{"gene":"PCNT","run_date":"2026-06-10T05:19:53","timeline":{"discoveries":[{"year":2008,"finding":"Biallelic loss-of-function mutations in PCNT cause microcephalic osteodysplastic primordial dwarfism type II (MOPD II); absence of PCNT results in disorganized mitotic spindles and missegregation of chromosomes.","method":"Genetic linkage analysis, patient cell studies showing mitotic spindle disorganization and chromosome missegregation","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with defined cellular phenotype (spindle disorganization, chromosome missegregation) replicated across 25 patients in a landmark study","pmids":["18174396"],"is_preprint":false},{"year":2018,"finding":"PCNT is delivered co-translationally to centrosomes during early mitosis by cytoplasmic dynein; PCNT mRNA localizes to centrosomes, is translated near centrosomes, and this localization requires intact polysomes.","method":"Live imaging of PCNT mRNA localization, centrosomal enrichment assays, polysome disruption experiments, co-translational targeting assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (mRNA localization, translation assay, polysome requirement) in a single rigorous study","pmids":["29708497"],"is_preprint":false},{"year":2014,"finding":"PCNT forms a complex with Cep68 and Cep215 (CDK5RAP2) at the pericentriolar material; PCNT cleavage mediates Cep215 removal from the core PCM to inhibit centriole disengagement and duplication, while Cep68 degradation removes Cep215 from the peripheral PCM.","method":"Co-immunoprecipitation, mass spectrometry, RNAi knockdown, cell biology assays for centriole engagement/separation","journal":"Nature Cell Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP and MS identification of complex, multiple orthogonal functional assays in single rigorous study","pmids":["25503564"],"is_preprint":false},{"year":2015,"finding":"PLK1 phosphorylates PCNT as a priming step required for separase-mediated cleavage of PCNT during mitotic exit; phospho-resistant PCNT mutants are not cleaved by separase and inhibit centriole separation, while phospho-mimetic mutants rescue centriole separation even in the presence of PLK1 inhibitor.","method":"Phospho-resistant and phospho-mimetic PCNT mutants, separase cleavage assays, PLK1 inhibitor treatment, centriole separation assays","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro cleavage assay with mutagenesis (phospho-resistant and phospho-mimetic), multiple orthogonal experiments confirming mechanism","pmids":["26647647"],"is_preprint":false},{"year":2019,"finding":"PCNT is critical for maintaining centriole association within spindle poles during mitosis; deletion of PCNT causes premature centriole separation and centriole amplification during mitosis. Separase-mediated cleavage of PCNT during mitotic exit is required for centriole separation and centriole-to-mother-centriole conversion.","method":"PCNT deletion (CRISPR/KO), non-cleavable PCNT mutants, TEV protease-induced artificial cleavage, live-cell imaging of centriole behavior","journal":"Journal of Cell Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic deletion, non-cleavable mutant, and artificial cleavage rescue experiments with defined centriole phenotype readouts","pmids":["30814333"],"is_preprint":false},{"year":2020,"finding":"The PCNT-CDK5RAP2 pericentriolar matrix is dispensable for spindle formation when centrioles are present, but becomes essential for spindle assembly when centrioles are absent; acentriolar spindle assembly involves formation of PCNT- and CDK5RAP2-containing foci through a microtubule- and PLK1-dependent process, and requires CDK5RAP2-dependent γ-tubulin complex recruitment.","method":"PCNT and CDK5RAP2 knockout, centriole depletion, auxin-inducible degron, spindle assembly assays, γ-tubulin recruitment assays","journal":"Journal of Cell Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — double-KO genetic epistasis, multiple cell lines, defined molecular requirement for γ-tubulin recruitment in a rigorous study","pmids":["33170211"],"is_preprint":false},{"year":2013,"finding":"PCNT is required at centrosomes for Chk1 localization to centrosomes; depletion of Che-1 abolishes Chk1 binding to pericentrin and centrosomal localization, deregulating centrosomal cyclin B-Cdk1 activation and advancing mitotic entry.","method":"Co-immunoprecipitation of Chk1 with PCNT, siRNA knockdown of Che-1, immunofluorescence localization, centrosomal Cdk1 activity assays","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP showing Chk1-PCNT interaction and functional consequence of Che-1 depletion on PCNT-Chk1 complex, single lab with two methods","pmids":["23798705"],"is_preprint":false},{"year":1996,"finding":"The human PCNT gene was mapped to chromosome 21q between marker PFKL and 21qter; pericentrin is described as a conserved protein component of the filamentous matrix of the centrosome involved in the initial establishment of the organized microtubule array.","method":"Exon trapping, PCR amplification, Southern blot, FISH","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct chromosomal localization by FISH and Southern blot, but functional description derived from mouse pericentrin precedent rather than direct human experiment","pmids":["8812505"],"is_preprint":false},{"year":2021,"finding":"Triple deletion of TP53, PCNT, and CEP215 promotes supernumerary centriole assembly during M phase; PCNT deletion alone causes precocious centriole separation; only two centrioles (formed in S phase) per cell maintain an intact composition including CEP135, CEP192, CEP295, and CEP152.","method":"Triple knockout (CRISPR), cell cycle synchronization, centriole marker immunofluorescence","journal":"Cell Cycle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with triple KO and defined centriole phenotype readout, single lab","pmids":["34233584"],"is_preprint":false},{"year":2025,"finding":"PCNT forms a dynein adaptor complex with non-lipidated LC3 proteins that facilitates influenza A virus (IAV) uncoating at late endosomes; PCNT's role in this process is independent of its centrosomal localization.","method":"Co-immunoprecipitation, dynein adaptor complex reconstitution, IAV uncoating assays; PCNT localization studies","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP evidence for complex formation and functional uncoating assay with localization independence noted, but abstract-level detail limits tier assessment","pmids":["41060632"],"is_preprint":false},{"year":2025,"finding":"CEP152, CEP63, and PCNT are ALMS1-interacting proteins that form aggregates (cartwheel seeds) devoid of ALMS1, which function as seeds for cartwheel assembly and centriole biogenesis independently of pre-existing centrioles.","method":"Co-immunoprecipitation (ALMS1-PCNT interaction), super-resolution imaging, genetic depletion and rescue experiments for de novo centriole formation","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, Co-IP for interaction, functional rescue assays described but not yet peer-reviewed; single study","pmids":["40667363"],"is_preprint":true}],"current_model":"PCNT (pericentrin) is a large centrosomal scaffold protein that is delivered co-translationally to centrosomes by cytoplasmic dynein during early mitosis, where it organizes the pericentriolar material (PCM) by anchoring protein complexes including CDK5RAP2, γ-tubulin, and Chk1; it maintains centriole association within spindle poles throughout mitosis, and its separase-mediated cleavage—primed by PLK1 phosphorylation—during mitotic exit is required for PCM disintegration, centriole separation, and centriole-to-mother-centriole conversion, thereby licensing centriole duplication; loss of PCNT causes disorganized mitotic spindles, chromosome missegregation, and the developmental disorder MOPD II."},"narrative":{"mechanistic_narrative":"PCNT (pericentrin) is a large centrosomal scaffold protein that organizes the pericentriolar material (PCM) and governs centriole engagement and duplication across the mitotic cycle [PMID:25503564, PMID:30814333]. Its mRNA localizes to centrosomes and is translated locally, with the nascent protein delivered co-translationally to centrosomes by cytoplasmic dynein during early mitosis in a polysome-dependent manner [PMID:29708497]. Within the PCM, PCNT forms a complex with Cep68 and CDK5RAP2 (Cep215), and this PCNT–CDK5RAP2 matrix recruits γ-tubulin complexes; the matrix is dispensable for spindle assembly when centrioles are present but becomes essential, through a microtubule- and PLK1-dependent foci-forming process, when centrioles are absent [PMID:25503564, PMID:33170211]. PCNT couples centriole behavior to mitotic progression through regulated proteolysis: PLK1 phosphorylates PCNT as a priming step required for separase-mediated cleavage during mitotic exit, and this cleavage is necessary for PCM disintegration, centriole separation, and centriole-to-mother-centriole conversion that licenses subsequent centriole duplication [PMID:26647647, PMID:30814333]. Loss of PCNT causes premature centriole separation and centriole amplification, while in combination with TP53 and CEP215 loss it drives supernumerary centriole assembly [PMID:30814333, PMID:34233584]. PCNT also anchors Chk1 at centrosomes to restrain centrosomal cyclin B–Cdk1 activation and mitotic entry [PMID:23798705]. Biallelic loss-of-function mutations in PCNT cause microcephalic osteodysplastic primordial dwarfism type II (MOPD II), accompanied by disorganized mitotic spindles and chromosome missegregation [PMID:18174396].","teleology":[{"year":1996,"claim":"Establishing the genomic location and centrosomal nature of human pericentrin set the foundation for studying it as a microtubule-organizing scaffold.","evidence":"Exon trapping, FISH, and Southern blot mapping PCNT to chromosome 21q","pmids":["8812505"],"confidence":"Medium","gaps":["Functional role inferred from mouse precedent rather than direct human experiment","No mechanism of PCM organization established"]},{"year":2008,"claim":"Linking PCNT loss to a human disease with defined mitotic defects established that PCNT is required for faithful spindle organization and chromosome segregation.","evidence":"Genetic linkage and patient cell studies in MOPD II","pmids":["18174396"],"confidence":"High","gaps":["Molecular pathway connecting PCNT loss to spindle disorganization not resolved","Specific PCM partners mediating the defect not identified"]},{"year":2013,"claim":"Identifying PCNT as the centrosomal anchor for Chk1 explained how it gates mitotic entry through local cyclin B–Cdk1 control.","evidence":"Co-IP of Chk1 with PCNT, Che-1 knockdown, centrosomal Cdk1 activity assays","pmids":["23798705"],"confidence":"Medium","gaps":["Single lab with two methods; reciprocal validation limited","Direct binding interface between Chk1 and PCNT not mapped"]},{"year":2014,"claim":"Defining the PCNT–Cep68–CDK5RAP2 complex and the consequence of PCNT cleavage revealed how PCNT restrains centriole disengagement and duplication.","evidence":"Reciprocal Co-IP, mass spectrometry, RNAi, centriole engagement assays","pmids":["25503564"],"confidence":"High","gaps":["Protease responsible for cleavage not identified in this study","Stoichiometry and architecture of the complex unresolved"]},{"year":2015,"claim":"Demonstrating that PLK1 phosphorylation primes separase cleavage of PCNT established the regulatory switch that times PCM disassembly to mitotic exit.","evidence":"Phospho-resistant/phospho-mimetic mutants, separase cleavage assays, PLK1 inhibitor treatment","pmids":["26647647"],"confidence":"High","gaps":["Precise phosphosites and cleavage sites within full-length PCNT not fully mapped","Quantitative contribution of cleavage to overall PCM turnover unknown"]},{"year":2019,"claim":"Showing that PCNT maintains centriole association at spindle poles and that its cleavage drives centriole-to-mother conversion connected PCNT proteolysis directly to the centriole duplication licensing step.","evidence":"CRISPR KO, non-cleavable mutants, TEV-induced artificial cleavage, live-cell imaging","pmids":["30814333"],"confidence":"High","gaps":["Mechanism linking PCM disintegration to centriole conversion not fully detailed","Whether all PCNT pools are subject to cleavage unknown"]},{"year":2020,"claim":"Genetic epistasis established that the PCNT–CDK5RAP2 matrix is conditionally essential — required for acentriolar spindle assembly via γ-tubulin recruitment but dispensable when centrioles are present.","evidence":"PCNT/CDK5RAP2 double KO, centriole depletion, auxin degron, γ-tubulin recruitment assays","pmids":["33170211"],"confidence":"High","gaps":["Molecular basis of PLK1-dependent PCNT foci formation not defined","Redundancy with other PCM scaffolds in centriole-containing cells unresolved"]},{"year":2021,"claim":"Triple-knockout analysis clarified that PCNT loss causes precocious centriole separation and, combined with TP53/CEP215 loss, promotes supernumerary centriole formation, refining its role in centriole number control.","evidence":"Triple CRISPR KO, cell cycle synchronization, centriole marker immunofluorescence","pmids":["34233584"],"confidence":"Medium","gaps":["Single lab; mechanism of cooperation between TP53, PCNT, and CEP215 not dissected","Whether supernumerary centrioles are functional unknown"]},{"year":2025,"claim":"Identifying a centrosome-independent PCNT–LC3 dynein adaptor complex in influenza uncoating expanded PCNT's function beyond the centrosome.","evidence":"Co-IP, dynein adaptor reconstitution, IAV uncoating assays","pmids":["41060632"],"confidence":"Medium","gaps":["Abstract-level detail limits mechanistic resolution","How non-lipidated LC3 engages PCNT structurally not defined"]},{"year":2025,"claim":"Implicating PCNT with CEP152/CEP63 as ALMS1-interacting cartwheel seeds proposed a role in de novo centriole biogenesis independent of pre-existing centrioles.","evidence":"Co-IP, super-resolution imaging, depletion/rescue for de novo centriole formation (preprint)","pmids":["40667363"],"confidence":"Low","gaps":["Preprint, not yet peer-reviewed; single study","Direct PCNT contribution to cartwheel seeding versus passive association unresolved"]},{"year":null,"claim":"How PCNT's distinct functional pools — centrosomal PCM scaffolding, Chk1 anchoring, and centrosome-independent dynein adaptor roles — are spatially and temporally partitioned remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No integrated model distinguishing centrosomal and non-centrosomal PCNT functions","Structural basis of PCNT scaffolding not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[2,5,7]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[6,9]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[1,2,6,7]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[9]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[2,3,4]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[4,5,8]}],"complexes":["PCNT-Cep68-CDK5RAP2 (Cep215) PCM complex","PCNT-LC3 dynein adaptor complex"],"partners":["CDK5RAP2","CEP68","CHEK1","PLK1","ALMS1","CEP152","CEP63"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O95613","full_name":"Pericentrin","aliases":["Kendrin","Pericentrin-B"],"length_aa":3336,"mass_kda":378.0,"function":"Integral component of the filamentous matrix of the centrosome involved in the initial establishment of organized microtubule arrays in both mitosis and meiosis. Plays a role, together with DISC1, in the microtubule network formation. Is an integral component of the pericentriolar material (PCM). May play an important role in preventing premature centrosome splitting during interphase by inhibiting NEK2 kinase activity at the centrosome","subcellular_location":"Cytoplasm, cytoskeleton, microtubule organizing center, centrosome","url":"https://www.uniprot.org/uniprotkb/O95613/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PCNT","classification":"Not Classified","n_dependent_lines":184,"n_total_lines":1208,"dependency_fraction":0.152317880794702},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CALM1","stoichiometry":0.2},{"gene":"CALM2","stoichiometry":0.2},{"gene":"CALM3","stoichiometry":0.2},{"gene":"DYNLL1","stoichiometry":0.2},{"gene":"DYNLL2","stoichiometry":0.2},{"gene":"RAN","stoichiometry":0.2},{"gene":"RANBP1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/PCNT","total_profiled":1310},"omim":[{"mim_id":"620676","title":"COILED-COIL DOMAIN-CONTAINING PROTEIN 61; CCDC61","url":"https://www.omim.org/entry/620676"},{"mim_id":"617791","title":"LEUCINE-RICH REPEAT- AND COILED-COIL DOMAIN-CONTAINING CENTROSOMAL PROTEIN 1; LRRCC1","url":"https://www.omim.org/entry/617791"},{"mim_id":"616889","title":"CENTROSOMAL PROTEIN, 68-KD; CEP68","url":"https://www.omim.org/entry/616889"},{"mim_id":"616426","title":"CENTROSOMAL PROTEIN, 192-KD; CEP192","url":"https://www.omim.org/entry/616426"},{"mim_id":"615890","title":"DYNEIN, CYTOPLASMIC 1, LIGHT INTERMEDIATE CHAIN 1; DYNC1LI1","url":"https://www.omim.org/entry/615890"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Centrosome","reliability":"Supported"},{"location":"Centriolar satellite","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"},{"location":"Flagellar centriole","reliability":"Additional"},{"location":"Mid piece","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"skeletal muscle","ntpm":234.7}],"url":"https://www.proteinatlas.org/search/PCNT"},"hgnc":{"alias_symbol":["KEN","KIAA0402","PCN","PCNTB","SCKL4"],"prev_symbol":["PCNT2"]},"alphafold":{"accession":"O95613","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O95613","model_url":"","pae_url":"","plddt_mean":null},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PCNT","jax_strain_url":"https://www.jax.org/strain/search?query=PCNT"},"sequence":{"accession":"O95613","fasta_url":"https://rest.uniprot.org/uniprotkb/O95613.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O95613/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O95613"}},"corpus_meta":[{"pmid":"10733526","id":"PMC_10733526","title":"The KEN box: an APC recognition signal distinct from the D box targeted by Cdh1.","date":"2000","source":"Genes & 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Endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/33016782","citation_count":4,"is_preprint":false},{"pmid":"31151966","id":"PMC_31151966","title":"Majewski dwarfism type II: an atypical neuroradiological presentation with a novel variant in the PCNT gene.","date":"2019","source":"BMJ case reports","url":"https://pubmed.ncbi.nlm.nih.gov/31151966","citation_count":4,"is_preprint":false},{"pmid":"34418690","id":"PMC_34418690","title":"Coding variants in the PCNT and CEP295 genes contribute to breast cancer risk in Chinese women.","date":"2021","source":"Pathology, research and practice","url":"https://pubmed.ncbi.nlm.nih.gov/34418690","citation_count":3,"is_preprint":false},{"pmid":"35422036","id":"PMC_35422036","title":"Novel frameshift variant in the PCNT gene associated with Microcephalic Osteodysplastic Primordial Dwarfism (MOPD) Type II and small kidneys.","date":"2022","source":"BMC medical 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\"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with defined cellular phenotype (spindle disorganization, chromosome missegregation) replicated across 25 patients in a landmark study\",\n      \"pmids\": [\"18174396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PCNT is delivered co-translationally to centrosomes during early mitosis by cytoplasmic dynein; PCNT mRNA localizes to centrosomes, is translated near centrosomes, and this localization requires intact polysomes.\",\n      \"method\": \"Live imaging of PCNT mRNA localization, centrosomal enrichment assays, polysome disruption experiments, co-translational targeting assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (mRNA localization, translation assay, polysome requirement) in a single rigorous study\",\n      \"pmids\": [\"29708497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PCNT forms a complex with Cep68 and Cep215 (CDK5RAP2) at the pericentriolar material; PCNT cleavage mediates Cep215 removal from the core PCM to inhibit centriole disengagement and duplication, while Cep68 degradation removes Cep215 from the peripheral PCM.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, RNAi knockdown, cell biology assays for centriole engagement/separation\",\n      \"journal\": \"Nature Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP and MS identification of complex, multiple orthogonal functional assays in single rigorous study\",\n      \"pmids\": [\"25503564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PLK1 phosphorylates PCNT as a priming step required for separase-mediated cleavage of PCNT during mitotic exit; phospho-resistant PCNT mutants are not cleaved by separase and inhibit centriole separation, while phospho-mimetic mutants rescue centriole separation even in the presence of PLK1 inhibitor.\",\n      \"method\": \"Phospho-resistant and phospho-mimetic PCNT mutants, separase cleavage assays, PLK1 inhibitor treatment, centriole separation assays\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro cleavage assay with mutagenesis (phospho-resistant and phospho-mimetic), multiple orthogonal experiments confirming mechanism\",\n      \"pmids\": [\"26647647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PCNT is critical for maintaining centriole association within spindle poles during mitosis; deletion of PCNT causes premature centriole separation and centriole amplification during mitosis. Separase-mediated cleavage of PCNT during mitotic exit is required for centriole separation and centriole-to-mother-centriole conversion.\",\n      \"method\": \"PCNT deletion (CRISPR/KO), non-cleavable PCNT mutants, TEV protease-induced artificial cleavage, live-cell imaging of centriole behavior\",\n      \"journal\": \"Journal of Cell Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic deletion, non-cleavable mutant, and artificial cleavage rescue experiments with defined centriole phenotype readouts\",\n      \"pmids\": [\"30814333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The PCNT-CDK5RAP2 pericentriolar matrix is dispensable for spindle formation when centrioles are present, but becomes essential for spindle assembly when centrioles are absent; acentriolar spindle assembly involves formation of PCNT- and CDK5RAP2-containing foci through a microtubule- and PLK1-dependent process, and requires CDK5RAP2-dependent γ-tubulin complex recruitment.\",\n      \"method\": \"PCNT and CDK5RAP2 knockout, centriole depletion, auxin-inducible degron, spindle assembly assays, γ-tubulin recruitment assays\",\n      \"journal\": \"Journal of Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — double-KO genetic epistasis, multiple cell lines, defined molecular requirement for γ-tubulin recruitment in a rigorous study\",\n      \"pmids\": [\"33170211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PCNT is required at centrosomes for Chk1 localization to centrosomes; depletion of Che-1 abolishes Chk1 binding to pericentrin and centrosomal localization, deregulating centrosomal cyclin B-Cdk1 activation and advancing mitotic entry.\",\n      \"method\": \"Co-immunoprecipitation of Chk1 with PCNT, siRNA knockdown of Che-1, immunofluorescence localization, centrosomal Cdk1 activity assays\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP showing Chk1-PCNT interaction and functional consequence of Che-1 depletion on PCNT-Chk1 complex, single lab with two methods\",\n      \"pmids\": [\"23798705\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The human PCNT gene was mapped to chromosome 21q between marker PFKL and 21qter; pericentrin is described as a conserved protein component of the filamentous matrix of the centrosome involved in the initial establishment of the organized microtubule array.\",\n      \"method\": \"Exon trapping, PCR amplification, Southern blot, FISH\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct chromosomal localization by FISH and Southern blot, but functional description derived from mouse pericentrin precedent rather than direct human experiment\",\n      \"pmids\": [\"8812505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Triple deletion of TP53, PCNT, and CEP215 promotes supernumerary centriole assembly during M phase; PCNT deletion alone causes precocious centriole separation; only two centrioles (formed in S phase) per cell maintain an intact composition including CEP135, CEP192, CEP295, and CEP152.\",\n      \"method\": \"Triple knockout (CRISPR), cell cycle synchronization, centriole marker immunofluorescence\",\n      \"journal\": \"Cell Cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with triple KO and defined centriole phenotype readout, single lab\",\n      \"pmids\": [\"34233584\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PCNT forms a dynein adaptor complex with non-lipidated LC3 proteins that facilitates influenza A virus (IAV) uncoating at late endosomes; PCNT's role in this process is independent of its centrosomal localization.\",\n      \"method\": \"Co-immunoprecipitation, dynein adaptor complex reconstitution, IAV uncoating assays; PCNT localization studies\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP evidence for complex formation and functional uncoating assay with localization independence noted, but abstract-level detail limits tier assessment\",\n      \"pmids\": [\"41060632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CEP152, CEP63, and PCNT are ALMS1-interacting proteins that form aggregates (cartwheel seeds) devoid of ALMS1, which function as seeds for cartwheel assembly and centriole biogenesis independently of pre-existing centrioles.\",\n      \"method\": \"Co-immunoprecipitation (ALMS1-PCNT interaction), super-resolution imaging, genetic depletion and rescue experiments for de novo centriole formation\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, Co-IP for interaction, functional rescue assays described but not yet peer-reviewed; single study\",\n      \"pmids\": [\"40667363\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"PCNT (pericentrin) is a large centrosomal scaffold protein that is delivered co-translationally to centrosomes by cytoplasmic dynein during early mitosis, where it organizes the pericentriolar material (PCM) by anchoring protein complexes including CDK5RAP2, γ-tubulin, and Chk1; it maintains centriole association within spindle poles throughout mitosis, and its separase-mediated cleavage—primed by PLK1 phosphorylation—during mitotic exit is required for PCM disintegration, centriole separation, and centriole-to-mother-centriole conversion, thereby licensing centriole duplication; loss of PCNT causes disorganized mitotic spindles, chromosome missegregation, and the developmental disorder MOPD II.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PCNT (pericentrin) is a large centrosomal scaffold protein that organizes the pericentriolar material (PCM) and governs centriole engagement and duplication across the mitotic cycle [#2, #4]. Its mRNA localizes to centrosomes and is translated locally, with the nascent protein delivered co-translationally to centrosomes by cytoplasmic dynein during early mitosis in a polysome-dependent manner [#1]. Within the PCM, PCNT forms a complex with Cep68 and CDK5RAP2 (Cep215), and this PCNT–CDK5RAP2 matrix recruits γ-tubulin complexes; the matrix is dispensable for spindle assembly when centrioles are present but becomes essential, through a microtubule- and PLK1-dependent foci-forming process, when centrioles are absent [#2, #5]. PCNT couples centriole behavior to mitotic progression through regulated proteolysis: PLK1 phosphorylates PCNT as a priming step required for separase-mediated cleavage during mitotic exit, and this cleavage is necessary for PCM disintegration, centriole separation, and centriole-to-mother-centriole conversion that licenses subsequent centriole duplication [#3, #4]. Loss of PCNT causes premature centriole separation and centriole amplification, while in combination with TP53 and CEP215 loss it drives supernumerary centriole assembly [#4, #8]. PCNT also anchors Chk1 at centrosomes to restrain centrosomal cyclin B–Cdk1 activation and mitotic entry [#6]. Biallelic loss-of-function mutations in PCNT cause microcephalic osteodysplastic primordial dwarfism type II (MOPD II), accompanied by disorganized mitotic spindles and chromosome missegregation [#0].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Establishing the genomic location and centrosomal nature of human pericentrin set the foundation for studying it as a microtubule-organizing scaffold.\",\n      \"evidence\": \"Exon trapping, FISH, and Southern blot mapping PCNT to chromosome 21q\",\n      \"pmids\": [\"8812505\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Functional role inferred from mouse precedent rather than direct human experiment\",\n        \"No mechanism of PCM organization established\"\n      ]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Linking PCNT loss to a human disease with defined mitotic defects established that PCNT is required for faithful spindle organization and chromosome segregation.\",\n      \"evidence\": \"Genetic linkage and patient cell studies in MOPD II\",\n      \"pmids\": [\"18174396\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular pathway connecting PCNT loss to spindle disorganization not resolved\",\n        \"Specific PCM partners mediating the defect not identified\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identifying PCNT as the centrosomal anchor for Chk1 explained how it gates mitotic entry through local cyclin B–Cdk1 control.\",\n      \"evidence\": \"Co-IP of Chk1 with PCNT, Che-1 knockdown, centrosomal Cdk1 activity assays\",\n      \"pmids\": [\"23798705\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single lab with two methods; reciprocal validation limited\",\n        \"Direct binding interface between Chk1 and PCNT not mapped\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defining the PCNT–Cep68–CDK5RAP2 complex and the consequence of PCNT cleavage revealed how PCNT restrains centriole disengagement and duplication.\",\n      \"evidence\": \"Reciprocal Co-IP, mass spectrometry, RNAi, centriole engagement assays\",\n      \"pmids\": [\"25503564\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Protease responsible for cleavage not identified in this study\",\n        \"Stoichiometry and architecture of the complex unresolved\"\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrating that PLK1 phosphorylation primes separase cleavage of PCNT established the regulatory switch that times PCM disassembly to mitotic exit.\",\n      \"evidence\": \"Phospho-resistant/phospho-mimetic mutants, separase cleavage assays, PLK1 inhibitor treatment\",\n      \"pmids\": [\"26647647\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Precise phosphosites and cleavage sites within full-length PCNT not fully mapped\",\n        \"Quantitative contribution of cleavage to overall PCM turnover unknown\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showing that PCNT maintains centriole association at spindle poles and that its cleavage drives centriole-to-mother conversion connected PCNT proteolysis directly to the centriole duplication licensing step.\",\n      \"evidence\": \"CRISPR KO, non-cleavable mutants, TEV-induced artificial cleavage, live-cell imaging\",\n      \"pmids\": [\"30814333\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism linking PCM disintegration to centriole conversion not fully detailed\",\n        \"Whether all PCNT pools are subject to cleavage unknown\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Genetic epistasis established that the PCNT–CDK5RAP2 matrix is conditionally essential — required for acentriolar spindle assembly via γ-tubulin recruitment but dispensable when centrioles are present.\",\n      \"evidence\": \"PCNT/CDK5RAP2 double KO, centriole depletion, auxin degron, γ-tubulin recruitment assays\",\n      \"pmids\": [\"33170211\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular basis of PLK1-dependent PCNT foci formation not defined\",\n        \"Redundancy with other PCM scaffolds in centriole-containing cells unresolved\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Triple-knockout analysis clarified that PCNT loss causes precocious centriole separation and, combined with TP53/CEP215 loss, promotes supernumerary centriole formation, refining its role in centriole number control.\",\n      \"evidence\": \"Triple CRISPR KO, cell cycle synchronization, centriole marker immunofluorescence\",\n      \"pmids\": [\"34233584\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single lab; mechanism of cooperation between TP53, PCNT, and CEP215 not dissected\",\n        \"Whether supernumerary centrioles are functional unknown\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identifying a centrosome-independent PCNT–LC3 dynein adaptor complex in influenza uncoating expanded PCNT's function beyond the centrosome.\",\n      \"evidence\": \"Co-IP, dynein adaptor reconstitution, IAV uncoating assays\",\n      \"pmids\": [\"41060632\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Abstract-level detail limits mechanistic resolution\",\n        \"How non-lipidated LC3 engages PCNT structurally not defined\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Implicating PCNT with CEP152/CEP63 as ALMS1-interacting cartwheel seeds proposed a role in de novo centriole biogenesis independent of pre-existing centrioles.\",\n      \"evidence\": \"Co-IP, super-resolution imaging, depletion/rescue for de novo centriole formation (preprint)\",\n      \"pmids\": [\"40667363\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Preprint, not yet peer-reviewed; single study\",\n        \"Direct PCNT contribution to cartwheel seeding versus passive association unresolved\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How PCNT's distinct functional pools — centrosomal PCM scaffolding, Chk1 anchoring, and centrosome-independent dynein adaptor roles — are spatially and temporally partitioned remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No integrated model distinguishing centrosomal and non-centrosomal PCNT functions\",\n        \"Structural basis of PCNT scaffolding not established\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [2, 5, 7]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [6, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [1, 2, 6, 7]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [2, 3, 4]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [4, 5, 8]}\n    ],\n    \"complexes\": [\n      \"PCNT-Cep68-CDK5RAP2 (Cep215) PCM complex\",\n      \"PCNT-LC3 dynein adaptor complex\"\n    ],\n    \"partners\": [\n      \"CDK5RAP2\",\n      \"Cep68\",\n      \"CHEK1\",\n      \"PLK1\",\n      \"ALMS1\",\n      \"CEP152\",\n      \"CEP63\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}