{"gene":"CDK5RAP2","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2007,"finding":"CDK5RAP2 localizes throughout the pericentriolar material (PCM) in all cell cycle stages and associates with the γ-tubulin ring complex (γTuRC) via a short conserved sequence. This binding is required for γTuRC attachment to the centrosome (but not γTuRC assembly), and perturbing CDK5RAP2 function delocalizes γ-tubulin from centrosomes and inhibits centrosomal microtubule nucleation, leading to disorganized interphase microtubule arrays and anastral mitotic spindles.","method":"Co-immunoprecipitation, overexpression, RNAi knockdown, immunofluorescence, microtubule nucleation assays","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, RNAi loss-of-function with defined cellular phenotypes, replicated across multiple studies","pmids":["17959831"],"is_preprint":false},{"year":2010,"finding":"CDK5RAP2 contains a γ-TuRC-mediated nucleation activator (γ-TuNA) domain that directly stimulates microtubule nucleation by purified γTuRC in vitro. γ-TuNA associates with γTuRC containing NME7, FAM128A/B, and actin in addition to γ-tubulin and GCP2-6. RNAi depletion of CDK5RAP2 impairs both centrosomal and acentrosomal microtubule nucleation without affecting γTuRC assembly.","method":"In vitro microtubule nucleation assay with purified γTuRC, co-immunoprecipitation, RNAi, microtubule regrowth assay, active-site/binding-domain mutagenesis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified components, mutagenesis of binding domain, and RNAi functional validation; replicated concept across multiple labs","pmids":["21135143"],"is_preprint":false},{"year":2007,"finding":"CDK5RAP2 (Cep215) is required for centrosome cohesion during interphase. Unlike rootletin/Cep68 which form centriole-associated fibres, Cep215 associates with centrosomes throughout the cell cycle and functionally interacts with pericentrin to influence centrosome cohesion through a mechanism related to cytoskeletal dynamics.","method":"RNAi knockdown, immunofluorescence, co-immunoprecipitation, overexpression","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi with defined centrosome cohesion phenotype, co-IP for pericentrin interaction; single lab","pmids":["18042621"],"is_preprint":false},{"year":2010,"finding":"CDK5RAP2 localizes to the Golgi complex in an ATP- and centrosome-dependent manner and associates with Golgi membranes independently of microtubules. A CM2-like motif in CDK5RAP2 is essential for centrosomal and Golgi localization by mediating binding to pericentrin (required for both centrosomal and Golgi localization) and AKAP450 (required for Golgi localization). Calmodulin binding to this motif is dispensable for centrosomal and Golgi association.","method":"Mutational analysis, co-immunoprecipitation, immunofluorescence, subcellular fractionation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutational approach with defined functional readouts, co-IP for binding partners; single lab, multiple orthogonal methods","pmids":["20466722"],"is_preprint":false},{"year":2010,"finding":"CDK5RAP2 interacts with EB1 via a conserved basic and Ser-rich motif containing an Ile/Leu-Pro dipeptide, enabling CDK5RAP2 to track growing microtubule plus-ends. Mutation of the Ile/Leu-Pro dipeptide abolishes EB1 interaction and plus-end attachment. The CDK5RAP2-EB1 complex regulates microtubule dynamics, stability, and bundling; CDK5RAP2 depletion impairs microtubule dynamic behaviors, and the complex stimulates microtubule assembly and bundle formation in vitro.","method":"Co-immunoprecipitation, site-directed mutagenesis, live cell imaging, RNAi, in vitro microtubule assembly assay","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution, mutagenesis abolishing EB1 interaction, live imaging, RNAi phenotype; single lab with multiple orthogonal methods","pmids":["19553473"],"is_preprint":false},{"year":2010,"finding":"CDK5RAP2 loss-of-function in mice causes centriole amplification with a preponderance of unpaired single centrioles and daughter-daughter centriole pairs, indicating CDK5RAP2 is required to maintain centriole engagement and cohesion to restrict centriole replication. Early in mitosis, amplified centrosomes assemble multipolar spindles. Excess mother centrioles also template multiple primary cilia.","method":"Mouse knockout model (Cdk5rap2 mutant), electron microscopy, immunofluorescence, cilia analysis","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo mouse KO with ultrastructural analysis, multiple independent phenotypic readouts; replicated concept across labs","pmids":["20627074"],"is_preprint":false},{"year":2010,"finding":"CDK5RAP2 links centrosomes to mitotic spindle poles via two evolutionarily conserved domains, CNN1 and CNN2, in vertebrate cells. The CNN1 domain is required for recruiting specific PCM components that mediate centrosome-spindle pole attachment, and also enforces centriole cohesion during interphase and promotes efficient DNA damage-induced G2 cell cycle arrest.","method":"Domain deletion mutagenesis, gene disruption in DT40 cells, immunofluorescence, DNA damage response assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — domain-specific mutagenesis in vertebrate cells, multiple phenotypic readouts (spindle pole attachment, centriole cohesion, DNA damage checkpoint); rigorous epistatic analysis","pmids":["20368616"],"is_preprint":false},{"year":2010,"finding":"Cdk5rap2 interacts with pericentrin in neural progenitor cells, and loss of Cdk5rap2 depletes apical progenitors and increases cell-cycle exit leading to premature neuronal differentiation. Depletion of pericentrin phenocopies Cdk5rap2 knockdown and results in decreased Cdk5rap2 recruitment to the centrosome, establishing a functional epistatic relationship.","method":"RNAi knockdown in neural progenitors, co-immunoprecipitation, immunofluorescence, cell cycle analysis","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal knockdowns with phenocopy, co-IP for interaction, defined cellular phenotype in neurogenesis; replicated with mouse model","pmids":["20471352"],"is_preprint":false},{"year":2010,"finding":"Cdk5rap2 mouse mutants exhibit microcephaly resulting from neurogenic defects including premature cell cycle exit and apoptosis of neuronal progenitors, associated with impaired mitotic progression, abnormal spindle pole number, and abnormal mitotic orientation. The an mutation is a genomic inversion causing an in-frame deletion of exon 4.","method":"Mouse mutant model (Hertwig's anemia an/an), BrdU/EdU labeling, immunofluorescence, spindle pole analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo mouse model with defined molecular lesion, multiple orthogonal readouts of neurogenesis, spindle, and apoptosis","pmids":["20460369"],"is_preprint":false},{"year":2010,"finding":"CEP215 (CDK5RAP2) is involved in dynein-dependent accumulation of pericentriolar matrix proteins for spindle pole formation. Knockdown of CEP215 results in monopolar spindle formation, decreased inter-pole distance, and centrosome detachment from spindle poles. CEP215 is critical for centrosomal localization of dynein throughout the cell cycle, and its own centrosomal localization depends on the dynein-dynactin complex.","method":"RNAi knockdown, immunofluorescence, live cell imaging","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi with multiple cellular phenotype readouts, dynein dependency demonstrated; single lab","pmids":["20139723"],"is_preprint":false},{"year":2013,"finding":"CDK5RAP2 displays highly dynamic attachment to centrosomes in a microtubule-dependent manner. CDK5RAP2 associates with the retrograde transporter dynein-dynactin and contains a sequence motif that binds dynein light chain 8. Disruption of dynein-dynactin function reduces centrosomal CDK5RAP2 levels.","method":"FRAP (live cell imaging), co-immunoprecipitation, dominant-negative dynein-dynactin disruption","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRAP with functional consequence, co-IP for dynein interaction, dominant-negative perturbation; single lab","pmids":["23874654"],"is_preprint":false},{"year":2014,"finding":"CEP215 (CDK5RAP2) forms a complex with Cep68 and PCNT (pericentrin). Cep68 degradation via SCF(βTrCP) (initiated by PLK1 phosphorylation at Ser332) allows CEP215 removal from the peripheral PCM to prevent centriole separation following disengagement, while PCNT cleavage mediates CEP215 removal from the core PCM to inhibit centriole disengagement and duplication.","method":"Co-immunoprecipitation, mass spectrometry, protein degradation assays, phospho-site mutagenesis","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP establishing complex, mass spectrometry, PLK1 phospho-site mutagenesis, proteolysis assays; multiple orthogonal methods","pmids":["25503564"],"is_preprint":false},{"year":2014,"finding":"CEP215 and pericentrin are interdependent for their accumulation at spindle poles during mitosis. The CEP215-pericentrin interaction is required for centrosome maturation and subsequent bipolar spindle formation during mitosis. CEP215 interaction with γ-tubulin is dispensable for centrosome maturation.","method":"RNAi knockdown-rescue experiments with domain mutants, immunofluorescence","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockdown-rescue with domain mutants, multiple functional readouts; single lab","pmids":["24466316"],"is_preprint":false},{"year":2015,"finding":"LRRK1, activated by PLK1 phosphorylation at Ser1790, phosphorylates CDK5RAP2 at Ser140 within its γ-tubulin-binding motif. This phosphorylation promotes CDK5RAP2-γ-tubulin interaction and CDK5RAP2-dependent microtubule nucleation from centrosomes, thereby regulating mitotic spindle orientation.","method":"In vitro kinase assay, phospho-site mutagenesis, co-immunoprecipitation, immunofluorescence, spindle orientation assay","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay, phospho-site mutagenesis, co-IP for interaction, multiple orthogonal functional readouts","pmids":["26192437"],"is_preprint":false},{"year":2016,"finding":"CEP215 directly binds the minus-end-directed microtubule motor HSET (KIFC1). Targeted deletion of the HSET-binding domain of CEP215 causes centrosome detachment and HSET depletion at centrosomes. The CEP215-HSET complex promotes clustering of extra centrosomes into pseudo-bipolar spindles in cancer cells with centrosome amplification.","method":"Proteomic profiling, co-immunoprecipitation, targeted domain deletion in vertebrate cells, immunofluorescence","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — proteomic identification plus co-IP, domain deletion with defined phenotype, patient-derived cell validation","pmids":["26987684"],"is_preprint":false},{"year":2009,"finding":"CDK5RAP2 is required for spindle checkpoint function. CDK5RAP2 knockdown causes chromosome mis-segregation, fails to maintain the spindle checkpoint, reduces expression of spindle checkpoint proteins BUBR1 and MAD2, and increases chromatin-associated CDC20. CDK5RAP2 resides on BUBR1 and MAD2 promoters and regulates their transcription.","method":"RNAi knockdown, chromatin immunoprecipitation (ChIP), flow cytometry, immunoblotting","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP for promoter binding, RNAi with defined spindle checkpoint phenotype; single lab, two orthogonal methods","pmids":["19282672"],"is_preprint":false},{"year":2017,"finding":"ASPM functions redundantly with CDK5RAP2 in spindle pole organization during mitotic metaphase in human cells. Depletion of CDK5RAP2 in ASPM knockout cells causes spindle pole unfocusing and delayed anaphase onset. The pole-focusing function of CDK5RAP2 is independent of its known role to localize HSET or to activate the γ-tubulin complex.","method":"CRISPR-based gene knockout, auxin-inducible degron, RNAi, immunofluorescence","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR KO combined with auxin-inducible degron system, genetic epistasis, multiple functional readouts","pmids":["28883092"],"is_preprint":false},{"year":2020,"finding":"The PCNT-CDK5RAP2 pericentriolar matrix becomes essential for mitotic spindle assembly when centrioles are absent. In acentriolar cells, PCNT and CDK5RAP2 form foci via a microtubule- and PLK1-dependent process. Foci formation and spindle assembly require PCNT-CDK5RAP2-dependent matrix assembly and the ability of CDK5RAP2 to recruit γ-tubulin complexes.","method":"Centriole inhibition (centrinone), CRISPR KO of PCNT and CDK5RAP2, immunofluorescence, live cell imaging","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis using multiple KO combinations, multiple orthogonal methods, tested in multiple cell lines","pmids":["33170211"],"is_preprint":false},{"year":2020,"finding":"CEP215 (CDK5RAP2) localizes to acentriolar MTOCs (aMTOCs) in mouse oocytes in a pericentrin-dependent manner and participates in regulation of meiotic spindle pole focusing. Aurora Kinase A inhibition causes striking loss of the ring-like aMTOC organization and pronounced CEP215 clustering. Unlike in mitotic cells, CEP215 depletion in oocytes does not reduce γ-tubulin at aMTOCs.","method":"siRNA knockdown, Aurora Kinase A inhibition, super-resolution microscopy, immunofluorescence","journal":"Reproduction (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with defined spindle phenotype, super-resolution imaging, pharmacological inhibition; single lab","pmids":["31895686"],"is_preprint":false},{"year":2021,"finding":"Loss of CDK5RAP2 causes premature cell senescence through a GSK3β/β-catenin/WIP1 pathway. CDK5RAP2 interacts with GSK3β and causes inhibitory Ser9 phosphorylation of GSK3β. Loss of CDK5RAP2 increases GSK3β activity, reducing nuclear β-catenin and thereby downregulating the NF-κB target gene WIP1, which leads to elevated p53 Ser15 phosphorylation and senescence. Ectopic WIP1 expression reverses the senescent phenotype.","method":"RNAi knockdown, co-immunoprecipitation, phospho-immunoblotting, rescue experiments with ectopic expression","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP for CDK5RAP2-GSK3β interaction, knockdown-rescue, pathway epistasis via GSK3β inhibition; single lab","pmids":["34930892"],"is_preprint":false},{"year":2021,"finding":"CDK5RAP2 functions as a positive transcriptional regulator of CENP-A. CDK5RAP2 is present in the nucleus, interacts with the CENP-A promoter, and upregulates CENP-A transcription. Loss of CDK5RAP2 reduces centromeric CENP-A levels and causes lagging chromosomes, micronuclei, and chromatin bridges. Exogenous CENP-A expression partially rescues lagging chromosomes in CDK5RAP2 knockdown cells.","method":"RNAi knockdown, chromatin immunoprecipitation (ChIP), ectopic expression rescue, immunofluorescence","journal":"Biomedicine & pharmacotherapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP establishes promoter binding, knockdown-rescue epistasis; single lab","pmids":["33725591"],"is_preprint":false},{"year":2022,"finding":"Pathogenic LRRK2 causes centrosomal displacement of CDK5RAP2 via a mechanism requiring Rab protein phosphorylation by LRRK2 and RILPL1. The pathogenic LRRK2-mediated centrosomal cohesion deficits are dependent on both the GTP conformation and phosphorylation status of Rab proteins. CDK5RAP2 displacement by LRRK2 does not involve displacement of proteinaceous linker proteins but specifically requires phospho-Rab/RILPL1 centrosomal association.","method":"iPSC-derived cells from patients, transiently transfected cell lines, immunofluorescence, LRRK2 kinase inhibition","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient-derived iPSC validation plus mechanistic cell line experiments, pharmacological and genetic perturbations; single lab","pmids":["35721463"],"is_preprint":false},{"year":2024,"finding":"CDK5RAP2's centrosomin motif 1 (CM1) induces partial closure of the γ-TuRC by binding multiple modules containing MZT2, GCP2, and CDK5RAP2, resulting in long-range constriction of the γ-tubulin ring toward the geometry of 13-protofilament microtubules. Additional CDK5RAP2 promotes γ-TuRC decoration and stimulates microtubule-nucleating activities in single-molecule assays.","method":"Cryo-EM structure determination, in vitro single-molecule microtubule nucleation assay, reconstituted human γ-TuRC","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure with in vitro functional validation using reconstituted complex and single-molecule assays","pmids":["39321808"],"is_preprint":false},{"year":2016,"finding":"CDK5RAP2 interacts with Hippo signaling pathway components MST1 kinase and the transcriptional regulator TAZ. In patient fibroblasts with CDK5RAP2 mutations, higher levels of TAZ and YAP are observed, but common Hippo target genes are downregulated while BIRC5 (Survivin) is upregulated.","method":"Co-immunoprecipitation, patient-derived fibroblasts, immunoblotting","journal":"Molecular genetics and genomics : MGG","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single co-IP for MST1/TAZ interaction, no functional validation of direct mechanism; single lab, single method","pmids":["28004182"],"is_preprint":false},{"year":2015,"finding":"Cep169 is a novel centrosomal protein that directly interacts with CDK5RAP2 through CM1, an evolutionarily conserved domain, and colocalizes with CDK5RAP2 at the PCM and at microtubule plus-ends via EB1. Cep169 regulates microtubule stability; its depletion induces microtubule depolymerization but it is not required for γ-tubulin assembly at centrosomes by CDK5RAP2.","method":"Co-immunoprecipitation, RNAi knockdown, immunofluorescence, EB1-binding domain mutagenesis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP for direct interaction, domain mutagenesis, RNAi phenotype; single lab","pmids":["26485573"],"is_preprint":false},{"year":2020,"finding":"A mitosis-specific centrosome-targeting domain of Cep215 (215N) interacts with Cep192 and phosphorylated Aurora A (pAurA), with Cep192 being essential for targeting 215N to centrosomes and centrosomal localization of 215N and pAurA being mutually dependent. Rescue experiments show Cep215 maintains structural integrity of spindle poles by providing a platform for centrosome maturation molecules, with relatively minor role in γ-tubulin recruitment to mitotic centrosome.","method":"Domain deletion analysis, co-immunoprecipitation, immunofluorescence, rescue experiments","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain deletion with rescue, co-IP for Cep192/pAurA interaction, multiple functional readouts; single lab","pmids":["33376154"],"is_preprint":false},{"year":2024,"finding":"Arl2 GTPase physically associates with Cdk5rap2 (validated by co-immunoprecipitation and proximity ligation assay). Arl2 knockdown reduces centrosomal microtubule growth and causes delocalization of Cdk5rap2 and γ-tubulin from centrosomes. Cdk5rap2 overexpression rescues neurogenesis defects caused by Arl2 knockdown, placing Cdk5rap2 downstream of Arl2 in cortical development.","method":"Co-immunoprecipitation, proximity ligation assay, RNAi knockdown, overexpression rescue, in vivo mouse cortical development assay","journal":"PLoS biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus proximity ligation for interaction, genetic epistasis via rescue experiment; single lab","pmids":["39137170"],"is_preprint":false},{"year":2025,"finding":"CDK5RAP2 is sufficient to form micron-scale scaffolds around a nanometer-scale nucleator in a PLK-1-regulated manner in vitro. CDK5RAP2 assemblies recruit and activate γTuRCs to generate microtubule asters. F75 in CDK5RAP2 is partially needed for γTuRC recruitment but indispensable for γTuRC activation. CDK5RAP2 scaffolds selectively recruit HSET/KifC1, which enhances α/β-tubulin concentration, microtubule polymerization, and clustering.","method":"In vitro reconstitution, mutagenesis (F75), microtubule aster formation assay, PLK1 regulation assay","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with mutagenesis establishing F75 as critical residue for activation; preprint, single lab but multiple orthogonal in vitro methods","pmids":["bio_10.1101_2025.02.20.639226"],"is_preprint":true},{"year":2025,"finding":"CEP215 (CDK5RAP2) exhibits a dynamically suppressed, solid-like state in interphase centrosomes that becomes more dynamic in mitosis. Interaction with PCNT is crucial for diffusible molecular dynamicity of CEP215. Truncation of CEP215 coiled-coil domains (CCDs) impairs cluster formation and causes spindle pole assembly and spindle formation defects.","method":"FRAP, light-inducible clustering assay, coiled-coil domain truncation mutagenesis, immunofluorescence","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRAP with functional consequence, mutagenesis of CCDs with spindle defects, light-inducible system; single lab","pmids":["40270183"],"is_preprint":false},{"year":2024,"finding":"CDK5RAP2 is required for male germ cell development via maintenance of Sertoli cell microtubule organization and blood-testis barrier (BTB) formation. Complete KO of Cep215 in mice results in arrested male germ cell development around the zygotene stage of meiosis and impaired BTB formation in testes.","method":"Conditional/complete knockout mouse model, histological analysis, immunofluorescence","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — complete KO mouse with histological and functional phenotypic analysis; single lab","pmids":["39569992"],"is_preprint":false},{"year":2020,"finding":"Cep215 is required for morphological differentiation of astrocytes. Cep215 localizes specifically at glial processes as well as centrosomes in developing astrocytes; its deletion suppresses morphological differentiation without affecting cell proliferation or specification. The microtubule-organizing function of Cep215 is critical for glial process formation.","method":"CRISPR KO (P19 cells), RNAi (embryonic hippocampal cultures), immunofluorescence","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO and RNAi in two model systems with defined cellular phenotype; single lab","pmids":["33046744"],"is_preprint":false},{"year":2024,"finding":"In the presence of both CDK5RAP2 and NEDD1, both factors can associate with the 'open' conformation of γ-TuRC simultaneously. NEDD1 does not induce conformational changes in γ-TuRC, while CDK5RAP2 interacts with GCP2 to induce conformational changes that promote microtubule nucleation.","method":"Cryo-EM structure of γ-TuRC bound simultaneously to NEDD1 and CDK5RAP2, biochemical pulldown mutants","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — cryo-EM structure with biochemical validation; preprint, single lab","pmids":["bio_10.1101_2024.11.05.622067"],"is_preprint":true},{"year":2024,"finding":"An alternative splice isoform of mouse CDK5RAP2 lacking exon 17 generates a truncated protein without a centrosomal localization signal that localizes diffusely in the cytoplasm. This isoform co-immunoprecipitates with γ-tubulin and MOZART2 and, when overexpressed, induces cytoplasmic microtubule nucleation during microtubule regrowth assays.","method":"Co-immunoprecipitation, microtubule regrowth assay, ectopic expression","journal":"IBRO neuroscience reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single co-IP and overexpression phenotype; single lab, limited mechanistic depth","pmids":["36164503"],"is_preprint":false}],"current_model":"CDK5RAP2 (CEP215) is a pericentriolar material scaffold protein that recruits and activates the γ-tubulin ring complex (γTuRC) at centrosomes and the Golgi via its CM1/γ-TuNA domain—which physically constricts the γ-TuRC toward nucleation-competent geometry—and associates with pericentrin, AKAP450, HSET, EB1, dynein-dynactin, Cep192, and phospho-Aurora A to link centrosomes to mitotic spindle poles, maintain centriole engagement and cohesion, regulate microtubule plus-end dynamics, control spindle checkpoint gene expression, and mediate downstream signaling through GSK3β/β-catenin/WIP1; its activity at centrosomes is cell-cycle-regulated by PLK1 (directly and via LRRK1-mediated Ser140 phosphorylation) and its centrosomal recruitment depends on dynein-dynactin-mediated transport."},"narrative":{"mechanistic_narrative":"CDK5RAP2 (CEP215) is a pericentriolar material (PCM) scaffold protein that organizes microtubule nucleation by recruiting and activating the γ-tubulin ring complex (γTuRC) at centrosomes and other microtubule-organizing centers [PMID:17959831, PMID:21135143]. It binds γTuRC through a short conserved γ-TuNA/CM1 motif that is required to attach γTuRC to the centrosome and that directly stimulates nucleation by purified γTuRC in vitro; cryo-EM of the reconstituted human complex shows that the CM1 motif binds multiple γTuRC modules (MZT2, GCP2) to drive long-range constriction of the γ-tubulin ring toward the 13-protofilament microtubule geometry, the structural basis of nucleation activation [PMID:21135143, PMID:39321808]. Beyond γTuRC, CDK5RAP2 tracks growing microtubule plus-ends through an EB1 interaction and regulates microtubule dynamics, stability, and bundling [PMID:19553473]. CDK5RAP2 is held at the centrosome largely through its interdependent interaction with pericentrin, with which it forms a matrix (also containing Cep68) required for centrosome maturation, bipolar spindle formation, and centriole engagement/cohesion that restricts centriole replication [PMID:18042621, PMID:20627074, PMID:25503564, PMID:24466316]. It links centrosomes to mitotic spindle poles via conserved CNN1/CNN2 domains and a mitosis-specific N-terminal domain that engages Cep192 and phospho-Aurora A, and binds the minus-end motor HSET/KIFC1 to cluster supernumerary centrosomes into pseudo-bipolar spindles [PMID:20368616, PMID:26987684, PMID:33376154]. The protein is delivered to and maintained at the centrosome by dynein-dynactin-mediated transport [PMID:20139723, PMID:23874654], and its centrosomal activity is cell-cycle-regulated by PLK1, both directly and through LRRK1-mediated Ser140 phosphorylation within the γ-tubulin-binding motif that enhances γ-tubulin binding and spindle orientation [PMID:25503564, PMID:26192437, PMID:33170211]. In addition to its cytoskeletal roles, CDK5RAP2 acts as a nuclear transcriptional regulator of spindle-checkpoint genes (BUBR1, MAD2) and CENP-A, with loss producing chromosome mis-segregation [PMID:19282672, PMID:33725591]. Loss of CDK5RAP2 in mice causes microcephaly through premature neural progenitor cell-cycle exit, apoptosis, and spindle defects, establishing its role in neurogenesis [PMID:20471352, PMID:20460369].","teleology":[{"year":2007,"claim":"Established that CDK5RAP2 is a PCM-resident protein that anchors γTuRC to the centrosome, defining its core role in centrosomal microtubule nucleation.","evidence":"Co-IP, RNAi, and microtubule nucleation assays in cultured cells","pmids":["17959831"],"confidence":"High","gaps":["Did not resolve whether binding directly activates nucleation versus only tethering γTuRC","Mechanism of the conserved γTuRC-binding sequence not structurally defined"]},{"year":2007,"claim":"Showed CDK5RAP2 maintains interphase centrosome cohesion through a pericentrin-linked mechanism distinct from rootletin/Cep68 fibers.","evidence":"RNAi, immunofluorescence, and co-IP for pericentrin in cultured cells","pmids":["18042621"],"confidence":"Medium","gaps":["Molecular nature of the cohesion mechanism left vague","Single lab"]},{"year":2010,"claim":"Defined the γ-TuNA domain as a direct activator of γTuRC nucleation and mapped its association with NME7, FAM128A/B, and actin, distinguishing activation from γTuRC assembly.","evidence":"In vitro nucleation with purified γTuRC, mutagenesis, and RNAi","pmids":["21135143"],"confidence":"High","gaps":["Structural basis of activation not determined at this stage","Role of NME7/FAM128 in activation unresolved"]},{"year":2010,"claim":"Identified an EB1-binding motif enabling CDK5RAP2 to track microtubule plus-ends and regulate dynamics, extending its role beyond minus-end nucleation.","evidence":"Co-IP, Ile/Leu-Pro dipeptide mutagenesis, live imaging, and in vitro assembly assays","pmids":["19553473"],"confidence":"High","gaps":["How plus-end and minus-end activities are coordinated in cells unknown"]},{"year":2010,"claim":"Mapped a CM2-like motif mediating pericentrin/AKAP450 binding that targets CDK5RAP2 to both centrosomes and Golgi, with calmodulin binding dispensable.","evidence":"Mutational analysis, co-IP, and subcellular fractionation","pmids":["20466722"],"confidence":"Medium","gaps":["Functional role of the Golgi pool not established","Single lab"]},{"year":2010,"claim":"Defined conserved CNN1/CNN2 domains that recruit PCM for centrosome-spindle pole attachment and link CDK5RAP2 to centriole cohesion and the G2 DNA-damage checkpoint.","evidence":"Domain deletion and gene disruption in DT40 cells with multiple phenotypic readouts","pmids":["20368616"],"confidence":"High","gaps":["Direct PCM components recruited by CNN1 not all identified","Mechanistic link to DNA-damage arrest unclear"]},{"year":2010,"claim":"Established CDK5RAP2-pericentrin interdependence in neural progenitors and that its loss drives premature differentiation, connecting centrosome function to neurogenesis.","evidence":"Reciprocal RNAi phenocopy, co-IP, and cell-cycle analysis in neural progenitors","pmids":["20471352"],"confidence":"High","gaps":["How spindle/centrosome defects translate to fate decisions not fully resolved"]},{"year":2010,"claim":"Demonstrated in vivo that Cdk5rap2 loss causes microcephaly via progenitor cell-cycle exit, apoptosis, and spindle abnormalities, and that it restricts centriole amplification.","evidence":"Mouse mutant/KO models with EM, BrdU labeling, and spindle/cilia analysis","pmids":["20460369","20627074"],"confidence":"High","gaps":["Relative contributions of cohesion versus nucleation defects to microcephaly unresolved"]},{"year":2010,"claim":"Showed CDK5RAP2 centrosomal localization depends on dynein-dynactin and that it is in turn required for centrosomal dynein, defining bidirectional transport coupling.","evidence":"RNAi, live imaging, and dynein-dynactin perturbation","pmids":["20139723"],"confidence":"Medium","gaps":["Direct versus indirect dynein dependency not separated","Single lab"]},{"year":2013,"claim":"Demonstrated dynamic, microtubule-dependent centrosomal turnover of CDK5RAP2 via a dynein light chain 8-binding motif.","evidence":"FRAP, co-IP, and dominant-negative dynein-dynactin disruption","pmids":["23874654"],"confidence":"Medium","gaps":["Functional consequence of turnover dynamics not established","Single lab"]},{"year":2014,"claim":"Placed CDK5RAP2 in a PLK1-regulated proteolytic circuit (Cep68/SCF-βTrCP, PCNT cleavage) controlling its removal from PCM to govern centriole disengagement and duplication.","evidence":"Co-IP, mass spectrometry, degradation assays, and phospho-site mutagenesis","pmids":["25503564"],"confidence":"High","gaps":["How peripheral versus core PCM pools are differentially regulated mechanistically unclear"]},{"year":2014,"claim":"Showed CDK5RAP2-pericentrin interdependence drives centrosome maturation and bipolar spindle formation, with γ-tubulin binding dispensable for maturation itself.","evidence":"Knockdown-rescue with domain mutants and immunofluorescence","pmids":["24466316"],"confidence":"Medium","gaps":["Separating maturation scaffolding from nucleation function incompletely resolved","Single lab"]},{"year":2015,"claim":"Identified a PLK1>LRRK1>CDK5RAP2 Ser140 phosphorylation cascade that enhances γ-tubulin binding and regulates spindle orientation, linking mitotic kinase signaling to nucleation.","evidence":"In vitro kinase assay, phospho-site mutagenesis, co-IP, and spindle orientation assays","pmids":["26192437"],"confidence":"High","gaps":["Whether other kinases redundantly target the γ-tubulin-binding motif unknown"]},{"year":2016,"claim":"Established direct CDK5RAP2-HSET/KIFC1 binding that clusters supernumerary centrosomes into pseudo-bipolar spindles in cancer cells.","evidence":"Proteomics, co-IP, domain deletion, and patient-derived cell validation","pmids":["26987684"],"confidence":"High","gaps":["Whether this clustering function is druggable in vivo not addressed"]},{"year":2016,"claim":"Defined functional redundancy between CDK5RAP2 and ASPM in spindle pole focusing that is independent of HSET localization and γ-tubulin activation.","evidence":"CRISPR KO, auxin-inducible degron, RNAi, and immunofluorescence","pmids":["28883092"],"confidence":"High","gaps":["Molecular basis of the pole-focusing activity unidentified"]},{"year":2009,"claim":"Revealed an unexpected nuclear transcriptional role for CDK5RAP2 in regulating spindle-checkpoint genes BUBR1 and MAD2.","evidence":"RNAi, ChIP at promoters, and immunoblotting","pmids":["19282672"],"confidence":"Medium","gaps":["How a centrosomal scaffold acts as a transcriptional regulator unexplained","Single lab"]},{"year":2020,"claim":"Demonstrated the PCNT-CDK5RAP2 matrix becomes essential for acentriolar spindle assembly via a microtubule- and PLK1-dependent process requiring γ-tubulin recruitment.","evidence":"Centrinone-induced centriole loss, CRISPR KO of PCNT and CDK5RAP2, and live imaging","pmids":["33170211"],"confidence":"High","gaps":["Trigger that switches matrix assembly to essential mode unclear"]},{"year":2020,"claim":"Showed CEP215 localizes to oocyte acentriolar MTOCs in a pericentrin-dependent, Aurora A-sensitive manner and regulates meiotic spindle pole focusing without affecting γ-tubulin recruitment.","evidence":"siRNA, Aurora A inhibition, and super-resolution microscopy in mouse oocytes","pmids":["31895686"],"confidence":"Medium","gaps":["Why γ-tubulin recruitment is uncoupled in oocytes unexplained","Single lab"]},{"year":2021,"claim":"Connected CDK5RAP2 to cellular senescence via a GSK3β/β-catenin/WIP1 axis through direct GSK3β binding and inhibitory Ser9 phosphorylation.","evidence":"Co-IP, phospho-immunoblotting, and knockdown-rescue with ectopic WIP1","pmids":["34930892"],"confidence":"Medium","gaps":["Whether this signaling is centrosome-dependent unknown","Single lab"]},{"year":2021,"claim":"Identified CDK5RAP2 as a positive transcriptional regulator of CENP-A whose loss causes chromosome segregation errors.","evidence":"RNAi, ChIP at the CENP-A promoter, and ectopic CENP-A rescue","pmids":["33725591"],"confidence":"Medium","gaps":["Mechanism of promoter engagement unresolved","Single lab"]},{"year":2024,"claim":"Provided the structural mechanism of nucleation activation: CM1 binds multiple γTuRC modules to constrict the γ-tubulin ring toward microtubule geometry.","evidence":"Cryo-EM of reconstituted human γTuRC and single-molecule nucleation assays","pmids":["39321808"],"confidence":"High","gaps":["How constriction is regulated by phosphorylation/partners in cells not shown"]},{"year":2024,"claim":"Placed CDK5RAP2 downstream of the Arl2 GTPase in centrosomal microtubule growth and cortical neurogenesis.","evidence":"Co-IP, proximity ligation, RNAi, and overexpression rescue in mouse cortex","pmids":["39137170"],"confidence":"Medium","gaps":["Whether Arl2 regulates CDK5RAP2 localization directly unclear","Single lab"]},{"year":2025,"claim":"Showed CDK5RAP2 self-assembles into micron-scale, PLK-1-regulated scaffolds that recruit/activate γTuRC and HSET to build microtubule asters, with F75 dispensable for recruitment but essential for activation.","evidence":"In vitro reconstitution, F75 mutagenesis, and aster formation assays (preprint)","pmids":["bio_10.1101_2025.02.20.639226"],"confidence":"High","gaps":["Preprint, single lab","Whether scaffold self-assembly occurs identically in cells unverified"]},{"year":2025,"claim":"Revealed cell-cycle-dependent material-state switching of CEP215 at centrosomes, with pericentrin and coiled-coil domains governing dynamicity and spindle pole assembly.","evidence":"FRAP, light-inducible clustering, and coiled-coil truncation mutagenesis","pmids":["40270183"],"confidence":"Medium","gaps":["Molecular driver of the solid-to-dynamic transition unclear","Single lab"]},{"year":null,"claim":"How CDK5RAP2's distinct activities—centrosomal scaffolding, γTuRC activation, plus-end tracking, and nuclear transcriptional regulation—are integrated and spatially partitioned within one protein remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Mechanism connecting cytoplasmic scaffolding to promoter-level transcriptional control unknown","Coordination of multiple binding motifs across the cell cycle undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,22,27]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,4,14]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[6,11,25]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[15,20]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[0,2,5]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[3]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[4]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[15,20]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[5,11,16]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,1,12]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[7,8,30]}],"complexes":["γ-tubulin ring complex (γTuRC)","PCNT-CDK5RAP2 pericentriolar matrix","CEP215-Cep68-PCNT complex"],"partners":["PCNT","EB1","HSET/KIFC1","CEP192","GSK3B","CEP68","AKAP450","NEDD1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96SN8","full_name":"CDK5 regulatory subunit-associated protein 2","aliases":["CDK5 activator-binding protein C48","Centrosome-associated protein 215"],"length_aa":1893,"mass_kda":215.0,"function":"Potential regulator of CDK5 activity via its interaction with CDK5R1 (PubMed:15164053). Negative regulator of centriole disengagement (licensing) which maintains centriole engagement and cohesion. Involved in regulation of mitotic spindle orientation (By similarity). Plays a role in the spindle checkpoint activation by acting as a transcriptional regulator of both BUBR1 and MAD2 promoter (PubMed:19282672). Together with EB1/MAPRE1, may promote microtubule polymerization, bundle formation, growth and dynamics at the plus ends (PubMed:18042621, PubMed:17959831, PubMed:19553473). Regulates centrosomal maturation by recruitment of the gamma-tubulin ring complex (gTuRC) onto centrosomes (PubMed:18042621, PubMed:17959831, PubMed:26485573, PubMed:39321809). In complex with PDE4DIP isoform 13/MMG8/SMYLE, MAPRE1 and AKAP9, contributes to microtubules nucleation and extension from the centrosome to the cell periphery (PubMed:29162697). Required for the recruitment of AKAP9 to centrosomes (PubMed:29162697). Plays a role in neurogenesis (By similarity)","subcellular_location":"Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Golgi apparatus; Cytoplasm; Cytoplasm, cytoskeleton","url":"https://www.uniprot.org/uniprotkb/Q96SN8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CDK5RAP2","classification":"Not Classified","n_dependent_lines":58,"n_total_lines":1208,"dependency_fraction":0.048013245033112585},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CALM1","stoichiometry":0.2},{"gene":"DYNLL1","stoichiometry":0.2},{"gene":"DYNLL2","stoichiometry":0.2},{"gene":"MIF","stoichiometry":0.2},{"gene":"PRKACA","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/CDK5RAP2","total_profiled":1310},"omim":[{"mim_id":"616889","title":"CENTROSOMAL PROTEIN, 68-KD; CEP68","url":"https://www.omim.org/entry/616889"},{"mim_id":"615776","title":"CILIARY ROOTLET COILED-COIL PROTEIN; CROCC","url":"https://www.omim.org/entry/615776"},{"mim_id":"613529","title":"CENTROSOMAL PROTEIN, 152-KD; CEP152","url":"https://www.omim.org/entry/613529"},{"mim_id":"609689","title":"CENTROSOMAL PROTEIN, 250-KD; CEP250","url":"https://www.omim.org/entry/609689"},{"mim_id":"609279","title":"CENTROMERIC PROTEIN J; CENPJ","url":"https://www.omim.org/entry/609279"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Centrosome","reliability":"Supported"},{"location":"Basal body","reliability":"Supported"},{"location":"Cell Junctions","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"},{"location":"Equatorial segment","reliability":"Additional"},{"location":"Mid piece","reliability":"Additional"},{"location":"Principal piece","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CDK5RAP2"},"hgnc":{"alias_symbol":["C48","FLJ10867","CEP215"],"prev_symbol":["MCPH3"]},"alphafold":{"accession":"Q96SN8","domains":[{"cath_id":"1.20.5","chopping":"62-189","consensus_level":"medium","plddt":83.5073,"start":62,"end":189}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96SN8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96SN8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96SN8-F1-predicted_aligned_error_v6.png","plddt_mean":59.09},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CDK5RAP2","jax_strain_url":"https://www.jax.org/strain/search?query=CDK5RAP2"},"sequence":{"accession":"Q96SN8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96SN8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96SN8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96SN8"}},"corpus_meta":[{"pmid":"15793586","id":"PMC_15793586","title":"A 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This binding is required for γTuRC attachment to the centrosome (but not γTuRC assembly), and perturbing CDK5RAP2 function delocalizes γ-tubulin from centrosomes and inhibits centrosomal microtubule nucleation, leading to disorganized interphase microtubule arrays and anastral mitotic spindles.\",\n      \"method\": \"Co-immunoprecipitation, overexpression, RNAi knockdown, immunofluorescence, microtubule nucleation assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, RNAi loss-of-function with defined cellular phenotypes, replicated across multiple studies\",\n      \"pmids\": [\"17959831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CDK5RAP2 contains a γ-TuRC-mediated nucleation activator (γ-TuNA) domain that directly stimulates microtubule nucleation by purified γTuRC in vitro. γ-TuNA associates with γTuRC containing NME7, FAM128A/B, and actin in addition to γ-tubulin and GCP2-6. RNAi depletion of CDK5RAP2 impairs both centrosomal and acentrosomal microtubule nucleation without affecting γTuRC assembly.\",\n      \"method\": \"In vitro microtubule nucleation assay with purified γTuRC, co-immunoprecipitation, RNAi, microtubule regrowth assay, active-site/binding-domain mutagenesis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified components, mutagenesis of binding domain, and RNAi functional validation; replicated concept across multiple labs\",\n      \"pmids\": [\"21135143\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CDK5RAP2 (Cep215) is required for centrosome cohesion during interphase. Unlike rootletin/Cep68 which form centriole-associated fibres, Cep215 associates with centrosomes throughout the cell cycle and functionally interacts with pericentrin to influence centrosome cohesion through a mechanism related to cytoskeletal dynamics.\",\n      \"method\": \"RNAi knockdown, immunofluorescence, co-immunoprecipitation, overexpression\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi with defined centrosome cohesion phenotype, co-IP for pericentrin interaction; single lab\",\n      \"pmids\": [\"18042621\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CDK5RAP2 localizes to the Golgi complex in an ATP- and centrosome-dependent manner and associates with Golgi membranes independently of microtubules. A CM2-like motif in CDK5RAP2 is essential for centrosomal and Golgi localization by mediating binding to pericentrin (required for both centrosomal and Golgi localization) and AKAP450 (required for Golgi localization). Calmodulin binding to this motif is dispensable for centrosomal and Golgi association.\",\n      \"method\": \"Mutational analysis, co-immunoprecipitation, immunofluorescence, subcellular fractionation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutational approach with defined functional readouts, co-IP for binding partners; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"20466722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CDK5RAP2 interacts with EB1 via a conserved basic and Ser-rich motif containing an Ile/Leu-Pro dipeptide, enabling CDK5RAP2 to track growing microtubule plus-ends. Mutation of the Ile/Leu-Pro dipeptide abolishes EB1 interaction and plus-end attachment. The CDK5RAP2-EB1 complex regulates microtubule dynamics, stability, and bundling; CDK5RAP2 depletion impairs microtubule dynamic behaviors, and the complex stimulates microtubule assembly and bundle formation in vitro.\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis, live cell imaging, RNAi, in vitro microtubule assembly assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution, mutagenesis abolishing EB1 interaction, live imaging, RNAi phenotype; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"19553473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CDK5RAP2 loss-of-function in mice causes centriole amplification with a preponderance of unpaired single centrioles and daughter-daughter centriole pairs, indicating CDK5RAP2 is required to maintain centriole engagement and cohesion to restrict centriole replication. Early in mitosis, amplified centrosomes assemble multipolar spindles. Excess mother centrioles also template multiple primary cilia.\",\n      \"method\": \"Mouse knockout model (Cdk5rap2 mutant), electron microscopy, immunofluorescence, cilia analysis\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo mouse KO with ultrastructural analysis, multiple independent phenotypic readouts; replicated concept across labs\",\n      \"pmids\": [\"20627074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CDK5RAP2 links centrosomes to mitotic spindle poles via two evolutionarily conserved domains, CNN1 and CNN2, in vertebrate cells. The CNN1 domain is required for recruiting specific PCM components that mediate centrosome-spindle pole attachment, and also enforces centriole cohesion during interphase and promotes efficient DNA damage-induced G2 cell cycle arrest.\",\n      \"method\": \"Domain deletion mutagenesis, gene disruption in DT40 cells, immunofluorescence, DNA damage response assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — domain-specific mutagenesis in vertebrate cells, multiple phenotypic readouts (spindle pole attachment, centriole cohesion, DNA damage checkpoint); rigorous epistatic analysis\",\n      \"pmids\": [\"20368616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Cdk5rap2 interacts with pericentrin in neural progenitor cells, and loss of Cdk5rap2 depletes apical progenitors and increases cell-cycle exit leading to premature neuronal differentiation. Depletion of pericentrin phenocopies Cdk5rap2 knockdown and results in decreased Cdk5rap2 recruitment to the centrosome, establishing a functional epistatic relationship.\",\n      \"method\": \"RNAi knockdown in neural progenitors, co-immunoprecipitation, immunofluorescence, cell cycle analysis\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal knockdowns with phenocopy, co-IP for interaction, defined cellular phenotype in neurogenesis; replicated with mouse model\",\n      \"pmids\": [\"20471352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Cdk5rap2 mouse mutants exhibit microcephaly resulting from neurogenic defects including premature cell cycle exit and apoptosis of neuronal progenitors, associated with impaired mitotic progression, abnormal spindle pole number, and abnormal mitotic orientation. The an mutation is a genomic inversion causing an in-frame deletion of exon 4.\",\n      \"method\": \"Mouse mutant model (Hertwig's anemia an/an), BrdU/EdU labeling, immunofluorescence, spindle pole analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo mouse model with defined molecular lesion, multiple orthogonal readouts of neurogenesis, spindle, and apoptosis\",\n      \"pmids\": [\"20460369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CEP215 (CDK5RAP2) is involved in dynein-dependent accumulation of pericentriolar matrix proteins for spindle pole formation. Knockdown of CEP215 results in monopolar spindle formation, decreased inter-pole distance, and centrosome detachment from spindle poles. CEP215 is critical for centrosomal localization of dynein throughout the cell cycle, and its own centrosomal localization depends on the dynein-dynactin complex.\",\n      \"method\": \"RNAi knockdown, immunofluorescence, live cell imaging\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi with multiple cellular phenotype readouts, dynein dependency demonstrated; single lab\",\n      \"pmids\": [\"20139723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CDK5RAP2 displays highly dynamic attachment to centrosomes in a microtubule-dependent manner. CDK5RAP2 associates with the retrograde transporter dynein-dynactin and contains a sequence motif that binds dynein light chain 8. Disruption of dynein-dynactin function reduces centrosomal CDK5RAP2 levels.\",\n      \"method\": \"FRAP (live cell imaging), co-immunoprecipitation, dominant-negative dynein-dynactin disruption\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRAP with functional consequence, co-IP for dynein interaction, dominant-negative perturbation; single lab\",\n      \"pmids\": [\"23874654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CEP215 (CDK5RAP2) forms a complex with Cep68 and PCNT (pericentrin). Cep68 degradation via SCF(βTrCP) (initiated by PLK1 phosphorylation at Ser332) allows CEP215 removal from the peripheral PCM to prevent centriole separation following disengagement, while PCNT cleavage mediates CEP215 removal from the core PCM to inhibit centriole disengagement and duplication.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, protein degradation assays, phospho-site mutagenesis\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP establishing complex, mass spectrometry, PLK1 phospho-site mutagenesis, proteolysis assays; multiple orthogonal methods\",\n      \"pmids\": [\"25503564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CEP215 and pericentrin are interdependent for their accumulation at spindle poles during mitosis. The CEP215-pericentrin interaction is required for centrosome maturation and subsequent bipolar spindle formation during mitosis. CEP215 interaction with γ-tubulin is dispensable for centrosome maturation.\",\n      \"method\": \"RNAi knockdown-rescue experiments with domain mutants, immunofluorescence\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockdown-rescue with domain mutants, multiple functional readouts; single lab\",\n      \"pmids\": [\"24466316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"LRRK1, activated by PLK1 phosphorylation at Ser1790, phosphorylates CDK5RAP2 at Ser140 within its γ-tubulin-binding motif. This phosphorylation promotes CDK5RAP2-γ-tubulin interaction and CDK5RAP2-dependent microtubule nucleation from centrosomes, thereby regulating mitotic spindle orientation.\",\n      \"method\": \"In vitro kinase assay, phospho-site mutagenesis, co-immunoprecipitation, immunofluorescence, spindle orientation assay\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay, phospho-site mutagenesis, co-IP for interaction, multiple orthogonal functional readouts\",\n      \"pmids\": [\"26192437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CEP215 directly binds the minus-end-directed microtubule motor HSET (KIFC1). Targeted deletion of the HSET-binding domain of CEP215 causes centrosome detachment and HSET depletion at centrosomes. The CEP215-HSET complex promotes clustering of extra centrosomes into pseudo-bipolar spindles in cancer cells with centrosome amplification.\",\n      \"method\": \"Proteomic profiling, co-immunoprecipitation, targeted domain deletion in vertebrate cells, immunofluorescence\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — proteomic identification plus co-IP, domain deletion with defined phenotype, patient-derived cell validation\",\n      \"pmids\": [\"26987684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CDK5RAP2 is required for spindle checkpoint function. CDK5RAP2 knockdown causes chromosome mis-segregation, fails to maintain the spindle checkpoint, reduces expression of spindle checkpoint proteins BUBR1 and MAD2, and increases chromatin-associated CDC20. CDK5RAP2 resides on BUBR1 and MAD2 promoters and regulates their transcription.\",\n      \"method\": \"RNAi knockdown, chromatin immunoprecipitation (ChIP), flow cytometry, immunoblotting\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for promoter binding, RNAi with defined spindle checkpoint phenotype; single lab, two orthogonal methods\",\n      \"pmids\": [\"19282672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ASPM functions redundantly with CDK5RAP2 in spindle pole organization during mitotic metaphase in human cells. Depletion of CDK5RAP2 in ASPM knockout cells causes spindle pole unfocusing and delayed anaphase onset. The pole-focusing function of CDK5RAP2 is independent of its known role to localize HSET or to activate the γ-tubulin complex.\",\n      \"method\": \"CRISPR-based gene knockout, auxin-inducible degron, RNAi, immunofluorescence\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR KO combined with auxin-inducible degron system, genetic epistasis, multiple functional readouts\",\n      \"pmids\": [\"28883092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The PCNT-CDK5RAP2 pericentriolar matrix becomes essential for mitotic spindle assembly when centrioles are absent. In acentriolar cells, PCNT and CDK5RAP2 form foci via a microtubule- and PLK1-dependent process. Foci formation and spindle assembly require PCNT-CDK5RAP2-dependent matrix assembly and the ability of CDK5RAP2 to recruit γ-tubulin complexes.\",\n      \"method\": \"Centriole inhibition (centrinone), CRISPR KO of PCNT and CDK5RAP2, immunofluorescence, live cell imaging\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis using multiple KO combinations, multiple orthogonal methods, tested in multiple cell lines\",\n      \"pmids\": [\"33170211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CEP215 (CDK5RAP2) localizes to acentriolar MTOCs (aMTOCs) in mouse oocytes in a pericentrin-dependent manner and participates in regulation of meiotic spindle pole focusing. Aurora Kinase A inhibition causes striking loss of the ring-like aMTOC organization and pronounced CEP215 clustering. Unlike in mitotic cells, CEP215 depletion in oocytes does not reduce γ-tubulin at aMTOCs.\",\n      \"method\": \"siRNA knockdown, Aurora Kinase A inhibition, super-resolution microscopy, immunofluorescence\",\n      \"journal\": \"Reproduction (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with defined spindle phenotype, super-resolution imaging, pharmacological inhibition; single lab\",\n      \"pmids\": [\"31895686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Loss of CDK5RAP2 causes premature cell senescence through a GSK3β/β-catenin/WIP1 pathway. CDK5RAP2 interacts with GSK3β and causes inhibitory Ser9 phosphorylation of GSK3β. Loss of CDK5RAP2 increases GSK3β activity, reducing nuclear β-catenin and thereby downregulating the NF-κB target gene WIP1, which leads to elevated p53 Ser15 phosphorylation and senescence. Ectopic WIP1 expression reverses the senescent phenotype.\",\n      \"method\": \"RNAi knockdown, co-immunoprecipitation, phospho-immunoblotting, rescue experiments with ectopic expression\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP for CDK5RAP2-GSK3β interaction, knockdown-rescue, pathway epistasis via GSK3β inhibition; single lab\",\n      \"pmids\": [\"34930892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CDK5RAP2 functions as a positive transcriptional regulator of CENP-A. CDK5RAP2 is present in the nucleus, interacts with the CENP-A promoter, and upregulates CENP-A transcription. Loss of CDK5RAP2 reduces centromeric CENP-A levels and causes lagging chromosomes, micronuclei, and chromatin bridges. Exogenous CENP-A expression partially rescues lagging chromosomes in CDK5RAP2 knockdown cells.\",\n      \"method\": \"RNAi knockdown, chromatin immunoprecipitation (ChIP), ectopic expression rescue, immunofluorescence\",\n      \"journal\": \"Biomedicine & pharmacotherapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP establishes promoter binding, knockdown-rescue epistasis; single lab\",\n      \"pmids\": [\"33725591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Pathogenic LRRK2 causes centrosomal displacement of CDK5RAP2 via a mechanism requiring Rab protein phosphorylation by LRRK2 and RILPL1. The pathogenic LRRK2-mediated centrosomal cohesion deficits are dependent on both the GTP conformation and phosphorylation status of Rab proteins. CDK5RAP2 displacement by LRRK2 does not involve displacement of proteinaceous linker proteins but specifically requires phospho-Rab/RILPL1 centrosomal association.\",\n      \"method\": \"iPSC-derived cells from patients, transiently transfected cell lines, immunofluorescence, LRRK2 kinase inhibition\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient-derived iPSC validation plus mechanistic cell line experiments, pharmacological and genetic perturbations; single lab\",\n      \"pmids\": [\"35721463\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CDK5RAP2's centrosomin motif 1 (CM1) induces partial closure of the γ-TuRC by binding multiple modules containing MZT2, GCP2, and CDK5RAP2, resulting in long-range constriction of the γ-tubulin ring toward the geometry of 13-protofilament microtubules. Additional CDK5RAP2 promotes γ-TuRC decoration and stimulates microtubule-nucleating activities in single-molecule assays.\",\n      \"method\": \"Cryo-EM structure determination, in vitro single-molecule microtubule nucleation assay, reconstituted human γ-TuRC\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure with in vitro functional validation using reconstituted complex and single-molecule assays\",\n      \"pmids\": [\"39321808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CDK5RAP2 interacts with Hippo signaling pathway components MST1 kinase and the transcriptional regulator TAZ. In patient fibroblasts with CDK5RAP2 mutations, higher levels of TAZ and YAP are observed, but common Hippo target genes are downregulated while BIRC5 (Survivin) is upregulated.\",\n      \"method\": \"Co-immunoprecipitation, patient-derived fibroblasts, immunoblotting\",\n      \"journal\": \"Molecular genetics and genomics : MGG\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single co-IP for MST1/TAZ interaction, no functional validation of direct mechanism; single lab, single method\",\n      \"pmids\": [\"28004182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Cep169 is a novel centrosomal protein that directly interacts with CDK5RAP2 through CM1, an evolutionarily conserved domain, and colocalizes with CDK5RAP2 at the PCM and at microtubule plus-ends via EB1. Cep169 regulates microtubule stability; its depletion induces microtubule depolymerization but it is not required for γ-tubulin assembly at centrosomes by CDK5RAP2.\",\n      \"method\": \"Co-immunoprecipitation, RNAi knockdown, immunofluorescence, EB1-binding domain mutagenesis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP for direct interaction, domain mutagenesis, RNAi phenotype; single lab\",\n      \"pmids\": [\"26485573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"A mitosis-specific centrosome-targeting domain of Cep215 (215N) interacts with Cep192 and phosphorylated Aurora A (pAurA), with Cep192 being essential for targeting 215N to centrosomes and centrosomal localization of 215N and pAurA being mutually dependent. Rescue experiments show Cep215 maintains structural integrity of spindle poles by providing a platform for centrosome maturation molecules, with relatively minor role in γ-tubulin recruitment to mitotic centrosome.\",\n      \"method\": \"Domain deletion analysis, co-immunoprecipitation, immunofluorescence, rescue experiments\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain deletion with rescue, co-IP for Cep192/pAurA interaction, multiple functional readouts; single lab\",\n      \"pmids\": [\"33376154\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Arl2 GTPase physically associates with Cdk5rap2 (validated by co-immunoprecipitation and proximity ligation assay). Arl2 knockdown reduces centrosomal microtubule growth and causes delocalization of Cdk5rap2 and γ-tubulin from centrosomes. Cdk5rap2 overexpression rescues neurogenesis defects caused by Arl2 knockdown, placing Cdk5rap2 downstream of Arl2 in cortical development.\",\n      \"method\": \"Co-immunoprecipitation, proximity ligation assay, RNAi knockdown, overexpression rescue, in vivo mouse cortical development assay\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus proximity ligation for interaction, genetic epistasis via rescue experiment; single lab\",\n      \"pmids\": [\"39137170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CDK5RAP2 is sufficient to form micron-scale scaffolds around a nanometer-scale nucleator in a PLK-1-regulated manner in vitro. CDK5RAP2 assemblies recruit and activate γTuRCs to generate microtubule asters. F75 in CDK5RAP2 is partially needed for γTuRC recruitment but indispensable for γTuRC activation. CDK5RAP2 scaffolds selectively recruit HSET/KifC1, which enhances α/β-tubulin concentration, microtubule polymerization, and clustering.\",\n      \"method\": \"In vitro reconstitution, mutagenesis (F75), microtubule aster formation assay, PLK1 regulation assay\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with mutagenesis establishing F75 as critical residue for activation; preprint, single lab but multiple orthogonal in vitro methods\",\n      \"pmids\": [\"bio_10.1101_2025.02.20.639226\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CEP215 (CDK5RAP2) exhibits a dynamically suppressed, solid-like state in interphase centrosomes that becomes more dynamic in mitosis. Interaction with PCNT is crucial for diffusible molecular dynamicity of CEP215. Truncation of CEP215 coiled-coil domains (CCDs) impairs cluster formation and causes spindle pole assembly and spindle formation defects.\",\n      \"method\": \"FRAP, light-inducible clustering assay, coiled-coil domain truncation mutagenesis, immunofluorescence\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRAP with functional consequence, mutagenesis of CCDs with spindle defects, light-inducible system; single lab\",\n      \"pmids\": [\"40270183\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CDK5RAP2 is required for male germ cell development via maintenance of Sertoli cell microtubule organization and blood-testis barrier (BTB) formation. Complete KO of Cep215 in mice results in arrested male germ cell development around the zygotene stage of meiosis and impaired BTB formation in testes.\",\n      \"method\": \"Conditional/complete knockout mouse model, histological analysis, immunofluorescence\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — complete KO mouse with histological and functional phenotypic analysis; single lab\",\n      \"pmids\": [\"39569992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Cep215 is required for morphological differentiation of astrocytes. Cep215 localizes specifically at glial processes as well as centrosomes in developing astrocytes; its deletion suppresses morphological differentiation without affecting cell proliferation or specification. The microtubule-organizing function of Cep215 is critical for glial process formation.\",\n      \"method\": \"CRISPR KO (P19 cells), RNAi (embryonic hippocampal cultures), immunofluorescence\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO and RNAi in two model systems with defined cellular phenotype; single lab\",\n      \"pmids\": [\"33046744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In the presence of both CDK5RAP2 and NEDD1, both factors can associate with the 'open' conformation of γ-TuRC simultaneously. NEDD1 does not induce conformational changes in γ-TuRC, while CDK5RAP2 interacts with GCP2 to induce conformational changes that promote microtubule nucleation.\",\n      \"method\": \"Cryo-EM structure of γ-TuRC bound simultaneously to NEDD1 and CDK5RAP2, biochemical pulldown mutants\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — cryo-EM structure with biochemical validation; preprint, single lab\",\n      \"pmids\": [\"bio_10.1101_2024.11.05.622067\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"An alternative splice isoform of mouse CDK5RAP2 lacking exon 17 generates a truncated protein without a centrosomal localization signal that localizes diffusely in the cytoplasm. This isoform co-immunoprecipitates with γ-tubulin and MOZART2 and, when overexpressed, induces cytoplasmic microtubule nucleation during microtubule regrowth assays.\",\n      \"method\": \"Co-immunoprecipitation, microtubule regrowth assay, ectopic expression\",\n      \"journal\": \"IBRO neuroscience reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single co-IP and overexpression phenotype; single lab, limited mechanistic depth\",\n      \"pmids\": [\"36164503\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CDK5RAP2 (CEP215) is a pericentriolar material scaffold protein that recruits and activates the γ-tubulin ring complex (γTuRC) at centrosomes and the Golgi via its CM1/γ-TuNA domain—which physically constricts the γ-TuRC toward nucleation-competent geometry—and associates with pericentrin, AKAP450, HSET, EB1, dynein-dynactin, Cep192, and phospho-Aurora A to link centrosomes to mitotic spindle poles, maintain centriole engagement and cohesion, regulate microtubule plus-end dynamics, control spindle checkpoint gene expression, and mediate downstream signaling through GSK3β/β-catenin/WIP1; its activity at centrosomes is cell-cycle-regulated by PLK1 (directly and via LRRK1-mediated Ser140 phosphorylation) and its centrosomal recruitment depends on dynein-dynactin-mediated transport.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CDK5RAP2 (CEP215) is a pericentriolar material (PCM) scaffold protein that organizes microtubule nucleation by recruiting and activating the γ-tubulin ring complex (γTuRC) at centrosomes and other microtubule-organizing centers [#0, #1]. It binds γTuRC through a short conserved γ-TuNA/CM1 motif that is required to attach γTuRC to the centrosome and that directly stimulates nucleation by purified γTuRC in vitro; cryo-EM of the reconstituted human complex shows that the CM1 motif binds multiple γTuRC modules (MZT2, GCP2) to drive long-range constriction of the γ-tubulin ring toward the 13-protofilament microtubule geometry, the structural basis of nucleation activation [#1, #22]. Beyond γTuRC, CDK5RAP2 tracks growing microtubule plus-ends through an EB1 interaction and regulates microtubule dynamics, stability, and bundling [#4]. CDK5RAP2 is held at the centrosome largely through its interdependent interaction with pericentrin, with which it forms a matrix (also containing Cep68) required for centrosome maturation, bipolar spindle formation, and centriole engagement/cohesion that restricts centriole replication [#2, #5, #11, #12]. It links centrosomes to mitotic spindle poles via conserved CNN1/CNN2 domains and a mitosis-specific N-terminal domain that engages Cep192 and phospho-Aurora A, and binds the minus-end motor HSET/KIFC1 to cluster supernumerary centrosomes into pseudo-bipolar spindles [#6, #14, #25]. The protein is delivered to and maintained at the centrosome by dynein-dynactin-mediated transport [#9, #10], and its centrosomal activity is cell-cycle-regulated by PLK1, both directly and through LRRK1-mediated Ser140 phosphorylation within the γ-tubulin-binding motif that enhances γ-tubulin binding and spindle orientation [#11, #13, #17]. In addition to its cytoskeletal roles, CDK5RAP2 acts as a nuclear transcriptional regulator of spindle-checkpoint genes (BUBR1, MAD2) and CENP-A, with loss producing chromosome mis-segregation [#15, #20]. Loss of CDK5RAP2 in mice causes microcephaly through premature neural progenitor cell-cycle exit, apoptosis, and spindle defects, establishing its role in neurogenesis [#7, #8].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Established that CDK5RAP2 is a PCM-resident protein that anchors γTuRC to the centrosome, defining its core role in centrosomal microtubule nucleation.\",\n      \"evidence\": \"Co-IP, RNAi, and microtubule nucleation assays in cultured cells\",\n      \"pmids\": [\"17959831\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve whether binding directly activates nucleation versus only tethering γTuRC\", \"Mechanism of the conserved γTuRC-binding sequence not structurally defined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showed CDK5RAP2 maintains interphase centrosome cohesion through a pericentrin-linked mechanism distinct from rootletin/Cep68 fibers.\",\n      \"evidence\": \"RNAi, immunofluorescence, and co-IP for pericentrin in cultured cells\",\n      \"pmids\": [\"18042621\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular nature of the cohesion mechanism left vague\", \"Single lab\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined the γ-TuNA domain as a direct activator of γTuRC nucleation and mapped its association with NME7, FAM128A/B, and actin, distinguishing activation from γTuRC assembly.\",\n      \"evidence\": \"In vitro nucleation with purified γTuRC, mutagenesis, and RNAi\",\n      \"pmids\": [\"21135143\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of activation not determined at this stage\", \"Role of NME7/FAM128 in activation unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified an EB1-binding motif enabling CDK5RAP2 to track microtubule plus-ends and regulate dynamics, extending its role beyond minus-end nucleation.\",\n      \"evidence\": \"Co-IP, Ile/Leu-Pro dipeptide mutagenesis, live imaging, and in vitro assembly assays\",\n      \"pmids\": [\"19553473\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How plus-end and minus-end activities are coordinated in cells unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Mapped a CM2-like motif mediating pericentrin/AKAP450 binding that targets CDK5RAP2 to both centrosomes and Golgi, with calmodulin binding dispensable.\",\n      \"evidence\": \"Mutational analysis, co-IP, and subcellular fractionation\",\n      \"pmids\": [\"20466722\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of the Golgi pool not established\", \"Single lab\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined conserved CNN1/CNN2 domains that recruit PCM for centrosome-spindle pole attachment and link CDK5RAP2 to centriole cohesion and the G2 DNA-damage checkpoint.\",\n      \"evidence\": \"Domain deletion and gene disruption in DT40 cells with multiple phenotypic readouts\",\n      \"pmids\": [\"20368616\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct PCM components recruited by CNN1 not all identified\", \"Mechanistic link to DNA-damage arrest unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Established CDK5RAP2-pericentrin interdependence in neural progenitors and that its loss drives premature differentiation, connecting centrosome function to neurogenesis.\",\n      \"evidence\": \"Reciprocal RNAi phenocopy, co-IP, and cell-cycle analysis in neural progenitors\",\n      \"pmids\": [\"20471352\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How spindle/centrosome defects translate to fate decisions not fully resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstrated in vivo that Cdk5rap2 loss causes microcephaly via progenitor cell-cycle exit, apoptosis, and spindle abnormalities, and that it restricts centriole amplification.\",\n      \"evidence\": \"Mouse mutant/KO models with EM, BrdU labeling, and spindle/cilia analysis\",\n      \"pmids\": [\"20460369\", \"20627074\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contributions of cohesion versus nucleation defects to microcephaly unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed CDK5RAP2 centrosomal localization depends on dynein-dynactin and that it is in turn required for centrosomal dynein, defining bidirectional transport coupling.\",\n      \"evidence\": \"RNAi, live imaging, and dynein-dynactin perturbation\",\n      \"pmids\": [\"20139723\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect dynein dependency not separated\", \"Single lab\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated dynamic, microtubule-dependent centrosomal turnover of CDK5RAP2 via a dynein light chain 8-binding motif.\",\n      \"evidence\": \"FRAP, co-IP, and dominant-negative dynein-dynactin disruption\",\n      \"pmids\": [\"23874654\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of turnover dynamics not established\", \"Single lab\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Placed CDK5RAP2 in a PLK1-regulated proteolytic circuit (Cep68/SCF-βTrCP, PCNT cleavage) controlling its removal from PCM to govern centriole disengagement and duplication.\",\n      \"evidence\": \"Co-IP, mass spectrometry, degradation assays, and phospho-site mutagenesis\",\n      \"pmids\": [\"25503564\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How peripheral versus core PCM pools are differentially regulated mechanistically unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed CDK5RAP2-pericentrin interdependence drives centrosome maturation and bipolar spindle formation, with γ-tubulin binding dispensable for maturation itself.\",\n      \"evidence\": \"Knockdown-rescue with domain mutants and immunofluorescence\",\n      \"pmids\": [\"24466316\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Separating maturation scaffolding from nucleation function incompletely resolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified a PLK1>LRRK1>CDK5RAP2 Ser140 phosphorylation cascade that enhances γ-tubulin binding and regulates spindle orientation, linking mitotic kinase signaling to nucleation.\",\n      \"evidence\": \"In vitro kinase assay, phospho-site mutagenesis, co-IP, and spindle orientation assays\",\n      \"pmids\": [\"26192437\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other kinases redundantly target the γ-tubulin-binding motif unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established direct CDK5RAP2-HSET/KIFC1 binding that clusters supernumerary centrosomes into pseudo-bipolar spindles in cancer cells.\",\n      \"evidence\": \"Proteomics, co-IP, domain deletion, and patient-derived cell validation\",\n      \"pmids\": [\"26987684\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this clustering function is druggable in vivo not addressed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined functional redundancy between CDK5RAP2 and ASPM in spindle pole focusing that is independent of HSET localization and γ-tubulin activation.\",\n      \"evidence\": \"CRISPR KO, auxin-inducible degron, RNAi, and immunofluorescence\",\n      \"pmids\": [\"28883092\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of the pole-focusing activity unidentified\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Revealed an unexpected nuclear transcriptional role for CDK5RAP2 in regulating spindle-checkpoint genes BUBR1 and MAD2.\",\n      \"evidence\": \"RNAi, ChIP at promoters, and immunoblotting\",\n      \"pmids\": [\"19282672\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How a centrosomal scaffold acts as a transcriptional regulator unexplained\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated the PCNT-CDK5RAP2 matrix becomes essential for acentriolar spindle assembly via a microtubule- and PLK1-dependent process requiring γ-tubulin recruitment.\",\n      \"evidence\": \"Centrinone-induced centriole loss, CRISPR KO of PCNT and CDK5RAP2, and live imaging\",\n      \"pmids\": [\"33170211\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trigger that switches matrix assembly to essential mode unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed CEP215 localizes to oocyte acentriolar MTOCs in a pericentrin-dependent, Aurora A-sensitive manner and regulates meiotic spindle pole focusing without affecting γ-tubulin recruitment.\",\n      \"evidence\": \"siRNA, Aurora A inhibition, and super-resolution microscopy in mouse oocytes\",\n      \"pmids\": [\"31895686\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Why γ-tubulin recruitment is uncoupled in oocytes unexplained\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected CDK5RAP2 to cellular senescence via a GSK3β/β-catenin/WIP1 axis through direct GSK3β binding and inhibitory Ser9 phosphorylation.\",\n      \"evidence\": \"Co-IP, phospho-immunoblotting, and knockdown-rescue with ectopic WIP1\",\n      \"pmids\": [\"34930892\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether this signaling is centrosome-dependent unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified CDK5RAP2 as a positive transcriptional regulator of CENP-A whose loss causes chromosome segregation errors.\",\n      \"evidence\": \"RNAi, ChIP at the CENP-A promoter, and ectopic CENP-A rescue\",\n      \"pmids\": [\"33725591\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of promoter engagement unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Provided the structural mechanism of nucleation activation: CM1 binds multiple γTuRC modules to constrict the γ-tubulin ring toward microtubule geometry.\",\n      \"evidence\": \"Cryo-EM of reconstituted human γTuRC and single-molecule nucleation assays\",\n      \"pmids\": [\"39321808\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How constriction is regulated by phosphorylation/partners in cells not shown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Placed CDK5RAP2 downstream of the Arl2 GTPase in centrosomal microtubule growth and cortical neurogenesis.\",\n      \"evidence\": \"Co-IP, proximity ligation, RNAi, and overexpression rescue in mouse cortex\",\n      \"pmids\": [\"39137170\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether Arl2 regulates CDK5RAP2 localization directly unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed CDK5RAP2 self-assembles into micron-scale, PLK-1-regulated scaffolds that recruit/activate γTuRC and HSET to build microtubule asters, with F75 dispensable for recruitment but essential for activation.\",\n      \"evidence\": \"In vitro reconstitution, F75 mutagenesis, and aster formation assays (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.02.20.639226\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Preprint, single lab\", \"Whether scaffold self-assembly occurs identically in cells unverified\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealed cell-cycle-dependent material-state switching of CEP215 at centrosomes, with pericentrin and coiled-coil domains governing dynamicity and spindle pole assembly.\",\n      \"evidence\": \"FRAP, light-inducible clustering, and coiled-coil truncation mutagenesis\",\n      \"pmids\": [\"40270183\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular driver of the solid-to-dynamic transition unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CDK5RAP2's distinct activities—centrosomal scaffolding, γTuRC activation, plus-end tracking, and nuclear transcriptional regulation—are integrated and spatially partitioned within one protein remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting cytoplasmic scaffolding to promoter-level transcriptional control unknown\", \"Coordination of multiple binding motifs across the cell cycle undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 22, 27]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 4, 14]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [6, 11, 25]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [15, 20]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0, 2, 5]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [15, 20]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [5, 11, 16]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 1, 12]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [7, 8, 30]}\n    ],\n    \"complexes\": [\"γ-tubulin ring complex (γTuRC)\", \"PCNT-CDK5RAP2 pericentriolar matrix\", \"CEP215-Cep68-PCNT complex\"],\n    \"partners\": [\"PCNT\", \"EB1\", \"HSET/KIFC1\", \"Cep192\", \"GSK3B\", \"Cep68\", \"AKAP450\", \"NEDD1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}