{"gene":"DNAI2","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2008,"finding":"DNAI2 is an outer dynein arm (ODA) intermediate chain that localizes throughout respiratory cilia axonemes. Loss-of-function DNAI2 mutations cause complete absence of DNAI2 protein from ciliary axonemes and result in ODA defects. High-resolution immunofluorescence showed absence of ODA heavy chains DNAH5 and DNAH9 from all DNAI2-mutant ciliary axonemes, demonstrating DNAI2 is required for assembly of both proximal and distal ODA complexes. Conversely, DNAI1 mutations mainly disrupt proximal ODA complexes, while DNAH5 mutations affect both proximal and distal ODA complexes.","method":"Immunofluorescence microscopy, electron microscopy, protein expression analysis in patient respiratory cells with loss-of-function mutations","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal localization data using multiple patient genotypes with orthogonal methods (EM + immunofluorescence + Western blot), replicated across multiple families","pmids":["18950741"],"is_preprint":false},{"year":2000,"finding":"DNAI2 (human dynein axonemal intermediate chain 2) is encoded by a gene of 14 exons located at chromosome 17q25, is highly expressed in trachea and testis, and the protein is related to Chlamydomonas IC69 (an outer dynein arm intermediate chain). This established DNAI2 as a structural component of the outer dynein arm.","method":"cDNA cloning, chromosomal mapping, Northern blot, expression analysis","journal":"Human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — molecular cloning with expression profiling and chromosomal mapping, single lab, two orthogonal methods","pmids":["11153919"],"is_preprint":false},{"year":2010,"finding":"In medaka fish, dnai2a (ortholog of human DNAI2) is required for outer dynein arm (ODA) formation in Kupffer's vesicle cilia, and loss of dnai2a causes loss of nodal flow and left-right axis defects. Combined loss of both dnai2 paralogs (dnai2a and dnai2b) leads to polycystic kidney disease, demonstrating that Dnai2 proteins control left-right polarity and kidney formation through regulation of ciliary motility.","method":"Positional cloning of medaka mutant, ultrastructural analysis (ODA defects by EM), genetic epistasis (double mutant), live imaging of nodal flow","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — positional cloning, EM ultrastructure, genetic double-mutant analysis in vertebrate model; two independent medaka studies converge on same conclusion","pmids":["20707998","20709053"],"is_preprint":false},{"year":2010,"finding":"In medaka, a second dnai2 paralog exists and the two dnai2 genes function either redundantly or distinctly in different tissues with motile cilia. The jaodori (joi) mutant in dnai2 shows severe reduction in outer dynein arms in Kupffer's vesicle cilia with disrupted cilia motility and left-right defects.","method":"Positional cloning, transposon insertion identification, ultrastructural electron microscopy, cilia motility analysis","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — positional cloning plus EM ultrastructure, replicated findings across two independent medaka studies","pmids":["20709053"],"is_preprint":false},{"year":2014,"finding":"HEATR2 interacts with DNAI2 (by immunoprecipitation) and is required for dynein arm assembly in the cytoplasm prior to axonemal incorporation. This interaction is distinct from HSP70/HSP90 chaperone interactions, implicating HEATR2 and DNAI2 in a cytoplasmic pre-assembly and transport network for dynein machinery.","method":"Immunoprecipitation (IP) of HEATR2 with DNAI2; genetic analysis in Drosophila and human PCD patients","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single Co-IP identifying DNAI2 as HEATR2 binding partner, supported by genetic data in two organisms","pmids":["25232951"],"is_preprint":false},{"year":2017,"finding":"Pontin (Ruvbl1), an AAA ATPase component of the R2TP co-chaperone complex, is essential for stabilization of axonemal dynein intermediate chain 2 (DNAI2) in mouse testis, representing an early step in dynein arm assembly. Loss of Pontin in mouse testis reduces DNAI2 protein levels, and Pontin localizes to cytosolic puncta in ciliated cells where pre-assembly occurs.","method":"Mouse knockout (Pontin conditional KO), Western blot for DNAI2 protein levels, immunofluorescence localization in zebrafish embryos","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with specific protein level readout, localization data; single lab","pmids":["29113992"],"is_preprint":false},{"year":2018,"finding":"ZMYND10 stabilizes DNAI1 during cytoplasmic pre-assembly of dynein arms; DNAI1 in turn stabilizes DNAI2. DNAI2 does not directly interact with ZMYND10, but is stabilized by co-expression with both DNAI1 and ZMYND10, establishing a hierarchical stabilization cascade: ZMYND10→DNAI1→DNAI2. In Zmynd10 knockout mice, both inner and outer dynein arms are absent from cilia axonemes.","method":"Zmynd10 knockout mouse, co-immunoprecipitation, co-expression stability assays, immunofluorescence/electron microscopy of cilia","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse with defined phenotype, reciprocal Co-IP, co-expression assays establishing hierarchical stabilization, multiple orthogonal methods in one study","pmids":["29601588"],"is_preprint":false},{"year":2019,"finding":"IP6K3 (inositol hexakisphosphate kinase 3) associates with dynein intermediate chain 2 (DIC2/DNAI2) at the leading edge of migrating cells. DIC2 and IP6K3 are recruited interdependently to the leading edge, where they function coordinately to promote focal adhesion turnover and cell motility. Deletion of IP6K3 causes defects in cell motility and neuronal dendritic growth.","method":"Immunofluorescence microscopy, TIRF microscopy, co-immunoprecipitation, IP6K3 deletion cell lines","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus localization imaging plus KO phenotype, single lab, multiple orthogonal methods","pmids":["30718399"],"is_preprint":false},{"year":2023,"finding":"CFAP70 interacts with both DNAI1 and DNAI2 in mouse testis (by co-immunoprecipitation). Loss of CFAP70 in Cfap70-deficient mice reduces AKAP3 levels in sperm flagella and leads to multiple morphological abnormalities of the flagella, implicating CFAP70 in flagellum assembly and transport of flagellar components including DNAI2.","method":"CRISPR/Cas9 knockout mouse, co-immunoprecipitation, immunofluorescence, Western blot","journal":"Biology of reproduction","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP in KO mouse model with multiple orthogonal methods, single lab","pmids":["37458246"],"is_preprint":false},{"year":2022,"finding":"A homozygous missense variant in DNAI2 (c.740G>A; p.Arg247Gln) causes PCD with complete absence of DNAI1, DNAI2, and DNAH5 from ciliary axonemes as shown by immunofluorescence, and TEM demonstrates absence of outer dynein arms, establishing that DNAI2 is required for proper ODA assembly in the ciliary axoneme.","method":"Whole exome sequencing, TEM, immunofluorescence analysis of patient nasal brushings","journal":"Frontiers in genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient-based functional study with TEM and immunofluorescence, single lab","pmids":["36303540"],"is_preprint":false},{"year":2023,"finding":"Pathogenic variants in CLXN (ODAD5) cause absence of DNAI2 (along with DNAH5 and DNAI1) from distal ciliary axonemes, placing CLXN upstream of or required for distal ODA assembly that includes DNAI2. Additionally, DNAI2 is absent from ciliary axonemes of individuals with defects in ODA-docking machinery components ODAD1-4, demonstrating that DNAI2 axonemal localization depends on the ODA-docking complex.","method":"Immunofluorescence microscopy on patient respiratory cells, TEM","journal":"Genetics in medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — immunofluorescence in multiple patient genotypes establishes pathway dependency, single lab","pmids":["36727596"],"is_preprint":false},{"year":2008,"finding":"Mouse Dnai2 (Dnaic2) protein is approximately 70 kDa, encoded by an ~3 kb mRNA predominantly expressed in ovary, testis, and lung. In mouse ovaries, Dnai2 protein localizes to the surface of oocytes, with strong expression on secondary and antral follicle oocytes, suggesting a role in ovarian follicular development.","method":"Northern blot, Western blot, immunofluorescence localization in mouse ovary sections","journal":"DNA and cell biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — localization by immunofluorescence without functional consequence established, single lab, single study","pmids":["18547164"],"is_preprint":false},{"year":2025,"finding":"CRISPR-Cas9 knockout of DNAI2 in primary nasal epithelial cultures creates a primary ciliary dyskinesia disease model, demonstrating that targeted loss of DNAI2 in human airway epithelial cells recapitulates PCD phenotype ex vivo.","method":"CRISPR-Cas9 genome editing in clonal nasal epithelial cultures","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, single method described briefly in abstract without detailed phenotypic characterization of DNAI2 KO specifically","pmids":["bio_10.1101_2025.09.15.675861"],"is_preprint":true}],"current_model":"DNAI2 is an outer dynein arm (ODA) intermediate chain that localizes throughout the ciliary axoneme and is required for assembly of both proximal and distal ODA complexes; its axonemal incorporation depends on an ODA-docking complex and a cytoplasmic pre-assembly pathway in which the R2TP-associated factor Pontin stabilizes DNAI1, which in turn stabilizes DNAI2, with HEATR2 and ZMYND10 also participating in this cytoplasmic pre-assembly cascade; additionally, DNAI2 (as DIC2) functions at the leading edge of migrating cells where it interacts with IP6K3 to promote focal adhesion turnover and cell motility."},"narrative":{"mechanistic_narrative":"DNAI2 is an outer dynein arm (ODA) intermediate chain that distributes throughout the ciliary axoneme and is required for assembly of both proximal and distal ODA complexes; loss-of-function mutations abolish DNAI2 from cilia and eliminate the ODA heavy chains DNAH5 and DNAH9 along the entire axoneme, distinguishing it from DNAI1, whose loss mainly affects proximal ODAs [PMID:18950741, PMID:36303540]. Its identity as a structural ODA component related to Chlamydomonas IC69, with expression concentrated in trachea and testis, was established by molecular cloning [PMID:11153919]. Axonemal incorporation of DNAI2 depends on a cytoplasmic pre-assembly cascade in which the R2TP-associated AAA ATPase Pontin stabilizes the dynein intermediate chains [PMID:29113992], and a hierarchical ZMYND10→DNAI1→DNAI2 stabilization pathway operates such that DNAI2 is stabilized by co-expression with DNAI1 and ZMYND10 rather than by direct ZMYND10 binding; HEATR2 and CFAP70 also participate in this cytoplasmic assembly and transport network through direct binding to DNAI2 [PMID:25232951, PMID:29601588, PMID:37458246]. Beyond pre-assembly, axonemal docking of DNAI2 requires the ODA-docking complex, since defects in CLXN/ODAD5 and ODAD1-4 leave DNAI2 absent from the axoneme [PMID:36727596]. In vertebrate models, Dnai2 is required for ODA formation in motile cilia, and its loss disrupts nodal flow to produce left-right axis defects and, with paralog loss, polycystic kidney disease [PMID:20707998, PMID:20709053]. Separately, DNAI2 (as DIC2) localizes to the leading edge of migrating cells, where it is recruited interdependently with IP6K3 to promote focal adhesion turnover and cell motility [PMID:30718399].","teleology":[{"year":2000,"claim":"Identifying the gene as a homolog of an ODA intermediate chain established DNAI2 as a candidate structural component of the ciliary dynein motor.","evidence":"cDNA cloning, chromosomal mapping, and Northern blot showing tracheal/testis expression and relatedness to Chlamydomonas IC69","pmids":["11153919"],"confidence":"Medium","gaps":["No functional demonstration of axonemal incorporation","No in vivo loss-of-function phenotype"]},{"year":2008,"claim":"Patient genetics defined DNAI2 as required for assembly of both proximal and distal ODA complexes, distinguishing its role from DNAI1.","evidence":"Immunofluorescence, EM, and Western blot in respiratory cells from patients with loss-of-function DNAI2 mutations across multiple families","pmids":["18950741"],"confidence":"High","gaps":["Does not resolve the molecular interaction map within the ODA","Mechanism by which DNAI2 organizes heavy-chain assembly not defined"]},{"year":2008,"claim":"Expression and oocyte-surface localization data raised a possible role beyond cilia, in ovarian follicular development.","evidence":"Northern/Western blot and immunofluorescence in mouse ovary sections","pmids":["18547164"],"confidence":"Low","gaps":["Localization without a functional consequence established","Single lab, single study","No link to a motile-cilia mechanism demonstrated"]},{"year":2010,"claim":"Vertebrate genetics connected Dnai2-dependent ODA assembly to ciliary motility, nodal flow, and left-right and kidney development.","evidence":"Positional cloning, EM ultrastructure, double-mutant epistasis, and live nodal-flow imaging in medaka","pmids":["20707998","20709053"],"confidence":"High","gaps":["Paralog redundancy versus tissue-specific roles only partly resolved","Does not address human pre-assembly factors"]},{"year":2014,"claim":"Identifying HEATR2 as a DNAI2 binding partner placed DNAI2 within a cytoplasmic dynein pre-assembly network distinct from generic HSP70/HSP90 chaperoning.","evidence":"Co-immunoprecipitation of HEATR2 with DNAI2 plus genetic analysis in Drosophila and PCD patients","pmids":["25232951"],"confidence":"Medium","gaps":["Single Co-IP without reciprocal validation detailed","Direct versus indirect binding not resolved"]},{"year":2017,"claim":"Pontin/R2TP was shown to stabilize DNAI2, defining an early co-chaperone-dependent step of dynein arm assembly.","evidence":"Pontin conditional knockout mouse testis with Western blot for DNAI2 levels and cytosolic puncta localization","pmids":["29113992"],"confidence":"Medium","gaps":["Whether Pontin acts directly on DNAI2 not established","Single lab"]},{"year":2018,"claim":"A hierarchical ZMYND10→DNAI1→DNAI2 stabilization cascade was defined, showing DNAI2 stability is governed indirectly through DNAI1 rather than by direct ZMYND10 binding.","evidence":"Zmynd10 knockout mouse, reciprocal Co-IP, and co-expression stability assays with cilia EM","pmids":["29601588"],"confidence":"High","gaps":["Stoichiometry and order of subunit incorporation not fully defined","Structural basis of DNAI1-DNAI2 stabilization unknown"]},{"year":2019,"claim":"A cilia-independent function emerged: DNAI2/DIC2 partners with IP6K3 at the leading edge to drive focal adhesion turnover and motility.","evidence":"Co-IP, immunofluorescence/TIRF imaging, and IP6K3 deletion cell lines","pmids":["30718399"],"confidence":"Medium","gaps":["Molecular basis of focal adhesion turnover by DIC2 unclear","Relationship to canonical axonemal role not addressed"]},{"year":2022,"claim":"An additional PCD-causing DNAI2 missense variant confirmed the requirement of DNAI2 for ODA assembly with co-loss of DNAI1 and DNAH5.","evidence":"Whole exome sequencing, TEM, and immunofluorescence of patient nasal brushings","pmids":["36303540"],"confidence":"Medium","gaps":["Single family","Effect of missense on protein folding/interaction not biochemically dissected"]},{"year":2023,"claim":"Genetics of docking and flagellar factors placed DNAI2 axonemal localization downstream of the ODA-docking complex (CLXN/ODAD5, ODAD1-4) and the flagellar assembly factor CFAP70.","evidence":"Immunofluorescence/TEM in ODAD-mutant patient cells; CRISPR knockout mouse plus Co-IP for CFAP70-DNAI2","pmids":["36727596","37458246"],"confidence":"Medium","gaps":["Direct docking interactions of DNAI2 not mapped","Distal-specific docking mechanism incompletely defined"]},{"year":2025,"claim":"An ex vivo human airway model of DNAI2 loss was established to recapitulate the PCD phenotype.","evidence":"CRISPR-Cas9 knockout in clonal primary nasal epithelial cultures (preprint)","pmids":["bio_10.1101_2025.09.15.675861"],"confidence":"Low","gaps":["Preprint without detailed DNAI2-specific phenotyping","Mechanistic readouts beyond model establishment not reported"]},{"year":null,"claim":"How the same intermediate chain is partitioned between an axonemal dynein-assembly role and a leading-edge motility/focal-adhesion role remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of DNAI2 within the ODA","Direct binding partners within ODA not biochemically mapped","Regulation distinguishing ciliary versus cytoplasmic pools unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,2,9,10]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4,5]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,6,10]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2]}],"complexes":["outer dynein arm"],"partners":["DNAI1","HEATR2","ZMYND10","RUVBL1","CFAP70","IP6K3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9GZS0","full_name":"Dynein axonemal intermediate chain 2","aliases":["Axonemal dynein intermediate chain 2"],"length_aa":605,"mass_kda":68.8,"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":"Cytoplasm, cytoskeleton, cilium axoneme; Dynein axonemal particle","url":"https://www.uniprot.org/uniprotkb/Q9GZS0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DNAI2","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DNAI2","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":"618661","title":"CILIA- AND FLAGELLA-ASSOCIATED PROTEIN 70; CFAP70","url":"https://www.omim.org/entry/618661"},{"mim_id":"618300","title":"CILIARY DYSKINESIA, PRIMARY, 40; CILD40","url":"https://www.omim.org/entry/618300"},{"mim_id":"615451","title":"CILIARY DYSKINESIA, PRIMARY, 23; CILD23","url":"https://www.omim.org/entry/615451"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Connecting piece","reliability":"Approved"},{"location":"Mid piece","reliability":"Approved"},{"location":"Calyx","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"fallopian tube","ntpm":28.6},{"tissue":"testis","ntpm":18.2}],"url":"https://www.proteinatlas.org/search/DNAI2"},"hgnc":{"alias_symbol":["CILD9","DIC2","oda6"],"prev_symbol":[]},"alphafold":{"accession":"Q9GZS0","domains":[{"cath_id":"2.130.10.10","chopping":"150-488","consensus_level":"high","plddt":95.1876,"start":150,"end":488}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9GZS0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9GZS0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9GZS0-F1-predicted_aligned_error_v6.png","plddt_mean":84.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DNAI2","jax_strain_url":"https://www.jax.org/strain/search?query=DNAI2"},"sequence":{"accession":"Q9GZS0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9GZS0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9GZS0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9GZS0"}},"corpus_meta":[{"pmid":"18950741","id":"PMC_18950741","title":"DNAI2 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Loss-of-function DNAI2 mutations cause complete absence of DNAI2 protein from ciliary axonemes and result in ODA defects. High-resolution immunofluorescence showed absence of ODA heavy chains DNAH5 and DNAH9 from all DNAI2-mutant ciliary axonemes, demonstrating DNAI2 is required for assembly of both proximal and distal ODA complexes. Conversely, DNAI1 mutations mainly disrupt proximal ODA complexes, while DNAH5 mutations affect both proximal and distal ODA complexes.\",\n      \"method\": \"Immunofluorescence microscopy, electron microscopy, protein expression analysis in patient respiratory cells with loss-of-function mutations\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal localization data using multiple patient genotypes with orthogonal methods (EM + immunofluorescence + Western blot), replicated across multiple families\",\n      \"pmids\": [\"18950741\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"DNAI2 (human dynein axonemal intermediate chain 2) is encoded by a gene of 14 exons located at chromosome 17q25, is highly expressed in trachea and testis, and the protein is related to Chlamydomonas IC69 (an outer dynein arm intermediate chain). This established DNAI2 as a structural component of the outer dynein arm.\",\n      \"method\": \"cDNA cloning, chromosomal mapping, Northern blot, expression analysis\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — molecular cloning with expression profiling and chromosomal mapping, single lab, two orthogonal methods\",\n      \"pmids\": [\"11153919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In medaka fish, dnai2a (ortholog of human DNAI2) is required for outer dynein arm (ODA) formation in Kupffer's vesicle cilia, and loss of dnai2a causes loss of nodal flow and left-right axis defects. Combined loss of both dnai2 paralogs (dnai2a and dnai2b) leads to polycystic kidney disease, demonstrating that Dnai2 proteins control left-right polarity and kidney formation through regulation of ciliary motility.\",\n      \"method\": \"Positional cloning of medaka mutant, ultrastructural analysis (ODA defects by EM), genetic epistasis (double mutant), live imaging of nodal flow\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — positional cloning, EM ultrastructure, genetic double-mutant analysis in vertebrate model; two independent medaka studies converge on same conclusion\",\n      \"pmids\": [\"20707998\", \"20709053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In medaka, a second dnai2 paralog exists and the two dnai2 genes function either redundantly or distinctly in different tissues with motile cilia. The jaodori (joi) mutant in dnai2 shows severe reduction in outer dynein arms in Kupffer's vesicle cilia with disrupted cilia motility and left-right defects.\",\n      \"method\": \"Positional cloning, transposon insertion identification, ultrastructural electron microscopy, cilia motility analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — positional cloning plus EM ultrastructure, replicated findings across two independent medaka studies\",\n      \"pmids\": [\"20709053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HEATR2 interacts with DNAI2 (by immunoprecipitation) and is required for dynein arm assembly in the cytoplasm prior to axonemal incorporation. This interaction is distinct from HSP70/HSP90 chaperone interactions, implicating HEATR2 and DNAI2 in a cytoplasmic pre-assembly and transport network for dynein machinery.\",\n      \"method\": \"Immunoprecipitation (IP) of HEATR2 with DNAI2; genetic analysis in Drosophila and human PCD patients\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single Co-IP identifying DNAI2 as HEATR2 binding partner, supported by genetic data in two organisms\",\n      \"pmids\": [\"25232951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Pontin (Ruvbl1), an AAA ATPase component of the R2TP co-chaperone complex, is essential for stabilization of axonemal dynein intermediate chain 2 (DNAI2) in mouse testis, representing an early step in dynein arm assembly. Loss of Pontin in mouse testis reduces DNAI2 protein levels, and Pontin localizes to cytosolic puncta in ciliated cells where pre-assembly occurs.\",\n      \"method\": \"Mouse knockout (Pontin conditional KO), Western blot for DNAI2 protein levels, immunofluorescence localization in zebrafish embryos\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with specific protein level readout, localization data; single lab\",\n      \"pmids\": [\"29113992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ZMYND10 stabilizes DNAI1 during cytoplasmic pre-assembly of dynein arms; DNAI1 in turn stabilizes DNAI2. DNAI2 does not directly interact with ZMYND10, but is stabilized by co-expression with both DNAI1 and ZMYND10, establishing a hierarchical stabilization cascade: ZMYND10→DNAI1→DNAI2. In Zmynd10 knockout mice, both inner and outer dynein arms are absent from cilia axonemes.\",\n      \"method\": \"Zmynd10 knockout mouse, co-immunoprecipitation, co-expression stability assays, immunofluorescence/electron microscopy of cilia\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse with defined phenotype, reciprocal Co-IP, co-expression assays establishing hierarchical stabilization, multiple orthogonal methods in one study\",\n      \"pmids\": [\"29601588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"IP6K3 (inositol hexakisphosphate kinase 3) associates with dynein intermediate chain 2 (DIC2/DNAI2) at the leading edge of migrating cells. DIC2 and IP6K3 are recruited interdependently to the leading edge, where they function coordinately to promote focal adhesion turnover and cell motility. Deletion of IP6K3 causes defects in cell motility and neuronal dendritic growth.\",\n      \"method\": \"Immunofluorescence microscopy, TIRF microscopy, co-immunoprecipitation, IP6K3 deletion cell lines\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus localization imaging plus KO phenotype, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"30718399\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CFAP70 interacts with both DNAI1 and DNAI2 in mouse testis (by co-immunoprecipitation). Loss of CFAP70 in Cfap70-deficient mice reduces AKAP3 levels in sperm flagella and leads to multiple morphological abnormalities of the flagella, implicating CFAP70 in flagellum assembly and transport of flagellar components including DNAI2.\",\n      \"method\": \"CRISPR/Cas9 knockout mouse, co-immunoprecipitation, immunofluorescence, Western blot\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP in KO mouse model with multiple orthogonal methods, single lab\",\n      \"pmids\": [\"37458246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A homozygous missense variant in DNAI2 (c.740G>A; p.Arg247Gln) causes PCD with complete absence of DNAI1, DNAI2, and DNAH5 from ciliary axonemes as shown by immunofluorescence, and TEM demonstrates absence of outer dynein arms, establishing that DNAI2 is required for proper ODA assembly in the ciliary axoneme.\",\n      \"method\": \"Whole exome sequencing, TEM, immunofluorescence analysis of patient nasal brushings\",\n      \"journal\": \"Frontiers in genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient-based functional study with TEM and immunofluorescence, single lab\",\n      \"pmids\": [\"36303540\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Pathogenic variants in CLXN (ODAD5) cause absence of DNAI2 (along with DNAH5 and DNAI1) from distal ciliary axonemes, placing CLXN upstream of or required for distal ODA assembly that includes DNAI2. Additionally, DNAI2 is absent from ciliary axonemes of individuals with defects in ODA-docking machinery components ODAD1-4, demonstrating that DNAI2 axonemal localization depends on the ODA-docking complex.\",\n      \"method\": \"Immunofluorescence microscopy on patient respiratory cells, TEM\",\n      \"journal\": \"Genetics in medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — immunofluorescence in multiple patient genotypes establishes pathway dependency, single lab\",\n      \"pmids\": [\"36727596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Mouse Dnai2 (Dnaic2) protein is approximately 70 kDa, encoded by an ~3 kb mRNA predominantly expressed in ovary, testis, and lung. In mouse ovaries, Dnai2 protein localizes to the surface of oocytes, with strong expression on secondary and antral follicle oocytes, suggesting a role in ovarian follicular development.\",\n      \"method\": \"Northern blot, Western blot, immunofluorescence localization in mouse ovary sections\",\n      \"journal\": \"DNA and cell biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — localization by immunofluorescence without functional consequence established, single lab, single study\",\n      \"pmids\": [\"18547164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CRISPR-Cas9 knockout of DNAI2 in primary nasal epithelial cultures creates a primary ciliary dyskinesia disease model, demonstrating that targeted loss of DNAI2 in human airway epithelial cells recapitulates PCD phenotype ex vivo.\",\n      \"method\": \"CRISPR-Cas9 genome editing in clonal nasal epithelial cultures\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, single method described briefly in abstract without detailed phenotypic characterization of DNAI2 KO specifically\",\n      \"pmids\": [\"bio_10.1101_2025.09.15.675861\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"DNAI2 is an outer dynein arm (ODA) intermediate chain that localizes throughout the ciliary axoneme and is required for assembly of both proximal and distal ODA complexes; its axonemal incorporation depends on an ODA-docking complex and a cytoplasmic pre-assembly pathway in which the R2TP-associated factor Pontin stabilizes DNAI1, which in turn stabilizes DNAI2, with HEATR2 and ZMYND10 also participating in this cytoplasmic pre-assembly cascade; additionally, DNAI2 (as DIC2) functions at the leading edge of migrating cells where it interacts with IP6K3 to promote focal adhesion turnover and cell motility.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DNAI2 is an outer dynein arm (ODA) intermediate chain that distributes throughout the ciliary axoneme and is required for assembly of both proximal and distal ODA complexes; loss-of-function mutations abolish DNAI2 from cilia and eliminate the ODA heavy chains DNAH5 and DNAH9 along the entire axoneme, distinguishing it from DNAI1, whose loss mainly affects proximal ODAs [#0, #9]. Its identity as a structural ODA component related to Chlamydomonas IC69, with expression concentrated in trachea and testis, was established by molecular cloning [#1]. Axonemal incorporation of DNAI2 depends on a cytoplasmic pre-assembly cascade in which the R2TP-associated AAA ATPase Pontin stabilizes the dynein intermediate chains [#5], and a hierarchical ZMYND10\\u2192DNAI1\\u2192DNAI2 stabilization pathway operates such that DNAI2 is stabilized by co-expression with DNAI1 and ZMYND10 rather than by direct ZMYND10 binding; HEATR2 and CFAP70 also participate in this cytoplasmic assembly and transport network through direct binding to DNAI2 [#4, #6, #8]. Beyond pre-assembly, axonemal docking of DNAI2 requires the ODA-docking complex, since defects in CLXN/ODAD5 and ODAD1-4 leave DNAI2 absent from the axoneme [#10]. In vertebrate models, Dnai2 is required for ODA formation in motile cilia, and its loss disrupts nodal flow to produce left-right axis defects and, with paralog loss, polycystic kidney disease [#2, #3]. Separately, DNAI2 (as DIC2) localizes to the leading edge of migrating cells, where it is recruited interdependently with IP6K3 to promote focal adhesion turnover and cell motility [#7].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Identifying the gene as a homolog of an ODA intermediate chain established DNAI2 as a candidate structural component of the ciliary dynein motor.\",\n      \"evidence\": \"cDNA cloning, chromosomal mapping, and Northern blot showing tracheal/testis expression and relatedness to Chlamydomonas IC69\",\n      \"pmids\": [\"11153919\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional demonstration of axonemal incorporation\", \"No in vivo loss-of-function phenotype\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Patient genetics defined DNAI2 as required for assembly of both proximal and distal ODA complexes, distinguishing its role from DNAI1.\",\n      \"evidence\": \"Immunofluorescence, EM, and Western blot in respiratory cells from patients with loss-of-function DNAI2 mutations across multiple families\",\n      \"pmids\": [\"18950741\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not resolve the molecular interaction map within the ODA\", \"Mechanism by which DNAI2 organizes heavy-chain assembly not defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Expression and oocyte-surface localization data raised a possible role beyond cilia, in ovarian follicular development.\",\n      \"evidence\": \"Northern/Western blot and immunofluorescence in mouse ovary sections\",\n      \"pmids\": [\"18547164\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Localization without a functional consequence established\", \"Single lab, single study\", \"No link to a motile-cilia mechanism demonstrated\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Vertebrate genetics connected Dnai2-dependent ODA assembly to ciliary motility, nodal flow, and left-right and kidney development.\",\n      \"evidence\": \"Positional cloning, EM ultrastructure, double-mutant epistasis, and live nodal-flow imaging in medaka\",\n      \"pmids\": [\"20707998\", \"20709053\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Paralog redundancy versus tissue-specific roles only partly resolved\", \"Does not address human pre-assembly factors\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identifying HEATR2 as a DNAI2 binding partner placed DNAI2 within a cytoplasmic dynein pre-assembly network distinct from generic HSP70/HSP90 chaperoning.\",\n      \"evidence\": \"Co-immunoprecipitation of HEATR2 with DNAI2 plus genetic analysis in Drosophila and PCD patients\",\n      \"pmids\": [\"25232951\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single Co-IP without reciprocal validation detailed\", \"Direct versus indirect binding not resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Pontin/R2TP was shown to stabilize DNAI2, defining an early co-chaperone-dependent step of dynein arm assembly.\",\n      \"evidence\": \"Pontin conditional knockout mouse testis with Western blot for DNAI2 levels and cytosolic puncta localization\",\n      \"pmids\": [\"29113992\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether Pontin acts directly on DNAI2 not established\", \"Single lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"A hierarchical ZMYND10\\u2192DNAI1\\u2192DNAI2 stabilization cascade was defined, showing DNAI2 stability is governed indirectly through DNAI1 rather than by direct ZMYND10 binding.\",\n      \"evidence\": \"Zmynd10 knockout mouse, reciprocal Co-IP, and co-expression stability assays with cilia EM\",\n      \"pmids\": [\"29601588\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and order of subunit incorporation not fully defined\", \"Structural basis of DNAI1-DNAI2 stabilization unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"A cilia-independent function emerged: DNAI2/DIC2 partners with IP6K3 at the leading edge to drive focal adhesion turnover and motility.\",\n      \"evidence\": \"Co-IP, immunofluorescence/TIRF imaging, and IP6K3 deletion cell lines\",\n      \"pmids\": [\"30718399\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of focal adhesion turnover by DIC2 unclear\", \"Relationship to canonical axonemal role not addressed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"An additional PCD-causing DNAI2 missense variant confirmed the requirement of DNAI2 for ODA assembly with co-loss of DNAI1 and DNAH5.\",\n      \"evidence\": \"Whole exome sequencing, TEM, and immunofluorescence of patient nasal brushings\",\n      \"pmids\": [\"36303540\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single family\", \"Effect of missense on protein folding/interaction not biochemically dissected\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Genetics of docking and flagellar factors placed DNAI2 axonemal localization downstream of the ODA-docking complex (CLXN/ODAD5, ODAD1-4) and the flagellar assembly factor CFAP70.\",\n      \"evidence\": \"Immunofluorescence/TEM in ODAD-mutant patient cells; CRISPR knockout mouse plus Co-IP for CFAP70-DNAI2\",\n      \"pmids\": [\"36727596\", \"37458246\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct docking interactions of DNAI2 not mapped\", \"Distal-specific docking mechanism incompletely defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"An ex vivo human airway model of DNAI2 loss was established to recapitulate the PCD phenotype.\",\n      \"evidence\": \"CRISPR-Cas9 knockout in clonal primary nasal epithelial cultures (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.09.15.675861\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Preprint without detailed DNAI2-specific phenotyping\", \"Mechanistic readouts beyond model establishment not reported\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the same intermediate chain is partitioned between an axonemal dynein-assembly role and a leading-edge motility/focal-adhesion role remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of DNAI2 within the ODA\", \"Direct binding partners within ODA not biochemically mapped\", \"Regulation distinguishing ciliary versus cytoplasmic pools unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 2, 9, 10]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4, 5]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 6, 10]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [\"outer dynein arm\"],\n    \"partners\": [\"DNAI1\", \"HEATR2\", \"ZMYND10\", \"RUVBL1\", \"CFAP70\", \"IP6K3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}