{"gene":"DNAAF6","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2014,"finding":"Pih1d3 (DNAAF6) localizes to the cytoplasm of spermatogenic cells (not in spermatids or mature sperm) and is required for cytoplasmic preassembly of axonemal dynein complexes; loss results in absence of outer dynein arms (ODAs) and inner dynein arms (IDAs) from sperm flagella axonemes and reduced levels of ODA/IDA proteins in testis.","method":"Knockout mouse model with immunofluorescence/fractionation localization, electron microscopy of axonemes, western blot of dynein protein levels, and co-immunoprecipitation showing interaction with ODA intermediate chain, Hsp70, and Hsp90","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined cellular phenotype, direct localization experiment, reciprocal Co-IP with multiple partners, replicated in subsequent studies","pmids":["24421334"],"is_preprint":false},{"year":2016,"finding":"PIH1D3 (DNAAF6) is involved in preassembly of both outer (ODA) and inner (IDA) dynein arms of cilia and sperm flagella; loss-of-function mutations lead to absent ODAs and reduced-to-absent IDAs causing ciliary and flagellar immotility. PIH1D3 physically interacts and co-precipitates with cytoplasmic ODA/IDA assembly factors DNAAF2 and DNAAF4.","method":"Patient loss-of-function mutations (frameshift/stop), transmission electron microscopy of cilia ultrastructure, co-immunoprecipitation of PIH1D3 with DNAAF2 and DNAAF4","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP with two partners, TEM ultrastructural phenotype, replicated across multiple patients and confirmed in independent studies","pmids":["28041644"],"is_preprint":false},{"year":2017,"finding":"Large genomic deletions and point mutations in PIH1D3 (DNAAF6) disrupt early axonemal dynein assembly causing X-linked PCD; PIH1D3 is proposed to be part of a complementary R2TP-like HSP90 co-chaperone complex (analogous to the DNAAF2-DNAAF4-HSP90 complex) affecting assembly of a subset of inner arm dyneins.","method":"Genomic deletion mapping, Sanger sequencing of point mutations, immunofluorescence of dynein arm markers in patient cilia, functional ciliary analysis","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient mutations with ciliary phenotype and immunofluorescence, R2TP-like complex membership proposed but not fully reconstituted in this study; single lab","pmids":["28176794"],"is_preprint":false},{"year":2022,"finding":"Drosophila Dnaaf6 (CG5048, orthologue of human DNAAF6) and Dnaaf4 form an R2TP-like co-chaperone complex required for axonemal dynein assembly; both proteins are specifically expressed in chordotonal neurons and sperm, and their loss impairs outer dynein arm (ODA) and a subset of inner dynein arm (IDA) assembly. Despite Drosophila Dnaaf4 lacking the TPR domain (needed in humans to recruit HSP90), the complex retains a conserved dynein assembly role.","method":"Drosophila genetic knockout, behavioral/physiological assays of chordotonal function, electron microscopy of sperm axonemes, protein co-association/mass spectrometry evidence for complex formation","journal":"Frontiers in genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with defined phenotype, molecular evidence for complex, single lab with orthogonal methods","pmids":["35873488"],"is_preprint":false},{"year":2020,"finding":"Novel hemizygous loss-of-function variants in DNAAF6 (PIH1D3) cause protein degradation and result in absence of outer and inner dynein arms in sperm flagella; both a frameshift variant (p.R107fs) and a missense variant (p.G97V) were shown to lead to DNAAF6 protein degradation when expressed in HEK293T cells.","method":"Whole-exome sequencing, Sanger confirmation, transmission electron microscopy of patient sperm, immunostaining, HEK293T cell expression assay demonstrating protein degradation","journal":"Journal of assisted reproduction and genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — TEM ultrastructural analysis plus cell-based protein stability assay, two variants tested, single lab","pmids":["32170493"],"is_preprint":false},{"year":2023,"finding":"PIH1D3 (DNAAF6) interacts with proteins required for pre-assembly and uploading of outer and inner dynein arms (ODA and IDA) in motile cilia; PIH1D3-knockout rats develop communicating hydrocephalus, situs inversus, defective mucociliary clearance, and spermatocyte survival defects, with dysfunctional dynein arm structure in cilia.","method":"TALEN-mediated knockout rat model, behavioral/pathological phenotyping, biochemical co-immunoprecipitation identifying dynein arm assembly protein partners, histological and electron microscopy analyses","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO rat with comprehensive phenotyping and Co-IP for novel protein interactions, single lab","pmids":["37900281"],"is_preprint":false},{"year":2024,"finding":"DNAAF6 interacts with LARP6 (La ribonucleoprotein 6) and co-localizes in biomolecular condensates called dynein axonemal particles in multiciliated cells (MCCs) of Xenopus embryos; this interaction is required for high α-tubulin protein expression near the apical side of MCCs during ciliogenesis. A DNAAF6 mutant that abolishes LARP6 binding fails to restore apical α-tubulin expression, and LARP6 was found to regulate tubulin alpha 1c-like mRNA.","method":"Xenopus embryo morphant rescue experiments, co-immunoprecipitation/co-localization in biomolecular condensates, domain mutant analysis, immunofluorescence for α-tubulin levels","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — morphant rescue with domain mutant, co-localization in condensates, and protein level readout; single lab, Xenopus model","pmids":["38762183"],"is_preprint":false},{"year":2024,"finding":"Skewed X-chromosome inactivation (XCI) in heterozygous DNAAF6 carrier mothers determines the proportion of airway motile cilia lacking dynein arms and drives variable expressivity of PCD symptoms; approximately one-third (20–50%) of normal ciliated airway cells is sufficient to avoid severe PCD.","method":"DNA-methylation XCI assay in carrier mothers, immunofluorescence and high-speed videomicroscopy of airway cilia, correlation of XCI pattern with ciliary phenotype and clinical phenotype in 6 families","journal":"Journal of medical genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct cellular phenotype correlated with XCI pattern using orthogonal methods (IF, videomicroscopy, methylation assay), multiple families, single lab","pmids":["38408845"],"is_preprint":false},{"year":2025,"finding":"A novel hemizygous intronic DNAAF6 variant (c.515+3_515+6del) causes exon 6 skipping and frameshift, demonstrated by minigene splicing assay; TEM of patient sperm showed absent outer and inner dynein arms and flagellar immotility.","method":"Whole-exome sequencing, Sanger sequencing, minigene splicing assay, transmission electron microscopy of sperm flagella","journal":"Frontiers in genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional minigene validation of splice effect plus TEM ultrastructural phenotype, single family/lab","pmids":["41480157"],"is_preprint":false}],"current_model":"DNAAF6 (PIH1D3) is a cytoplasmic PIH1-domain-containing protein that functions as part of an R2TP-like HSP90 co-chaperone complex (together with DNAAF2 and DNAAF4) to pre-assemble and stabilize both outer and inner axonemal dynein arm complexes before their import into cilia and flagella; it also interacts with LARP6 in biomolecular condensates to support α-tubulin expression during multiciliated cell ciliogenesis, and loss of DNAAF6 results in absent dynein arms, immotile cilia/flagella, and the full spectrum of primary ciliary dyskinesia features including situs inversus, male infertility, bronchiectasis, and hydrocephalus."},"narrative":{"mechanistic_narrative":"DNAAF6 (PIH1D3) is a cytoplasmic PIH-domain co-chaperone that drives the cytoplasmic preassembly of axonemal dynein complexes destined for cilia and sperm flagella [PMID:24421334]. It operates within an R2TP-like HSP90 co-chaperone module, physically associating with the dynein-assembly factors DNAAF2 and DNAAF4 to build both outer (ODA) and inner (IDA) dynein arms before their import into the axoneme [PMID:28041644, PMID:28176794]. Consistent with this preassembly role, loss of DNAAF6 abolishes ODAs and reduces or eliminates IDAs, yielding immotile cilia and flagella [PMID:24421334, PMID:28041644]; this requirement is conserved through Drosophila, where Dnaaf6 and Dnaaf4 form an analogous dynein-assembly complex [PMID:35873488]. Beyond dynein chaperoning, DNAAF6 interacts with LARP6 and co-localizes in biomolecular condensates (dynein axonemal particles) in multiciliated cells, where this interaction is required for high apical α-tubulin expression during ciliogenesis [PMID:38762183]. Loss-of-function mutations cause X-linked primary ciliary dyskinesia, with the spectrum of situs inversus, hydrocephalus, defective mucociliary clearance, and male infertility documented across patient cohorts and knockout rodent models [PMID:28176794, PMID:32170493, PMID:37900281]; in heterozygous female carriers, skewed X-inactivation governs the fraction of dynein-deficient cilia and thereby the variable expressivity of disease [PMID:38408845].","teleology":[{"year":2014,"claim":"Established that DNAAF6 is a cytoplasmic factor required for preassembly of axonemal dynein arms rather than an axonemal structural component, answering where and when it acts in dynein biogenesis.","evidence":"Knockout mouse with cytoplasmic localization imaging, axoneme EM showing absent ODA/IDA, and Co-IP with ODA intermediate chain, Hsp70, and Hsp90","pmids":["24421334"],"confidence":"High","gaps":["Did not define the specific dynein subunits stabilized at the molecular level","Stoichiometry and architecture of the chaperone complex not resolved"]},{"year":2016,"claim":"Connected DNAAF6 to human disease and placed it in a defined cytoplasmic assembly module by showing physical association with DNAAF2 and DNAAF4.","evidence":"Patient loss-of-function mutations, TEM of cilia ultrastructure, and reciprocal Co-IP with DNAAF2 and DNAAF4","pmids":["28041644"],"confidence":"High","gaps":["Direct demonstration of an assembled ternary complex not provided","Mechanism by which IDA subsets are differentially affected unresolved"]},{"year":2017,"claim":"Defined the X-linked genetic basis of DNAAF6-associated PCD and proposed its function within an R2TP-like HSP90 co-chaperone complex affecting a subset of inner-arm dyneins.","evidence":"Genomic deletion mapping, point-mutation sequencing, and immunofluorescence of dynein markers in patient cilia","pmids":["28176794"],"confidence":"Medium","gaps":["R2TP-like complex membership proposed but not reconstituted","Which IDA species require DNAAF6 versus the parallel DNAAF2/DNAAF4 pathway not delineated"]},{"year":2020,"claim":"Clarified the molecular consequence of pathogenic alleles by showing missense and frameshift variants destabilize the DNAAF6 protein.","evidence":"HEK293T expression assay demonstrating protein degradation, plus TEM of patient sperm and immunostaining","pmids":["32170493"],"confidence":"Medium","gaps":["Degradation pathway and turnover mechanism not identified","Single-lab assay; only two variants tested"]},{"year":2022,"claim":"Demonstrated evolutionary conservation of the DNAAF6-DNAAF4 dynein-assembly complex, showing the function is retained even where the TPR/HSP90-recruitment domain is absent.","evidence":"Drosophila genetic knockout with chordotonal and sperm phenotyping, sperm axoneme EM, and complex co-association by mass spectrometry","pmids":["35873488"],"confidence":"Medium","gaps":["How HSP90 is engaged without a TPR domain in Drosophila unexplained","Whether the fly complex assembles the same dynein subsets as in mammals untested"]},{"year":2023,"claim":"Confirmed the dynein preassembly and uploading role in an independent mammalian model and broadened the in-vivo phenotype to hydrocephalus, situs inversus, and spermatocyte defects.","evidence":"TALEN knockout rat with pathological phenotyping, Co-IP identifying dynein-arm assembly partners, and EM analysis","pmids":["37900281"],"confidence":"Medium","gaps":["Novel interacting partners not individually validated reciprocally","Mechanism linking dynein loss to communicating hydrocephalus not dissected"]},{"year":2024,"claim":"Revealed a chaperone-independent function: DNAAF6 partners with LARP6 in axonemal condensates to support apical α-tubulin expression during multiciliated-cell ciliogenesis.","evidence":"Xenopus morphant rescue with a LARP6-binding-deficient mutant, condensate co-localization, and α-tubulin immunofluorescence readout","pmids":["38762183"],"confidence":"Medium","gaps":["Mechanism by which the condensate elevates α-tubulin translation unresolved","Whether this role operates in mammalian cilia not tested"]},{"year":2024,"claim":"Explained variable expressivity in female carriers by linking skewed X-inactivation to the proportion of dynein-deficient airway cilia.","evidence":"DNA-methylation XCI assay, airway cilia immunofluorescence and high-speed videomicroscopy across 6 families","pmids":["38408845"],"confidence":"Medium","gaps":["Threshold of functional cilia derived from correlation, not mechanistic intervention","Tissue-specific XCI variation across organs not assessed"]},{"year":2025,"claim":"Extended the pathogenic mutation spectrum to a splice-disrupting intronic variant causing exon skipping and dynein-arm loss.","evidence":"Minigene splicing assay confirming exon 6 skipping plus TEM of patient sperm flagella","pmids":["41480157"],"confidence":"Medium","gaps":["Single family; functional rescue not performed","Residual transcript/protein levels not quantified"]},{"year":null,"claim":"How DNAAF6 selects and stabilizes specific dynein arm subunits, and how its R2TP-like chaperone activity is mechanistically coordinated with the LARP6-condensate tubulin pathway, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No reconstituted R2TP-like complex with defined stoichiometry","Substrate specificity for distinct ODA/IDA subtypes uncharacterized","No structural model of DNAAF6 in either chaperone or condensate context"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[0,1,2]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[1,5]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[1,6]}],"complexes":["R2TP-like HSP90 co-chaperone complex"],"partners":["DNAAF2","DNAAF4","HSP90","HSP70","LARP6"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9NQM4","full_name":"Dynein axonemal assembly factor 6","aliases":["PIH1 domain-containing protein 3","Sarcoma antigen NY-SAR-97"],"length_aa":214,"mass_kda":24.1,"function":"Plays a role in cytoplasmic pre-assembly of axonemal dynein","subcellular_location":"Cytoplasm; Golgi apparatus, trans-Golgi network","url":"https://www.uniprot.org/uniprotkb/Q9NQM4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DNAAF6","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DNAAF6","total_profiled":1310},"omim":[{"mim_id":"300991","title":"CILIARY DYSKINESIA, PRIMARY, 36, X-LINKED; CILD36","url":"https://www.omim.org/entry/300991"},{"mim_id":"300933","title":"DYNEIN, AXONEMAL, ASSEMBLY FACTOR 6; DNAAF6","url":"https://www.omim.org/entry/300933"},{"mim_id":"244400","title":"CILIARY DYSKINESIA, PRIMARY, 1; CILD1","url":"https://www.omim.org/entry/244400"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Golgi apparatus","reliability":"Approved"},{"location":"Primary cilium","reliability":"Approved"},{"location":"Acrosome","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"},{"location":"Primary cilium tip","reliability":"Additional"},{"location":"Basal body","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"},{"location":"Equatorial segment","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"choroid plexus","ntpm":3.8},{"tissue":"fallopian tube","ntpm":10.2},{"tissue":"testis","ntpm":11.1}],"url":"https://www.proteinatlas.org/search/DNAAF6"},"hgnc":{"alias_symbol":["MGC35261","NYSAR97","TWISTER"],"prev_symbol":["CXorf41","PIH1D3"]},"alphafold":{"accession":"Q9NQM4","domains":[{"cath_id":"2.60.40.790","chopping":"113-212","consensus_level":"high","plddt":87.0452,"start":113,"end":212}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NQM4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NQM4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NQM4-F1-predicted_aligned_error_v6.png","plddt_mean":73.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DNAAF6","jax_strain_url":"https://www.jax.org/strain/search?query=DNAAF6"},"sequence":{"accession":"Q9NQM4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NQM4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NQM4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NQM4"}},"corpus_meta":[{"pmid":"23704092","id":"PMC_23704092","title":"Safety 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2014,\n      \"finding\": \"Pih1d3 (DNAAF6) localizes to the cytoplasm of spermatogenic cells (not in spermatids or mature sperm) and is required for cytoplasmic preassembly of axonemal dynein complexes; loss results in absence of outer dynein arms (ODAs) and inner dynein arms (IDAs) from sperm flagella axonemes and reduced levels of ODA/IDA proteins in testis.\",\n      \"method\": \"Knockout mouse model with immunofluorescence/fractionation localization, electron microscopy of axonemes, western blot of dynein protein levels, and co-immunoprecipitation showing interaction with ODA intermediate chain, Hsp70, and Hsp90\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined cellular phenotype, direct localization experiment, reciprocal Co-IP with multiple partners, replicated in subsequent studies\",\n      \"pmids\": [\"24421334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PIH1D3 (DNAAF6) is involved in preassembly of both outer (ODA) and inner (IDA) dynein arms of cilia and sperm flagella; loss-of-function mutations lead to absent ODAs and reduced-to-absent IDAs causing ciliary and flagellar immotility. PIH1D3 physically interacts and co-precipitates with cytoplasmic ODA/IDA assembly factors DNAAF2 and DNAAF4.\",\n      \"method\": \"Patient loss-of-function mutations (frameshift/stop), transmission electron microscopy of cilia ultrastructure, co-immunoprecipitation of PIH1D3 with DNAAF2 and DNAAF4\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP with two partners, TEM ultrastructural phenotype, replicated across multiple patients and confirmed in independent studies\",\n      \"pmids\": [\"28041644\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Large genomic deletions and point mutations in PIH1D3 (DNAAF6) disrupt early axonemal dynein assembly causing X-linked PCD; PIH1D3 is proposed to be part of a complementary R2TP-like HSP90 co-chaperone complex (analogous to the DNAAF2-DNAAF4-HSP90 complex) affecting assembly of a subset of inner arm dyneins.\",\n      \"method\": \"Genomic deletion mapping, Sanger sequencing of point mutations, immunofluorescence of dynein arm markers in patient cilia, functional ciliary analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient mutations with ciliary phenotype and immunofluorescence, R2TP-like complex membership proposed but not fully reconstituted in this study; single lab\",\n      \"pmids\": [\"28176794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Drosophila Dnaaf6 (CG5048, orthologue of human DNAAF6) and Dnaaf4 form an R2TP-like co-chaperone complex required for axonemal dynein assembly; both proteins are specifically expressed in chordotonal neurons and sperm, and their loss impairs outer dynein arm (ODA) and a subset of inner dynein arm (IDA) assembly. Despite Drosophila Dnaaf4 lacking the TPR domain (needed in humans to recruit HSP90), the complex retains a conserved dynein assembly role.\",\n      \"method\": \"Drosophila genetic knockout, behavioral/physiological assays of chordotonal function, electron microscopy of sperm axonemes, protein co-association/mass spectrometry evidence for complex formation\",\n      \"journal\": \"Frontiers in genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with defined phenotype, molecular evidence for complex, single lab with orthogonal methods\",\n      \"pmids\": [\"35873488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Novel hemizygous loss-of-function variants in DNAAF6 (PIH1D3) cause protein degradation and result in absence of outer and inner dynein arms in sperm flagella; both a frameshift variant (p.R107fs) and a missense variant (p.G97V) were shown to lead to DNAAF6 protein degradation when expressed in HEK293T cells.\",\n      \"method\": \"Whole-exome sequencing, Sanger confirmation, transmission electron microscopy of patient sperm, immunostaining, HEK293T cell expression assay demonstrating protein degradation\",\n      \"journal\": \"Journal of assisted reproduction and genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — TEM ultrastructural analysis plus cell-based protein stability assay, two variants tested, single lab\",\n      \"pmids\": [\"32170493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PIH1D3 (DNAAF6) interacts with proteins required for pre-assembly and uploading of outer and inner dynein arms (ODA and IDA) in motile cilia; PIH1D3-knockout rats develop communicating hydrocephalus, situs inversus, defective mucociliary clearance, and spermatocyte survival defects, with dysfunctional dynein arm structure in cilia.\",\n      \"method\": \"TALEN-mediated knockout rat model, behavioral/pathological phenotyping, biochemical co-immunoprecipitation identifying dynein arm assembly protein partners, histological and electron microscopy analyses\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO rat with comprehensive phenotyping and Co-IP for novel protein interactions, single lab\",\n      \"pmids\": [\"37900281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DNAAF6 interacts with LARP6 (La ribonucleoprotein 6) and co-localizes in biomolecular condensates called dynein axonemal particles in multiciliated cells (MCCs) of Xenopus embryos; this interaction is required for high α-tubulin protein expression near the apical side of MCCs during ciliogenesis. A DNAAF6 mutant that abolishes LARP6 binding fails to restore apical α-tubulin expression, and LARP6 was found to regulate tubulin alpha 1c-like mRNA.\",\n      \"method\": \"Xenopus embryo morphant rescue experiments, co-immunoprecipitation/co-localization in biomolecular condensates, domain mutant analysis, immunofluorescence for α-tubulin levels\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — morphant rescue with domain mutant, co-localization in condensates, and protein level readout; single lab, Xenopus model\",\n      \"pmids\": [\"38762183\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Skewed X-chromosome inactivation (XCI) in heterozygous DNAAF6 carrier mothers determines the proportion of airway motile cilia lacking dynein arms and drives variable expressivity of PCD symptoms; approximately one-third (20–50%) of normal ciliated airway cells is sufficient to avoid severe PCD.\",\n      \"method\": \"DNA-methylation XCI assay in carrier mothers, immunofluorescence and high-speed videomicroscopy of airway cilia, correlation of XCI pattern with ciliary phenotype and clinical phenotype in 6 families\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct cellular phenotype correlated with XCI pattern using orthogonal methods (IF, videomicroscopy, methylation assay), multiple families, single lab\",\n      \"pmids\": [\"38408845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"A novel hemizygous intronic DNAAF6 variant (c.515+3_515+6del) causes exon 6 skipping and frameshift, demonstrated by minigene splicing assay; TEM of patient sperm showed absent outer and inner dynein arms and flagellar immotility.\",\n      \"method\": \"Whole-exome sequencing, Sanger sequencing, minigene splicing assay, transmission electron microscopy of sperm flagella\",\n      \"journal\": \"Frontiers in genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional minigene validation of splice effect plus TEM ultrastructural phenotype, single family/lab\",\n      \"pmids\": [\"41480157\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DNAAF6 (PIH1D3) is a cytoplasmic PIH1-domain-containing protein that functions as part of an R2TP-like HSP90 co-chaperone complex (together with DNAAF2 and DNAAF4) to pre-assemble and stabilize both outer and inner axonemal dynein arm complexes before their import into cilia and flagella; it also interacts with LARP6 in biomolecular condensates to support α-tubulin expression during multiciliated cell ciliogenesis, and loss of DNAAF6 results in absent dynein arms, immotile cilia/flagella, and the full spectrum of primary ciliary dyskinesia features including situs inversus, male infertility, bronchiectasis, and hydrocephalus.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DNAAF6 (PIH1D3) is a cytoplasmic PIH-domain co-chaperone that drives the cytoplasmic preassembly of axonemal dynein complexes destined for cilia and sperm flagella [#0]. It operates within an R2TP-like HSP90 co-chaperone module, physically associating with the dynein-assembly factors DNAAF2 and DNAAF4 to build both outer (ODA) and inner (IDA) dynein arms before their import into the axoneme [#1, #2]. Consistent with this preassembly role, loss of DNAAF6 abolishes ODAs and reduces or eliminates IDAs, yielding immotile cilia and flagella [#0, #1]; this requirement is conserved through Drosophila, where Dnaaf6 and Dnaaf4 form an analogous dynein-assembly complex [#3]. Beyond dynein chaperoning, DNAAF6 interacts with LARP6 and co-localizes in biomolecular condensates (dynein axonemal particles) in multiciliated cells, where this interaction is required for high apical \\u03b1-tubulin expression during ciliogenesis [#6]. Loss-of-function mutations cause X-linked primary ciliary dyskinesia, with the spectrum of situs inversus, hydrocephalus, defective mucociliary clearance, and male infertility documented across patient cohorts and knockout rodent models [#2, #4, #5]; in heterozygous female carriers, skewed X-inactivation governs the fraction of dynein-deficient cilia and thereby the variable expressivity of disease [#7].\",\n  \"teleology\": [\n    {\n      \"year\": 2014,\n      \"claim\": \"Established that DNAAF6 is a cytoplasmic factor required for preassembly of axonemal dynein arms rather than an axonemal structural component, answering where and when it acts in dynein biogenesis.\",\n      \"evidence\": \"Knockout mouse with cytoplasmic localization imaging, axoneme EM showing absent ODA/IDA, and Co-IP with ODA intermediate chain, Hsp70, and Hsp90\",\n      \"pmids\": [\"24421334\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Did not define the specific dynein subunits stabilized at the molecular level\",\n        \"Stoichiometry and architecture of the chaperone complex not resolved\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Connected DNAAF6 to human disease and placed it in a defined cytoplasmic assembly module by showing physical association with DNAAF2 and DNAAF4.\",\n      \"evidence\": \"Patient loss-of-function mutations, TEM of cilia ultrastructure, and reciprocal Co-IP with DNAAF2 and DNAAF4\",\n      \"pmids\": [\"28041644\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct demonstration of an assembled ternary complex not provided\",\n        \"Mechanism by which IDA subsets are differentially affected unresolved\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined the X-linked genetic basis of DNAAF6-associated PCD and proposed its function within an R2TP-like HSP90 co-chaperone complex affecting a subset of inner-arm dyneins.\",\n      \"evidence\": \"Genomic deletion mapping, point-mutation sequencing, and immunofluorescence of dynein markers in patient cilia\",\n      \"pmids\": [\"28176794\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"R2TP-like complex membership proposed but not reconstituted\",\n        \"Which IDA species require DNAAF6 versus the parallel DNAAF2/DNAAF4 pathway not delineated\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Clarified the molecular consequence of pathogenic alleles by showing missense and frameshift variants destabilize the DNAAF6 protein.\",\n      \"evidence\": \"HEK293T expression assay demonstrating protein degradation, plus TEM of patient sperm and immunostaining\",\n      \"pmids\": [\"32170493\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Degradation pathway and turnover mechanism not identified\",\n        \"Single-lab assay; only two variants tested\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrated evolutionary conservation of the DNAAF6-DNAAF4 dynein-assembly complex, showing the function is retained even where the TPR/HSP90-recruitment domain is absent.\",\n      \"evidence\": \"Drosophila genetic knockout with chordotonal and sperm phenotyping, sperm axoneme EM, and complex co-association by mass spectrometry\",\n      \"pmids\": [\"35873488\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"How HSP90 is engaged without a TPR domain in Drosophila unexplained\",\n        \"Whether the fly complex assembles the same dynein subsets as in mammals untested\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Confirmed the dynein preassembly and uploading role in an independent mammalian model and broadened the in-vivo phenotype to hydrocephalus, situs inversus, and spermatocyte defects.\",\n      \"evidence\": \"TALEN knockout rat with pathological phenotyping, Co-IP identifying dynein-arm assembly partners, and EM analysis\",\n      \"pmids\": [\"37900281\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Novel interacting partners not individually validated reciprocally\",\n        \"Mechanism linking dynein loss to communicating hydrocephalus not dissected\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed a chaperone-independent function: DNAAF6 partners with LARP6 in axonemal condensates to support apical \\u03b1-tubulin expression during multiciliated-cell ciliogenesis.\",\n      \"evidence\": \"Xenopus morphant rescue with a LARP6-binding-deficient mutant, condensate co-localization, and \\u03b1-tubulin immunofluorescence readout\",\n      \"pmids\": [\"38762183\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which the condensate elevates \\u03b1-tubulin translation unresolved\",\n        \"Whether this role operates in mammalian cilia not tested\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Explained variable expressivity in female carriers by linking skewed X-inactivation to the proportion of dynein-deficient airway cilia.\",\n      \"evidence\": \"DNA-methylation XCI assay, airway cilia immunofluorescence and high-speed videomicroscopy across 6 families\",\n      \"pmids\": [\"38408845\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Threshold of functional cilia derived from correlation, not mechanistic intervention\",\n        \"Tissue-specific XCI variation across organs not assessed\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended the pathogenic mutation spectrum to a splice-disrupting intronic variant causing exon skipping and dynein-arm loss.\",\n      \"evidence\": \"Minigene splicing assay confirming exon 6 skipping plus TEM of patient sperm flagella\",\n      \"pmids\": [\"41480157\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single family; functional rescue not performed\",\n        \"Residual transcript/protein levels not quantified\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DNAAF6 selects and stabilizes specific dynein arm subunits, and how its R2TP-like chaperone activity is mechanistically coordinated with the LARP6-condensate tubulin pathway, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No reconstituted R2TP-like complex with defined stoichiometry\",\n        \"Substrate specificity for distinct ODA/IDA subtypes uncharacterized\",\n        \"No structural model of DNAAF6 in either chaperone or condensate context\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [1, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [1, 6]}\n    ],\n    \"complexes\": [\"R2TP-like HSP90 co-chaperone complex\"],\n    \"partners\": [\"DNAAF2\", \"DNAAF4\", \"HSP90\", \"HSP70\", \"LARP6\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":5,"faith_total":5,"faith_pct":100.0}}