint":false},{"pmid":"14752661","id":"PMC_14752661","title":"Cloning and characterization of the histidine kinase gene Dic1 from Cochliobolus heterostrophus that confers dicarboximide resistance and osmotic adaptation.","date":"2004","source":"Molecular genetics and genomics : MGG","url":"https://pubmed.ncbi.nlm.nih.gov/14752661","citation_count":66,"is_preprint":false},{"pmid":"18434704","id":"PMC_18434704","title":"DNAI1 mutations explain only 2% of primary ciliary dykinesia.","date":"2008","source":"Respiration; international review of thoracic diseases","url":"https://pubmed.ncbi.nlm.nih.gov/18434704","citation_count":35,"is_preprint":false},{"pmid":"22416021","id":"PMC_22416021","title":"Effectiveness of sequencing selected exons of DNAH5 and DNAI1 in diagnosis of primary ciliary dyskinesia.","date":"2012","source":"Pediatric pulmonology","url":"https://pubmed.ncbi.nlm.nih.gov/22416021","citation_count":32,"is_preprint":false},{"pmid":"21143860","id":"PMC_21143860","title":"Population specificity of the DNAI1 gene mutation spectrum in primary ciliary dyskinesia (PCD).","date":"2010","source":"Respiratory research","url":"https://pubmed.ncbi.nlm.nih.gov/21143860","citation_count":28,"is_preprint":false},{"pmid":"9809037","id":"PMC_9809037","title":"Myelodysplastic syndrome with hypereosinophilia and a nonrandom chromosomal abnormality dic(1;7): confirmation of eosinophil clonal involvement by fluorescence in situ hybridization.","date":"1998","source":"Cancer genetics and cytogenetics","url":"https://pubmed.ncbi.nlm.nih.gov/9809037","citation_count":26,"is_preprint":false},{"pmid":"19210547","id":"PMC_19210547","title":"DIC-1 over-expression enhances respiratory activity in Caenorhabditis elegans by promoting mitochondrial cristae formation.","date":"2009","source":"Genes to cells : devoted to molecular & cellular mechanisms","url":"https://pubmed.ncbi.nlm.nih.gov/19210547","citation_count":10,"is_preprint":false},{"pmid":"40294271","id":"PMC_40294271","title":"Inhaled DNAI1 mRNA therapy for treatment of primary ciliary dyskinesia.","date":"2025","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/40294271","citation_count":8,"is_preprint":false},{"pmid":"40963409","id":"PMC_40963409","title":"Lipid nanoparticle-encapsulated Dnai1 mRNA rescues ciliary activity in primary ciliary dyskinesia mouse cell models.","date":"2025","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/40963409","citation_count":3,"is_preprint":false},{"pmid":"11890996","id":"PMC_11890996","title":"A novel dic(1;10) in a patient with myelodysplastic syndrome.","date":"2002","source":"Cancer genetics and cytogenetics","url":"https://pubmed.ncbi.nlm.nih.gov/11890996","citation_count":2,"is_preprint":false},{"pmid":"39229081","id":"PMC_39229081","title":"Development and Initial Characterization of Pigs with DNAI1 Mutations and Primary Ciliary Dyskinesia.","date":"2024","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/39229081","citation_count":1,"is_preprint":false},{"pmid":"23533845","id":"PMC_23533845","title":"A New Case of dic(1;15)(p11;p11) in AML M1: Apropos of a Case and a Review of the Literature.","date":"2013","source":"Case reports in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/23533845","citation_count":1,"is_preprint":false},{"pmid":"38311768","id":"PMC_38311768","title":"Absolute quantitation of human wild-type DNAI1 protein in lung tissue using a nanoLC-PRM-MS-based targeted proteomics approach coupled with immunoprecipitation.","date":"2024","source":"Clinical proteomics","url":"https://pubmed.ncbi.nlm.nih.gov/38311768","citation_count":0,"is_preprint":false},{"pmid":"41453193","id":"PMC_41453193","title":"Variant of uncertain significance in the DNAI1 gene in a child with typical primary ciliary dyskinesia phenotype.","date":"2025","source":"Boletin medico del Hospital Infantil de Mexico","url":"https://pubmed.ncbi.nlm.nih.gov/41453193","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.04.08.647777","title":"COP9 signalosome and PRMT5 methylosome complexes are essential regulators of Lis1-dynein based transport","date":"2025-04-08","source":"bioRxiv","url":"https://doi.org/10.1101/2025.04.08.647777","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.09.06.611752","title":"Ultrastructure expansion microscopy of axonemal dynein in islet primary cilia","date":"2024-09-07","source":"bioRxiv","url":"https://doi.org/10.1101/2024.09.06.611752","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":10018,"output_tokens":1424,"usd":0.025707,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8212,"output_tokens":2046,"usd":0.046105,"stage2_stop_reason":"end_turn"},"total_usd":0.071812,"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\": 2001,\n      \"finding\": \"Compound heterozygous loss-of-function mutations in DNAI1 (encoding an axonemal dynein intermediate chain) cause primary ciliary dyskinesia with either situs solitus or situs inversus (Kartagener syndrome), establishing a direct mechanistic link between DNAI1-dependent ciliary function and left-right body axis determination.\",\n      \"method\": \"Genetic mutation screening and segregation analysis in PCD/KS patients; compound heterozygosity confirmed by sequencing\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — disease-causing mutations in multiple independent families with consistent phenotype; replicated across subsequent studies\",\n      \"pmids\": [\"11231901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"DNAI1 mutations are found exclusively in PCD patients with a defined outer dynein arm (ODA) ultrastructural defect (13% prevalence in ODA-defect families vs. 0% without), establishing DNAI1 as a structural component of the ciliary outer dynein arm.\",\n      \"method\": \"Mutation screening (sequencing of entire coding region) combined with electron microscopy-defined ODA defect classification in 179 unrelated PCD families\",\n      \"journal\": \"American journal of respiratory and critical care medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — large cohort with ultrastructural phenotype correlation; independently replicated across multiple studies\",\n      \"pmids\": [\"16858015\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LNP-formulated human DNAI1 mRNA delivered by aerosol to primary human bronchial epithelial cell models and nonhuman primate lungs led to detectable newly translated DNAI1 protein that was incorporated into ciliary outer dynein arms and rescued ciliary function in vitro PCD models, confirming DNAI1 protein is a key structural element of the ciliary ODA required for normal ciliary activity and mucociliary clearance.\",\n      \"method\": \"LNP-mRNA aerosol delivery to NHP lungs and human bronchial epithelial cell PCD models; DNAI1 protein detection; ciliary function rescue assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional rescue in cell-based PCD model and in vivo protein expression confirmed, single study with multiple orthogonal methods\",\n      \"pmids\": [\"40294271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SORT-LNP delivery of Dnai1 mRNA to Dnai1 conditional knockout mouse nasopharyngeal epithelial cells led to dose-dependent DNAI1 protein production, incorporation into ciliary axonemes, and rescued ciliary beat frequency persisting over 3 weeks, demonstrating that DNAI1 incorporation into the outer dynein arm is required for normal ciliary beating.\",\n      \"method\": \"Conditional Dnai1 knockout mouse model; SORT-LNP mRNA delivery; DNAI1 protein quantification; ciliary beat frequency measurement; immunofluorescence of axonemal incorporation\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean knockout rescue with protein incorporation and functional readout, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"40963409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CRISPR-Cas9 disruption of DNAI1 in pigs caused loss of outer dynein arms from airway cilia and impaired ciliary beating, directly establishing that DNAI1 is required for outer dynein arm assembly and ciliary motility in vivo.\",\n      \"method\": \"CRISPR-Cas9 knockout pig model; transmission electron microscopy of ciliary ultrastructure; mucociliary transport assay\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean knockout with ultrastructural and functional phenotype, preprint, single study\",\n      \"pmids\": [\"39229081\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"U-ExM superresolution imaging of mouse and human pancreatic islet primary cilia revealed expression of DNAI1 as a principal subunit of axonemal dynein in primary (non-motile) cilia and centrioles; shRNA knockdown confirmed specificity of the DNAI1 signal.\",\n      \"method\": \"Ultrastructure expansion microscopy (U-ExM); targeted shRNA knockdown validation\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — localization by imaging with shRNA confirmation, preprint, single study, no functional consequence established\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"DNAI1 encodes an intermediate chain subunit of the ciliary outer dynein arm (ODA); loss-of-function mutations abolish ODA assembly and ciliary motility, causing primary ciliary dyskinesia with associated left-right axis randomization, and restoration of DNAI1 protein via mRNA therapy rescues ODA incorporation and ciliary beat frequency in both cell and animal models.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DNAI1 encodes an intermediate chain subunit of the ciliary outer dynein arm (ODA), the macromolecular motor that powers ciliary beating [#1]. Loss of DNAI1 abolishes ODA assembly: CRISPR-Cas9 disruption in pigs eliminated outer dynein arms from airway cilia and impaired ciliary beating in vivo [#4], and DNAI1 mutations in humans occur exclusively in primary ciliary dyskinesia (PCD) patients with a defined ODA ultrastructural defect [#1]. Compound heterozygous loss-of-function mutations cause PCD with randomized left-right body axis (Kartagener syndrome with situs inversus), linking DNAI1-dependent ciliary motility to laterality determination during development [#0]. The structural dependence is reversible: restoration of DNAI1 protein by aerosolized or LNP-delivered mRNA in human bronchial epithelial PCD models, nonhuman primate lungs, and conditional knockout mice drives incorporation of newly translated DNAI1 into ciliary axonemes and rescues ciliary beat frequency [#2, #3].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established DNAI1 as a disease gene by showing that its loss-of-function couples ciliary motility to left-right axis determination, defining the gene's physiological stakes.\",\n      \"evidence\": \"Mutation screening and segregation analysis in PCD/Kartagener syndrome patients with confirmed compound heterozygosity\",\n      \"pmids\": [\"11231901\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Did not resolve which ciliary substructure DNAI1 builds\",\n        \"No biochemical demonstration of DNAI1 within the dynein arm\",\n        \"Mechanism connecting motility loss to laterality randomization not detailed\"\n      ]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Localized DNAI1 function to the outer dynein arm by correlating mutations exclusively with ODA ultrastructural defects across a large PCD cohort.\",\n      \"evidence\": \"Coding-region sequencing combined with electron-microscopy ODA-defect classification in 179 unrelated PCD families\",\n      \"pmids\": [\"16858015\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Correlative genotype-ultrastructure link, not a direct knockout test of necessity\",\n        \"Did not address DNAI1 role in non-motile cilia\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Provided direct causal proof that DNAI1 is required for ODA assembly and ciliary motility through targeted gene disruption in vivo.\",\n      \"evidence\": \"CRISPR-Cas9 knockout pig model with transmission electron microscopy and mucociliary transport assays (preprint)\",\n      \"pmids\": [\"39229081\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Preprint, single study\",\n        \"Mechanism of how DNAI1 nucleates or anchors the ODA not resolved\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Detected DNAI1 in primary (non-motile) cilia and centrioles of pancreatic islets, raising a role beyond classical motile ciliary axonemes.\",\n      \"evidence\": \"Ultrastructure expansion microscopy with shRNA-knockdown specificity validation in mouse and human islets (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Localization only; no functional consequence established\",\n        \"Preprint, single study, no PMID\",\n        \"Whether DNAI1 has any role in non-motile cilia signaling unknown\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated that supplying DNAI1 protein is sufficient to rebuild functional ODAs, validating DNAI1 as a structural element whose deficiency is therapeutically reversible.\",\n      \"evidence\": \"LNP/SORT-LNP DNAI1 mRNA delivery to human bronchial epithelial PCD models, nonhuman primate lungs, and conditional Dnai1 knockout mice with protein detection, axonemal incorporation, and ciliary beat frequency rescue\",\n      \"pmids\": [\"40294271\", \"40963409\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Durability and dosing in patient airways not established\",\n        \"Stoichiometry and assembly partners of DNAI1 in the ODA not defined\",\n        \"Single study per model system\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DNAI1 assembles with other dynein chains and is targeted into the axoneme, and whether it has any function in non-motile primary cilia, remain open.\",\n      \"evidence\": \"No direct biochemical or structural reconstitution of the DNAI1-containing ODA in the available corpus\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural model of DNAI1 within the ODA\",\n        \"Direct physical partners not biochemically defined in the timeline\",\n        \"Functional role in primary cilia untested\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [1, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [1, 3, 4]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [1, 4]}\n    ],\n    \"complexes\": [\"ciliary outer dynein arm\"],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":4,"faith_pct":100.0}}