{"gene":"CPAP","run_date":"2026-04-28T17:28:53","timeline":{"discoveries":[{"year":2000,"finding":"CPAP (centrosomal P4.1-associated protein) was identified as a novel centrosomal protein that interacts with the head domain of protein 4.1R-135 (via yeast two-hybrid), co-sediments and co-immunoprecipitates with gamma-tubulin, indicating it is part of the gamma-tubulin complex, and localizes within the center of microtubule asters; anti-CPAP antibody significantly inhibited microtubule aster formation, suggesting CPAP participates in microtubule nucleation.","method":"Yeast two-hybrid, co-immunoprecipitation, sucrose gradient sedimentation, immunofluorescence, antibody inhibition assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, sucrose gradient co-sedimentation, functional antibody inhibition; multiple orthogonal methods in a single study","pmids":["11003675"],"is_preprint":false},{"year":2005,"finding":"Depletion of CPAP by RNAi arrested cells in mitosis and induced apoptosis, with >40% of mitotic cells showing multiple spindle poles; inhibition of kinesin Eg5 in CPAP-depleted cells resulted in monopolar spindles, demonstrating that Eg5 is required for multipolar spindle formation in the absence of CPAP and revealing a structural role for CPAP in maintaining centrosome integrity and normal spindle morphology during cell division.","method":"siRNA knockdown, inhibitor (monastrol) treatment, immunofluorescence microscopy","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD with defined cellular phenotype and epistasis with Eg5 inhibitor; single lab, two orthogonal approaches","pmids":["16316625"],"is_preprint":false},{"year":2008,"finding":"CPAP contains a microtubule-destabilizing domain (MDD; residues 311–422) adjacent to a microtubule-binding domain (MBD; residues 423–607); site-specific mutagenesis of the MDD (Y341P, I346P, L348P, triple-P, KR377EE) abolished microtubule-destabilizing activity and tubulin-dimer binding; conserved sequence in Drosophila d-SAS-4 similarly mediates MT destabilization, suggesting functional conservation.","method":"In vitro microtubule destabilization assay, site-directed mutagenesis, truncation analysis, tubulin-binding assay","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 1 — in vitro assay with mutagenesis defining catalytic/binding residues, replicated in ortholog","pmids":["18586240"],"is_preprint":false},{"year":2009,"finding":"CPAP expression is cell-cycle regulated, with the protein being degraded in late mitosis. Depletion of CPAP inhibited centrosome duplication, whereas excess CPAP induced formation of elongated procentriole-like structures (PLSs) containing stable microtubules and centriolar proteins. A tubulin-dimer binding-defective CPAP mutant (CPAP-377EE) significantly inhibited PLS formation, demonstrating that CPAP's intrinsic tubulin-dimer binding activity is required for procentriole elongation.","method":"RNAi depletion, overexpression, site-directed mutagenesis, immunofluorescence, ultrastructural analysis","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1–2 — loss- and gain-of-function combined with mutagenesis and ultrastructural validation; multiple orthogonal methods","pmids":["19503075"],"is_preprint":false},{"year":2009,"finding":"Overexpression of CPAP in human cells leads to accumulation of centriolar tubulin and dramatically elongated centrioles. CP110 (a distal end-capping protein) and CPAP play antagonistic roles: CPAP promotes tubulin addition and centriole elongation, while CP110 caps the distal end to limit elongation. Loss of CP110 also produces elongated MT structures that differ from genuine primary cilia.","method":"Overexpression, RNAi depletion, immunofluorescence, electron microscopy","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 — complementary gain- and loss-of-function experiments with ultrastructural validation; independently corroborated by Tang et al. same year","pmids":["19481458"],"is_preprint":false},{"year":2009,"finding":"CPAP forms a homodimer during interphase via its fifth coiled-coil domain; this self-interaction is required for maintaining centrosome cohesion and preventing premature centrosome splitting before G2/M. CPAP is phosphorylated during mitosis, and this phosphorylation releases the intermolecular interaction, orchestrating centrosome splitting and ensuring genomic stability.","method":"Co-immunoprecipitation, domain-mapping with truncation mutants, cell cycle analysis, immunofluorescence","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP and domain mapping with phosphorylation evidence; single lab","pmids":["19889632"],"is_preprint":false},{"year":2010,"finding":"Cep152 interacts with CPAP and recruits it to the centrosome; reduction of Cep152 causes loss of centrioles and failure of centriole duplication and prevents recruitment of both Plk4 and CPAP to the centrosome, placing Cep152 upstream of CPAP in the centriole biogenesis pathway.","method":"Co-immunoprecipitation, RNAi depletion, immunofluorescence, epistasis analysis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP and RNAi epistasis establishing pathway position; replicated across multiple experiments","pmids":["21059844"],"is_preprint":false},{"year":2010,"finding":"PLK2 phosphorylates CPAP at S589 and S595 in vitro and in vivo; this phosphorylation is critical for procentriole formation and centriole elongation during the centrosome cycle. Phosphorylated CPAP is preferentially located at the procentriole. Overexpression of a phospho-resistant CPAP mutant failed to support elongated centriole formation. PLK4 also phosphorylates S595 but is not a critical step in PLK4-driven procentriole assembly.","method":"In vitro kinase assay, phospho-specific antibody, overexpression of phospho-resistant mutant, immunofluorescence","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro kinase assay combined with in vivo phospho-site mutagenesis and localization; mechanistically rigorous","pmids":["20531387"],"is_preprint":false},{"year":2011,"finding":"STIL directly interacts with CPAP and forms a complex with hSAS6; a natural MCPH-causing CPAP mutation (E1235V) significantly reduces CPAP binding to STIL. STIL is required for procentriole formation and for localization of hSAS6 and CPAP to the base of nascent procentrioles; STIL depletion inhibits CPAP-induced centriole elongation, placing STIL and CPAP in a shared pathway for centriole biogenesis.","method":"Co-immunoprecipitation, pulldown, RNAi depletion, overexpression, immunofluorescence, disease-mutation analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, epistasis, and disease-mutation functional validation; multiple orthogonal methods","pmids":["22020124"],"is_preprint":false},{"year":2011,"finding":"CPAP protein domains required for centriolar localization and for centriole elongation and formation were identified; conditions mimicking CPAP MCPH patient mutations compromise centriole formation in tissue culture cells and correlate with randomization of spindle position as shown using adhesive micropatterns. STIL was also found essential for centriole formation and proper spindle positioning.","method":"Domain deletion analysis, overexpression, RNAi depletion, adhesive micropatterning, immunofluorescence","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 — domain mapping and functional epistasis; single lab, moderate mechanistic depth","pmids":["22100914"],"is_preprint":false},{"year":2012,"finding":"Tankyrase 1 PARsylates CPAP in vitro and in vivo; overexpression of tankyrase 1 leads to proteasomal degradation of CPAP, preventing centriole duplication, whereas depletion of tankyrase 1 stabilizes CPAP in G1 and generates elongated procentrioles and multipolarity. Tankyrase 1 localizes to centrosomes exclusively in G1, coinciding with CPAP degradation, establishing tankyrase 1-mediated PARsylation as a mechanism controlling CPAP levels to limit centriole elongation.","method":"In vitro PARsylation assay, overexpression/depletion, proteasome inhibition, immunofluorescence, cell cycle analysis","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro PARsylation reconstitution combined with in vivo gain/loss-of-function and rescue experiments","pmids":["22699936"],"is_preprint":false},{"year":2013,"finding":"CEP120 directly interacts with CPAP and is required for centriole duplication and elongation; CEP120 contains an N-terminal microtubule-binding domain, a C-terminal dimerization domain, and a centriolar localization domain. Depletion of CEP120 inhibits CPAP-induced centriole elongation and vice versa; a microtubule binding-defective CEP120-K76A mutant suppressed elongated centriole formation, indicating CEP120 and CPAP cooperate through microtubule binding to regulate centriole elongation.","method":"Co-immunoprecipitation, RNAi depletion, overexpression, site-directed mutagenesis, immunofluorescence","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, bidirectional epistasis, and mutagenesis; multiple orthogonal methods","pmids":["23857771"],"is_preprint":false},{"year":2015,"finding":"CPAP is a transcriptional target of the proneural factor Ascl1 in the embryonic cerebral cortex. In utero electroporation knockdown of Cenpj/CPAP disrupts centrosome biogenesis, randomizes cleavage plane orientation of radial glia progenitors, increases stable microtubules in post-mitotic neurons causing slower neuronal migration and aberrant centrosome positioning. Rescue experiments confirmed that Cenpj mediates Ascl1's role in centrosome biogenesis and microtubule dynamics.","method":"In utero electroporation RNAi, luciferase reporter assay, immunofluorescence, rescue experiments","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — in vivo RNAi with multiple cellular readouts and rescue; pathway positioning via Ascl1 epistasis","pmids":["25753651"],"is_preprint":false},{"year":2015,"finding":"Centrobin interacts with CPAP and prevents its proteasomal degradation; centrobin depletion renders CPAP undetectable via ubiquitin/proteasome-mediated degradation, while reintroduction of full-length centrobin (but not a CPAP-binding-defective mutant) restored CPAP levels. Centrobin overexpression caused proteasome-independent accumulation of ubiquitinated CPAP and abnormal elongated centrioles.","method":"Co-immunoprecipitation, RNAi depletion, proteasome inhibition, site-directed mutagenesis, immunofluorescence","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP and domain-mapping rescue, combined with proteasome inhibition evidence; multiple orthogonal approaches","pmids":["25616662"],"is_preprint":false},{"year":2016,"finding":"The PN2-3 domain of CPAP binds tubulin via two distinct structural elements: a C-terminal loop-helix targeting β-tubulin at the microtubule outer surface, and an N-terminal helical motif capping the α-β surface of β-tubulin. PN2-3 forms a high-affinity complex with GTP-tubulin, which is crucial for defining numbers and lengths of centriolar/ciliary microtubules. CPAP(F375A) with strongly reduced tubulin interaction causes shorter centrioles exhibiting doublet- instead of triplet-microtubules, while CPAP(EE343RR) induces over-elongation by enhanced dynamic release of bound tubulin ('clutch-like' mechanism).","method":"Crystal structure, in vitro binding assay, site-directed mutagenesis, functional overexpression/rescue, electron microscopy","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — structural determination combined with mutagenesis and in vivo functional validation; highly rigorous single study","pmids":["27306797"],"is_preprint":false},{"year":2016,"finding":"Aurora-A directly interacts with and phosphorylates CPAP at serine 467 during mitosis. This phosphorylation is required for maintenance of spindle pole integrity: depletion of CPAP or expression of non-phosphorylatable CPAP-S467A caused PCM dispersion and multipolar mitotic abnormalities, while phospho-mimic CPAP-S467D rescued PCM integrity. CPAP-S467D showed low microtubule-binding affinity but high affinity for PCM proteins.","method":"In vitro kinase assay, phospho-specific antibody, site-directed mutagenesis (phospho-mimic/resistant), immunofluorescence, Co-immunoprecipitation","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro kinase assay and in vivo mutagenesis rescue; mechanistically complete","pmids":["26997271"],"is_preprint":false},{"year":2018,"finding":"Tubulin interaction with CPAP negatively regulates CPAP-dependent pericentriolar material (PCM) recruitment and microtubule nucleation. A small molecule, CCB02, was identified that selectively binds the CPAP-binding site of tubulin. Genetic and chemical perturbation of CPAP-tubulin interaction activates extra centrosomes to nucleate enhanced numbers of microtubules, causing centrosome de-clustering, multipolar mitosis, and cell death in cancer cells with centrosome amplification.","method":"Small-molecule screening, in vitro binding assay, genetic perturbation, 3D-organotypic invasion assay, immunofluorescence","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 — chemical probe with defined binding site, genetic validation, and functional readout in multiple cancer models","pmids":["30530478"],"is_preprint":false},{"year":2019,"finding":"CPAP acts as a transcriptional coactivator of STAT3 by directly binding STAT3; CPAP overexpression increases tumor growth, angiogenesis, and metastasis in hepatocellular carcinoma. Interrupting the CPAP-STAT3 interaction attenuates STAT3-mediated tumor growth and angiogenesis. CPAP knockdown impairs IL-6-mediated STAT3 activation, target gene expression (IL-8, CD44), cell migration, and invasion.","method":"Co-immunoprecipitation, siRNA knockdown, overexpression, luciferase reporter assay, in vivo tumor models","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2–3 — Co-IP demonstrating direct binding, complemented by functional gain/loss-of-function; single lab","pmids":["31511651"],"is_preprint":false},{"year":2020,"finding":"Conditional knockout of Cpap in the mouse central nervous system preferentially induces monopolar spindles in radial glia progenitors, causes robust p53-dependent apoptosis disrupting embryonic brain development, and leads to cilia loss, RGP mislocalization, junctional integrity disruption, and severe cerebellar hypoplasia. Simultaneous removal of p53 rescues RGP death, indicating CPAP-loss-driven apoptosis is p53-dependent.","method":"Conditional knockout (Cre-lox), genetic epistasis (p53 co-deletion), immunofluorescence, histology","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — conditional knockout in vivo with genetic rescue (p53 epistasis) and multiple phenotypic readouts","pmids":["32501282"],"is_preprint":false},{"year":2020,"finding":"WDR62 mutant proteins (V66M and R439H) localize to the basal body but fail to recruit CPAP; as a consequence, recruitment of IFT88 (required for cilia formation) is deficient, leading to premature differentiation of radial glia and cortical thinning, placing WDR62 upstream of CPAP in a pathway controlling ciliogenesis and neocortical development.","method":"CRISPR/Cas9 knock-in mice, immunofluorescence co-localization, protein interaction analysis, histology","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo epistasis via CRISPR knock-in with defined localization defect; single study","pmids":["31816041"],"is_preprint":false},{"year":2022,"finding":"The MCPH-associated CPAP-E1235V mutant perturbs recruitment of centriolar elongation proteins (CEP120, CEP295, CENTROBIN, POC5, POC1B) onto nascent centrioles, producing short centrioles but long cilia. hiPSC-CPAP-E1235V-derived brain organoids exhibit p53-dependent neuronal cell death, altered spindle orientation of neuronal progenitor cells, and premature neuronal differentiation, resulting in smaller organoids that mimic microcephaly.","method":"CRISPR-Cas9 genome editing, hiPSC-derived brain organoids, immunofluorescence, proximity ligation assay","journal":"Frontiers in cell and developmental biology","confidence":"High","confidence_rationale":"Tier 2 — isogenic human iPSC model with CRISPR mutation and multiple mechanistic readouts including centriole protein localization and organoid phenotype","pmids":["35309908"],"is_preprint":false}],"current_model":"CPAP (centrosomal P4.1-associated protein/CENPJ) is a cell-cycle-regulated centrosomal protein that controls centriole length and biogenesis by binding GTP-tubulin via its PN2-3 domain through a 'clutch-like' mechanism that delivers tubulin to growing centriolar microtubules; its levels are kept in check by PLK2-mediated phosphorylation at S589/S595 (promoting procentriole assembly), Aurora-A phosphorylation at S467 (maintaining spindle pole integrity in mitosis), tankyrase 1-mediated PARsylation (targeting CPAP for proteasomal degradation in G1), and centrobin-mediated protection from degradation, while upstream factors Cep152 and WDR62 recruit CPAP to the centrosome, and STIL directly binds CPAP to co-ordinate procentriole formation; additionally, CPAP dimerizes via its fifth coiled-coil domain to maintain centrosome cohesion and functions as a transcriptional co-activator of STAT3 in cancer contexts."},"narrative":{"teleology":[{"year":2000,"claim":"Identifying CPAP as a centrosomal component associated with γ-tubulin established it as a candidate microtubule-nucleation factor, opening the question of how it contributes to centrosome function.","evidence":"Yeast two-hybrid, co-IP, sucrose gradient co-sedimentation with γ-tubulin, and antibody inhibition of aster formation in human cells","pmids":["11003675"],"confidence":"High","gaps":["Direct nucleation mechanism unclear","Relationship to centriole structure not addressed","Whether CPAP is a stoichiometric subunit of the γ-TuRC was not resolved"]},{"year":2005,"claim":"RNAi depletion revealed CPAP is essential for maintaining centrosome integrity during mitosis, with its loss causing multipolar spindles and mitotic arrest — shifting the model from nucleation accessory to structural centrosome component.","evidence":"siRNA knockdown in human cells combined with monastrol (Eg5 inhibitor) epistasis and immunofluorescence","pmids":["16316625"],"confidence":"Medium","gaps":["Single-lab observation","Mechanism of centrosome fragmentation unknown","Whether phenotype reflects centriole vs. PCM defect not distinguished"]},{"year":2008,"claim":"Mapping a discrete microtubule-destabilizing domain (MDD) with defined catalytic residues adjacent to a microtubule-binding domain showed CPAP directly modulates microtubule dynamics, not just nucleation.","evidence":"In vitro MT destabilization assay with site-directed mutagenesis; conservation confirmed in Drosophila SAS-4","pmids":["18586240"],"confidence":"High","gaps":["In vivo relevance of MDD activity not tested","How destabilization and stabilization activities are coordinated unknown"]},{"year":2009,"claim":"Gain- and loss-of-function studies demonstrated CPAP is a cell-cycle-regulated master regulator of centriole length: excess CPAP drives elongated procentriole-like structures, while CP110 antagonizes this elongation by capping distal ends.","evidence":"Overexpression/RNAi in human cells with electron microscopy and immunofluorescence; tubulin-binding-defective mutant (377EE) blocks elongation","pmids":["19503075","19481458"],"confidence":"High","gaps":["Mechanism of cell-cycle-dependent CPAP degradation not identified","Structural basis of CP110–CPAP antagonism unknown"]},{"year":2009,"claim":"Discovery that CPAP homodimerizes via its fifth coiled-coil domain and that mitotic phosphorylation releases this interaction explained how CPAP maintains centrosome cohesion in interphase and permits splitting at mitosis entry.","evidence":"Co-IP with truncation mutants, cell-cycle synchronization, immunofluorescence","pmids":["19889632"],"confidence":"Medium","gaps":["Kinase responsible for mitotic phosphorylation not identified at this stage","In vivo significance of dimerization not tested by point mutation"]},{"year":2010,"claim":"Identification of Cep152 as an upstream recruiter of CPAP and PLK2 as the kinase phosphorylating CPAP at S589/S595 for procentriole assembly placed CPAP within a defined signaling hierarchy for centriole duplication.","evidence":"Co-IP, RNAi epistasis for Cep152; in vitro kinase assay and phospho-resistant mutant analysis for PLK2","pmids":["21059844","20531387"],"confidence":"High","gaps":["Direct structural basis of Cep152–CPAP interaction not resolved","Whether PLK2 and PLK4 phosphorylation events are sequential or redundant unclear"]},{"year":2011,"claim":"STIL was established as a direct CPAP-binding partner essential for procentriole formation; the MCPH-causing E1235V mutation in CPAP disrupts this interaction, providing the first direct link between a specific CPAP molecular defect and microcephaly.","evidence":"Co-IP, pulldown, RNAi epistasis, and disease-mutation functional analysis in human cells","pmids":["22020124","22100914"],"confidence":"High","gaps":["Structural detail of CPAP–STIL interface unknown","How E1235V specifically perturbs brain development vs. other tissues not explained"]},{"year":2012,"claim":"Tankyrase 1-mediated PARsylation was shown to target CPAP for proteasomal degradation specifically in G1, solving the question of how CPAP levels are reset after mitosis to prevent centriole over-elongation.","evidence":"In vitro PARsylation reconstitution, overexpression/depletion of tankyrase 1, proteasome inhibition, cell-cycle analysis","pmids":["22699936"],"confidence":"High","gaps":["E3 ubiquitin ligase linking PARsylation to proteasomal degradation not identified","Whether tankyrase 1 regulation is conserved in non-human species unknown"]},{"year":2013,"claim":"CEP120 was identified as a direct CPAP partner that cooperates through microtubule binding to regulate centriole elongation, expanding the elongation module beyond CPAP alone.","evidence":"Reciprocal Co-IP, bidirectional RNAi epistasis, MT-binding-defective mutant (CEP120-K76A)","pmids":["23857771"],"confidence":"High","gaps":["Stoichiometry and order of CEP120–CPAP assembly on centrioles not defined","Whether CEP120 modulates CPAP tubulin-delivery activity directly is unknown"]},{"year":2015,"claim":"In vivo studies revealed CPAP's dual role in cortical development: centrosome biogenesis in radial glia progenitors and microtubule dynamics in migrating post-mitotic neurons, with centrobin identified as a stabilizer that protects CPAP from proteasomal degradation.","evidence":"In utero electroporation RNAi with rescue (Ascl1–CPAP axis); Co-IP and proteasome inhibition for centrobin–CPAP interaction","pmids":["25753651","25616662"],"confidence":"High","gaps":["How centrobin shielding is relieved for timely CPAP turnover unknown","Relative contributions of CPAP to progenitor division vs. neuronal migration not quantified"]},{"year":2016,"claim":"Crystal structure of the PN2-3–tubulin complex defined a 'clutch-like' tubulin delivery mechanism: two structural elements engage GTP-tubulin, and tuning their affinity via mutagenesis either shortens or over-elongates centrioles, providing the first atomic-level model for centriole length control.","evidence":"X-ray crystallography, in vitro binding, site-directed mutagenesis (F375A, EE343RR), electron microscopy of centrioles","pmids":["27306797"],"confidence":"High","gaps":["How the clutch mechanism is regulated in vivo by post-translational modifications not determined","Whether the mechanism applies to ciliary microtubule extension is untested"]},{"year":2016,"claim":"Aurora-A phosphorylation of CPAP at S467 was shown to maintain spindle pole integrity by switching CPAP from microtubule binding to PCM recruitment, revealing how CPAP function is remodeled during mitosis.","evidence":"In vitro kinase assay, phospho-mimic/resistant mutagenesis rescue, immunofluorescence","pmids":["26997271"],"confidence":"High","gaps":["Structural basis for phosphorylation-induced affinity switch not resolved","Whether Aurora-A targets CPAP at the same time as the dimerization-release event is unclear"]},{"year":2018,"claim":"Pharmacological disruption of the CPAP–tubulin interface (CCB02) validated the model that tubulin binding restrains PCM-dependent microtubule nucleation, offering a potential therapeutic strategy for cancers with centrosome amplification.","evidence":"Small-molecule screening, in vitro binding, genetic perturbation, 3D cancer cell models","pmids":["30530478"],"confidence":"High","gaps":["Selectivity and off-target profile of CCB02 in vivo not fully characterized","Whether the strategy is effective in primary tumors beyond cell lines unknown"]},{"year":2019,"claim":"A non-canonical nuclear function was uncovered: CPAP directly binds STAT3 and acts as a transcriptional co-activator promoting IL-6/STAT3-driven tumor growth and angiogenesis, extending CPAP's roles beyond centrosome biology.","evidence":"Co-IP, siRNA knockdown, luciferase reporter, in vivo xenograft tumor models in hepatocellular carcinoma","pmids":["31511651"],"confidence":"Medium","gaps":["Single-lab finding; independent replication needed","Mechanism by which a centrosomal protein accesses nuclear STAT3 targets not explained","Whether the STAT3 co-activator function is separable from centrosome roles unknown"]},{"year":2020,"claim":"Conditional knockout in mouse brain confirmed CPAP is essential for centriole/cilium biogenesis in radial glia; apoptosis of progenitors is p53-dependent, and WDR62 was placed upstream of CPAP in a ciliogenesis pathway controlling neocortical development.","evidence":"Cre-lox conditional knockout with p53 co-deletion rescue; CRISPR knock-in WDR62 mutant mice with CPAP localization analysis","pmids":["32501282","31816041"],"confidence":"High","gaps":["Whether p53 activation is via the mitotic surveillance pathway or DNA damage not distinguished","How WDR62 physically recruits CPAP is structurally unresolved"]},{"year":2022,"claim":"Human iPSC-derived brain organoids carrying the MCPH-causing E1235V mutation showed that CPAP is required for proper centriolar recruitment of elongation factors (CEP120, CEP295, centrobin, POC5, POC1B), directly linking the molecular defect to short centrioles, aberrant ciliogenesis, and microcephaly-like organoid phenotypes.","evidence":"CRISPR-Cas9 isogenic hiPSC lines, brain organoid culture, proximity ligation assay, immunofluorescence","pmids":["35309908"],"confidence":"High","gaps":["Whether the E1235V defect is rescuable by restoring STIL interaction alone is untested","Long-range cortical circuitry effects not modeled"]},{"year":null,"claim":"Key unresolved questions include the structural basis of the CPAP–STIL and CPAP–Cep152 interfaces, how multiple phosphorylation events (PLK2, Aurora-A, mitotic phosphorylation of coiled-coil domain) are temporally coordinated during the centrosome cycle, whether the STAT3 co-activator function is physiologically significant outside hepatocellular carcinoma, and the identity of the E3 ligase linking tankyrase 1-mediated PARsylation to CPAP ubiquitination.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model for CPAP–STIL or CPAP–Cep152 complexes","Temporal integration of PLK2, Aurora-A, and tankyrase 1 regulation not mapped","STAT3 co-activator role awaits independent replication"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,2,3,4,14,16]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[17]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[0,3,6,7,10,11,14,15]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[17]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1,3,4,5,7,10]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[3,4,6,8,11,14,20]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[12,18,19,20]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[18,20]}],"complexes":["γ-tubulin complex (co-sedimentation)"],"partners":["CEP152","STIL","CEP120","CNTROB","CP110","TNKS","PLK2","AURKA"],"other_free_text":[]},"mechanistic_narrative":"CPAP (CENPJ) is a cell-cycle-regulated centrosomal protein that governs centriole biogenesis, length control, and spindle pole integrity through its intrinsic tubulin-binding activities. Its PN2-3 domain forms a high-affinity complex with GTP-tubulin via a 'clutch-like' mechanism that delivers tubulin dimers to growing centriolar microtubules, thereby defining microtubule triplet number and centriole length, while an adjacent microtubule-destabilizing domain modulates local microtubule dynamics [PMID:27306797, PMID:18586240]. CPAP protein levels are tightly controlled: PLK2 phosphorylation at S589/S595 promotes procentriole assembly, Aurora-A phosphorylation at S467 maintains pericentriolar material cohesion during mitosis, tankyrase 1-mediated PARsylation targets CPAP for proteasomal degradation in G1, and centrobin binding shields CPAP from ubiquitin-dependent destruction [PMID:20531387, PMID:26997271, PMID:22699936, PMID:25616662]. Upstream factors Cep152 and WDR62 recruit CPAP to the centrosome, where it cooperates with STIL, CEP120, and hSAS6 to coordinate procentriole formation; loss-of-function mutations in CPAP cause autosomal recessive primary microcephaly (MCPH6), linked to defective centriole assembly, p53-dependent apoptosis of neural progenitors, and premature neuronal differentiation [PMID:21059844, PMID:22020124, PMID:23857771, PMID:32501282, PMID:35309908]."},"prefetch_data":{"uniprot":{"accession":"Q9HC77","full_name":"Centrosomal P4.1-associated protein","aliases":["Centromere protein J","CENP-J","Centrosome assembly and centriole elongation protein","LAG-3-associated protein","LYST-interacting protein 1"],"length_aa":1338,"mass_kda":153.0,"function":"Plays an important role in cell division and centrosome function by participating in centriole duplication (PubMed:17681131, PubMed:20531387). Inhibits microtubule nucleation from the centrosome. Involved in the regulation of slow processive growth of centriolar microtubules. Acts as a microtubule plus-end tracking protein that stabilizes centriolar microtubules and inhibits microtubule polymerization and extension from the distal ends of centrioles (PubMed:15047868, PubMed:27219064, PubMed:27306797). Required for centriole elongation and for STIL-mediated centriole amplification (PubMed:22020124). Required for the recruitment of CEP295 to the proximal end of new-born centrioles at the centriolar microtubule wall during early S phase in a PLK4-dependent manner (PubMed:27185865). May be involved in the control of centriolar-microtubule growth by acting as a regulator of tubulin release (PubMed:27306797)","subcellular_location":"Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome, centriole","url":"https://www.uniprot.org/uniprotkb/Q9HC77/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CPAP","classification":"Not 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Listeria adhesion protein (Lap) influences Lap-mediated Listeria monocytogenes paracellular translocation through epithelial barrier.","date":"2013","source":"Gut pathogens","url":"https://pubmed.ncbi.nlm.nih.gov/23799938","citation_count":22,"is_preprint":false},{"pmid":"35309908","id":"PMC_35309908","title":"Modeling Human Primary Microcephaly With hiPSC-Derived Brain Organoids Carrying CPAP-E1235V Disease-Associated Mutant Protein.","date":"2022","source":"Frontiers in cell and developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/35309908","citation_count":22,"is_preprint":false},{"pmid":"35519608","id":"PMC_35519608","title":"Characterization of Polymer Degrading Lipases, LIP1 and LIP2 From Pseudomonas chlororaphis PA23.","date":"2022","source":"Frontiers in bioengineering and biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/35519608","citation_count":21,"is_preprint":false},{"pmid":"34207717","id":"PMC_34207717","title":"MERTK-Mediated LC3-Associated Phagocytosis (LAP) of Apoptotic Substrates in Blood-Separated Tissues: Retina, Testis, Ovarian Follicles.","date":"2021","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/34207717","citation_count":20,"is_preprint":false},{"pmid":"31651224","id":"PMC_31651224","title":"LAP-like non-canonical autophagy and evolution of endocytic vacuoles in pancreatic acinar cells.","date":"2019","source":"Autophagy","url":"https://pubmed.ncbi.nlm.nih.gov/31651224","citation_count":20,"is_preprint":false},{"pmid":"38131222","id":"PMC_38131222","title":"Precisely Constructing Renal-Clearable and LAP-Activatable Ratiometric Molecular Probes for Early Diagnosis of Acute and Chronic Kidney Injury Via Optimizing Asymmetric DPP Dyes.","date":"2023","source":"Analytical chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/38131222","citation_count":20,"is_preprint":false},{"pmid":"25722319","id":"PMC_25722319","title":"Defective circulating CD4+LAP+ regulatory T cells in patients with dilated 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TSLP-TSLPR-LAP signaling between epithelial and dendritic cells through hyperlipidemia contributes to regulatory T-Cell defects in atherosclerotic mice.","date":"2014","source":"Atherosclerosis","url":"https://pubmed.ncbi.nlm.nih.gov/25544178","citation_count":17,"is_preprint":false},{"pmid":"34894664","id":"PMC_34894664","title":"Assembly Transformation Jointly Driven by the LAP Enzyme and GSH Boosting Theranostic Capability for Effective Tumor Therapy.","date":"2021","source":"ACS applied materials & interfaces","url":"https://pubmed.ncbi.nlm.nih.gov/34894664","citation_count":16,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48775,"output_tokens":5673,"usd":0.11571},"stage2":{"model":"claude-opus-4-6","input_tokens":9212,"output_tokens":4080,"usd":0.22209},"total_usd":0.3378,"stage1_batch_id":"msgbatch_011kfMfE81o6CTcyhVUqumuW","stage2_batch_id":"msgbatch_01DTputS6WNkH745x1nVSoBo","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"CPAP (centrosomal P4.1-associated protein) was identified as a novel centrosomal protein that interacts with the head domain of protein 4.1R-135 (via yeast two-hybrid), co-sediments and co-immunoprecipitates with gamma-tubulin, indicating it is part of the gamma-tubulin complex, and localizes within the center of microtubule asters; anti-CPAP antibody significantly inhibited microtubule aster formation, suggesting CPAP participates in microtubule nucleation.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, sucrose gradient sedimentation, immunofluorescence, antibody inhibition assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, sucrose gradient co-sedimentation, functional antibody inhibition; multiple orthogonal methods in a single study\",\n      \"pmids\": [\"11003675\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Depletion of CPAP by RNAi arrested cells in mitosis and induced apoptosis, with >40% of mitotic cells showing multiple spindle poles; inhibition of kinesin Eg5 in CPAP-depleted cells resulted in monopolar spindles, demonstrating that Eg5 is required for multipolar spindle formation in the absence of CPAP and revealing a structural role for CPAP in maintaining centrosome integrity and normal spindle morphology during cell division.\",\n      \"method\": \"siRNA knockdown, inhibitor (monastrol) treatment, immunofluorescence microscopy\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined cellular phenotype and epistasis with Eg5 inhibitor; single lab, two orthogonal approaches\",\n      \"pmids\": [\"16316625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CPAP contains a microtubule-destabilizing domain (MDD; residues 311–422) adjacent to a microtubule-binding domain (MBD; residues 423–607); site-specific mutagenesis of the MDD (Y341P, I346P, L348P, triple-P, KR377EE) abolished microtubule-destabilizing activity and tubulin-dimer binding; conserved sequence in Drosophila d-SAS-4 similarly mediates MT destabilization, suggesting functional conservation.\",\n      \"method\": \"In vitro microtubule destabilization assay, site-directed mutagenesis, truncation analysis, tubulin-binding assay\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro assay with mutagenesis defining catalytic/binding residues, replicated in ortholog\",\n      \"pmids\": [\"18586240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CPAP expression is cell-cycle regulated, with the protein being degraded in late mitosis. Depletion of CPAP inhibited centrosome duplication, whereas excess CPAP induced formation of elongated procentriole-like structures (PLSs) containing stable microtubules and centriolar proteins. A tubulin-dimer binding-defective CPAP mutant (CPAP-377EE) significantly inhibited PLS formation, demonstrating that CPAP's intrinsic tubulin-dimer binding activity is required for procentriole elongation.\",\n      \"method\": \"RNAi depletion, overexpression, site-directed mutagenesis, immunofluorescence, ultrastructural analysis\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — loss- and gain-of-function combined with mutagenesis and ultrastructural validation; multiple orthogonal methods\",\n      \"pmids\": [\"19503075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Overexpression of CPAP in human cells leads to accumulation of centriolar tubulin and dramatically elongated centrioles. CP110 (a distal end-capping protein) and CPAP play antagonistic roles: CPAP promotes tubulin addition and centriole elongation, while CP110 caps the distal end to limit elongation. Loss of CP110 also produces elongated MT structures that differ from genuine primary cilia.\",\n      \"method\": \"Overexpression, RNAi depletion, immunofluorescence, electron microscopy\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — complementary gain- and loss-of-function experiments with ultrastructural validation; independently corroborated by Tang et al. same year\",\n      \"pmids\": [\"19481458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CPAP forms a homodimer during interphase via its fifth coiled-coil domain; this self-interaction is required for maintaining centrosome cohesion and preventing premature centrosome splitting before G2/M. CPAP is phosphorylated during mitosis, and this phosphorylation releases the intermolecular interaction, orchestrating centrosome splitting and ensuring genomic stability.\",\n      \"method\": \"Co-immunoprecipitation, domain-mapping with truncation mutants, cell cycle analysis, immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP and domain mapping with phosphorylation evidence; single lab\",\n      \"pmids\": [\"19889632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Cep152 interacts with CPAP and recruits it to the centrosome; reduction of Cep152 causes loss of centrioles and failure of centriole duplication and prevents recruitment of both Plk4 and CPAP to the centrosome, placing Cep152 upstream of CPAP in the centriole biogenesis pathway.\",\n      \"method\": \"Co-immunoprecipitation, RNAi depletion, immunofluorescence, epistasis analysis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP and RNAi epistasis establishing pathway position; replicated across multiple experiments\",\n      \"pmids\": [\"21059844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PLK2 phosphorylates CPAP at S589 and S595 in vitro and in vivo; this phosphorylation is critical for procentriole formation and centriole elongation during the centrosome cycle. Phosphorylated CPAP is preferentially located at the procentriole. Overexpression of a phospho-resistant CPAP mutant failed to support elongated centriole formation. PLK4 also phosphorylates S595 but is not a critical step in PLK4-driven procentriole assembly.\",\n      \"method\": \"In vitro kinase assay, phospho-specific antibody, overexpression of phospho-resistant mutant, immunofluorescence\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro kinase assay combined with in vivo phospho-site mutagenesis and localization; mechanistically rigorous\",\n      \"pmids\": [\"20531387\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"STIL directly interacts with CPAP and forms a complex with hSAS6; a natural MCPH-causing CPAP mutation (E1235V) significantly reduces CPAP binding to STIL. STIL is required for procentriole formation and for localization of hSAS6 and CPAP to the base of nascent procentrioles; STIL depletion inhibits CPAP-induced centriole elongation, placing STIL and CPAP in a shared pathway for centriole biogenesis.\",\n      \"method\": \"Co-immunoprecipitation, pulldown, RNAi depletion, overexpression, immunofluorescence, disease-mutation analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, epistasis, and disease-mutation functional validation; multiple orthogonal methods\",\n      \"pmids\": [\"22020124\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CPAP protein domains required for centriolar localization and for centriole elongation and formation were identified; conditions mimicking CPAP MCPH patient mutations compromise centriole formation in tissue culture cells and correlate with randomization of spindle position as shown using adhesive micropatterns. STIL was also found essential for centriole formation and proper spindle positioning.\",\n      \"method\": \"Domain deletion analysis, overexpression, RNAi depletion, adhesive micropatterning, immunofluorescence\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — domain mapping and functional epistasis; single lab, moderate mechanistic depth\",\n      \"pmids\": [\"22100914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Tankyrase 1 PARsylates CPAP in vitro and in vivo; overexpression of tankyrase 1 leads to proteasomal degradation of CPAP, preventing centriole duplication, whereas depletion of tankyrase 1 stabilizes CPAP in G1 and generates elongated procentrioles and multipolarity. Tankyrase 1 localizes to centrosomes exclusively in G1, coinciding with CPAP degradation, establishing tankyrase 1-mediated PARsylation as a mechanism controlling CPAP levels to limit centriole elongation.\",\n      \"method\": \"In vitro PARsylation assay, overexpression/depletion, proteasome inhibition, immunofluorescence, cell cycle analysis\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro PARsylation reconstitution combined with in vivo gain/loss-of-function and rescue experiments\",\n      \"pmids\": [\"22699936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CEP120 directly interacts with CPAP and is required for centriole duplication and elongation; CEP120 contains an N-terminal microtubule-binding domain, a C-terminal dimerization domain, and a centriolar localization domain. Depletion of CEP120 inhibits CPAP-induced centriole elongation and vice versa; a microtubule binding-defective CEP120-K76A mutant suppressed elongated centriole formation, indicating CEP120 and CPAP cooperate through microtubule binding to regulate centriole elongation.\",\n      \"method\": \"Co-immunoprecipitation, RNAi depletion, overexpression, site-directed mutagenesis, immunofluorescence\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, bidirectional epistasis, and mutagenesis; multiple orthogonal methods\",\n      \"pmids\": [\"23857771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CPAP is a transcriptional target of the proneural factor Ascl1 in the embryonic cerebral cortex. In utero electroporation knockdown of Cenpj/CPAP disrupts centrosome biogenesis, randomizes cleavage plane orientation of radial glia progenitors, increases stable microtubules in post-mitotic neurons causing slower neuronal migration and aberrant centrosome positioning. Rescue experiments confirmed that Cenpj mediates Ascl1's role in centrosome biogenesis and microtubule dynamics.\",\n      \"method\": \"In utero electroporation RNAi, luciferase reporter assay, immunofluorescence, rescue experiments\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo RNAi with multiple cellular readouts and rescue; pathway positioning via Ascl1 epistasis\",\n      \"pmids\": [\"25753651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Centrobin interacts with CPAP and prevents its proteasomal degradation; centrobin depletion renders CPAP undetectable via ubiquitin/proteasome-mediated degradation, while reintroduction of full-length centrobin (but not a CPAP-binding-defective mutant) restored CPAP levels. Centrobin overexpression caused proteasome-independent accumulation of ubiquitinated CPAP and abnormal elongated centrioles.\",\n      \"method\": \"Co-immunoprecipitation, RNAi depletion, proteasome inhibition, site-directed mutagenesis, immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP and domain-mapping rescue, combined with proteasome inhibition evidence; multiple orthogonal approaches\",\n      \"pmids\": [\"25616662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The PN2-3 domain of CPAP binds tubulin via two distinct structural elements: a C-terminal loop-helix targeting β-tubulin at the microtubule outer surface, and an N-terminal helical motif capping the α-β surface of β-tubulin. PN2-3 forms a high-affinity complex with GTP-tubulin, which is crucial for defining numbers and lengths of centriolar/ciliary microtubules. CPAP(F375A) with strongly reduced tubulin interaction causes shorter centrioles exhibiting doublet- instead of triplet-microtubules, while CPAP(EE343RR) induces over-elongation by enhanced dynamic release of bound tubulin ('clutch-like' mechanism).\",\n      \"method\": \"Crystal structure, in vitro binding assay, site-directed mutagenesis, functional overexpression/rescue, electron microscopy\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structural determination combined with mutagenesis and in vivo functional validation; highly rigorous single study\",\n      \"pmids\": [\"27306797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Aurora-A directly interacts with and phosphorylates CPAP at serine 467 during mitosis. This phosphorylation is required for maintenance of spindle pole integrity: depletion of CPAP or expression of non-phosphorylatable CPAP-S467A caused PCM dispersion and multipolar mitotic abnormalities, while phospho-mimic CPAP-S467D rescued PCM integrity. CPAP-S467D showed low microtubule-binding affinity but high affinity for PCM proteins.\",\n      \"method\": \"In vitro kinase assay, phospho-specific antibody, site-directed mutagenesis (phospho-mimic/resistant), immunofluorescence, Co-immunoprecipitation\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro kinase assay and in vivo mutagenesis rescue; mechanistically complete\",\n      \"pmids\": [\"26997271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Tubulin interaction with CPAP negatively regulates CPAP-dependent pericentriolar material (PCM) recruitment and microtubule nucleation. A small molecule, CCB02, was identified that selectively binds the CPAP-binding site of tubulin. Genetic and chemical perturbation of CPAP-tubulin interaction activates extra centrosomes to nucleate enhanced numbers of microtubules, causing centrosome de-clustering, multipolar mitosis, and cell death in cancer cells with centrosome amplification.\",\n      \"method\": \"Small-molecule screening, in vitro binding assay, genetic perturbation, 3D-organotypic invasion assay, immunofluorescence\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — chemical probe with defined binding site, genetic validation, and functional readout in multiple cancer models\",\n      \"pmids\": [\"30530478\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CPAP acts as a transcriptional coactivator of STAT3 by directly binding STAT3; CPAP overexpression increases tumor growth, angiogenesis, and metastasis in hepatocellular carcinoma. Interrupting the CPAP-STAT3 interaction attenuates STAT3-mediated tumor growth and angiogenesis. CPAP knockdown impairs IL-6-mediated STAT3 activation, target gene expression (IL-8, CD44), cell migration, and invasion.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, overexpression, luciferase reporter assay, in vivo tumor models\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — Co-IP demonstrating direct binding, complemented by functional gain/loss-of-function; single lab\",\n      \"pmids\": [\"31511651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Conditional knockout of Cpap in the mouse central nervous system preferentially induces monopolar spindles in radial glia progenitors, causes robust p53-dependent apoptosis disrupting embryonic brain development, and leads to cilia loss, RGP mislocalization, junctional integrity disruption, and severe cerebellar hypoplasia. Simultaneous removal of p53 rescues RGP death, indicating CPAP-loss-driven apoptosis is p53-dependent.\",\n      \"method\": \"Conditional knockout (Cre-lox), genetic epistasis (p53 co-deletion), immunofluorescence, histology\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional knockout in vivo with genetic rescue (p53 epistasis) and multiple phenotypic readouts\",\n      \"pmids\": [\"32501282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"WDR62 mutant proteins (V66M and R439H) localize to the basal body but fail to recruit CPAP; as a consequence, recruitment of IFT88 (required for cilia formation) is deficient, leading to premature differentiation of radial glia and cortical thinning, placing WDR62 upstream of CPAP in a pathway controlling ciliogenesis and neocortical development.\",\n      \"method\": \"CRISPR/Cas9 knock-in mice, immunofluorescence co-localization, protein interaction analysis, histology\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo epistasis via CRISPR knock-in with defined localization defect; single study\",\n      \"pmids\": [\"31816041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The MCPH-associated CPAP-E1235V mutant perturbs recruitment of centriolar elongation proteins (CEP120, CEP295, CENTROBIN, POC5, POC1B) onto nascent centrioles, producing short centrioles but long cilia. hiPSC-CPAP-E1235V-derived brain organoids exhibit p53-dependent neuronal cell death, altered spindle orientation of neuronal progenitor cells, and premature neuronal differentiation, resulting in smaller organoids that mimic microcephaly.\",\n      \"method\": \"CRISPR-Cas9 genome editing, hiPSC-derived brain organoids, immunofluorescence, proximity ligation assay\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — isogenic human iPSC model with CRISPR mutation and multiple mechanistic readouts including centriole protein localization and organoid phenotype\",\n      \"pmids\": [\"35309908\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CPAP (centrosomal P4.1-associated protein/CENPJ) is a cell-cycle-regulated centrosomal protein that controls centriole length and biogenesis by binding GTP-tubulin via its PN2-3 domain through a 'clutch-like' mechanism that delivers tubulin to growing centriolar microtubules; its levels are kept in check by PLK2-mediated phosphorylation at S589/S595 (promoting procentriole assembly), Aurora-A phosphorylation at S467 (maintaining spindle pole integrity in mitosis), tankyrase 1-mediated PARsylation (targeting CPAP for proteasomal degradation in G1), and centrobin-mediated protection from degradation, while upstream factors Cep152 and WDR62 recruit CPAP to the centrosome, and STIL directly binds CPAP to co-ordinate procentriole formation; additionally, CPAP dimerizes via its fifth coiled-coil domain to maintain centrosome cohesion and functions as a transcriptional co-activator of STAT3 in cancer contexts.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CPAP (CENPJ) is a cell-cycle-regulated centrosomal protein that governs centriole biogenesis, length control, and spindle pole integrity through its intrinsic tubulin-binding activities. Its PN2-3 domain forms a high-affinity complex with GTP-tubulin via a 'clutch-like' mechanism that delivers tubulin dimers to growing centriolar microtubules, thereby defining microtubule triplet number and centriole length, while an adjacent microtubule-destabilizing domain modulates local microtubule dynamics [PMID:27306797, PMID:18586240]. CPAP protein levels are tightly controlled: PLK2 phosphorylation at S589/S595 promotes procentriole assembly, Aurora-A phosphorylation at S467 maintains pericentriolar material cohesion during mitosis, tankyrase 1-mediated PARsylation targets CPAP for proteasomal degradation in G1, and centrobin binding shields CPAP from ubiquitin-dependent destruction [PMID:20531387, PMID:26997271, PMID:22699936, PMID:25616662]. Upstream factors Cep152 and WDR62 recruit CPAP to the centrosome, where it cooperates with STIL, CEP120, and hSAS6 to coordinate procentriole formation; loss-of-function mutations in CPAP cause autosomal recessive primary microcephaly (MCPH6), linked to defective centriole assembly, p53-dependent apoptosis of neural progenitors, and premature neuronal differentiation [PMID:21059844, PMID:22020124, PMID:23857771, PMID:32501282, PMID:35309908].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Identifying CPAP as a centrosomal component associated with γ-tubulin established it as a candidate microtubule-nucleation factor, opening the question of how it contributes to centrosome function.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, sucrose gradient co-sedimentation with γ-tubulin, and antibody inhibition of aster formation in human cells\",\n      \"pmids\": [\"11003675\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct nucleation mechanism unclear\", \"Relationship to centriole structure not addressed\", \"Whether CPAP is a stoichiometric subunit of the γ-TuRC was not resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"RNAi depletion revealed CPAP is essential for maintaining centrosome integrity during mitosis, with its loss causing multipolar spindles and mitotic arrest — shifting the model from nucleation accessory to structural centrosome component.\",\n      \"evidence\": \"siRNA knockdown in human cells combined with monastrol (Eg5 inhibitor) epistasis and immunofluorescence\",\n      \"pmids\": [\"16316625\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab observation\", \"Mechanism of centrosome fragmentation unknown\", \"Whether phenotype reflects centriole vs. PCM defect not distinguished\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Mapping a discrete microtubule-destabilizing domain (MDD) with defined catalytic residues adjacent to a microtubule-binding domain showed CPAP directly modulates microtubule dynamics, not just nucleation.\",\n      \"evidence\": \"In vitro MT destabilization assay with site-directed mutagenesis; conservation confirmed in Drosophila SAS-4\",\n      \"pmids\": [\"18586240\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of MDD activity not tested\", \"How destabilization and stabilization activities are coordinated unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Gain- and loss-of-function studies demonstrated CPAP is a cell-cycle-regulated master regulator of centriole length: excess CPAP drives elongated procentriole-like structures, while CP110 antagonizes this elongation by capping distal ends.\",\n      \"evidence\": \"Overexpression/RNAi in human cells with electron microscopy and immunofluorescence; tubulin-binding-defective mutant (377EE) blocks elongation\",\n      \"pmids\": [\"19503075\", \"19481458\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of cell-cycle-dependent CPAP degradation not identified\", \"Structural basis of CP110–CPAP antagonism unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Discovery that CPAP homodimerizes via its fifth coiled-coil domain and that mitotic phosphorylation releases this interaction explained how CPAP maintains centrosome cohesion in interphase and permits splitting at mitosis entry.\",\n      \"evidence\": \"Co-IP with truncation mutants, cell-cycle synchronization, immunofluorescence\",\n      \"pmids\": [\"19889632\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Kinase responsible for mitotic phosphorylation not identified at this stage\", \"In vivo significance of dimerization not tested by point mutation\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identification of Cep152 as an upstream recruiter of CPAP and PLK2 as the kinase phosphorylating CPAP at S589/S595 for procentriole assembly placed CPAP within a defined signaling hierarchy for centriole duplication.\",\n      \"evidence\": \"Co-IP, RNAi epistasis for Cep152; in vitro kinase assay and phospho-resistant mutant analysis for PLK2\",\n      \"pmids\": [\"21059844\", \"20531387\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct structural basis of Cep152–CPAP interaction not resolved\", \"Whether PLK2 and PLK4 phosphorylation events are sequential or redundant unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"STIL was established as a direct CPAP-binding partner essential for procentriole formation; the MCPH-causing E1235V mutation in CPAP disrupts this interaction, providing the first direct link between a specific CPAP molecular defect and microcephaly.\",\n      \"evidence\": \"Co-IP, pulldown, RNAi epistasis, and disease-mutation functional analysis in human cells\",\n      \"pmids\": [\"22020124\", \"22100914\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural detail of CPAP–STIL interface unknown\", \"How E1235V specifically perturbs brain development vs. other tissues not explained\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Tankyrase 1-mediated PARsylation was shown to target CPAP for proteasomal degradation specifically in G1, solving the question of how CPAP levels are reset after mitosis to prevent centriole over-elongation.\",\n      \"evidence\": \"In vitro PARsylation reconstitution, overexpression/depletion of tankyrase 1, proteasome inhibition, cell-cycle analysis\",\n      \"pmids\": [\"22699936\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ubiquitin ligase linking PARsylation to proteasomal degradation not identified\", \"Whether tankyrase 1 regulation is conserved in non-human species unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"CEP120 was identified as a direct CPAP partner that cooperates through microtubule binding to regulate centriole elongation, expanding the elongation module beyond CPAP alone.\",\n      \"evidence\": \"Reciprocal Co-IP, bidirectional RNAi epistasis, MT-binding-defective mutant (CEP120-K76A)\",\n      \"pmids\": [\"23857771\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and order of CEP120–CPAP assembly on centrioles not defined\", \"Whether CEP120 modulates CPAP tubulin-delivery activity directly is unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"In vivo studies revealed CPAP's dual role in cortical development: centrosome biogenesis in radial glia progenitors and microtubule dynamics in migrating post-mitotic neurons, with centrobin identified as a stabilizer that protects CPAP from proteasomal degradation.\",\n      \"evidence\": \"In utero electroporation RNAi with rescue (Ascl1–CPAP axis); Co-IP and proteasome inhibition for centrobin–CPAP interaction\",\n      \"pmids\": [\"25753651\", \"25616662\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How centrobin shielding is relieved for timely CPAP turnover unknown\", \"Relative contributions of CPAP to progenitor division vs. neuronal migration not quantified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Crystal structure of the PN2-3–tubulin complex defined a 'clutch-like' tubulin delivery mechanism: two structural elements engage GTP-tubulin, and tuning their affinity via mutagenesis either shortens or over-elongates centrioles, providing the first atomic-level model for centriole length control.\",\n      \"evidence\": \"X-ray crystallography, in vitro binding, site-directed mutagenesis (F375A, EE343RR), electron microscopy of centrioles\",\n      \"pmids\": [\"27306797\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the clutch mechanism is regulated in vivo by post-translational modifications not determined\", \"Whether the mechanism applies to ciliary microtubule extension is untested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Aurora-A phosphorylation of CPAP at S467 was shown to maintain spindle pole integrity by switching CPAP from microtubule binding to PCM recruitment, revealing how CPAP function is remodeled during mitosis.\",\n      \"evidence\": \"In vitro kinase assay, phospho-mimic/resistant mutagenesis rescue, immunofluorescence\",\n      \"pmids\": [\"26997271\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for phosphorylation-induced affinity switch not resolved\", \"Whether Aurora-A targets CPAP at the same time as the dimerization-release event is unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Pharmacological disruption of the CPAP–tubulin interface (CCB02) validated the model that tubulin binding restrains PCM-dependent microtubule nucleation, offering a potential therapeutic strategy for cancers with centrosome amplification.\",\n      \"evidence\": \"Small-molecule screening, in vitro binding, genetic perturbation, 3D cancer cell models\",\n      \"pmids\": [\"30530478\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Selectivity and off-target profile of CCB02 in vivo not fully characterized\", \"Whether the strategy is effective in primary tumors beyond cell lines unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"A non-canonical nuclear function was uncovered: CPAP directly binds STAT3 and acts as a transcriptional co-activator promoting IL-6/STAT3-driven tumor growth and angiogenesis, extending CPAP's roles beyond centrosome biology.\",\n      \"evidence\": \"Co-IP, siRNA knockdown, luciferase reporter, in vivo xenograft tumor models in hepatocellular carcinoma\",\n      \"pmids\": [\"31511651\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab finding; independent replication needed\", \"Mechanism by which a centrosomal protein accesses nuclear STAT3 targets not explained\", \"Whether the STAT3 co-activator function is separable from centrosome roles unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Conditional knockout in mouse brain confirmed CPAP is essential for centriole/cilium biogenesis in radial glia; apoptosis of progenitors is p53-dependent, and WDR62 was placed upstream of CPAP in a ciliogenesis pathway controlling neocortical development.\",\n      \"evidence\": \"Cre-lox conditional knockout with p53 co-deletion rescue; CRISPR knock-in WDR62 mutant mice with CPAP localization analysis\",\n      \"pmids\": [\"32501282\", \"31816041\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether p53 activation is via the mitotic surveillance pathway or DNA damage not distinguished\", \"How WDR62 physically recruits CPAP is structurally unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Human iPSC-derived brain organoids carrying the MCPH-causing E1235V mutation showed that CPAP is required for proper centriolar recruitment of elongation factors (CEP120, CEP295, centrobin, POC5, POC1B), directly linking the molecular defect to short centrioles, aberrant ciliogenesis, and microcephaly-like organoid phenotypes.\",\n      \"evidence\": \"CRISPR-Cas9 isogenic hiPSC lines, brain organoid culture, proximity ligation assay, immunofluorescence\",\n      \"pmids\": [\"35309908\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the E1235V defect is rescuable by restoring STIL interaction alone is untested\", \"Long-range cortical circuitry effects not modeled\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of the CPAP–STIL and CPAP–Cep152 interfaces, how multiple phosphorylation events (PLK2, Aurora-A, mitotic phosphorylation of coiled-coil domain) are temporally coordinated during the centrosome cycle, whether the STAT3 co-activator function is physiologically significant outside hepatocellular carcinoma, and the identity of the E3 ligase linking tankyrase 1-mediated PARsylation to CPAP ubiquitination.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model for CPAP–STIL or CPAP–Cep152 complexes\", \"Temporal integration of PLK2, Aurora-A, and tankyrase 1 regulation not mapped\", \"STAT3 co-activator role awaits independent replication\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 2, 3, 4, 14, 16]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0, 3, 6, 7, 10, 11, 14, 15]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 3, 4, 5, 7, 10]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [3, 4, 6, 8, 11, 14, 20]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [12, 18, 19, 20]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [18, 20]}\n    ],\n    \"complexes\": [\n      \"γ-tubulin complex (co-sedimentation)\"\n    ],\n    \"partners\": [\n      \"CEP152\",\n      \"STIL\",\n      \"CEP120\",\n      \"CNTROB\",\n      \"CP110\",\n      \"TNKS\",\n      \"PLK2\",\n      \"AURKA\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}