{"gene":"DNAAF5","run_date":"2026-04-28T17:46:02","timeline":{"discoveries":[{"year":2012,"finding":"HEATR2 (DNAAF5) was identified as a dynein axonemal assembly factor required for outer dynein arm (ODA) assembly in motile cilia. Loss-of-function in patients and model organisms resulted in absent dynein arms and loss of ciliary beating. Immunohistochemistry localized HEATR2 to the cytoplasm (not within cilia), indicating a role in cytoplasmic pre-assembly or transport of dynein arms rather than as a structural axonemal component. MicroRNA-mediated silencing of the Chlamydomonas ortholog and shRNA knockdown in human airway epithelial cells recapitulated absent ODAs and reduced flagellar beat frequency.","method":"Whole-exome sequencing of PCD patients, immunohistochemistry for subcellular localization, miRNA knockdown in Chlamydomonas reinhardtii, shRNA knockdown in human airway epithelial cells, transmission electron microscopy of axoneme ultrastructure, ciliary beat frequency measurement","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (genetic, cell-biological, model-organism) replicated across human and algal systems","pmids":["23040496"],"is_preprint":false},{"year":2023,"finding":"Allele-specific and tissue-specific requirements for DNAAF5 in dynein motor assembly were established using CRISPR-Cas9 mouse models recreating a human missense variant and a frameshift-null allele. Homozygous null Dnaaf5 was embryonic lethal; compound heterozygous (missense/null) animals showed severe hydrocephalus and early death; homozygous missense animals had partial cilia function and improved survival. Proteomic analysis of airway cilia from mutant mice revealed reductions in axonemal regulatory and structural proteins not previously linked to DNAAF5, and transcriptional analysis showed compensatory upregulation of axonemal protein-coding genes in mutant cells.","method":"CRISPR-Cas9 knock-in mouse models, ultrastructure analysis (electron microscopy), quantitative proteomics of isolated airway cilia, transcriptional (RNA) analysis of mouse and human mutant cells","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (genetics, ultrastructure, proteomics, transcriptomics) in a well-controlled in vivo model","pmids":["37104040"],"is_preprint":false},{"year":2022,"finding":"In hepatocellular carcinoma cells, DNAAF5 was found to act as a scaffold protein that directly binds PFKL (phosphofructokinase, liver type) and recruits the deubiquitinase USP39, forming a ternary complex. This interaction stabilizes PFKL protein by promoting its deubiquitination, thereby enhancing glycolytic activity and tumor cell proliferation. DNAAF5 knockout reduced proliferation and increased sorafenib sensitivity, and USP39 knockdown suppressed the proliferative effect of DNAAF5 overexpression in vitro and in vivo.","method":"Co-immunoprecipitation, mass spectrometry (transcriptome sequencing + proteomics), stable cell line overexpression/knockout, colony formation assay, xenograft in vivo model, tissue microarray","journal":"Frontiers in oncology","confidence":"Medium","confidence_rationale":"Tier 2/3 — Co-IP and functional rescue experiments in one lab; mechanistic model supported by multiple complementary approaches but not independently replicated","pmids":["36276075"],"is_preprint":false},{"year":2025,"finding":"Zebrafish dnaaf5 mRNA is expressed in motile ciliated tissues including Kupffer's vesicle, pronephros, floor plate, brain, and olfactory placode. CRISPR-based crispants for dnaaf5 developed ciliopathic defects, consistent with a conserved role in motile cilia biogenesis and function in vertebrates.","method":"Whole-mount in situ hybridization for spatio-temporal expression mapping, CRISPR crispant generation, phenotypic analysis of ciliopathic defects in zebrafish embryos","journal":"The International journal of developmental biology","confidence":"Medium","confidence_rationale":"Tier 3 — direct expression localization and crispant phenotype in zebrafish; single study, moderate mechanistic depth","pmids":["42029186"],"is_preprint":false}],"current_model":"DNAAF5 (HEATR2) is a cytoplasmic dynein axonemal assembly factor that acts as a scaffold for the pre-assembly of dynein arms before their transport into motile cilia, with allele-specific and tissue-specific requirements; loss of function causes absent dynein arms and primary ciliary dyskinesia, while in hepatocellular carcinoma cells it additionally functions as a scaffold recruiting USP39 to stabilize PFKL via deubiquitination."},"narrative":{"teleology":[{"year":2012,"claim":"The fundamental question of DNAAF5's cellular role was answered: it is a cytoplasmic factor required for outer dynein arm assembly in motile cilia, establishing that ciliary dynein arm biogenesis depends on dedicated cytoplasmic assembly factors beyond known axonemal structural components.","evidence":"Whole-exome sequencing of PCD patients, miRNA knockdown in Chlamydomonas, shRNA knockdown in human airway epithelia, immunohistochemistry, and TEM across human and algal systems","pmids":["23040496"],"confidence":"High","gaps":["Precise molecular mechanism of DNAAF5 in dynein pre-assembly (direct chaperone vs. scaffold vs. transport adaptor) was not resolved","Whether DNAAF5 also contributes to inner dynein arm assembly was not definitively tested","No structural information on DNAAF5 or its interaction partners in the dynein assembly pathway"]},{"year":2022,"claim":"A non-ciliary scaffolding function for DNAAF5 was identified in hepatocellular carcinoma, showing it recruits USP39 to deubiquitinate and stabilize PFKL, linking DNAAF5 to glycolytic regulation and tumor proliferation — a role mechanistically distinct from its ciliary assembly function.","evidence":"Co-immunoprecipitation, mass spectrometry, overexpression/knockout cell lines, colony formation assays, and xenograft models in hepatocellular carcinoma","pmids":["36276075"],"confidence":"Medium","gaps":["Single-lab study; DNAAF5–USP39–PFKL ternary complex not independently replicated","Whether the DNAAF5 scaffolding role for USP39 operates in non-cancerous tissues is unknown","Structural basis for DNAAF5 interaction with both USP39 and PFKL not determined"]},{"year":2023,"claim":"Allele-specific and tissue-specific requirements for DNAAF5 were established, revealing that complete loss is embryonic lethal while hypomorphic alleles produce graded ciliary dysfunction, and that DNAAF5 function extends to axonemal regulatory and structural proteins beyond dynein arms.","evidence":"CRISPR-Cas9 knock-in mouse models (null and missense alleles), quantitative proteomics of isolated airway cilia, transcriptomic profiling of mouse and human mutant cells","pmids":["37104040"],"confidence":"High","gaps":["Whether the broader proteomic changes reflect a direct DNAAF5 function in non-dynein assembly or are secondary to dynein loss is unresolved","Compensatory transcriptional upregulation mechanisms are not molecularly defined","Genotype–phenotype relationship for diverse human DNAAF5 alleles remains incompletely mapped"]},{"year":2025,"claim":"Conserved expression of dnaaf5 in motile ciliated tissues and ciliopathic phenotypes in zebrafish crispants confirmed that DNAAF5's role in motile cilia biogenesis is broadly conserved across vertebrates.","evidence":"Whole-mount in situ hybridization and CRISPR crispant phenotyping in zebrafish","pmids":["42029186"],"confidence":"Medium","gaps":["Zebrafish study is from a single lab; independent replication pending","Molecular interactors of dnaaf5 in zebrafish not identified","Relationship between zebrafish dnaaf5 crispant phenotypes and specific dynein arm subtypes not resolved"]},{"year":null,"claim":"The direct molecular mechanism by which DNAAF5 participates in dynein arm pre-assembly — whether as a chaperone, scaffold for a multi-protein assembly complex, or transport adaptor — remains undefined, and no structural model of DNAAF5 or its complexes exists.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal or cryo-EM structure of DNAAF5 alone or in complex","Identity of the full set of direct binding partners in the dynein assembly pathway is incomplete","Relationship between the ciliary assembly function and the oncogenic scaffolding function has not been investigated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,2]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,1,3]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[2]}],"complexes":[],"partners":["USP39","PFKL"],"other_free_text":[]},"mechanistic_narrative":"DNAAF5 (formerly HEATR2) is a cytoplasmic dynein axonemal assembly factor required for the pre-assembly and/or transport of dynein arms into motile cilia; its loss abolishes outer dynein arms and ciliary beating, causing primary ciliary dyskinesia [PMID:23040496]. CRISPR knock-in mouse models demonstrate allele-specific and tissue-specific requirements: null alleles are embryonic lethal, whereas hypomorphic missense alleles permit partial cilia function, and quantitative proteomics of mutant airway cilia reveal broader reductions in axonemal regulatory and structural proteins beyond dynein arms [PMID:37104040]. In hepatocellular carcinoma cells, DNAAF5 additionally functions as a scaffold that recruits the deubiquitinase USP39 to stabilize the glycolytic enzyme PFKL, promoting tumor cell proliferation and sorafenib resistance [PMID:36276075]."},"prefetch_data":{"uniprot":{"accession":"Q86Y56","full_name":"Dynein axonemal assembly factor 5","aliases":["HEAT repeat-containing protein 2"],"length_aa":855,"mass_kda":93.5,"function":"Cytoplasmic protein involved in the delivery of the dynein machinery to the motile cilium. It is required for the assembly of the axonemal dynein inner and outer arms, two structures attached to the peripheral outer doublet A microtubule of the axoneme, that play a crucial role in cilium motility","subcellular_location":"Cytoplasm; Dynein axonemal particle","url":"https://www.uniprot.org/uniprotkb/Q86Y56/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DNAAF5","classification":"Not Classified","n_dependent_lines":187,"n_total_lines":1208,"dependency_fraction":0.15480132450331127},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DNAAF5","total_profiled":1310},"omim":[{"mim_id":"614874","title":"CILIARY DYSKINESIA, PRIMARY, 18; CILD18","url":"https://www.omim.org/entry/614874"},{"mim_id":"614864","title":"DYNEIN, AXONEMAL, ASSEMBLY FACTOR 5; DNAAF5","url":"https://www.omim.org/entry/614864"},{"mim_id":"244400","title":"CILIARY DYSKINESIA, PRIMARY, 1; CILD1","url":"https://www.omim.org/entry/244400"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"},{"location":"Nucleoli","reliability":"Additional"},{"location":"Microtubules","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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allele-specific and tissue-specific reductions in axonemal regulatory and structural proteins, demonstrating a direct role in cilia dynein arm assembly.\",\n      \"method\": \"CRISPR-Cas9 mouse models (missense and frameshift-null alleles), ultrastructure analysis (TEM), proteomic analysis of isolated airway cilia, transcriptional analysis of mutant cells\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (in vivo CRISPR models, ultrastructure, proteomics, transcriptomics) in a single rigorous study\",\n      \"pmids\": [\"37104040\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DNAAF5 acts as a scaffold protein in hepatocellular carcinoma cells, directly binding PFKL and recruiting the deubiquitinase USP39 to form a ternary complex, thereby preventing PFKL ubiquitination and improving PFKL protein stability to enhance glycolysis.\",\n      \"method\": \"Co-IP, mass spectrometry, transcriptome sequencing, DNAAF5 overexpression and knockout stable cell lines, in vivo xenograft, USP39 knockdown rescue experiments\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — multiple methods (Co-IP, MS, KO/OE, in vivo) from single lab; mechanistic claim supported by rescue experiment\",\n      \"pmids\": [\"36276075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"dnaaf5 mRNA is expressed in motile ciliated tissues (Kupffer's vesicle, pronephros, floor plate, brain, olfactory placode) in zebrafish embryos, and dnaaf5 crispants develop ciliopathic defects, establishing a functional role in motile cilia biogenesis and function during vertebrate development.\",\n      \"method\": \"In situ hybridization for spatio-temporal expression, CRISPR crispant zebrafish with ciliopathic phenotype readout\",\n      \"journal\": \"The International journal of developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — direct loss-of-function in zebrafish with defined ciliopathic phenotype, consistent with mammalian function\",\n      \"pmids\": [\"42029186\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DNAAF5 is a dynein axonemal assembly factor that localizes to motile ciliated tissues and is required for the proper assembly of dynein arms onto axonemes; loss of DNAAF5 reduces axonemal structural and regulatory proteins and abolishes cilia motility in an allele- and tissue-specific manner, while in non-ciliary contexts it has also been reported to act as a scaffold recruiting USP39 to stabilize PFKL via deubiquitination.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2012,\n      \"finding\": \"HEATR2 (DNAAF5) was identified as a dynein axonemal assembly factor required for outer dynein arm (ODA) assembly in motile cilia. Loss-of-function in patients and model organisms resulted in absent dynein arms and loss of ciliary beating. Immunohistochemistry localized HEATR2 to the cytoplasm (not within cilia), indicating a role in cytoplasmic pre-assembly or transport of dynein arms rather than as a structural axonemal component. MicroRNA-mediated silencing of the Chlamydomonas ortholog and shRNA knockdown in human airway epithelial cells recapitulated absent ODAs and reduced flagellar beat frequency.\",\n      \"method\": \"Whole-exome sequencing of PCD patients, immunohistochemistry for subcellular localization, miRNA knockdown in Chlamydomonas reinhardtii, shRNA knockdown in human airway epithelial cells, transmission electron microscopy of axoneme ultrastructure, ciliary beat frequency measurement\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (genetic, cell-biological, model-organism) replicated across human and algal systems\",\n      \"pmids\": [\"23040496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Allele-specific and tissue-specific requirements for DNAAF5 in dynein motor assembly were established using CRISPR-Cas9 mouse models recreating a human missense variant and a frameshift-null allele. Homozygous null Dnaaf5 was embryonic lethal; compound heterozygous (missense/null) animals showed severe hydrocephalus and early death; homozygous missense animals had partial cilia function and improved survival. Proteomic analysis of airway cilia from mutant mice revealed reductions in axonemal regulatory and structural proteins not previously linked to DNAAF5, and transcriptional analysis showed compensatory upregulation of axonemal protein-coding genes in mutant cells.\",\n      \"method\": \"CRISPR-Cas9 knock-in mouse models, ultrastructure analysis (electron microscopy), quantitative proteomics of isolated airway cilia, transcriptional (RNA) analysis of mouse and human mutant cells\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (genetics, ultrastructure, proteomics, transcriptomics) in a well-controlled in vivo model\",\n      \"pmids\": [\"37104040\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In hepatocellular carcinoma cells, DNAAF5 was found to act as a scaffold protein that directly binds PFKL (phosphofructokinase, liver type) and recruits the deubiquitinase USP39, forming a ternary complex. This interaction stabilizes PFKL protein by promoting its deubiquitination, thereby enhancing glycolytic activity and tumor cell proliferation. DNAAF5 knockout reduced proliferation and increased sorafenib sensitivity, and USP39 knockdown suppressed the proliferative effect of DNAAF5 overexpression in vitro and in vivo.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry (transcriptome sequencing + proteomics), stable cell line overexpression/knockout, colony formation assay, xenograft in vivo model, tissue microarray\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — Co-IP and functional rescue experiments in one lab; mechanistic model supported by multiple complementary approaches but not independently replicated\",\n      \"pmids\": [\"36276075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Zebrafish dnaaf5 mRNA is expressed in motile ciliated tissues including Kupffer's vesicle, pronephros, floor plate, brain, and olfactory placode. CRISPR-based crispants for dnaaf5 developed ciliopathic defects, consistent with a conserved role in motile cilia biogenesis and function in vertebrates.\",\n      \"method\": \"Whole-mount in situ hybridization for spatio-temporal expression mapping, CRISPR crispant generation, phenotypic analysis of ciliopathic defects in zebrafish embryos\",\n      \"journal\": \"The International journal of developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — direct expression localization and crispant phenotype in zebrafish; single study, moderate mechanistic depth\",\n      \"pmids\": [\"42029186\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DNAAF5 (HEATR2) is a cytoplasmic dynein axonemal assembly factor that acts as a scaffold for the pre-assembly of dynein arms before their transport into motile cilia, with allele-specific and tissue-specific requirements; loss of function causes absent dynein arms and primary ciliary dyskinesia, while in hepatocellular carcinoma cells it additionally functions as a scaffold recruiting USP39 to stabilize PFKL via deubiquitination.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"DNAAF5 is a dynein axonemal assembly factor essential for the proper assembly of dynein arms onto motile cilia axonemes; null homozygosity in mice is embryonic lethal, while hypomorphic missense variants cause allele- and tissue-specific reductions in axonemal regulatory and structural proteins with consequent loss of cilia motility [PMID:37104040]. Conserved expression in motile ciliated tissues is confirmed in zebrafish, where dnaaf5 loss produces ciliopathic developmental defects including laterality and kidney abnormalities [PMID:42029186]. In a non-ciliary context, DNAAF5 functions as a scaffold that directly binds PFKL and recruits the deubiquitinase USP39 to stabilize PFKL protein and promote glycolysis in hepatocellular carcinoma cells [PMID:36276075].\",\n  \"teleology\": [\n    {\n      \"year\": 2022,\n      \"claim\": \"Whether DNAAF5 had functions outside cilia was unknown; demonstration that it scaffolds a USP39–PFKL deubiquitination complex in hepatocellular carcinoma cells established a non-ciliary role in glycolytic enzyme stabilization.\",\n      \"evidence\": \"Co-IP, mass spectrometry, DNAAF5 KO/OE cell lines, USP39 knockdown rescue, and xenograft assays in HCC models\",\n      \"pmids\": [\"36276075\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-lab finding; independent replication of the ternary complex is lacking\",\n        \"Whether the PFKL-stabilizing function operates outside cancer cell lines is untested\",\n        \"Structural basis of DNAAF5 scaffolding activity is undefined\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"The central question of how DNAAF5 contributes to motile cilia assembly was resolved: it is required for dynein arm loading onto axonemes, with complete loss being embryonic lethal and hypomorphic alleles producing graded, tissue-specific defects in axonemal regulatory and structural protein composition.\",\n      \"evidence\": \"CRISPR-Cas9 mouse models (null and missense alleles), TEM ultrastructure, cilia proteomics, and transcriptomics of mutant airway cells\",\n      \"pmids\": [\"37104040\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct biochemical interaction partners in the dynein preassembly pathway are not identified\",\n        \"Mechanism of allele- and tissue-specificity is not explained at the molecular level\",\n        \"Relationship between the ciliary assembly role and the reported PFKL-stabilizing role is unaddressed\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Conservation of DNAAF5 function in a second vertebrate model was established: zebrafish dnaaf5 is expressed specifically in motile ciliated tissues and its disruption phenocopies ciliopathies, confirming an evolutionarily conserved role in motile cilia biogenesis.\",\n      \"evidence\": \"In situ hybridization and CRISPR crispant analysis in zebrafish embryos\",\n      \"pmids\": [\"42029186\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Ultrastructural and proteomic characterization of zebrafish dnaaf5 mutant cilia has not been performed\",\n        \"Whether zebrafish dnaaf5 loss specifically affects dynein arm assembly (as in mouse) versus broader ciliary defects is unresolved\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The direct protein clients and chaperone co-factors through which DNAAF5 promotes dynein arm preassembly remain unidentified, and whether its ciliary and non-ciliary (PFKL-scaffolding) functions reflect a unified molecular activity or context-dependent moonlighting is unknown.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No dynein preassembly complex partners for DNAAF5 have been biochemically defined\",\n        \"No structural model of DNAAF5 exists\",\n        \"Human genetic evidence linking DNAAF5 variants to primary ciliary dyskinesia has not been reported in this timeline\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"USP39\",\n      \"PFKL\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"DNAAF5 (formerly HEATR2) is a cytoplasmic dynein axonemal assembly factor required for the pre-assembly and/or transport of dynein arms into motile cilia; its loss abolishes outer dynein arms and ciliary beating, causing primary ciliary dyskinesia [PMID:23040496]. CRISPR knock-in mouse models demonstrate allele-specific and tissue-specific requirements: null alleles are embryonic lethal, whereas hypomorphic missense alleles permit partial cilia function, and quantitative proteomics of mutant airway cilia reveal broader reductions in axonemal regulatory and structural proteins beyond dynein arms [PMID:37104040]. In hepatocellular carcinoma cells, DNAAF5 additionally functions as a scaffold that recruits the deubiquitinase USP39 to stabilize the glycolytic enzyme PFKL, promoting tumor cell proliferation and sorafenib resistance [PMID:36276075].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"The fundamental question of DNAAF5's cellular role was answered: it is a cytoplasmic factor required for outer dynein arm assembly in motile cilia, establishing that ciliary dynein arm biogenesis depends on dedicated cytoplasmic assembly factors beyond known axonemal structural components.\",\n      \"evidence\": \"Whole-exome sequencing of PCD patients, miRNA knockdown in Chlamydomonas, shRNA knockdown in human airway epithelia, immunohistochemistry, and TEM across human and algal systems\",\n      \"pmids\": [\"23040496\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Precise molecular mechanism of DNAAF5 in dynein pre-assembly (direct chaperone vs. scaffold vs. transport adaptor) was not resolved\",\n        \"Whether DNAAF5 also contributes to inner dynein arm assembly was not definitively tested\",\n        \"No structural information on DNAAF5 or its interaction partners in the dynein assembly pathway\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"A non-ciliary scaffolding function for DNAAF5 was identified in hepatocellular carcinoma, showing it recruits USP39 to deubiquitinate and stabilize PFKL, linking DNAAF5 to glycolytic regulation and tumor proliferation — a role mechanistically distinct from its ciliary assembly function.\",\n      \"evidence\": \"Co-immunoprecipitation, mass spectrometry, overexpression/knockout cell lines, colony formation assays, and xenograft models in hepatocellular carcinoma\",\n      \"pmids\": [\"36276075\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-lab study; DNAAF5–USP39–PFKL ternary complex not independently replicated\",\n        \"Whether the DNAAF5 scaffolding role for USP39 operates in non-cancerous tissues is unknown\",\n        \"Structural basis for DNAAF5 interaction with both USP39 and PFKL not determined\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Allele-specific and tissue-specific requirements for DNAAF5 were established, revealing that complete loss is embryonic lethal while hypomorphic alleles produce graded ciliary dysfunction, and that DNAAF5 function extends to axonemal regulatory and structural proteins beyond dynein arms.\",\n      \"evidence\": \"CRISPR-Cas9 knock-in mouse models (null and missense alleles), quantitative proteomics of isolated airway cilia, transcriptomic profiling of mouse and human mutant cells\",\n      \"pmids\": [\"37104040\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether the broader proteomic changes reflect a direct DNAAF5 function in non-dynein assembly or are secondary to dynein loss is unresolved\",\n        \"Compensatory transcriptional upregulation mechanisms are not molecularly defined\",\n        \"Genotype–phenotype relationship for diverse human DNAAF5 alleles remains incompletely mapped\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Conserved expression of dnaaf5 in motile ciliated tissues and ciliopathic phenotypes in zebrafish crispants confirmed that DNAAF5's role in motile cilia biogenesis is broadly conserved across vertebrates.\",\n      \"evidence\": \"Whole-mount in situ hybridization and CRISPR crispant phenotyping in zebrafish\",\n      \"pmids\": [\"42029186\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Zebrafish study is from a single lab; independent replication pending\",\n        \"Molecular interactors of dnaaf5 in zebrafish not identified\",\n        \"Relationship between zebrafish dnaaf5 crispant phenotypes and specific dynein arm subtypes not resolved\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The direct molecular mechanism by which DNAAF5 participates in dynein arm pre-assembly — whether as a chaperone, scaffold for a multi-protein assembly complex, or transport adaptor — remains undefined, and no structural model of DNAAF5 or its complexes exists.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No crystal or cryo-EM structure of DNAAF5 alone or in complex\",\n        \"Identity of the full set of direct binding partners in the dynein assembly pathway is incomplete\",\n        \"Relationship between the ciliary assembly function and the oncogenic scaffolding function has not been investigated\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 1, 3]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"USP39\",\n      \"PFKL\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}