{"gene":"IFT38","run_date":"2026-06-10T01:55:22","timeline":{"discoveries":[{"year":2016,"finding":"Cluap1/IFT38 is an integral component of the IFT-B peripheral subcomplex (not the core). Using the visible immunoprecipitation (VIP) assay, IFT38 was mapped to the peripheral subcomplex of the IFT-B complex composed of 10 core and 6 peripheral subunits. Ciliogenesis defects in Cluap1-deficient mouse embryonic fibroblasts were rescued by wild-type Cluap1 but not by a mutant lacking binding ability to other IFT-B components, establishing that IFT-B complex integration is required for Cluap1 function.","method":"Visible immunoprecipitation (VIP) assay for protein-protein interaction mapping; rescue of ciliogenesis defect in Cluap1-deficient MEFs with wild-type vs. binding-deficient mutant Cluap1","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal VIP assay interaction mapping combined with functional mutagenesis rescue in knockout cells; multiple orthogonal methods in one study","pmids":["26980730"],"is_preprint":false},{"year":2018,"finding":"IFT38 is part of an IFT-B-connecting tetramer (IFT38-IFT52-IFT57-IFT88) that directly interacts with heterotrimeric kinesin-II (KIF3A-KIF3B-KAP3), with KIF3B being the primary contributor to IFT-B binding. This interaction is required for ciliogenesis: KIF3B-knockout cells were rescued by wild-type KIF3B but not by a KIF3B mutant compromised in IFT-B binding.","method":"Visible immunoprecipitation (VIP) assay; rescue of ciliogenesis defect in KIF3B-knockout cells with wild-type vs. IFT-B-binding-deficient KIF3B mutant","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — VIP interaction mapping combined with mutagenesis-based rescue in knockout cells, multiple orthogonal methods in one study","pmids":["29903877"],"is_preprint":false},{"year":2019,"finding":"IFT38 (from the IFT-B complex) directly interacts with BBSome subunits BBS1, BBS2, and BBS9. This IFT-B–BBSome interaction is specifically required for the export of GPR161 from cilia upon Hedgehog signaling stimulation. IFT38-knockout cells expressing a mutant IFT38 lacking BBS1+BBS2+BBS9 binding had restored ciliogenesis but showed significant accumulation of GPR161 within cilia, similar to BBS1-knockout cells.","method":"Visible immunoprecipitation (VIP) assay for interaction identification; phenotypic analysis of IFT38-knockout cells expressing wild-type or binding-deficient IFT38 mutant; GPR161 ciliary localization assay","journal":"Biology open","confidence":"High","confidence_rationale":"Tier 2 / Strong — VIP assay interaction identification combined with separation-of-function mutagenesis rescue experiment with specific cellular readout","pmids":["31471295"],"is_preprint":false},{"year":2018,"finding":"The N-terminal β-propeller of IFT80 tethers IFT80 to the IFT-B complex via IFT38, as revealed by the 1.8 Å crystal structure of Chlamydomonas IFT80 combined with structural mapping.","method":"Crystal structure determination (1.8 Å resolution); structural mapping of IFT-B interactions","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — crystal structure with domain mapping to IFT38, but interaction with IFT38 is inferred from structural context rather than directly validated by mutagenesis of the IFT38 interface in this study","pmids":["29658880"],"is_preprint":false},{"year":2013,"finding":"Cluap1/IFT38 protein undergoes bidirectional intraflagellar transport along cilia, with similar localization and kinetics to IFT20 (an IFT-B complex component), establishing it as a bona fide IFT-B cargo that moves anterograde and retrograde within cilia.","method":"High-speed in vivo confocal imaging of tagged Cluap1 in Xenopus epidermis multiciliated cells; comparison of IFT kinetics with IFT20","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct live imaging of IFT movement with kinetic quantification, single lab but clear functional readout","pmids":["24970261"],"is_preprint":false},{"year":2013,"finding":"Cluap1/IFT38 is preferentially localized to the base and tip of cilia and is required for axoneme elongation (not basal body docking) during ciliogenesis. Knockout mice show that the basal body docks normally but the axoneme fails to grow, and Hedgehog signaling is impaired.","method":"Cluap1 knockout mouse generation; immunofluorescence localization; Patched1-lacZ reporter for Hedgehog signaling; crown cell-specific Cluap1 rescue experiment","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct KO phenotyping with subcellular localization, pathway reporter assay, and tissue-specific rescue experiment providing mechanistic specificity","pmids":["23742838"],"is_preprint":false},{"year":2012,"finding":"Mammalian Cluap1 localizes to primary cilia and is required for cilia formation; Cluap1 mutant mouse embryos lack cilia at E9.5 and exhibit repressed Sonic hedgehog signaling, placing Cluap1 upstream of Shh pathway activity in mammals.","method":"Cluap1 knockout mouse generation; immunofluorescence for cilia; qRT-PCR for Shh target genes; β-galactosidase reporter assay for Shh pathway activity","journal":"Cilia","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse model with direct ciliary localization, multiple orthogonal pathway readouts, independently confirms findings in other model organisms","pmids":["23351563"],"is_preprint":false},{"year":2016,"finding":"Hypomorphic mutations in CLUAP1 (identified in an LCA patient) reduce but do not abolish cilia function in zebrafish photoreceptors, resulting in photoreceptor cell death. Rescue experiments in cluap1-knockout zebrafish confirmed the hypomorphic nature of the patient mutation, functionally linking CLUAP1 to photoreceptor ciliary maintenance.","method":"Whole-exome sequencing; cluap1 knockout zebrafish; mRNA rescue experiments; immunohistochemistry for photoreceptor cell death","journal":"Genetics in medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO zebrafish model with mRNA rescue to assess hypomorphic allele function, single lab","pmids":["26820066"],"is_preprint":false},{"year":2017,"finding":"Two compound heterozygous CLUAP1 variants cause ciliopathy: p.(Arg230Ter) reduces protein levels and p.(Met113Arg) reduces intraflagellar transport velocity/function when transfected into Xenopus embryos, demonstrating that both variants impair IFT.","method":"Exome sequencing; Xenopus embryo transfection with mutant CLUAP1 constructs; functional assay of IFT activity","journal":"Cold Spring Harbor molecular case studies","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct functional testing of patient variants in Xenopus IFT system, single lab, single functional readout per variant","pmids":["28679688"],"is_preprint":false},{"year":2019,"finding":"In proliferating cells, Cluap1/IFT38 localizes to the distal appendage of the mother centriole. Upon induction of ciliogenesis, Cluap1 and other IFT-B proteins (IFT46, IFT88) accumulate in a novel non-centriolar cytoplasmic compartment called the 'cytoplasmic IFT spot', which appears early in ciliogenesis and disappears upon completion. This compartment is absent in ciliogenesis-defective cells lacking Cluap1, Kif3a, or Odf2.","method":"Immunofluorescence and confocal microscopy of MEFs and mouse embryos; colocalization with IFT46 and IFT88; comparison between wild-type and ciliogenesis-defective cells","journal":"Genes to cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct subcellular localization with functional correlation across multiple mutant cell lines and embryos, single lab","pmids":["31554018"],"is_preprint":false},{"year":2018,"finding":"CRISPR/Cas9-mediated knockout of Cluap1/IFT38 reveals a novel role in actin cytoskeleton arrangement. In addition to known IFT-B interactions, endogenous-tag-based interactome analysis identified new Cluap1 binding partners including Ephrin-B1, TRIP6 (cytoskeletal regulators), PDGFA, and CCDC6.","method":"CRISPR/Cas9 knockout and endogenous tagging; co-immunoprecipitation and mass spectrometry interactome analysis; actin cytoskeleton phenotyping","journal":"Molecular & cellular proteomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR-based endogenous tagging with MS-based interactome and KO phenotyping, single lab","pmids":["29615496"],"is_preprint":false},{"year":2022,"finding":"IFT38 functions in regulating anterograde IFT and retrograde trafficking of the BBSome in Chlamydomonas. IFT38 connects IFT-B1 and IFT-B2 subcomplexes as part of a connecting tetramer (IFT38/57/88/52); the stability of IFT-B1 and IFT-B2 is mutually dependent and mediated by this connecting tetramer.","method":"Chlamydomonas genetics; deletion mutant analysis; IFT-B subunit stability assays; IFT and BBSome trafficking assays","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct deletion mutant analysis with IFT stability and trafficking readouts, single lab","pmids":["36411782"],"is_preprint":false},{"year":2013,"finding":"CLUAP1/IFT38 contains a divergent N-terminal calponin homology (NN-CH) domain based on profile-to-profile comparisons and structural modeling, placing it in an evolutionarily conserved protein family with IFT57, IFT81, NDC80, and NUF2.","method":"Computational profile-to-profile comparison; structural homology modeling","journal":"Bioinformatics","confidence":"Low","confidence_rationale":"Tier 4 / Weak — computational prediction and structural modeling only, no direct experimental validation of the domain's function","pmids":["24257188"],"is_preprint":false},{"year":2023,"finding":"Depletion of IFT38 (but not most other individual ciliary proteins tested) leads to particularly robust repression of YAP activation upon LPA and S1P stimulation, and attenuates cell proliferation in 2D cultures and tumor spheroids, placing IFT38 as a regulator of serum mitogen-induced Hippo pathway signaling downstream of GPCR activation.","method":"siRNA/RNAi-based screen of 30 ciliary proteins; YAP dephosphorylation assay; target gene induction assay; cell proliferation assay in 2D and 3D cultures","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional screen with specific molecular readout (YAP phosphorylation) and proliferation phenotype, single lab, single study","pmids":["37783116"],"is_preprint":false},{"year":2004,"finding":"CLUAP1 was identified as interacting with nuclear Clusterin using yeast two-hybrid. CLUAP1 protein levels increase in late S to G2/M phases of the cell cycle and return to basal in G0/G1. siRNA-mediated suppression of CLUAP1 results in growth retardation.","method":"Yeast two-hybrid for interaction with Clusterin; cell cycle synchronization with CLUAP1 protein level measurement; siRNA knockdown with proliferation assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid interaction, cell cycle protein level measurement, and siRNA KD phenotype; multiple methods but older study with limited mechanistic follow-up","pmids":["15480429"],"is_preprint":false}],"current_model":"IFT38/Cluap1 is an integral component of the IFT-B peripheral subcomplex that bridges IFT-B1 and IFT-B2 subcomplexes as part of a connecting tetramer (with IFT52, IFT57, IFT88), directly interacts with kinesin-II (via KIF3B) to power anterograde ciliary transport, interacts with BBSome subunits (BBS1/2/9) to mediate export of GPR161 from cilia, undergoes bidirectional IFT movement within cilia, localizes to centriolar distal appendages in non-ciliated cells and to a novel cytoplasmic IFT spot during early ciliogenesis, is absolutely required for axoneme elongation and Hedgehog signaling, and additionally influences actin cytoskeletal arrangement and YAP/Hippo pathway activation downstream of GPCR-mediated serum signaling."},"narrative":{"mechanistic_narrative":"IFT38 (CLUAP1) is an integral peripheral subunit of the intraflagellar transport IFT-B complex that is essential for axoneme elongation and ciliary signaling [PMID:26980730, PMID:23742838]. Within IFT-B it forms a connecting tetramer with IFT52, IFT57, and IFT88 that bridges the IFT-B1 and IFT-B2 subcomplexes, and mutual stability of these subcomplexes depends on this tetramer [PMID:36411782]; the same tetramer directly engages heterotrimeric kinesin-II through KIF3B to couple the IFT train to its anterograde motor, an interaction required for ciliogenesis [PMID:29903877]. IFT38 itself moves bidirectionally along cilia with kinetics matching other IFT-B proteins, confirming it as a bona fide IFT cargo [PMID:24970261]. Functional integration into IFT-B is obligatory: a binding-deficient mutant fails to rescue ciliogenesis in Cluap1-deficient cells, and in knockout mice the basal body docks normally but the axoneme fails to grow and Hedgehog/Shh signaling is lost [PMID:26980730, PMID:23742838, PMID:23351563]. Beyond train assembly, IFT38 directly binds BBSome subunits BBS1, BBS2, and BBS9, and this IFT-B–BBSome link is specifically required to export GPR161 from cilia upon Hedgehog stimulation [PMID:31471295]. During ciliogenesis IFT38 localizes to the mother-centriole distal appendage in proliferating cells and accumulates with other IFT-B proteins in a transient cytoplasmic IFT spot that depends on the ciliogenesis machinery [PMID:31554018]. Hypomorphic and compound-heterozygous CLUAP1 variants that reduce protein level or IFT velocity impair ciliary function and cause photoreceptor degeneration and ciliopathy [PMID:26820066, PMID:28679688]. Additional roles in actin cytoskeletal organization and in GPCR/serum-driven YAP/Hippo activation have been reported [PMID:29615496, PMID:37783116].","teleology":[{"year":2004,"claim":"Before any ciliary role was known, CLUAP1 was first characterized as a cell-cycle-regulated protein, raising the question of its cellular function.","evidence":"Yeast two-hybrid with nuclear Clusterin, cell-cycle protein-level measurement, and siRNA knockdown proliferation assay","pmids":["15480429"],"confidence":"Medium","gaps":["Clusterin interaction not validated by reciprocal or in-cell methods","no link to cilia established at this stage","mechanism of growth retardation unresolved"]},{"year":2012,"claim":"Establishing the gene's physiological role, knockout showed Cluap1 is required for cilia formation and acts upstream of Sonic hedgehog signaling in mammals.","evidence":"Cluap1 knockout mouse with cilia immunofluorescence, qRT-PCR of Shh targets, and beta-galactosidase pathway reporter","pmids":["23351563"],"confidence":"High","gaps":["molecular step within ciliogenesis not pinpointed","biochemical interactions undefined"]},{"year":2013,"claim":"Refining the ciliary defect, Cluap1 was shown to be needed for axoneme elongation rather than basal body docking, and to behave as a transported IFT-B cargo.","evidence":"Knockout mouse phenotyping with tissue-specific rescue plus high-speed in vivo imaging of tagged Cluap1 in Xenopus multiciliated cells compared to IFT20","pmids":["23742838","24970261"],"confidence":"High","gaps":["direct biochemical placement within IFT-B not yet defined","motor coupling unknown"]},{"year":2016,"claim":"Biochemical mapping placed IFT38 in the IFT-B peripheral subcomplex and showed that integration into IFT-B is required for its function, while patient genetics linked CLUAP1 to retinal disease.","evidence":"VIP interaction mapping with binding-deficient rescue in Cluap1-deficient MEFs; whole-exome sequencing with cluap1-knockout zebrafish mRNA rescue","pmids":["26980730","26820066"],"confidence":"High","gaps":["partners bridging IFT-B subcomplexes not yet identified","motor connection unmapped"]},{"year":2018,"claim":"Resolving how IFT-B engages its anterograde motor and tethers accessory subunits, IFT38 was shown to form a connecting tetramer that binds kinesin-II via KIF3B, with IFT80 tethered through IFT38.","evidence":"VIP assay and KIF3B-binding-deficient rescue in KIF3B-knockout cells; 1.8 Angstrom IFT80 crystal structure with structural mapping","pmids":["29903877","29658880"],"confidence":"High","gaps":["IFT80–IFT38 interface not validated by interface mutagenesis","stoichiometry of motor coupling unresolved"]},{"year":2019,"claim":"Defining a signaling-specific output, IFT38 was shown to bind BBSome subunits and to be required for ciliary export of GPR161, and its localization dynamics during ciliogenesis were mapped.","evidence":"VIP assay with separation-of-function IFT38 mutant and GPR161 ciliary localization assay; immunofluorescence of distal appendage and cytoplasmic IFT spot across mutant cells and embryos","pmids":["31471295","31554018"],"confidence":"High","gaps":["functional role of the cytoplasmic IFT spot unresolved","how BBSome binding is coupled to GPR161 cargo selection unknown"]},{"year":2022,"claim":"Cross-species analysis established that the IFT38 connecting tetramer bridges IFT-B1 and IFT-B2 and governs their mutual stability and BBSome trafficking.","evidence":"Chlamydomonas deletion mutant analysis with IFT-B subunit stability and IFT/BBSome trafficking assays","pmids":["36411782"],"confidence":"Medium","gaps":["single-organism deletion analysis","direct interface contacts within the tetramer not defined"]},{"year":2023,"claim":"Beyond canonical ciliary transport, IFT38 was implicated in actin organization and in serum/GPCR-driven YAP/Hippo signaling and proliferation.","evidence":"CRISPR knockout with endogenous-tag interactome (Ephrin-B1, TRIP6, PDGFA, CCDC6); RNAi screen with YAP dephosphorylation and proliferation assays","pmids":["29615496","37783116"],"confidence":"Medium","gaps":["new interactors not orthogonally validated","mechanistic link between IFT38 and YAP regulation unresolved","whether these roles are cilia-dependent unknown"]},{"year":null,"claim":"How IFT38's ciliary transport function mechanistically connects to its reported roles in actin arrangement and Hippo/YAP signaling remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["no defined molecular pathway linking IFT38 to YAP regulation","interactome partners outside IFT-B not confirmed by reciprocal assays","structural model of the IFT38 connecting tetramer interfaces lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,11]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[10]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[4,5,6]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[9]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[9]}],"pathway":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[5,6]}],"complexes":["IFT-B complex","IFT-B connecting tetramer (IFT38-IFT52-IFT57-IFT88)"],"partners":["IFT52","IFT57","IFT88","KIF3B","BBS1","BBS2","BBS9","IFT80"],"other_free_text":[]}},"prefetch_data":{"uniprot":{},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"CLUAP1","url":"https://depmap.org/portal/gene/CLUAP1","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"HSPB11","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/IFT38","total_profiled":1310},"omim":[{"mim_id":"617094","title":"INTRAFLAGELLAR TRANSPORT 52; IFT52","url":"https://www.omim.org/entry/617094"}],"hpa":{"profiled":true,"resolved_as":"CLUAP1","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Primary cilium","reliability":"Supported"},{"location":"Vesicles","reliability":"Additional"},{"location":"Actin filaments","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CLUAP1"},"hgnc":{"alias_symbol":["FLJ13297","KIAA0643","FAP22","CFAP22"],"prev_symbol":["CLUAP1"]},"alphafold":{},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=IFT38","jax_strain_url":"https://www.jax.org/strain/search?query=IFT38"},"sequence":{}},"corpus_meta":[{"pmid":"26980730","id":"PMC_26980730","title":"Overall Architecture of the Intraflagellar Transport (IFT)-B Complex Containing Cluap1/IFT38 as an Essential Component of the IFT-B Peripheral Subcomplex.","date":"2016","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/26980730","citation_count":100,"is_preprint":false},{"pmid":"33536081","id":"PMC_33536081","title":"Genetic variants are identified to increase risk of COVID-19 related mortality from UK Biobank data.","date":"2021","source":"Human 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(not the core). Using the visible immunoprecipitation (VIP) assay, IFT38 was mapped to the peripheral subcomplex of the IFT-B complex composed of 10 core and 6 peripheral subunits. Ciliogenesis defects in Cluap1-deficient mouse embryonic fibroblasts were rescued by wild-type Cluap1 but not by a mutant lacking binding ability to other IFT-B components, establishing that IFT-B complex integration is required for Cluap1 function.\",\n      \"method\": \"Visible immunoprecipitation (VIP) assay for protein-protein interaction mapping; rescue of ciliogenesis defect in Cluap1-deficient MEFs with wild-type vs. binding-deficient mutant Cluap1\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal VIP assay interaction mapping combined with functional mutagenesis rescue in knockout cells; multiple orthogonal methods in one study\",\n      \"pmids\": [\"26980730\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"IFT38 is part of an IFT-B-connecting tetramer (IFT38-IFT52-IFT57-IFT88) that directly interacts with heterotrimeric kinesin-II (KIF3A-KIF3B-KAP3), with KIF3B being the primary contributor to IFT-B binding. This interaction is required for ciliogenesis: KIF3B-knockout cells were rescued by wild-type KIF3B but not by a KIF3B mutant compromised in IFT-B binding.\",\n      \"method\": \"Visible immunoprecipitation (VIP) assay; rescue of ciliogenesis defect in KIF3B-knockout cells with wild-type vs. IFT-B-binding-deficient KIF3B mutant\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — VIP interaction mapping combined with mutagenesis-based rescue in knockout cells, multiple orthogonal methods in one study\",\n      \"pmids\": [\"29903877\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"IFT38 (from the IFT-B complex) directly interacts with BBSome subunits BBS1, BBS2, and BBS9. This IFT-B–BBSome interaction is specifically required for the export of GPR161 from cilia upon Hedgehog signaling stimulation. IFT38-knockout cells expressing a mutant IFT38 lacking BBS1+BBS2+BBS9 binding had restored ciliogenesis but showed significant accumulation of GPR161 within cilia, similar to BBS1-knockout cells.\",\n      \"method\": \"Visible immunoprecipitation (VIP) assay for interaction identification; phenotypic analysis of IFT38-knockout cells expressing wild-type or binding-deficient IFT38 mutant; GPR161 ciliary localization assay\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — VIP assay interaction identification combined with separation-of-function mutagenesis rescue experiment with specific cellular readout\",\n      \"pmids\": [\"31471295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The N-terminal β-propeller of IFT80 tethers IFT80 to the IFT-B complex via IFT38, as revealed by the 1.8 Å crystal structure of Chlamydomonas IFT80 combined with structural mapping.\",\n      \"method\": \"Crystal structure determination (1.8 Å resolution); structural mapping of IFT-B interactions\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — crystal structure with domain mapping to IFT38, but interaction with IFT38 is inferred from structural context rather than directly validated by mutagenesis of the IFT38 interface in this study\",\n      \"pmids\": [\"29658880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Cluap1/IFT38 protein undergoes bidirectional intraflagellar transport along cilia, with similar localization and kinetics to IFT20 (an IFT-B complex component), establishing it as a bona fide IFT-B cargo that moves anterograde and retrograde within cilia.\",\n      \"method\": \"High-speed in vivo confocal imaging of tagged Cluap1 in Xenopus epidermis multiciliated cells; comparison of IFT kinetics with IFT20\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct live imaging of IFT movement with kinetic quantification, single lab but clear functional readout\",\n      \"pmids\": [\"24970261\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Cluap1/IFT38 is preferentially localized to the base and tip of cilia and is required for axoneme elongation (not basal body docking) during ciliogenesis. Knockout mice show that the basal body docks normally but the axoneme fails to grow, and Hedgehog signaling is impaired.\",\n      \"method\": \"Cluap1 knockout mouse generation; immunofluorescence localization; Patched1-lacZ reporter for Hedgehog signaling; crown cell-specific Cluap1 rescue experiment\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct KO phenotyping with subcellular localization, pathway reporter assay, and tissue-specific rescue experiment providing mechanistic specificity\",\n      \"pmids\": [\"23742838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Mammalian Cluap1 localizes to primary cilia and is required for cilia formation; Cluap1 mutant mouse embryos lack cilia at E9.5 and exhibit repressed Sonic hedgehog signaling, placing Cluap1 upstream of Shh pathway activity in mammals.\",\n      \"method\": \"Cluap1 knockout mouse generation; immunofluorescence for cilia; qRT-PCR for Shh target genes; β-galactosidase reporter assay for Shh pathway activity\",\n      \"journal\": \"Cilia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse model with direct ciliary localization, multiple orthogonal pathway readouts, independently confirms findings in other model organisms\",\n      \"pmids\": [\"23351563\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Hypomorphic mutations in CLUAP1 (identified in an LCA patient) reduce but do not abolish cilia function in zebrafish photoreceptors, resulting in photoreceptor cell death. Rescue experiments in cluap1-knockout zebrafish confirmed the hypomorphic nature of the patient mutation, functionally linking CLUAP1 to photoreceptor ciliary maintenance.\",\n      \"method\": \"Whole-exome sequencing; cluap1 knockout zebrafish; mRNA rescue experiments; immunohistochemistry for photoreceptor cell death\",\n      \"journal\": \"Genetics in medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO zebrafish model with mRNA rescue to assess hypomorphic allele function, single lab\",\n      \"pmids\": [\"26820066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Two compound heterozygous CLUAP1 variants cause ciliopathy: p.(Arg230Ter) reduces protein levels and p.(Met113Arg) reduces intraflagellar transport velocity/function when transfected into Xenopus embryos, demonstrating that both variants impair IFT.\",\n      \"method\": \"Exome sequencing; Xenopus embryo transfection with mutant CLUAP1 constructs; functional assay of IFT activity\",\n      \"journal\": \"Cold Spring Harbor molecular case studies\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct functional testing of patient variants in Xenopus IFT system, single lab, single functional readout per variant\",\n      \"pmids\": [\"28679688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In proliferating cells, Cluap1/IFT38 localizes to the distal appendage of the mother centriole. Upon induction of ciliogenesis, Cluap1 and other IFT-B proteins (IFT46, IFT88) accumulate in a novel non-centriolar cytoplasmic compartment called the 'cytoplasmic IFT spot', which appears early in ciliogenesis and disappears upon completion. This compartment is absent in ciliogenesis-defective cells lacking Cluap1, Kif3a, or Odf2.\",\n      \"method\": \"Immunofluorescence and confocal microscopy of MEFs and mouse embryos; colocalization with IFT46 and IFT88; comparison between wild-type and ciliogenesis-defective cells\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct subcellular localization with functional correlation across multiple mutant cell lines and embryos, single lab\",\n      \"pmids\": [\"31554018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CRISPR/Cas9-mediated knockout of Cluap1/IFT38 reveals a novel role in actin cytoskeleton arrangement. In addition to known IFT-B interactions, endogenous-tag-based interactome analysis identified new Cluap1 binding partners including Ephrin-B1, TRIP6 (cytoskeletal regulators), PDGFA, and CCDC6.\",\n      \"method\": \"CRISPR/Cas9 knockout and endogenous tagging; co-immunoprecipitation and mass spectrometry interactome analysis; actin cytoskeleton phenotyping\",\n      \"journal\": \"Molecular & cellular proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR-based endogenous tagging with MS-based interactome and KO phenotyping, single lab\",\n      \"pmids\": [\"29615496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"IFT38 functions in regulating anterograde IFT and retrograde trafficking of the BBSome in Chlamydomonas. IFT38 connects IFT-B1 and IFT-B2 subcomplexes as part of a connecting tetramer (IFT38/57/88/52); the stability of IFT-B1 and IFT-B2 is mutually dependent and mediated by this connecting tetramer.\",\n      \"method\": \"Chlamydomonas genetics; deletion mutant analysis; IFT-B subunit stability assays; IFT and BBSome trafficking assays\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct deletion mutant analysis with IFT stability and trafficking readouts, single lab\",\n      \"pmids\": [\"36411782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CLUAP1/IFT38 contains a divergent N-terminal calponin homology (NN-CH) domain based on profile-to-profile comparisons and structural modeling, placing it in an evolutionarily conserved protein family with IFT57, IFT81, NDC80, and NUF2.\",\n      \"method\": \"Computational profile-to-profile comparison; structural homology modeling\",\n      \"journal\": \"Bioinformatics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — computational prediction and structural modeling only, no direct experimental validation of the domain's function\",\n      \"pmids\": [\"24257188\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Depletion of IFT38 (but not most other individual ciliary proteins tested) leads to particularly robust repression of YAP activation upon LPA and S1P stimulation, and attenuates cell proliferation in 2D cultures and tumor spheroids, placing IFT38 as a regulator of serum mitogen-induced Hippo pathway signaling downstream of GPCR activation.\",\n      \"method\": \"siRNA/RNAi-based screen of 30 ciliary proteins; YAP dephosphorylation assay; target gene induction assay; cell proliferation assay in 2D and 3D cultures\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional screen with specific molecular readout (YAP phosphorylation) and proliferation phenotype, single lab, single study\",\n      \"pmids\": [\"37783116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CLUAP1 was identified as interacting with nuclear Clusterin using yeast two-hybrid. CLUAP1 protein levels increase in late S to G2/M phases of the cell cycle and return to basal in G0/G1. siRNA-mediated suppression of CLUAP1 results in growth retardation.\",\n      \"method\": \"Yeast two-hybrid for interaction with Clusterin; cell cycle synchronization with CLUAP1 protein level measurement; siRNA knockdown with proliferation assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid interaction, cell cycle protein level measurement, and siRNA KD phenotype; multiple methods but older study with limited mechanistic follow-up\",\n      \"pmids\": [\"15480429\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"IFT38/Cluap1 is an integral component of the IFT-B peripheral subcomplex that bridges IFT-B1 and IFT-B2 subcomplexes as part of a connecting tetramer (with IFT52, IFT57, IFT88), directly interacts with kinesin-II (via KIF3B) to power anterograde ciliary transport, interacts with BBSome subunits (BBS1/2/9) to mediate export of GPR161 from cilia, undergoes bidirectional IFT movement within cilia, localizes to centriolar distal appendages in non-ciliated cells and to a novel cytoplasmic IFT spot during early ciliogenesis, is absolutely required for axoneme elongation and Hedgehog signaling, and additionally influences actin cytoskeletal arrangement and YAP/Hippo pathway activation downstream of GPCR-mediated serum signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"IFT38 (CLUAP1) is an integral peripheral subunit of the intraflagellar transport IFT-B complex that is essential for axoneme elongation and ciliary signaling [#0, #5]. Within IFT-B it forms a connecting tetramer with IFT52, IFT57, and IFT88 that bridges the IFT-B1 and IFT-B2 subcomplexes, and mutual stability of these subcomplexes depends on this tetramer [#11]; the same tetramer directly engages heterotrimeric kinesin-II through KIF3B to couple the IFT train to its anterograde motor, an interaction required for ciliogenesis [#1]. IFT38 itself moves bidirectionally along cilia with kinetics matching other IFT-B proteins, confirming it as a bona fide IFT cargo [#4]. Functional integration into IFT-B is obligatory: a binding-deficient mutant fails to rescue ciliogenesis in Cluap1-deficient cells, and in knockout mice the basal body docks normally but the axoneme fails to grow and Hedgehog/Shh signaling is lost [#0, #5, #6]. Beyond train assembly, IFT38 directly binds BBSome subunits BBS1, BBS2, and BBS9, and this IFT-B\\u2013BBSome link is specifically required to export GPR161 from cilia upon Hedgehog stimulation [#2]. During ciliogenesis IFT38 localizes to the mother-centriole distal appendage in proliferating cells and accumulates with other IFT-B proteins in a transient cytoplasmic IFT spot that depends on the ciliogenesis machinery [#9]. Hypomorphic and compound-heterozygous CLUAP1 variants that reduce protein level or IFT velocity impair ciliary function and cause photoreceptor degeneration and ciliopathy [#7, #8]. Additional roles in actin cytoskeletal organization and in GPCR/serum-driven YAP/Hippo activation have been reported [#10, #13].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Before any ciliary role was known, CLUAP1 was first characterized as a cell-cycle-regulated protein, raising the question of its cellular function.\",\n      \"evidence\": \"Yeast two-hybrid with nuclear Clusterin, cell-cycle protein-level measurement, and siRNA knockdown proliferation assay\",\n      \"pmids\": [\"15480429\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Clusterin interaction not validated by reciprocal or in-cell methods\", \"no link to cilia established at this stage\", \"mechanism of growth retardation unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Establishing the gene's physiological role, knockout showed Cluap1 is required for cilia formation and acts upstream of Sonic hedgehog signaling in mammals.\",\n      \"evidence\": \"Cluap1 knockout mouse with cilia immunofluorescence, qRT-PCR of Shh targets, and beta-galactosidase pathway reporter\",\n      \"pmids\": [\"23351563\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"molecular step within ciliogenesis not pinpointed\", \"biochemical interactions undefined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Refining the ciliary defect, Cluap1 was shown to be needed for axoneme elongation rather than basal body docking, and to behave as a transported IFT-B cargo.\",\n      \"evidence\": \"Knockout mouse phenotyping with tissue-specific rescue plus high-speed in vivo imaging of tagged Cluap1 in Xenopus multiciliated cells compared to IFT20\",\n      \"pmids\": [\"23742838\", \"24970261\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"direct biochemical placement within IFT-B not yet defined\", \"motor coupling unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Biochemical mapping placed IFT38 in the IFT-B peripheral subcomplex and showed that integration into IFT-B is required for its function, while patient genetics linked CLUAP1 to retinal disease.\",\n      \"evidence\": \"VIP interaction mapping with binding-deficient rescue in Cluap1-deficient MEFs; whole-exome sequencing with cluap1-knockout zebrafish mRNA rescue\",\n      \"pmids\": [\"26980730\", \"26820066\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"partners bridging IFT-B subcomplexes not yet identified\", \"motor connection unmapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolving how IFT-B engages its anterograde motor and tethers accessory subunits, IFT38 was shown to form a connecting tetramer that binds kinesin-II via KIF3B, with IFT80 tethered through IFT38.\",\n      \"evidence\": \"VIP assay and KIF3B-binding-deficient rescue in KIF3B-knockout cells; 1.8 Angstrom IFT80 crystal structure with structural mapping\",\n      \"pmids\": [\"29903877\", \"29658880\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"IFT80\\u2013IFT38 interface not validated by interface mutagenesis\", \"stoichiometry of motor coupling unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defining a signaling-specific output, IFT38 was shown to bind BBSome subunits and to be required for ciliary export of GPR161, and its localization dynamics during ciliogenesis were mapped.\",\n      \"evidence\": \"VIP assay with separation-of-function IFT38 mutant and GPR161 ciliary localization assay; immunofluorescence of distal appendage and cytoplasmic IFT spot across mutant cells and embryos\",\n      \"pmids\": [\"31471295\", \"31554018\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"functional role of the cytoplasmic IFT spot unresolved\", \"how BBSome binding is coupled to GPR161 cargo selection unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Cross-species analysis established that the IFT38 connecting tetramer bridges IFT-B1 and IFT-B2 and governs their mutual stability and BBSome trafficking.\",\n      \"evidence\": \"Chlamydomonas deletion mutant analysis with IFT-B subunit stability and IFT/BBSome trafficking assays\",\n      \"pmids\": [\"36411782\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"single-organism deletion analysis\", \"direct interface contacts within the tetramer not defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Beyond canonical ciliary transport, IFT38 was implicated in actin organization and in serum/GPCR-driven YAP/Hippo signaling and proliferation.\",\n      \"evidence\": \"CRISPR knockout with endogenous-tag interactome (Ephrin-B1, TRIP6, PDGFA, CCDC6); RNAi screen with YAP dephosphorylation and proliferation assays\",\n      \"pmids\": [\"29615496\", \"37783116\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"new interactors not orthogonally validated\", \"mechanistic link between IFT38 and YAP regulation unresolved\", \"whether these roles are cilia-dependent unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How IFT38's ciliary transport function mechanistically connects to its reported roles in actin arrangement and Hippo/YAP signaling remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"no defined molecular pathway linking IFT38 to YAP regulation\", \"interactome partners outside IFT-B not confirmed by reciprocal assays\", \"structural model of the IFT38 connecting tetramer interfaces lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 11]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [4, 5, 6]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [5, 6]}\n    ],\n    \"complexes\": [\"IFT-B complex\", \"IFT-B connecting tetramer (IFT38-IFT52-IFT57-IFT88)\"],\n    \"partners\": [\"IFT52\", \"IFT57\", \"IFT88\", \"KIF3B\", \"BBS1\", \"BBS2\", \"BBS9\", \"IFT80\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":8,"faith_total":8,"faith_pct":100.0}}