{"gene":"CEP83","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":2014,"finding":"CEP83 is a core component of distal appendages (DAPs) of the mother centriole required for ciliogenesis; biallelic mutations in CEP83 cause altered DAP composition and ciliary defects in patient fibroblasts and tubular renal cells, establishing CEP83 as essential for DAP assembly and cilia initiation.","method":"Targeted exon sequencing, patient fibroblast/renal cell functional analysis, immunofluorescence of DAP composition","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (genetic + cellular phenotype in patient-derived cells) with strong DAP compositional readout","pmids":["24882706"],"is_preprint":false},{"year":2015,"finding":"CEP83 is required for distal appendage-mediated docking of the mother centriole to the plasma membrane in cytotoxic T lymphocytes (CTLs); siRNA knockdown of CEP83 impairs CTL secretory lysosome release at the immunological synapse, demonstrating a role for CEP83 beyond ciliogenesis in transient centrosome docking.","method":"siRNA knockdown, high-resolution TEM tomography, secretion assays in CTLs","journal":"Current biology : CB","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD with defined secretion phenotype and ultrastructural validation, single study","pmids":["26670998"],"is_preprint":false},{"year":2019,"finding":"CEP83 is a bona fide substrate of TTBK2 kinase; TTBK2 phosphorylates CEP83 at four sites in a CEP164-dependent manner (CEP164 recruits TTBK2 to distal appendages), and this phosphorylation is required for early ciliogenesis steps including ciliary vesicle docking and CP110 removal.","method":"Biochemical phosphorylation assays, superresolution microscopy, phosphosite mapping, CEP164-dependent recruitment assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro and in vivo phosphorylation assays with site characterization, superresolution localization, functional ciliogenesis readouts","pmids":["31455668"],"is_preprint":false},{"year":2020,"finding":"CEP83 is phosphorylated by TTBK2 kinase in vitro and in vivo; TTBK2-dependent phosphorylation of CEP83 (along with CEP89, CCDC92, Rabin8, DVL3, and CEP164) contributes to cilia formation control.","method":"In vitro kinase assays, phosphosite mapping by mass spectrometry, cell-based phosphorylation assays","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution of kinase activity with mass spectrometry phosphosite identification, replicated across substrates","pmids":["32129703"],"is_preprint":false},{"year":2020,"finding":"Selective removal of CEP83 in mouse radial glial progenitors (RGPs) eliminates distal appendages and disrupts centrosome anchorage to the apical membrane, causing microtubule disorganization, apical membrane stretching/stiffening, YAP activation, and excessive RGP proliferation leading to cortical enlargement and abnormal folding; simultaneous YAP deletion suppresses the CEP83 KO cortical phenotype, placing CEP83 upstream of YAP mechanosignaling.","method":"Conditional mouse knockout (Cep83 deletion), genetic epistasis (Cep83/Yap double KO), electron microscopy of distal appendages, mechanobiology assays, cortical morphology analysis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1–2 — conditional KO with ultrastructural, mechanical, and genetic epistasis evidence in vivo, replicated with double-mutant rescue","pmids":["32238932"],"is_preprint":false},{"year":2018,"finding":"CEP83 and SCLT1 (core appendage proteins) recruit LRRC45 to the mother centriole, establishing CEP83 as upstream of LRRC45 in the distal appendage assembly hierarchy.","method":"siRNA knockdown of CEP83/SCLT1, immunofluorescence localization of LRRC45","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 — epistasis by KD showing dependency of LRRC45 recruitment on CEP83, single study","pmids":["30131441"],"is_preprint":false},{"year":2019,"finding":"CEP83 is required for RABL2 recruitment to the mother centriole; RABL2 recruitment depends on distal appendage proteins CEP164 and CEP83, linking CEP83-dependent DAP integrity to ciliary GPCR trafficking.","method":"siRNA knockdown of CEP83 and CEP164, immunofluorescence of RABL2 localization","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 — localization dependency established by KD with functional GPCR trafficking readout, single study","pmids":["30578315"],"is_preprint":false},{"year":2019,"finding":"CEP83 (distal appendage protein) is required for GFP-Rabin8 accumulation at the centrosome, and CEP83 interacts with TRAPPC14 (C7orf43), linking CEP83-dependent DAP function to TRAPPII complex-mediated preciliary vesicle tethering at the mother centriole.","method":"Co-immunoprecipitation, siRNA knockdown, fluorescence imaging of Rabin8 centrosomal accumulation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP interaction and KD phenotype with functional ciliogenesis readout, single study","pmids":["31467083"],"is_preprint":false},{"year":2022,"finding":"OFD1, FOPNL, and CEP90 (recruited by MNR/Moonraker) act upstream of CEP83, CEP89, and CEP164 to recruit these distal appendage proteins to the centriole, defining a hierarchical assembly pathway where CEP83 occupies a downstream position relative to these early recruiters.","method":"Ultrastructure expansion microscopy, CRISPR/siRNA knockouts in mammalian cells and Paramecium, immunofluorescence dependency assays","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 — orthogonal methods across two organisms with CRISPR KO dependency mapping, replicated in multiple cell types","pmids":["36070319"],"is_preprint":false},{"year":2025,"finding":"CEP83 forms a functional module with SCLT1 that is critical for structural assembly of distal appendages; CRISPR deletion of CEP83 severely compromises all four key steps of cilium formation (ciliary vesicle recruitment, IFT recruitment/initiation, CP110 removal), with CEP83 and SCLT1 defining one of two critical protein modules (the other being CEP164-TTBK2) required for distal appendage structural integrity.","method":"CRISPR-Cas9 knockouts, superresolution microscopy (DNA-PAINT), functional ciliogenesis step assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 — comprehensive CRISPR KO with superresolution localization and multiple functional step assays, systematic analysis across many proteins","pmids":["39882846"],"is_preprint":false},{"year":2023,"finding":"CEP83-SCLT1 module is critical for distal appendage structural assembly and all four steps of ciliation (ciliary vesicle recruitment, IFT recruitment, IFT initiation, CP110 removal) as shown by CRISPR knockout; CEP83 occupies an early hierarchical position in distal appendage protein recruitment.","method":"CRISPR-Cas9 knockouts, immunofluorescence, localization hierarchy mapping","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — preprint version of the eLife paper with similar CRISPR-based evidence; superseded by peer-reviewed publication","pmids":["36711481"],"is_preprint":true},{"year":2022,"finding":"CEP83 inactivation in human iPSCs disrupts primary cilia formation (absent or elongated cilia) and perturbs differentiation toward intermediate mesoderm (kidney lineage), causing aberrant lateral plate mesoderm specification, demonstrating a role for CEP83-dependent ciliogenesis in mesodermal lineage decisions.","method":"CRISPR inactivation of CEP83 in hiPSCs, single-cell and bulk transcriptomics, organoid culture, cilia immunofluorescence","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with transcriptomic and organoid functional readouts, single study","pmids":["36222666"],"is_preprint":false},{"year":2024,"finding":"siRNA knockdown of CEP83 (along with SCLT1 and CEP164) specifically impairs ciliary assembly and centriole docking, placing CEP83 in a functional subgroup of distal appendage proteins responsible for ciliary assembly (distinct from CEP89/FBF1 which regulate disassembly).","method":"siRNA knockdown, ciliogenesis kinetics assays, immunofluorescence","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 2 — systematic siRNA screen with functional assembly/disassembly readouts, single study","pmids":["39696441"],"is_preprint":false},{"year":2025,"finding":"In zebrafish radial glial progenitors, Pcm1 is asymmetrically associated with Cep83 (used as a mother centrosome marker), and the PARD3-PCM1-CEP83-RAB11 association is conserved in human cortical brain organoids, linking CEP83 at the mother centriole to centrosome asymmetry and fate decisions.","method":"In vivo time-lapse imaging, expansion microscopy, Co-IP in human organoids, zebrafish pcm1 loss-of-function","journal":"Nature communications","confidence":"Low","confidence_rationale":"Tier 3 — CEP83 used as a marker/interactor; primary mechanistic findings concern Pcm1, not CEP83 itself","pmids":["41315244"],"is_preprint":false}],"current_model":"CEP83 is a core distal appendage (DAP) protein of the mother centriole that occupies an early hierarchical position in DAP assembly (downstream of OFD1/FOPNL/CEP90 and upstream of LRRC45, RABL2, and FBF1); it forms a critical structural module with SCLT1 required for all four steps of cilia initiation (ciliary vesicle docking, IFT recruitment, IFT initiation, and CP110 removal), is phosphorylated by TTBK2 kinase (recruited via CEP164) at four sites to regulate early ciliogenesis, anchors the centrosome to the apical membrane in neural progenitors thereby controlling YAP-mediated mechanical signaling and cortical size, and mediates centrosome docking to the plasma membrane in non-ciliated contexts such as cytotoxic T lymphocyte secretion."},"narrative":{"teleology":[{"year":2014,"claim":"Establishing CEP83 as a disease-relevant DAP component resolved the question of whether distal appendage integrity is essential for human ciliogenesis and kidney development, as biallelic CEP83 mutations caused DAP loss, ciliary defects, and nephronophthisis.","evidence":"Targeted exon sequencing, patient fibroblast and renal cell functional analysis, immunofluorescence of DAP composition","pmids":["24882706"],"confidence":"High","gaps":["Precise structural position of CEP83 within DAPs unknown","Upstream regulators of CEP83 centriolar recruitment not defined","Mechanism by which CEP83 loss causes renal disease not resolved"]},{"year":2015,"claim":"CEP83's role in non-ciliary centrosome-membrane docking was demonstrated when its knockdown in cytotoxic T lymphocytes impaired secretory lysosome release at the immunological synapse, extending DAP function beyond ciliogenesis.","evidence":"siRNA knockdown in CTLs, high-resolution TEM tomography, secretion assays","pmids":["26670998"],"confidence":"Medium","gaps":["Single study; independent replication in other non-ciliated docking contexts lacking","Molecular mechanism of DAP-mediated membrane docking in CTLs unresolved"]},{"year":2018,"claim":"Positioning CEP83 in the DAP assembly hierarchy clarified that CEP83 (with SCLT1) acts upstream of LRRC45 recruitment, defining an ordered assembly pathway rather than co-dependent recruitment.","evidence":"siRNA knockdown of CEP83/SCLT1, immunofluorescence of LRRC45 localization","pmids":["30131441"],"confidence":"Medium","gaps":["Direct physical interaction between CEP83 and LRRC45 not demonstrated","Reciprocal dependency not fully tested"]},{"year":2019,"claim":"Identification of CEP83 as a direct TTBK2 substrate resolved how kinase signaling initiates ciliogenesis at DAPs: CEP164 recruits TTBK2, which phosphorylates CEP83 at four sites to trigger ciliary vesicle docking and CP110 removal.","evidence":"Biochemical phosphorylation assays, phosphosite mapping, superresolution microscopy, CEP164-dependent recruitment assays","pmids":["31455668","32129703"],"confidence":"High","gaps":["How phosphorylation alters CEP83 conformation or binding partners is unknown","Whether all four phosphosites are equally required was not dissected"]},{"year":2019,"claim":"CEP83 was linked to preciliary vesicle trafficking through its requirement for RABL2 and Rabin8 centrosomal accumulation and its interaction with TRAPPC14, connecting DAP integrity to vesicular tethering machinery.","evidence":"siRNA knockdown, Co-IP of CEP83-TRAPPC14, fluorescence imaging of Rabin8 and RABL2","pmids":["30578315","31467083"],"confidence":"Medium","gaps":["CEP83-TRAPPC14 interaction shown by single Co-IP without reciprocal validation","Whether CEP83 directly contacts RABL2 or acts indirectly through DAP structure is unresolved"]},{"year":2020,"claim":"Conditional knockout in mouse radial glial progenitors established that CEP83 anchors centrosomes to the apical membrane and thereby constrains YAP-mediated mechanical signaling; loss causes cortical overgrowth reversed by YAP co-deletion, placing CEP83 upstream of tissue-scale mechanosignaling.","evidence":"Conditional Cep83 knockout, Cep83/Yap double KO epistasis, electron microscopy, mechanobiology assays in mouse cortex","pmids":["32238932"],"confidence":"High","gaps":["Whether the phenotype is cilia-dependent or purely docking-dependent is not fully dissected","How membrane stiffening activates YAP mechanistically is unclear"]},{"year":2022,"claim":"Hierarchical mapping revealed that OFD1/FOPNL/CEP90 act upstream of CEP83 recruitment, defining CEP83 as an intermediate rather than initiating factor in DAP biogenesis.","evidence":"Ultrastructure expansion microscopy, CRISPR/siRNA knockouts in mammalian cells and Paramecium","pmids":["36070319"],"confidence":"High","gaps":["Direct physical contacts between upstream recruiters and CEP83 not biochemically defined","Stoichiometry of CEP83 at individual DAPs unknown"]},{"year":2022,"claim":"CEP83 inactivation in human iPSCs demonstrated that CEP83-dependent ciliogenesis is required for proper mesodermal lineage specification, as knockout shifted differentiation from intermediate mesoderm toward lateral plate mesoderm.","evidence":"CRISPR inactivation of CEP83 in hiPSCs, single-cell transcriptomics, organoid culture","pmids":["36222666"],"confidence":"Medium","gaps":["Whether lineage defect is solely cilium-dependent or involves non-ciliary CEP83 functions","Rescue by CEP83 re-expression not demonstrated"]},{"year":2025,"claim":"Systematic CRISPR knockout combined with superresolution microscopy established the CEP83-SCLT1 module as one of two critical DAP units (alongside CEP164-TTBK2) required for structural integrity and all four steps of ciliation, resolving the functional architecture of DAPs.","evidence":"CRISPR-Cas9 knockouts, DNA-PAINT superresolution microscopy, functional ciliogenesis step assays","pmids":["39882846"],"confidence":"High","gaps":["Structural basis for CEP83-SCLT1 interaction not determined at atomic resolution","How the CEP83-SCLT1 module communicates with the CEP164-TTBK2 module is not defined"]},{"year":null,"claim":"Major open questions include the structural basis of the CEP83-SCLT1 module at atomic resolution, how TTBK2-mediated phosphorylation of CEP83 changes its interactions to initiate ciliogenesis, and whether CEP83's non-ciliary docking functions in CTLs and neural progenitors use the same or distinct molecular mechanisms.","evidence":"","pmids":[],"confidence":"High","gaps":["No high-resolution structure of CEP83 or the CEP83-SCLT1 complex","Phosphorylation-dependent conformational or interactome changes uncharacterized","Relative contributions of ciliary vs. non-ciliary CEP83 functions in disease not separated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,5,9]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[0,2,5,8,9]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,9,11]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,4]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,5,8,9]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[4,11]}],"complexes":["distal appendage (CEP83-SCLT1 module)"],"partners":["SCLT1","TTBK2","CEP164","LRRC45","TRAPPC14","RABL2","OFD1","CEP90"],"other_free_text":[]},"mechanistic_narrative":"CEP83 is a core structural component of the distal appendages (DAPs) of the mother centriole that functions as an essential scaffold for centriole-to-membrane docking and primary ciliogenesis. CEP83 forms a critical functional module with SCLT1 that is required for all four steps of cilium initiation—ciliary vesicle recruitment, IFT recruitment, IFT initiation, and CP110 removal—and acts upstream of LRRC45, RABL2, and FBF1 in the DAP assembly hierarchy, while itself depending on OFD1/FOPNL/CEP90 for centriolar recruitment [PMID:39882846, PMID:30131441, PMID:36070319]. CEP83 is phosphorylated by TTBK2 kinase at four sites in a CEP164-dependent manner, and this phosphorylation is required for early ciliogenesis events including ciliary vesicle docking [PMID:31455668, PMID:32129703]. Beyond ciliogenesis, CEP83 anchors centrosomes to the apical membrane in neural progenitors, where its loss activates YAP-dependent mechanosignaling leading to cortical overgrowth, and mediates centrosome docking at the immunological synapse in cytotoxic T lymphocytes for secretory lysosome release; biallelic CEP83 mutations cause nephronophthisis-related ciliopathy with renal tubular defects [PMID:32238932, PMID:26670998, PMID:24882706]."},"prefetch_data":{"uniprot":{"accession":"Q9Y592","full_name":"Centrosomal protein of 83 kDa","aliases":["Coiled-coil domain-containing protein 41","Renal carcinoma antigen NY-REN-58"],"length_aa":701,"mass_kda":82.9,"function":"Component of the distal appendage region of the centriole involved in the initiation of primary cilium assembly. May collaborate with IFT20 in the trafficking of ciliary membrane proteins from the Golgi complex to the cilium during the initiation of primary cilium assembly","subcellular_location":"Cytoplasm, cytoskeleton, microtubule organizing center, centrosome, centriole","url":"https://www.uniprot.org/uniprotkb/Q9Y592/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CEP83","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/CEP83","total_profiled":1310},"omim":[{"mim_id":"621312","title":"LEUCINE-RICH REPEAT-CONTAINING PROTEIN 45; LRRC45","url":"https://www.omim.org/entry/621312"},{"mim_id":"615944","title":"C2 CALCIUM-DEPENDENT DOMAIN-CONTAINING PROTEIN 3; C2CD3","url":"https://www.omim.org/entry/615944"},{"mim_id":"615862","title":"NEPHRONOPHTHISIS 18; NPHP18","url":"https://www.omim.org/entry/615862"},{"mim_id":"615847","title":"CENTROSOMAL PROTEIN, 83-KD; CEP83","url":"https://www.omim.org/entry/615847"},{"mim_id":"611399","title":"SODIUM CHANNEL AND CLATHRIN LINKER 1; SCLT1","url":"https://www.omim.org/entry/611399"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Golgi apparatus","reliability":"Uncertain"},{"location":"Vesicles","reliability":"Uncertain"},{"location":"Primary cilium","reliability":"Uncertain"},{"location":"Primary cilium transition zone","reliability":"Uncertain"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CEP83"},"hgnc":{"alias_symbol":["NY-REN-58","NPHP18"],"prev_symbol":["CCDC41"]},"alphafold":{"accession":"Q9Y592","domains":[{"cath_id":"-","chopping":"111-197_216-355","consensus_level":"medium","plddt":91.8618,"start":111,"end":355},{"cath_id":"-","chopping":"406-601","consensus_level":"medium","plddt":88.6497,"start":406,"end":601}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y592","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y592-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y592-F1-predicted_aligned_error_v6.png","plddt_mean":81.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CEP83","jax_strain_url":"https://www.jax.org/strain/search?query=CEP83"},"sequence":{"accession":"Q9Y592","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y592.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y592/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y592"}},"corpus_meta":[{"pmid":"18199800","id":"PMC_18199800","title":"NEK8 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Part A","url":"https://pubmed.ncbi.nlm.nih.gov/39219159","citation_count":0,"is_preprint":false},{"pmid":"39696441","id":"PMC_39696441","title":"Distinct roles of centriole distal appendage proteins in ciliary assembly and disassembly.","date":"2024","source":"Cell communication and signaling : CCS","url":"https://pubmed.ncbi.nlm.nih.gov/39696441","citation_count":0,"is_preprint":false},{"pmid":"40877293","id":"PMC_40877293","title":"Cortex folding by combined progenitor expansion and adhesion-controlled neuronal migration.","date":"2025","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/40877293","citation_count":0,"is_preprint":false},{"pmid":"37164540","id":"PMC_37164540","title":"Multi-color live-cell fluorescence imaging of primary ciliary membrane assembly and dynamics.","date":"2023","source":"Methods in cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/37164540","citation_count":0,"is_preprint":false},{"pmid":"40581359","id":"PMC_40581359","title":"TTBK2 affects sperm quality by regulating the expression of centrosomal proteins and flagellar transporters during spermiogenesis in mice.","date":"2025","source":"Molecular human reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/40581359","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":15003,"output_tokens":3315,"usd":0.047367},"stage2":{"model":"claude-opus-4-6","input_tokens":6699,"output_tokens":2644,"usd":0.149393},"total_usd":0.19676,"stage1_batch_id":"msgbatch_011kfMfE81o6CTcyhVUqumuW","stage2_batch_id":"msgbatch_01DTputS6WNkH745x1nVSoBo","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2014,\n      \"finding\": \"CEP83 is a core component of distal appendages (DAPs) of the mother centriole required for ciliogenesis; biallelic mutations in CEP83 cause altered DAP composition and ciliary defects in patient fibroblasts and tubular renal cells, establishing CEP83 as essential for DAP assembly and cilia initiation.\",\n      \"method\": \"Targeted exon sequencing, patient fibroblast/renal cell functional analysis, immunofluorescence of DAP composition\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (genetic + cellular phenotype in patient-derived cells) with strong DAP compositional readout\",\n      \"pmids\": [\"24882706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CEP83 is required for distal appendage-mediated docking of the mother centriole to the plasma membrane in cytotoxic T lymphocytes (CTLs); siRNA knockdown of CEP83 impairs CTL secretory lysosome release at the immunological synapse, demonstrating a role for CEP83 beyond ciliogenesis in transient centrosome docking.\",\n      \"method\": \"siRNA knockdown, high-resolution TEM tomography, secretion assays in CTLs\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined secretion phenotype and ultrastructural validation, single study\",\n      \"pmids\": [\"26670998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CEP83 is a bona fide substrate of TTBK2 kinase; TTBK2 phosphorylates CEP83 at four sites in a CEP164-dependent manner (CEP164 recruits TTBK2 to distal appendages), and this phosphorylation is required for early ciliogenesis steps including ciliary vesicle docking and CP110 removal.\",\n      \"method\": \"Biochemical phosphorylation assays, superresolution microscopy, phosphosite mapping, CEP164-dependent recruitment assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro and in vivo phosphorylation assays with site characterization, superresolution localization, functional ciliogenesis readouts\",\n      \"pmids\": [\"31455668\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CEP83 is phosphorylated by TTBK2 kinase in vitro and in vivo; TTBK2-dependent phosphorylation of CEP83 (along with CEP89, CCDC92, Rabin8, DVL3, and CEP164) contributes to cilia formation control.\",\n      \"method\": \"In vitro kinase assays, phosphosite mapping by mass spectrometry, cell-based phosphorylation assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution of kinase activity with mass spectrometry phosphosite identification, replicated across substrates\",\n      \"pmids\": [\"32129703\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Selective removal of CEP83 in mouse radial glial progenitors (RGPs) eliminates distal appendages and disrupts centrosome anchorage to the apical membrane, causing microtubule disorganization, apical membrane stretching/stiffening, YAP activation, and excessive RGP proliferation leading to cortical enlargement and abnormal folding; simultaneous YAP deletion suppresses the CEP83 KO cortical phenotype, placing CEP83 upstream of YAP mechanosignaling.\",\n      \"method\": \"Conditional mouse knockout (Cep83 deletion), genetic epistasis (Cep83/Yap double KO), electron microscopy of distal appendages, mechanobiology assays, cortical morphology analysis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — conditional KO with ultrastructural, mechanical, and genetic epistasis evidence in vivo, replicated with double-mutant rescue\",\n      \"pmids\": [\"32238932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CEP83 and SCLT1 (core appendage proteins) recruit LRRC45 to the mother centriole, establishing CEP83 as upstream of LRRC45 in the distal appendage assembly hierarchy.\",\n      \"method\": \"siRNA knockdown of CEP83/SCLT1, immunofluorescence localization of LRRC45\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis by KD showing dependency of LRRC45 recruitment on CEP83, single study\",\n      \"pmids\": [\"30131441\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CEP83 is required for RABL2 recruitment to the mother centriole; RABL2 recruitment depends on distal appendage proteins CEP164 and CEP83, linking CEP83-dependent DAP integrity to ciliary GPCR trafficking.\",\n      \"method\": \"siRNA knockdown of CEP83 and CEP164, immunofluorescence of RABL2 localization\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — localization dependency established by KD with functional GPCR trafficking readout, single study\",\n      \"pmids\": [\"30578315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CEP83 (distal appendage protein) is required for GFP-Rabin8 accumulation at the centrosome, and CEP83 interacts with TRAPPC14 (C7orf43), linking CEP83-dependent DAP function to TRAPPII complex-mediated preciliary vesicle tethering at the mother centriole.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, fluorescence imaging of Rabin8 centrosomal accumulation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP interaction and KD phenotype with functional ciliogenesis readout, single study\",\n      \"pmids\": [\"31467083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"OFD1, FOPNL, and CEP90 (recruited by MNR/Moonraker) act upstream of CEP83, CEP89, and CEP164 to recruit these distal appendage proteins to the centriole, defining a hierarchical assembly pathway where CEP83 occupies a downstream position relative to these early recruiters.\",\n      \"method\": \"Ultrastructure expansion microscopy, CRISPR/siRNA knockouts in mammalian cells and Paramecium, immunofluorescence dependency assays\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — orthogonal methods across two organisms with CRISPR KO dependency mapping, replicated in multiple cell types\",\n      \"pmids\": [\"36070319\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CEP83 forms a functional module with SCLT1 that is critical for structural assembly of distal appendages; CRISPR deletion of CEP83 severely compromises all four key steps of cilium formation (ciliary vesicle recruitment, IFT recruitment/initiation, CP110 removal), with CEP83 and SCLT1 defining one of two critical protein modules (the other being CEP164-TTBK2) required for distal appendage structural integrity.\",\n      \"method\": \"CRISPR-Cas9 knockouts, superresolution microscopy (DNA-PAINT), functional ciliogenesis step assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — comprehensive CRISPR KO with superresolution localization and multiple functional step assays, systematic analysis across many proteins\",\n      \"pmids\": [\"39882846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CEP83-SCLT1 module is critical for distal appendage structural assembly and all four steps of ciliation (ciliary vesicle recruitment, IFT recruitment, IFT initiation, CP110 removal) as shown by CRISPR knockout; CEP83 occupies an early hierarchical position in distal appendage protein recruitment.\",\n      \"method\": \"CRISPR-Cas9 knockouts, immunofluorescence, localization hierarchy mapping\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — preprint version of the eLife paper with similar CRISPR-based evidence; superseded by peer-reviewed publication\",\n      \"pmids\": [\"36711481\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CEP83 inactivation in human iPSCs disrupts primary cilia formation (absent or elongated cilia) and perturbs differentiation toward intermediate mesoderm (kidney lineage), causing aberrant lateral plate mesoderm specification, demonstrating a role for CEP83-dependent ciliogenesis in mesodermal lineage decisions.\",\n      \"method\": \"CRISPR inactivation of CEP83 in hiPSCs, single-cell and bulk transcriptomics, organoid culture, cilia immunofluorescence\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with transcriptomic and organoid functional readouts, single study\",\n      \"pmids\": [\"36222666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"siRNA knockdown of CEP83 (along with SCLT1 and CEP164) specifically impairs ciliary assembly and centriole docking, placing CEP83 in a functional subgroup of distal appendage proteins responsible for ciliary assembly (distinct from CEP89/FBF1 which regulate disassembly).\",\n      \"method\": \"siRNA knockdown, ciliogenesis kinetics assays, immunofluorescence\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — systematic siRNA screen with functional assembly/disassembly readouts, single study\",\n      \"pmids\": [\"39696441\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In zebrafish radial glial progenitors, Pcm1 is asymmetrically associated with Cep83 (used as a mother centrosome marker), and the PARD3-PCM1-CEP83-RAB11 association is conserved in human cortical brain organoids, linking CEP83 at the mother centriole to centrosome asymmetry and fate decisions.\",\n      \"method\": \"In vivo time-lapse imaging, expansion microscopy, Co-IP in human organoids, zebrafish pcm1 loss-of-function\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — CEP83 used as a marker/interactor; primary mechanistic findings concern Pcm1, not CEP83 itself\",\n      \"pmids\": [\"41315244\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CEP83 is a core distal appendage (DAP) protein of the mother centriole that occupies an early hierarchical position in DAP assembly (downstream of OFD1/FOPNL/CEP90 and upstream of LRRC45, RABL2, and FBF1); it forms a critical structural module with SCLT1 required for all four steps of cilia initiation (ciliary vesicle docking, IFT recruitment, IFT initiation, and CP110 removal), is phosphorylated by TTBK2 kinase (recruited via CEP164) at four sites to regulate early ciliogenesis, anchors the centrosome to the apical membrane in neural progenitors thereby controlling YAP-mediated mechanical signaling and cortical size, and mediates centrosome docking to the plasma membrane in non-ciliated contexts such as cytotoxic T lymphocyte secretion.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CEP83 is a core structural component of the distal appendages (DAPs) of the mother centriole that functions as an essential scaffold for centriole-to-membrane docking and primary ciliogenesis. CEP83 forms a critical functional module with SCLT1 that is required for all four steps of cilium initiation—ciliary vesicle recruitment, IFT recruitment, IFT initiation, and CP110 removal—and acts upstream of LRRC45, RABL2, and FBF1 in the DAP assembly hierarchy, while itself depending on OFD1/FOPNL/CEP90 for centriolar recruitment [PMID:39882846, PMID:30131441, PMID:36070319]. CEP83 is phosphorylated by TTBK2 kinase at four sites in a CEP164-dependent manner, and this phosphorylation is required for early ciliogenesis events including ciliary vesicle docking [PMID:31455668, PMID:32129703]. Beyond ciliogenesis, CEP83 anchors centrosomes to the apical membrane in neural progenitors, where its loss activates YAP-dependent mechanosignaling leading to cortical overgrowth, and mediates centrosome docking at the immunological synapse in cytotoxic T lymphocytes for secretory lysosome release; biallelic CEP83 mutations cause nephronophthisis-related ciliopathy with renal tubular defects [PMID:32238932, PMID:26670998, PMID:24882706].\",\n  \"teleology\": [\n    {\n      \"year\": 2014,\n      \"claim\": \"Establishing CEP83 as a disease-relevant DAP component resolved the question of whether distal appendage integrity is essential for human ciliogenesis and kidney development, as biallelic CEP83 mutations caused DAP loss, ciliary defects, and nephronophthisis.\",\n      \"evidence\": \"Targeted exon sequencing, patient fibroblast and renal cell functional analysis, immunofluorescence of DAP composition\",\n      \"pmids\": [\"24882706\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise structural position of CEP83 within DAPs unknown\", \"Upstream regulators of CEP83 centriolar recruitment not defined\", \"Mechanism by which CEP83 loss causes renal disease not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"CEP83's role in non-ciliary centrosome-membrane docking was demonstrated when its knockdown in cytotoxic T lymphocytes impaired secretory lysosome release at the immunological synapse, extending DAP function beyond ciliogenesis.\",\n      \"evidence\": \"siRNA knockdown in CTLs, high-resolution TEM tomography, secretion assays\",\n      \"pmids\": [\"26670998\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single study; independent replication in other non-ciliated docking contexts lacking\", \"Molecular mechanism of DAP-mediated membrane docking in CTLs unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Positioning CEP83 in the DAP assembly hierarchy clarified that CEP83 (with SCLT1) acts upstream of LRRC45 recruitment, defining an ordered assembly pathway rather than co-dependent recruitment.\",\n      \"evidence\": \"siRNA knockdown of CEP83/SCLT1, immunofluorescence of LRRC45 localization\",\n      \"pmids\": [\"30131441\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct physical interaction between CEP83 and LRRC45 not demonstrated\", \"Reciprocal dependency not fully tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of CEP83 as a direct TTBK2 substrate resolved how kinase signaling initiates ciliogenesis at DAPs: CEP164 recruits TTBK2, which phosphorylates CEP83 at four sites to trigger ciliary vesicle docking and CP110 removal.\",\n      \"evidence\": \"Biochemical phosphorylation assays, phosphosite mapping, superresolution microscopy, CEP164-dependent recruitment assays\",\n      \"pmids\": [\"31455668\", \"32129703\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How phosphorylation alters CEP83 conformation or binding partners is unknown\", \"Whether all four phosphosites are equally required was not dissected\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"CEP83 was linked to preciliary vesicle trafficking through its requirement for RABL2 and Rabin8 centrosomal accumulation and its interaction with TRAPPC14, connecting DAP integrity to vesicular tethering machinery.\",\n      \"evidence\": \"siRNA knockdown, Co-IP of CEP83-TRAPPC14, fluorescence imaging of Rabin8 and RABL2\",\n      \"pmids\": [\"30578315\", \"31467083\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"CEP83-TRAPPC14 interaction shown by single Co-IP without reciprocal validation\", \"Whether CEP83 directly contacts RABL2 or acts indirectly through DAP structure is unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Conditional knockout in mouse radial glial progenitors established that CEP83 anchors centrosomes to the apical membrane and thereby constrains YAP-mediated mechanical signaling; loss causes cortical overgrowth reversed by YAP co-deletion, placing CEP83 upstream of tissue-scale mechanosignaling.\",\n      \"evidence\": \"Conditional Cep83 knockout, Cep83/Yap double KO epistasis, electron microscopy, mechanobiology assays in mouse cortex\",\n      \"pmids\": [\"32238932\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the phenotype is cilia-dependent or purely docking-dependent is not fully dissected\", \"How membrane stiffening activates YAP mechanistically is unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Hierarchical mapping revealed that OFD1/FOPNL/CEP90 act upstream of CEP83 recruitment, defining CEP83 as an intermediate rather than initiating factor in DAP biogenesis.\",\n      \"evidence\": \"Ultrastructure expansion microscopy, CRISPR/siRNA knockouts in mammalian cells and Paramecium\",\n      \"pmids\": [\"36070319\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct physical contacts between upstream recruiters and CEP83 not biochemically defined\", \"Stoichiometry of CEP83 at individual DAPs unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"CEP83 inactivation in human iPSCs demonstrated that CEP83-dependent ciliogenesis is required for proper mesodermal lineage specification, as knockout shifted differentiation from intermediate mesoderm toward lateral plate mesoderm.\",\n      \"evidence\": \"CRISPR inactivation of CEP83 in hiPSCs, single-cell transcriptomics, organoid culture\",\n      \"pmids\": [\"36222666\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether lineage defect is solely cilium-dependent or involves non-ciliary CEP83 functions\", \"Rescue by CEP83 re-expression not demonstrated\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Systematic CRISPR knockout combined with superresolution microscopy established the CEP83-SCLT1 module as one of two critical DAP units (alongside CEP164-TTBK2) required for structural integrity and all four steps of ciliation, resolving the functional architecture of DAPs.\",\n      \"evidence\": \"CRISPR-Cas9 knockouts, DNA-PAINT superresolution microscopy, functional ciliogenesis step assays\",\n      \"pmids\": [\"39882846\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for CEP83-SCLT1 interaction not determined at atomic resolution\", \"How the CEP83-SCLT1 module communicates with the CEP164-TTBK2 module is not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Major open questions include the structural basis of the CEP83-SCLT1 module at atomic resolution, how TTBK2-mediated phosphorylation of CEP83 changes its interactions to initiate ciliogenesis, and whether CEP83's non-ciliary docking functions in CTLs and neural progenitors use the same or distinct molecular mechanisms.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution structure of CEP83 or the CEP83-SCLT1 complex\", \"Phosphorylation-dependent conformational or interactome changes uncharacterized\", \"Relative contributions of ciliary vs. non-ciliary CEP83 functions in disease not separated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 5, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0, 2, 5, 8, 9]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 9, 11]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 5, 8, 9]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4, 11]}\n    ],\n    \"complexes\": [\n      \"distal appendage (CEP83-SCLT1 module)\"\n    ],\n    \"partners\": [\n      \"SCLT1\",\n      \"TTBK2\",\n      \"CEP164\",\n      \"LRRC45\",\n      \"TRAPPC14\",\n      \"RABL2\",\n      \"OFD1\",\n      \"CEP90\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}