{"gene":"CEP70","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":2011,"finding":"CEP70 localizes to the centrosome throughout the cell cycle and directly binds γ-tubulin through peptide fragments containing coiled-coil domains; this interaction is required for centrosomal localization of CEP70. CEP70 is necessary for organization of interphase microtubules and for assembly and orientation of the bipolar mitotic spindle.","method":"Co-immunoprecipitation, domain-mapping pulldowns, siRNA knockdown with immunofluorescence and spindle phenotype readouts","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP with domain mapping plus clean KD with defined mitotic phenotype, single lab but multiple orthogonal methods","pmids":["21795687"],"is_preprint":false},{"year":2012,"finding":"CEP70 is required for angiogenesis: depletion of Cep70 in vascular endothelial cells blocks tube formation, capillary sprouting, membrane ruffling, centrosome reorientation, and microtubule rearrangement in response to migratory stimuli, and impairs Cdc42 and Rac1 activation.","method":"siRNA knockdown in endothelial cells with wound-healing, transwell migration, tube-formation assays; in vivo angiogenesis assay in mice; Cdc42/Rac1 pull-down activity assays","journal":"Cell cycle (Georgetown, Tex.)","confidence":"High","confidence_rationale":"Tier 2 — clean KD with multiple defined cellular phenotypes and in vivo validation, plus Rho GTPase activation assays","pmids":["22437770"],"is_preprint":false},{"year":2014,"finding":"The deubiquitinase CYLD removes polyubiquitin chains from CEP70; this deubiquitination is required for CEP70 to interact with γ-tubulin and localize to the centrosome, thereby enabling ciliogenesis. CYLD knockout mice exhibit ciliary defects attributable in part to loss of CEP70 centrosomal localization.","method":"Co-immunoprecipitation, ubiquitination assays, CYLD knockout mouse model with ciliogenesis phenotyping","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 2 — identified writer (CYLD) of PTM on CEP70 with functional consequence (centrosomal localization, ciliogenesis), validated in KO mouse","pmids":["25342559"],"is_preprint":false},{"year":2015,"finding":"CEP70 promotes microtubule stability by interacting and colocalizing with HDAC6 in the cytoplasm; CEP70 regulates tubulin acetylation through this interaction, enhancing microtubule resistance to cold- or nocodazole-induced depolymerization.","method":"Co-immunoprecipitation, colocalization by immunofluorescence, cold/nocodazole resistance assays, tubulin acetylation western blotting after CEP70 overexpression/knockdown","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2/3 — Co-IP plus functional microtubule stability assay, single lab","pmids":["26112604"],"is_preprint":false},{"year":2009,"finding":"Zebrafish Cep70 (ortholog) is required for ciliogenesis in multiple tissues; morpholino depletion of Cep70 results in shortened (but not absent) cilia, leading to kidney cysts, ear defects, and randomized left-right asymmetry resembling intraflagellar transport mutant phenotypes. Basal bodies and centrosomes are still present in morphants.","method":"Morpholino knockdown in zebrafish embryos, immunofluorescence of cilia length in multiple tissues, phenotypic analysis of kidney, ear, and laterality","journal":"BMC cell biology","confidence":"High","confidence_rationale":"Tier 2 — clean KO phenotype in vertebrate model with defined ciliary readouts across multiple organs","pmids":["19254375"],"is_preprint":false},{"year":2011,"finding":"Chlamydomonas CRC70 (conserved Cep70-family ortholog) localizes preferentially to immature procentrioles and acts as a scaffold for centriole assembly: RNAi knockdown inhibits recruitment of SAS-6 and Bld10p to the centriole, and overexpression of CRC70 in mouse NIH3T3 cells induces formation of centriole-related structures in the cytoplasm.","method":"RNAi in Chlamydomonas, immunofluorescence localization, overexpression in mammalian NIH3T3 cells","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 — conserved ortholog with defined scaffold function validated by KD and OE, cross-species confirmation","pmids":["21878503"],"is_preprint":false},{"year":2016,"finding":"CEP70 overexpression in pancreatic cancer cells causes mislocalization of centrosomal proteins γ-tubulin and pericentrin and formation of intracellular aggregates, leading to microtubule disorganization and multipolar spindle formation during mitosis. Depletion of Cep70 suppresses proliferation and promotes apoptosis; ectopic Cep70 rescues these effects and enhances tumor growth in mice.","method":"siRNA knockdown and ectopic overexpression in pancreatic cancer cell lines, immunofluorescence for centrosomal markers, colony formation and xenograft tumor growth assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2/3 — KD and OE with multiple cellular phenotypes including in vivo, single lab","pmids":["26893288"],"is_preprint":false},{"year":2021,"finding":"CEP70 is essential for acrosome biogenesis and flagella formation during spermiogenesis in mice: CEP70 knockout causes male sterility with abnormal acrosome and flagella structure, germ-cell apoptosis, and a significant decrease in proteins associated with flagella, head, and acrosome formation as well as microtubule cytoskeleton components as shown by quantitative proteomics.","method":"CEP70 knockout mouse model, transmission and scanning electron microscopy, TMT-based quantitative proteomics, human patient mutation screening","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 1/2 — KO mouse with ultrastructural phenotyping plus quantitative proteomics, replicated by patient mutation data","pmids":["33980814"],"is_preprint":false}],"current_model":"CEP70 is a centrosomal protein that binds γ-tubulin (via coiled-coil domains) to localize at the centrosome, where it organizes interphase microtubules, promotes bipolar mitotic spindle assembly, regulates microtubule stability through interaction with HDAC6 and tubulin acetylation, supports ciliogenesis and cell migration/angiogenesis via Cdc42/Rac1 activation, and is essential for acrosome biogenesis and flagella formation during spermiogenesis; its centrosomal localization and γ-tubulin interaction depend on deubiquitination by the tumor suppressor CYLD."},"narrative":{"teleology":[{"year":2009,"claim":"Whether CEP70 functions in ciliogenesis was unknown; zebrafish morpholino depletion established that Cep70 is required for cilium elongation—but not basal body formation—across multiple tissues, linking it to intraflagellar-transport-like ciliary phenotypes.","evidence":"Morpholino knockdown in zebrafish embryos with immunofluorescence of cilia length and organ phenotyping (kidney cysts, laterality defects)","pmids":["19254375"],"confidence":"High","gaps":["Mechanism by which CEP70 promotes cilium elongation not defined","Whether mammalian CEP70 has the same ciliogenesis role was untested"]},{"year":2011,"claim":"How CEP70 is retained at the centrosome was unclear; domain-mapping and Co-IP showed that CEP70 directly binds γ-tubulin via coiled-coil domains, and this interaction is necessary for centrosomal localization, interphase microtubule organization, and bipolar spindle assembly.","evidence":"Reciprocal Co-IP with domain-mapping pulldowns and siRNA knockdown with spindle phenotype readouts in mammalian cells","pmids":["21795687"],"confidence":"High","gaps":["Stoichiometry and structural basis of the CEP70–γ-tubulin complex unknown","Whether CEP70 recruits additional centrosomal effectors not addressed"]},{"year":2011,"claim":"Whether the CEP70 family has a conserved role in centriole biogenesis was untested; Chlamydomonas CRC70 was shown to scaffold centriole assembly by recruiting SAS-6 and Bld10p, and its overexpression in mammalian cells induced ectopic centriole-related structures.","evidence":"RNAi in Chlamydomonas and overexpression in mouse NIH3T3 cells with immunofluorescence","pmids":["21878503"],"confidence":"Medium","gaps":["CRC70 is an ortholog, not human CEP70 itself; direct equivalence of scaffold function in mammalian centriole assembly unconfirmed","Recruitment mechanism for SAS-6 and Bld10p not defined biochemically"]},{"year":2012,"claim":"Whether CEP70 has roles beyond microtubule nucleation was unknown; depletion in endothelial cells revealed that CEP70 is required for angiogenesis by enabling centrosome reorientation, microtubule rearrangement, and activation of Cdc42 and Rac1 during directed migration.","evidence":"siRNA knockdown in endothelial cells with wound-healing, tube-formation, transwell assays, in vivo mouse angiogenesis assay, and Rho GTPase pull-down activity assays","pmids":["22437770"],"confidence":"High","gaps":["How CEP70 activates Cdc42/Rac1 mechanistically is not determined","Relevant GEF intermediary not identified"]},{"year":2014,"claim":"What regulates CEP70 centrosomal targeting was unresolved; CYLD was identified as the deubiquitinase that removes polyubiquitin from CEP70, and this modification is required for CEP70–γ-tubulin interaction, centrosomal localization, and ciliogenesis.","evidence":"Co-IP, ubiquitination assays, and CYLD knockout mouse model with ciliogenesis phenotyping","pmids":["25342559"],"confidence":"High","gaps":["The E3 ubiquitin ligase opposing CYLD on CEP70 is not identified","Specific ubiquitin chain type and modified residues on CEP70 not mapped"]},{"year":2015,"claim":"How CEP70 influences microtubule dynamics beyond nucleation was unclear; CEP70 was found to interact with HDAC6 and modulate tubulin acetylation, thereby enhancing microtubule resistance to depolymerization.","evidence":"Co-IP, colocalization, cold/nocodazole resistance assays, and tubulin acetylation western blotting after CEP70 manipulation","pmids":["26112604"],"confidence":"Medium","gaps":["Whether CEP70 modulates HDAC6 activity directly or acts as a scaffold is unresolved","Functional significance of this interaction relative to centrosomal versus cytoplasmic CEP70 pools not dissected"]},{"year":2016,"claim":"Whether CEP70 dosage affects centrosome integrity and tumorigenesis was untested; overexpression in pancreatic cancer cells caused mislocalization of γ-tubulin and pericentrin, multipolar spindles, and enhanced tumor growth in xenografts.","evidence":"siRNA knockdown and ectopic overexpression in pancreatic cancer cell lines with centrosome marker IF and xenograft assays","pmids":["26893288"],"confidence":"Medium","gaps":["Whether CEP70 overexpression is a driver or passenger in clinical pancreatic cancer unresolved","Mechanism linking CEP70 dosage to centrosomal protein mislocalization not defined"]},{"year":2021,"claim":"Whether CEP70 is essential for mammalian fertility was unknown; knockout mice revealed that CEP70 is indispensable for acrosome biogenesis and flagella formation during spermiogenesis, with quantitative proteomics showing global reduction in flagellar, head, and cytoskeletal proteins.","evidence":"CEP70 knockout mouse, TEM/SEM ultrastructural analysis, TMT-based quantitative proteomics, human patient mutation screening","pmids":["33980814"],"confidence":"High","gaps":["Whether human CEP70 mutations are a significant cause of male infertility in clinical populations requires larger cohorts","Specific step in acrosome vesicle trafficking disrupted by CEP70 loss not identified"]},{"year":null,"claim":"Major unresolved questions include: the structural basis of the CEP70–γ-tubulin interaction, the identity of the E3 ligase that ubiquitinates CEP70 upstream of CYLD, how CEP70 activates Rho GTPases during migration, and the precise step in acrosome biogenesis that requires CEP70.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural or cryo-EM data for CEP70 or its complexes","E3 ligase targeting CEP70 not identified","Mechanism linking CEP70 to Cdc42/Rac1 activation unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,3]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,5]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[0,2,6]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,3]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[2,4]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,2,5]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0,6]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[7]}],"complexes":[],"partners":["TUBG1","HDAC6","CYLD"],"other_free_text":[]},"mechanistic_narrative":"CEP70 is a centrosomal scaffolding protein that organizes microtubule-based structures across multiple cellular contexts, including interphase microtubule networks, mitotic spindles, cilia, and sperm flagella. It directly binds γ-tubulin through coiled-coil domains, and this interaction—regulated by CYLD-mediated deubiquitination—is required for its centrosomal localization and for ciliogenesis [PMID:21795687, PMID:25342559]. CEP70 promotes microtubule stability through interaction with HDAC6 and regulation of tubulin acetylation, and supports cell migration and angiogenesis via activation of Cdc42 and Rac1 [PMID:26112604, PMID:22437770]. In mice, CEP70 knockout causes male sterility due to defective acrosome biogenesis and flagella formation during spermiogenesis [PMID:33980814]."},"prefetch_data":{"uniprot":{"accession":"Q8NHQ1","full_name":"Centrosomal protein of 70 kDa","aliases":["p10-binding protein"],"length_aa":597,"mass_kda":69.8,"function":"Plays a role in the organization of both preexisting and nascent microtubules in interphase cells. During mitosis, required for the organization and orientation of the mitotic spindle","subcellular_location":"Cytoplasm, cytoskeleton, microtubule organizing center, centrosome","url":"https://www.uniprot.org/uniprotkb/Q8NHQ1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CEP70","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CEP70","total_profiled":1310},"omim":[{"mim_id":"614310","title":"CENTROSOMAL PROTEIN, 70-KD; CEP70","url":"https://www.omim.org/entry/614310"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Primary cilium","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"},{"location":"Centrosome","reliability":"Additional"},{"location":"Basal body","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CEP70"},"hgnc":{"alias_symbol":["BITE","FLJ13036"],"prev_symbol":[]},"alphafold":{"accession":"Q8NHQ1","domains":[{"cath_id":"-","chopping":"548-597","consensus_level":"medium","plddt":75.574,"start":548,"end":597},{"cath_id":"1.20.5","chopping":"20-44_57-158","consensus_level":"high","plddt":91.3264,"start":20,"end":158},{"cath_id":"4.10.280","chopping":"478-546","consensus_level":"medium","plddt":81.7422,"start":478,"end":546}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NHQ1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NHQ1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NHQ1-F1-predicted_aligned_error_v6.png","plddt_mean":76.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CEP70","jax_strain_url":"https://www.jax.org/strain/search?query=CEP70"},"sequence":{"accession":"Q8NHQ1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8NHQ1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8NHQ1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NHQ1"}},"corpus_meta":[{"pmid":"20109866","id":"PMC_20109866","title":"Snake bite.","date":"2010","source":"Lancet (London, England)","url":"https://pubmed.ncbi.nlm.nih.gov/20109866","citation_count":588,"is_preprint":false},{"pmid":"26884582","id":"PMC_26884582","title":"Bispecific T-Cell Engager (BiTE) Antibody Construct Blinatumomab for the Treatment of Patients With Relapsed/Refractory Non-Hodgkin Lymphoma: Final Results From a Phase I Study.","date":"2016","source":"Journal of clinical oncology : official journal of the American Society of Clinical Oncology","url":"https://pubmed.ncbi.nlm.nih.gov/26884582","citation_count":347,"is_preprint":false},{"pmid":"31895611","id":"PMC_31895611","title":"Anti-B-Cell Maturation Antigen BiTE Molecule AMG 420 Induces Responses in Multiple Myeloma.","date":"2020","source":"Journal of clinical oncology : official journal of the American Society of Clinical Oncology","url":"https://pubmed.ncbi.nlm.nih.gov/31895611","citation_count":248,"is_preprint":false},{"pmid":"10518220","id":"PMC_10518220","title":"Proteasome active sites allosterically regulate each other, suggesting a cyclical bite-chew mechanism for protein breakdown.","date":"1999","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/10518220","citation_count":231,"is_preprint":false},{"pmid":"2915017","id":"PMC_2915017","title":"Capnocytophaga canimorsus sp. nov. 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CEP70 is necessary for organization of interphase microtubules and for assembly and orientation of the bipolar mitotic spindle.\",\n      \"method\": \"Co-immunoprecipitation, domain-mapping pulldowns, siRNA knockdown with immunofluorescence and spindle phenotype readouts\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with domain mapping plus clean KD with defined mitotic phenotype, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"21795687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CEP70 is required for angiogenesis: depletion of Cep70 in vascular endothelial cells blocks tube formation, capillary sprouting, membrane ruffling, centrosome reorientation, and microtubule rearrangement in response to migratory stimuli, and impairs Cdc42 and Rac1 activation.\",\n      \"method\": \"siRNA knockdown in endothelial cells with wound-healing, transwell migration, tube-formation assays; in vivo angiogenesis assay in mice; Cdc42/Rac1 pull-down activity assays\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with multiple defined cellular phenotypes and in vivo validation, plus Rho GTPase activation assays\",\n      \"pmids\": [\"22437770\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The deubiquitinase CYLD removes polyubiquitin chains from CEP70; this deubiquitination is required for CEP70 to interact with γ-tubulin and localize to the centrosome, thereby enabling ciliogenesis. CYLD knockout mice exhibit ciliary defects attributable in part to loss of CEP70 centrosomal localization.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, CYLD knockout mouse model with ciliogenesis phenotyping\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — identified writer (CYLD) of PTM on CEP70 with functional consequence (centrosomal localization, ciliogenesis), validated in KO mouse\",\n      \"pmids\": [\"25342559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CEP70 promotes microtubule stability by interacting and colocalizing with HDAC6 in the cytoplasm; CEP70 regulates tubulin acetylation through this interaction, enhancing microtubule resistance to cold- or nocodazole-induced depolymerization.\",\n      \"method\": \"Co-immunoprecipitation, colocalization by immunofluorescence, cold/nocodazole resistance assays, tubulin acetylation western blotting after CEP70 overexpression/knockdown\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — Co-IP plus functional microtubule stability assay, single lab\",\n      \"pmids\": [\"26112604\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Zebrafish Cep70 (ortholog) is required for ciliogenesis in multiple tissues; morpholino depletion of Cep70 results in shortened (but not absent) cilia, leading to kidney cysts, ear defects, and randomized left-right asymmetry resembling intraflagellar transport mutant phenotypes. Basal bodies and centrosomes are still present in morphants.\",\n      \"method\": \"Morpholino knockdown in zebrafish embryos, immunofluorescence of cilia length in multiple tissues, phenotypic analysis of kidney, ear, and laterality\",\n      \"journal\": \"BMC cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO phenotype in vertebrate model with defined ciliary readouts across multiple organs\",\n      \"pmids\": [\"19254375\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Chlamydomonas CRC70 (conserved Cep70-family ortholog) localizes preferentially to immature procentrioles and acts as a scaffold for centriole assembly: RNAi knockdown inhibits recruitment of SAS-6 and Bld10p to the centriole, and overexpression of CRC70 in mouse NIH3T3 cells induces formation of centriole-related structures in the cytoplasm.\",\n      \"method\": \"RNAi in Chlamydomonas, immunofluorescence localization, overexpression in mammalian NIH3T3 cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conserved ortholog with defined scaffold function validated by KD and OE, cross-species confirmation\",\n      \"pmids\": [\"21878503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CEP70 overexpression in pancreatic cancer cells causes mislocalization of centrosomal proteins γ-tubulin and pericentrin and formation of intracellular aggregates, leading to microtubule disorganization and multipolar spindle formation during mitosis. Depletion of Cep70 suppresses proliferation and promotes apoptosis; ectopic Cep70 rescues these effects and enhances tumor growth in mice.\",\n      \"method\": \"siRNA knockdown and ectopic overexpression in pancreatic cancer cell lines, immunofluorescence for centrosomal markers, colony formation and xenograft tumor growth assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — KD and OE with multiple cellular phenotypes including in vivo, single lab\",\n      \"pmids\": [\"26893288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CEP70 is essential for acrosome biogenesis and flagella formation during spermiogenesis in mice: CEP70 knockout causes male sterility with abnormal acrosome and flagella structure, germ-cell apoptosis, and a significant decrease in proteins associated with flagella, head, and acrosome formation as well as microtubule cytoskeleton components as shown by quantitative proteomics.\",\n      \"method\": \"CEP70 knockout mouse model, transmission and scanning electron microscopy, TMT-based quantitative proteomics, human patient mutation screening\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — KO mouse with ultrastructural phenotyping plus quantitative proteomics, replicated by patient mutation data\",\n      \"pmids\": [\"33980814\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CEP70 is a centrosomal protein that binds γ-tubulin (via coiled-coil domains) to localize at the centrosome, where it organizes interphase microtubules, promotes bipolar mitotic spindle assembly, regulates microtubule stability through interaction with HDAC6 and tubulin acetylation, supports ciliogenesis and cell migration/angiogenesis via Cdc42/Rac1 activation, and is essential for acrosome biogenesis and flagella formation during spermiogenesis; its centrosomal localization and γ-tubulin interaction depend on deubiquitination by the tumor suppressor CYLD.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CEP70 is a centrosomal scaffolding protein that organizes microtubule-based structures across multiple cellular contexts, including interphase microtubule networks, mitotic spindles, cilia, and sperm flagella. It directly binds γ-tubulin through coiled-coil domains, and this interaction—regulated by CYLD-mediated deubiquitination—is required for its centrosomal localization and for ciliogenesis [PMID:21795687, PMID:25342559]. CEP70 promotes microtubule stability through interaction with HDAC6 and regulation of tubulin acetylation, and supports cell migration and angiogenesis via activation of Cdc42 and Rac1 [PMID:26112604, PMID:22437770]. In mice, CEP70 knockout causes male sterility due to defective acrosome biogenesis and flagella formation during spermiogenesis [PMID:33980814].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Whether CEP70 functions in ciliogenesis was unknown; zebrafish morpholino depletion established that Cep70 is required for cilium elongation—but not basal body formation—across multiple tissues, linking it to intraflagellar-transport-like ciliary phenotypes.\",\n      \"evidence\": \"Morpholino knockdown in zebrafish embryos with immunofluorescence of cilia length and organ phenotyping (kidney cysts, laterality defects)\",\n      \"pmids\": [\"19254375\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which CEP70 promotes cilium elongation not defined\", \"Whether mammalian CEP70 has the same ciliogenesis role was untested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"How CEP70 is retained at the centrosome was unclear; domain-mapping and Co-IP showed that CEP70 directly binds γ-tubulin via coiled-coil domains, and this interaction is necessary for centrosomal localization, interphase microtubule organization, and bipolar spindle assembly.\",\n      \"evidence\": \"Reciprocal Co-IP with domain-mapping pulldowns and siRNA knockdown with spindle phenotype readouts in mammalian cells\",\n      \"pmids\": [\"21795687\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structural basis of the CEP70–γ-tubulin complex unknown\", \"Whether CEP70 recruits additional centrosomal effectors not addressed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Whether the CEP70 family has a conserved role in centriole biogenesis was untested; Chlamydomonas CRC70 was shown to scaffold centriole assembly by recruiting SAS-6 and Bld10p, and its overexpression in mammalian cells induced ectopic centriole-related structures.\",\n      \"evidence\": \"RNAi in Chlamydomonas and overexpression in mouse NIH3T3 cells with immunofluorescence\",\n      \"pmids\": [\"21878503\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"CRC70 is an ortholog, not human CEP70 itself; direct equivalence of scaffold function in mammalian centriole assembly unconfirmed\", \"Recruitment mechanism for SAS-6 and Bld10p not defined biochemically\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Whether CEP70 has roles beyond microtubule nucleation was unknown; depletion in endothelial cells revealed that CEP70 is required for angiogenesis by enabling centrosome reorientation, microtubule rearrangement, and activation of Cdc42 and Rac1 during directed migration.\",\n      \"evidence\": \"siRNA knockdown in endothelial cells with wound-healing, tube-formation, transwell assays, in vivo mouse angiogenesis assay, and Rho GTPase pull-down activity assays\",\n      \"pmids\": [\"22437770\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CEP70 activates Cdc42/Rac1 mechanistically is not determined\", \"Relevant GEF intermediary not identified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"What regulates CEP70 centrosomal targeting was unresolved; CYLD was identified as the deubiquitinase that removes polyubiquitin from CEP70, and this modification is required for CEP70–γ-tubulin interaction, centrosomal localization, and ciliogenesis.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, and CYLD knockout mouse model with ciliogenesis phenotyping\",\n      \"pmids\": [\"25342559\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The E3 ubiquitin ligase opposing CYLD on CEP70 is not identified\", \"Specific ubiquitin chain type and modified residues on CEP70 not mapped\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"How CEP70 influences microtubule dynamics beyond nucleation was unclear; CEP70 was found to interact with HDAC6 and modulate tubulin acetylation, thereby enhancing microtubule resistance to depolymerization.\",\n      \"evidence\": \"Co-IP, colocalization, cold/nocodazole resistance assays, and tubulin acetylation western blotting after CEP70 manipulation\",\n      \"pmids\": [\"26112604\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CEP70 modulates HDAC6 activity directly or acts as a scaffold is unresolved\", \"Functional significance of this interaction relative to centrosomal versus cytoplasmic CEP70 pools not dissected\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Whether CEP70 dosage affects centrosome integrity and tumorigenesis was untested; overexpression in pancreatic cancer cells caused mislocalization of γ-tubulin and pericentrin, multipolar spindles, and enhanced tumor growth in xenografts.\",\n      \"evidence\": \"siRNA knockdown and ectopic overexpression in pancreatic cancer cell lines with centrosome marker IF and xenograft assays\",\n      \"pmids\": [\"26893288\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CEP70 overexpression is a driver or passenger in clinical pancreatic cancer unresolved\", \"Mechanism linking CEP70 dosage to centrosomal protein mislocalization not defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Whether CEP70 is essential for mammalian fertility was unknown; knockout mice revealed that CEP70 is indispensable for acrosome biogenesis and flagella formation during spermiogenesis, with quantitative proteomics showing global reduction in flagellar, head, and cytoskeletal proteins.\",\n      \"evidence\": \"CEP70 knockout mouse, TEM/SEM ultrastructural analysis, TMT-based quantitative proteomics, human patient mutation screening\",\n      \"pmids\": [\"33980814\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether human CEP70 mutations are a significant cause of male infertility in clinical populations requires larger cohorts\", \"Specific step in acrosome vesicle trafficking disrupted by CEP70 loss not identified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Major unresolved questions include: the structural basis of the CEP70–γ-tubulin interaction, the identity of the E3 ligase that ubiquitinates CEP70 upstream of CYLD, how CEP70 activates Rho GTPases during migration, and the precise step in acrosome biogenesis that requires CEP70.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural or cryo-EM data for CEP70 or its complexes\", \"E3 ligase targeting CEP70 not identified\", \"Mechanism linking CEP70 to Cdc42/Rac1 activation unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0, 2, 6]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [2, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 2, 5]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 6]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"TUBG1\",\n      \"HDAC6\",\n      \"CYLD\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}