{"gene":"PCM1","run_date":"2026-06-10T05:19:53","timeline":{"discoveries":[{"year":2002,"finding":"PCM-1 localizes to centriolar satellite granules and is required for microtubule- and dynactin-dependent recruitment of centrin, pericentrin, and ninein to the centrosome. Inhibition or depletion of PCM-1 (via antibody microinjection, dominant-negative overexpression, or siRNA) disrupts radial microtubule organization without affecting microtubule nucleation. Loss of centrin or ninein also disrupts microtubule organization, placing PCM-1 upstream of these proteins in centrosome maturation.","method":"Antibody microinjection, dominant-negative overexpression, siRNA knockdown, immunofluorescence microscopy","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — three orthogonal loss-of-function approaches (antibody, dominant-negative, siRNA) converging on the same phenotype, replicated across conditions","pmids":["12403812"],"is_preprint":false},{"year":1994,"finding":"PCM-1 is a 228-kDa centrosomal protein that dissociates from the centrosome late in G2 and remains dispersed during mitosis, then re-associates with centrosomes in G1 daughter cells, demonstrating cell-cycle-dependent centrosome association.","method":"Immunofluorescence microscopy with anti-recombinant PCM-1 antibodies across cell cycle stages","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiment across cell cycle, single lab, single method but clear functional context","pmids":["8120099"],"is_preprint":false},{"year":2003,"finding":"PCM-1 self-aggregates through two distinct regions in its N-terminal domain to form granules (centriolar satellites), and this self-aggregation is regulated in a cell-cycle-dependent manner (disassembly during mitosis, reassembly in interphase). PCM-1 granules are distinct from pericentrin-containing granules but frequently associate with them.","method":"Overexpression of deletion mutants, immunofluorescence microscopy, co-localization studies","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — overexpression/deletion mapping of self-interaction domains, single lab, multiple cell types tested","pmids":["12571289"],"is_preprint":false},{"year":2001,"finding":"PCM-1 and pericentrin-B coimmunoprecipitate, indicating they form a functional complex. The association of both proteins with salt-stripped centrosomes requires intact microtubules. Immunodepletion of neither PCM-1 nor pericentrin-B inhibited microtubule nucleation from salt-stripped centrosomes.","method":"Coimmunoprecipitation, immunodepletion, microtubule nucleation assay, microtubule depolymerization","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and functional in vitro assay, single lab, two orthogonal methods","pmids":["11171385"],"is_preprint":false},{"year":2005,"finding":"PCM-1-containing centriolar satellites are required for centrosomal recruitment of Nek2 kinase and its substrate C-Nap1. Nek2 exists in dynamic cytoplasmic particles that partially colocalize with PCM-1 satellites. Depletion of PCM-1 by siRNA interferes with centrosomal recruitment of Nek2.","method":"siRNA knockdown of PCM-1, FRAP, immunofluorescence co-localization, co-sedimentation","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with specific centrosomal phenotype, FRAP dynamics, single lab","pmids":["15659651"],"is_preprint":false},{"year":2008,"finding":"CEP290 binds PCM-1 and localizes to centriolar satellites in a PCM-1- and microtubule-dependent manner. Depletion of CEP290 disrupts PCM-1 distribution and protein complex formation. Both CEP290 and PCM-1 are required for ciliogenesis and ciliary targeting of Rab8.","method":"Coimmunoprecipitation, siRNA knockdown, immunofluorescence microscopy","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP binding plus functional knockdown with ciliary phenotype, single lab","pmids":["18772192"],"is_preprint":false},{"year":2008,"finding":"PCM1 forms a complex with DISC1 and BBS4 through discrete binding domains in each protein. DISC1 and BBS4 are synergistically required for targeting PCM1 and cargo proteins (e.g., ninein) to the centrosome. Suppression of PCM1 in the developing cerebral cortex causes neuronal migration defects phenocopied by DISC1 or BBS4 suppression.","method":"Coimmunoprecipitation, immunofluorescence, RNAi in vivo (in utero electroporation)","journal":"Archives of general psychiatry","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP for binding domain mapping, in vivo RNAi with genetic epistasis, replicated across DISC1/BBS4/PCM1","pmids":["18762586"],"is_preprint":false},{"year":2010,"finding":"Hook3 is recruited to pericentriolar satellites through direct interaction with PCM1. Disruption of the Hook3-PCM1 interaction in vivo impairs interkinetic nuclear migration of embryonic neural progenitors, leading to overproduction of neurons and premature depletion of the neural progenitor pool.","method":"Coimmunoprecipitation, in utero electroporation (RNAi), live imaging","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP interaction with in vivo functional epistasis across multiple RNAi experiments, single lab but multiple orthogonal approaches","pmids":["20152126"],"is_preprint":false},{"year":2011,"finding":"Huntingtin (HTT) regulates retrograde trafficking of PCM1 to the centrosome through HAP1. Loss of Htt impairs PCM1 retrograde trafficking and reduces primary cilia formation. Pathogenic polyQ expansion causes centrosomal accumulation of PCM1 and abnormally long primary cilia. HTT-HAP1-PCM1 defines a pathway for centrosome protein trafficking and ciliogenesis.","method":"Conditional knockout mice, coimmunoprecipitation, immunofluorescence, live imaging, cilia measurement","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo mouse knockout, Co-IP, multiple orthogonal readouts (trafficking, cilia length, hydrocephalus), single lab","pmids":["21985783"],"is_preprint":false},{"year":2013,"finding":"PCM1 acts upstream of Plk1 and recruits Plk1 to the pericentriolar matrix in a dynein-dynactin-dependent manner to promote primary cilia disassembly before mitotic entry. PCM1-Plk1 interaction is phosphorylation-dependent with CDK1 acting as the priming kinase. Plk1 then activates HDAC6 to deacetylate and resorb cilia. shRNA depletion of PCM1 disrupts pericentriolar accumulation of Plk1.","method":"shRNA knockdown, coimmunoprecipitation, phosphorylation assays, immunofluorescence microscopy","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — shRNA KD with mechanistic pathway dissection (CDK1 priming kinase, Plk1 recruitment, HDAC6 activation), multiple orthogonal methods","pmids":["23345402"],"is_preprint":false},{"year":2016,"finding":"PCM1 is essential for tethering the E3 ubiquitin ligase Mindbomb1 (Mib1) to centriolar satellites. In the absence of PCM1, Mib1 destabilizes Talpid3 through poly-ubiquitylation and suppresses ciliogenesis. Loss of PCM1 blocks recruitment of Rab8-associated ciliary vesicles to centrioles; this block can be reversed by inactivating Mib1. An amino-terminal domain of PCM1 restores ciliogenesis and satellite localization of certain proteins.","method":"Gene deletion (PCM1 null human cells), coimmunoprecipitation, ubiquitylation assay, immunofluorescence, domain mapping","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — null cell line, domain mapping, ubiquitylation assay, multiple orthogonal methods in single rigorous study","pmids":["27146717"],"is_preprint":false},{"year":2016,"finding":"Plk4 phosphorylates PCM1 at the conserved S372 residue. This phosphorylation occurs during G1 phase and is required for PCM1 dimerization and interaction with other satellite components, as well as centriolar satellite integrity and ciliogenesis. Non-phosphorylatable S372A mutant recapitulates Plk4 depletion phenotypes; phosphomimetic mutant partially rescues dispersed satellites and ciliogenesis in PCM1-depleted cells.","method":"Kinase assay (Plk4 phosphorylation of PCM1), phosphomutant/phosphomimetic rescue experiments, coimmunoprecipitation, immunofluorescence","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay, mutagenesis (S372A/S372D), functional rescue, multiple orthogonal methods","pmids":["26755742"],"is_preprint":false},{"year":2019,"finding":"SNX17 recruits the deubiquitinating enzyme USP9X to antagonize MIB1-mediated ubiquitination and proteasomal degradation of PCM1 during serum-starvation-induced ciliogenesis. SNX17 deficiency leads to enhanced degradation of USP9X and PCM1 and disrupts ciliogenesis. This SNX17/USP9X pathway is dispensable for PCM1 homeostasis in serum-containing media.","method":"Co-immunoprecipitation, siRNA knockdown, ubiquitination assay, immunofluorescence, ciliogenesis assay","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, knockdown phenotype, ubiquitination assay, single lab","pmids":["31671755"],"is_preprint":false},{"year":2019,"finding":"Zika virus infection increases MIB1 (E3 ubiquitin ligase) levels, leading to MIB1-mediated ubiquitination and proteasomal degradation of PCM1, causing dispersion of PCM1-containing centriolar satellite granules. MIB1 knockout cells are resistant to ZIKV-induced PCM1 degradation and granule dispersion. Proteasome inhibitor MG132 prevents PCM1 loss.","method":"Viral infection, MIB1 knockout cells, proteasome inhibition (MG132), immunofluorescence, Western blot","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockout rescue, pharmacological inhibition, multiple orthogonal readouts, single lab","pmids":["31666336"],"is_preprint":false},{"year":2020,"finding":"Trichoplein (TCHP) localizes to centriolar satellites, binds PCM1, and stabilizes it. Loss of TCHP leads to delocalization and proteasome-dependent degradation of PCM1, and further results in degradation of PCM1's binding partner GABARAP, impairing autophagic flux in endothelial cells.","method":"Coimmunoprecipitation, siRNA knockdown, immunofluorescence, autophagic flux assay, Tchp knockout mice","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, KO mouse model, autophagic flux measurement, single lab multiple orthogonal methods","pmids":["32337819"],"is_preprint":false},{"year":2020,"finding":"PCM1 ablation in mice leads to progressive ciliary integrity defects, reduced available dopamine D2 receptor (D2R) levels, and behavioral abnormalities. Immunoprecipitation shows an association between Pcm1 and D2Rs. Antipsychotic drugs fail to rescue adult behavioral defects in Pcm1-null mice.","method":"Mouse knockout, immunoprecipitation, immunofluorescence, behavioral testing, RNAseq","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mouse KO with specific molecular phenotype (D2R association by Co-IP), single lab","pmids":["33214552"],"is_preprint":false},{"year":2013,"finding":"PCM1-JAK2 fusion protein signals through STAT5 to upregulate SOCS2 and SOCS3. Lentiviral knockdown of PCM1-JAK2 inhibited these top upregulated genes. Treatment with a selective JAK2 inhibitor confirmed that JAK2 is the active signaling moiety. PCM1-JAK2 requires pSTAT5 for its downstream signaling.","method":"Lentiviral shRNA knockdown, JAK2 inhibitor treatment, gene expression profiling","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockdown and pharmacological inhibition confirming pathway, single lab, multiple readouts","pmids":["23372669"],"is_preprint":false},{"year":2024,"finding":"Necrosulfonamide (NSA) causes oxidation and aggregation of PCM1 independently of MLKL, identifying PCM1 as a redox sensor protein. NSA-mediated ROS production disrupts ciliogenesis and leads to accumulation of autophagy markers; deletion of PCM1 partially alleviates NSA-induced autophagy accumulation.","method":"PCM1 deletion (CRISPR), ROS measurement, immunofluorescence, ciliogenesis assay, autophagy flux assay","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO rescue epistasis, pharmacological treatment, multiple functional readouts, single lab","pmids":["38600973"],"is_preprint":false},{"year":2025,"finding":"PCM1 binds centrosomal proteins and governs their translocation via intra-manchette transport during spermiogenesis. Pcm1 knockout mice exhibit disorganized manchette, head-tail coupling apparatus defects, defective flagellogenesis, and male infertility. Loss of PCM1 in sperm also causes severe retardation of embryo development that cannot be overcome by ICSI.","method":"Mouse knockout (Pcm1 KO), immunofluorescence, co-immunoprecipitation, electron microscopy, ICSI","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO with mechanistic characterization of cargo binding and transport, single lab","pmids":["40481240"],"is_preprint":false},{"year":2025,"finding":"Pcm1 is asymmetrically associated with Cep83 (a mother centrosome marker) in radial glia progenitors (RGPs) and is detected on Notch ligand-containing endosomes in a complex with Par-3 and dynein. Loss of pcm1 disrupts endosome dynamics (impairing Rab5b-to-Rab11a transition) and reduces Par-3/dynein macromolecular complex assembly on recycling endosomes, increasing neuronal differentiation at the expense of RGP self-renewal. PARD3-PCM1-CEP83-RAB11 associations are conserved in human cortical brain organoids.","method":"In vivo time-lapse imaging, expansion microscopy, coimmunoprecipitation, loss-of-function (pcm1 KO/KD), clonal analysis, brain organoids","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (live imaging, expansion microscopy, Co-IP, in vivo KO, organoids), mechanistic pathway established","pmids":["41315244"],"is_preprint":false},{"year":2025,"finding":"Centriolar satellites (CS) assemble via a hierarchical pathway in which PCM1 scaffold formation (through intrinsic multimerization modulated by the cytoskeleton) precedes regulated client recruitment. PCM1 and its clients occupy distinct subdomains with different compositions and dynamics. Perturbing PCM1 multimerization impairs ciliary signaling.","method":"Cellular and in vitro CS biogenesis assays, high-resolution imaging, spatiotemporal quantification, PCM1 multimerization mutants","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro reconstitution assay plus cellular imaging, novel mechanistic finding, preprint not yet peer-reviewed","pmids":["bio_10.1101_2025.07.27.666075"],"is_preprint":true},{"year":2025,"finding":"CCHCR1 interacts with PCM1 to determine its centrosomal localization. CCHCR1 also interacts with OFD1 (via its C-terminal coiled-coil domain) and recruits P-body proteins (EDC4) to the centrosome (via its N-terminal coiled-coil domain). Depletion of CCHCR1 impairs ciliogenesis, placing CCHCR1 in a PCM1/OFD1-dependent pathway for cilia development.","method":"BioID/mass spectrometry, coimmunoprecipitation, GST pulldown, AB-FRET, siRNA knockdown, CRISPR KO, immunofluorescence","journal":"Cellular & molecular biology letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple binding assays (BioID, Co-IP, GST pulldown, FRET) plus functional KO, single lab","pmids":["40883668"],"is_preprint":false},{"year":2005,"finding":"The PCM1-JAK2 fusion gene created by t(8;9)(p22;p24) encodes a chimeric protein retaining coiled-coil domains from PCM1 and the entire tyrosine kinase domain of JAK2. This fusion constitutively activates JAK2 kinase activity and drives hematologic malignancy. Reciprocal JAK2-PCM1 mRNA was not detected.","method":"RACE-PCR, RT-PCR, FISH, sequencing of chimeric mRNA","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 3 / Strong — molecular identification of fusion gene and prediction of constitutive activation confirmed across 7 patients, multiple detection methods","pmids":["15805263"],"is_preprint":false}],"current_model":"PCM1 is the essential scaffold protein of centriolar satellites — membrane-less granules that traffic centrosomal cargo along microtubules via dynein/dynactin — where it self-assembles through multimerization, recruits and stabilizes client proteins (including centrin, pericentrin, ninein, Nek2, CEP290, Talpid3, and others), tethers the E3 ligase Mib1 to satellites to prevent ectopic ubiquitylation of ciliogenic factors, acts as a phosphorylation substrate for both CDK1-primed Plk1 and Plk4 (at S372) to regulate its dimerization and satellite integrity in a cell-cycle-dependent manner, and links centrosome asymmetry to polarized endosome (Rab5b→Rab11a) dynamics and Notch signaling in neural progenitor fate decisions; in oncology, PCM1's coiled-coil domains mediate constitutive JAK2/STAT5 activation when fused to JAK2 by the t(8;9) translocation."},"narrative":{"mechanistic_narrative":"PCM1 is the core scaffold protein of centriolar satellites, membrane-less granules that organize the microtubule- and dynactin-dependent delivery of cargo to the centrosome and govern ciliogenesis [PMID:12403812, PMID:bio_10.1101_2025.07.27.666075]. It self-assembles into granules through intrinsic multimerization mediated by N-terminal regions, and this assembly is regulated across the cell cycle, dispersing in mitosis and reforming in interphase [PMID:8120099, PMID:12571289, PMID:bio_10.1101_2025.07.27.666075]. Satellite integrity and client recruitment are controlled by phosphorylation: Plk4 phosphorylates the conserved S372 residue during G1 to drive PCM1 dimerization and satellite assembly [PMID:26755742], while a CDK1-primed interaction recruits Plk1 to the pericentriolar matrix to trigger HDAC6-dependent cilia disassembly before mitosis [PMID:23345402]. As a scaffold, PCM1 recruits and stabilizes a broad set of clients to the centrosome—centrin, pericentrin, ninein, Nek2 and C-Nap1, CEP290, Hook3, and others—such that its loss disrupts radial microtubule organization and ciliogenesis [PMID:12403812, PMID:11171385, PMID:15659651, PMID:18772192, PMID:20152126]. PCM1 also tethers the E3 ligase Mib1 to satellites to restrain ubiquitylation of the ciliogenic factor Talpid3 and permit recruitment of Rab8 ciliary vesicles [PMID:27146717], and PCM1 abundance is itself set by ubiquitin-dependent turnover, opposed by SNX17/USP9X and trichoplein and promoted by Mib1 [PMID:31671755, PMID:31666336, PMID:32337819]. Through these activities PCM1 functions in neurodevelopment, linking centrosome asymmetry to polarized endosome dynamics (Rab5b→Rab11a) and Notch signaling in radial glia fate, and supporting neural progenitor migration via partners DISC1, BBS4, and Hook3 [PMID:18762586, PMID:20152126, PMID:41315244]. In disease, the t(8;9) translocation fuses PCM1 coiled-coil domains to the JAK2 kinase domain, producing constitutive JAK2/STAT5 signaling in hematologic malignancy [PMID:15805263, PMID:23372669].","teleology":[{"year":1994,"claim":"Established PCM1 as a large centrosomal protein whose association with the centrosome is cell-cycle-regulated, the first hint that it is a dynamic rather than constitutive structural component.","evidence":"Immunofluorescence across cell cycle stages with anti-recombinant PCM1 antibodies","pmids":["8120099"],"confidence":"Medium","gaps":["Mechanism driving cycle-dependent association unknown","No molecular function assigned"]},{"year":2001,"claim":"Showed PCM1 physically associates with pericentrin-B and that centrosomal retention of both depends on intact microtubules, defining microtubule-dependent trafficking of a centrosomal complex.","evidence":"Reciprocal co-IP and microtubule nucleation/depolymerization assays on salt-stripped centrosomes","pmids":["11171385"],"confidence":"Medium","gaps":["Did not establish satellite identity","No role in nucleation found"]},{"year":2002,"claim":"Placed PCM1 upstream in centrosome maturation by showing it is required for microtubule- and dynactin-dependent recruitment of centrin, pericentrin, and ninein.","evidence":"Three orthogonal loss-of-function approaches (antibody microinjection, dominant-negative, siRNA) with immunofluorescence","pmids":["12403812"],"confidence":"High","gaps":["Direct versus indirect recruitment of each cargo not resolved","Did not address ciliogenesis"]},{"year":2003,"claim":"Defined the self-assembly mechanism, showing two N-terminal regions drive cell-cycle-regulated granule formation, establishing PCM1 as the satellite scaffold.","evidence":"Deletion-mutant overexpression and co-localization microscopy","pmids":["12571289"],"confidence":"Medium","gaps":["Atomic basis of multimerization not defined","Regulators of assembly/disassembly unknown"]},{"year":2005,"claim":"Extended PCM1's scaffold role to recruitment of Nek2 kinase and C-Nap1, linking satellites to centrosomal kinase signaling.","evidence":"siRNA knockdown, FRAP, co-localization and co-sedimentation","pmids":["15659651"],"confidence":"Medium","gaps":["Direct binding interface not mapped","Functional consequence for Nek2 activity unaddressed"]},{"year":2005,"claim":"Identified the oncogenic PCM1-JAK2 fusion from t(8;9), showing PCM1 coiled-coil domains drive constitutive JAK2 kinase activation in hematologic malignancy.","evidence":"RACE-PCR, RT-PCR, FISH and sequencing across patients","pmids":["15805263"],"confidence":"Medium","gaps":["Downstream effector pathway not yet defined in this study","Mechanism of coiled-coil-driven dimerization not structurally resolved"]},{"year":2008,"claim":"Connected PCM1 to ciliogenesis by demonstrating a mutually dependent PCM1-CEP290 relationship required for ciliary Rab8 targeting.","evidence":"Co-IP and siRNA knockdown with ciliary phenotype","pmids":["18772192"],"confidence":"Medium","gaps":["Hierarchy with other satellite clients incomplete","Single-lab Co-IP"]},{"year":2008,"claim":"Linked PCM1 to neurodevelopment, showing it forms a DISC1/BBS4 complex required for cargo targeting and cortical neuronal migration.","evidence":"Co-IP domain mapping plus in utero electroporation RNAi with genetic epistasis","pmids":["18762586"],"confidence":"High","gaps":["Mechanism linking migration defect to specific cargo unresolved"]},{"year":2010,"claim":"Identified Hook3 as a direct PCM1 partner whose interaction governs interkinetic nuclear migration and neural progenitor pool maintenance.","evidence":"Co-IP, in utero electroporation RNAi, live imaging","pmids":["20152126"],"confidence":"High","gaps":["Molecular link from satellites to nuclear migration machinery not detailed"]},{"year":2011,"claim":"Defined a HTT-HAP1-PCM1 retrograde trafficking pathway controlling ciliogenesis, with polyQ expansion causing aberrant PCM1 accumulation and abnormal cilia.","evidence":"Conditional knockout mice, Co-IP, live imaging, cilia measurement","pmids":["21985783"],"confidence":"High","gaps":["How HAP1 hands PCM1 to dynein not resolved","Relationship to satellite assembly unaddressed"]},{"year":2013,"claim":"Established PCM1 as an upstream regulator of cilia disassembly, recruiting CDK1-primed Plk1 to activate HDAC6 before mitotic entry.","evidence":"shRNA knockdown, Co-IP, phosphorylation assays, immunofluorescence","pmids":["23345402"],"confidence":"High","gaps":["Phosphosite on PCM1 mediating Plk1 binding not mapped here"]},{"year":2013,"claim":"Defined downstream signaling of the PCM1-JAK2 fusion, showing STAT5-dependent upregulation of SOCS2/SOCS3.","evidence":"Lentiviral knockdown, JAK2 inhibitor treatment, expression profiling","pmids":["23372669"],"confidence":"Medium","gaps":["Causal role of SOCS genes in transformation not established"]},{"year":2016,"claim":"Identified Plk4 phosphorylation of PCM1 at S372 in G1 as the molecular trigger for PCM1 dimerization, satellite integrity, and ciliogenesis.","evidence":"In vitro kinase assay, S372A/S372D mutagenesis, functional rescue, Co-IP","pmids":["26755742"],"confidence":"High","gaps":["How phosphorylation alters dimerization structurally unresolved"]},{"year":2016,"claim":"Revealed that PCM1 tethers the E3 ligase Mib1 to satellites to prevent ectopic Talpid3 ubiquitylation and permit ciliary vesicle recruitment.","evidence":"PCM1-null human cells, Co-IP, ubiquitylation assay, domain mapping","pmids":["27146717"],"confidence":"High","gaps":["Full set of Mib1 substrates restrained by PCM1 not enumerated"]},{"year":2019,"claim":"Showed PCM1 abundance is set by ubiquitin-dependent turnover, with SNX17/USP9X deubiquitination opposing Mib1 specifically during starvation-induced ciliogenesis.","evidence":"Co-IP, siRNA knockdown, ubiquitination assay, ciliogenesis assay","pmids":["31671755"],"confidence":"Medium","gaps":["Context-specificity to serum starvation not mechanistically explained"]},{"year":2019,"claim":"Demonstrated that Zika virus exploits MIB1-mediated PCM1 degradation to disperse satellites, connecting viral infection to satellite disassembly.","evidence":"Viral infection, MIB1 knockout cells, MG132, immunofluorescence and Western blot","pmids":["31666336"],"confidence":"Medium","gaps":["How ZIKV raises MIB1 levels not defined"]},{"year":2020,"claim":"Identified trichoplein as a PCM1 stabilizer whose loss triggers proteasomal PCM1 degradation and impairs GABARAP-dependent autophagy.","evidence":"Co-IP, siRNA knockdown, autophagic flux assay, Tchp knockout mice","pmids":["32337819"],"confidence":"Medium","gaps":["Direct link between satellite integrity and autophagic flux incomplete"]},{"year":2020,"claim":"Linked PCM1 in vivo to dopamine D2 receptor availability and behavior, supporting a neuropsychiatric role.","evidence":"Mouse knockout, immunoprecipitation, behavioral testing, RNAseq","pmids":["33214552"],"confidence":"Medium","gaps":["Mechanism connecting ciliary defect to D2R level unresolved"]},{"year":2024,"claim":"Identified PCM1 as a redox-sensor whose oxidation/aggregation by necrosulfonamide disrupts ciliogenesis and drives autophagy accumulation.","evidence":"CRISPR deletion epistasis, ROS measurement, ciliogenesis and autophagy assays","pmids":["38600973"],"confidence":"Medium","gaps":["Physiological relevance of redox sensing not established","Oxidized residues not mapped"]},{"year":2025,"claim":"Established PCM1 as a cargo-trafficking scaffold in spermiogenesis, governing centrosomal protein translocation via intra-manchette transport with male infertility upon loss.","evidence":"Pcm1 knockout mice, Co-IP, electron microscopy, ICSI","pmids":["40481240"],"confidence":"Medium","gaps":["Specific cargo dependencies in manchette transport not fully mapped"]},{"year":2025,"claim":"Connected centrosome asymmetry to neural fate, showing PCM1 on Notch-ligand endosomes with Par-3 and dynein controls Rab5b→Rab11a transitions and progenitor self-renewal, conserved in human organoids.","evidence":"In vivo time-lapse imaging, expansion microscopy, Co-IP, loss-of-function, brain organoids","pmids":["41315244"],"confidence":"High","gaps":["How asymmetric Cep83 association directs PCM1 to endosomes unresolved"]},{"year":2025,"claim":"Identified CCHCR1 as a determinant of PCM1 centrosomal localization within a PCM1/OFD1 ciliogenesis pathway that recruits P-body proteins.","evidence":"BioID/MS, Co-IP, GST pulldown, AB-FRET, CRISPR KO, immunofluorescence","pmids":["40883668"],"confidence":"Medium","gaps":["Functional role of P-body protein recruitment to centrosome unclear"]},{"year":null,"claim":"How PCM1 multimerization is structurally organized into distinct satellite subdomains and how cytoskeletal and phosphorylation inputs are integrated into client recruitment hierarchy remain open.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No high-resolution structure of PCM1 multimers","Quantitative hierarchy of client recruitment incomplete","In vitro reconstitution evidence remains preprint"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,6,7,10,20]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[2,20]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[17]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[0,9,21]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[5,9,10]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,20]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,5,10,20]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1,9,11]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,8,10,18]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[6,7,19]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[14,17]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[16,22]}],"complexes":["centriolar satellite","PCM1-DISC1-BBS4 complex","PCM1-Par3-dynein endosomal complex"],"partners":["PCNT","CEP290","NEK2","HOOK3","DISC1","BBS4","MIB1","PLK1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q15154","full_name":"Pericentriolar material 1 protein","aliases":[],"length_aa":2024,"mass_kda":228.6,"function":"Required for centrosome assembly and function (PubMed:12403812, PubMed:15659651, PubMed:16943179). Essential for the correct localization of several centrosomal proteins including CEP250, CETN3, PCNT and NEK2 (PubMed:12403812, PubMed:15659651). Required to anchor microtubules to the centrosome (PubMed:12403812, PubMed:15659651). Also involved in cilium biogenesis by recruiting the BBSome, a ciliary protein complex involved in cilium biogenesis, to the centriolar satellites (PubMed:20551181, PubMed:24121310, PubMed:27979967). Recruits the tubulin polyglutamylase complex (TPGC) to centriolar satellites (PubMed:34782749)","subcellular_location":"Cytoplasm, cytoskeleton; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Cytoplasmic granule; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome, centriolar satellite; Cytoplasm, cytoskeleton, cilium basal body","url":"https://www.uniprot.org/uniprotkb/Q15154/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PCM1","classification":"Not 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Inhibition or depletion of PCM-1 (via antibody microinjection, dominant-negative overexpression, or siRNA) disrupts radial microtubule organization without affecting microtubule nucleation. Loss of centrin or ninein also disrupts microtubule organization, placing PCM-1 upstream of these proteins in centrosome maturation.\",\n      \"method\": \"Antibody microinjection, dominant-negative overexpression, siRNA knockdown, immunofluorescence microscopy\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — three orthogonal loss-of-function approaches (antibody, dominant-negative, siRNA) converging on the same phenotype, replicated across conditions\",\n      \"pmids\": [\"12403812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"PCM-1 is a 228-kDa centrosomal protein that dissociates from the centrosome late in G2 and remains dispersed during mitosis, then re-associates with centrosomes in G1 daughter cells, demonstrating cell-cycle-dependent centrosome association.\",\n      \"method\": \"Immunofluorescence microscopy with anti-recombinant PCM-1 antibodies across cell cycle stages\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiment across cell cycle, single lab, single method but clear functional context\",\n      \"pmids\": [\"8120099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"PCM-1 self-aggregates through two distinct regions in its N-terminal domain to form granules (centriolar satellites), and this self-aggregation is regulated in a cell-cycle-dependent manner (disassembly during mitosis, reassembly in interphase). PCM-1 granules are distinct from pericentrin-containing granules but frequently associate with them.\",\n      \"method\": \"Overexpression of deletion mutants, immunofluorescence microscopy, co-localization studies\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — overexpression/deletion mapping of self-interaction domains, single lab, multiple cell types tested\",\n      \"pmids\": [\"12571289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"PCM-1 and pericentrin-B coimmunoprecipitate, indicating they form a functional complex. The association of both proteins with salt-stripped centrosomes requires intact microtubules. Immunodepletion of neither PCM-1 nor pericentrin-B inhibited microtubule nucleation from salt-stripped centrosomes.\",\n      \"method\": \"Coimmunoprecipitation, immunodepletion, microtubule nucleation assay, microtubule depolymerization\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and functional in vitro assay, single lab, two orthogonal methods\",\n      \"pmids\": [\"11171385\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"PCM-1-containing centriolar satellites are required for centrosomal recruitment of Nek2 kinase and its substrate C-Nap1. Nek2 exists in dynamic cytoplasmic particles that partially colocalize with PCM-1 satellites. Depletion of PCM-1 by siRNA interferes with centrosomal recruitment of Nek2.\",\n      \"method\": \"siRNA knockdown of PCM-1, FRAP, immunofluorescence co-localization, co-sedimentation\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with specific centrosomal phenotype, FRAP dynamics, single lab\",\n      \"pmids\": [\"15659651\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CEP290 binds PCM-1 and localizes to centriolar satellites in a PCM-1- and microtubule-dependent manner. Depletion of CEP290 disrupts PCM-1 distribution and protein complex formation. Both CEP290 and PCM-1 are required for ciliogenesis and ciliary targeting of Rab8.\",\n      \"method\": \"Coimmunoprecipitation, siRNA knockdown, immunofluorescence microscopy\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP binding plus functional knockdown with ciliary phenotype, single lab\",\n      \"pmids\": [\"18772192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PCM1 forms a complex with DISC1 and BBS4 through discrete binding domains in each protein. DISC1 and BBS4 are synergistically required for targeting PCM1 and cargo proteins (e.g., ninein) to the centrosome. Suppression of PCM1 in the developing cerebral cortex causes neuronal migration defects phenocopied by DISC1 or BBS4 suppression.\",\n      \"method\": \"Coimmunoprecipitation, immunofluorescence, RNAi in vivo (in utero electroporation)\",\n      \"journal\": \"Archives of general psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP for binding domain mapping, in vivo RNAi with genetic epistasis, replicated across DISC1/BBS4/PCM1\",\n      \"pmids\": [\"18762586\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Hook3 is recruited to pericentriolar satellites through direct interaction with PCM1. Disruption of the Hook3-PCM1 interaction in vivo impairs interkinetic nuclear migration of embryonic neural progenitors, leading to overproduction of neurons and premature depletion of the neural progenitor pool.\",\n      \"method\": \"Coimmunoprecipitation, in utero electroporation (RNAi), live imaging\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP interaction with in vivo functional epistasis across multiple RNAi experiments, single lab but multiple orthogonal approaches\",\n      \"pmids\": [\"20152126\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Huntingtin (HTT) regulates retrograde trafficking of PCM1 to the centrosome through HAP1. Loss of Htt impairs PCM1 retrograde trafficking and reduces primary cilia formation. Pathogenic polyQ expansion causes centrosomal accumulation of PCM1 and abnormally long primary cilia. HTT-HAP1-PCM1 defines a pathway for centrosome protein trafficking and ciliogenesis.\",\n      \"method\": \"Conditional knockout mice, coimmunoprecipitation, immunofluorescence, live imaging, cilia measurement\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo mouse knockout, Co-IP, multiple orthogonal readouts (trafficking, cilia length, hydrocephalus), single lab\",\n      \"pmids\": [\"21985783\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PCM1 acts upstream of Plk1 and recruits Plk1 to the pericentriolar matrix in a dynein-dynactin-dependent manner to promote primary cilia disassembly before mitotic entry. PCM1-Plk1 interaction is phosphorylation-dependent with CDK1 acting as the priming kinase. Plk1 then activates HDAC6 to deacetylate and resorb cilia. shRNA depletion of PCM1 disrupts pericentriolar accumulation of Plk1.\",\n      \"method\": \"shRNA knockdown, coimmunoprecipitation, phosphorylation assays, immunofluorescence microscopy\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — shRNA KD with mechanistic pathway dissection (CDK1 priming kinase, Plk1 recruitment, HDAC6 activation), multiple orthogonal methods\",\n      \"pmids\": [\"23345402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PCM1 is essential for tethering the E3 ubiquitin ligase Mindbomb1 (Mib1) to centriolar satellites. In the absence of PCM1, Mib1 destabilizes Talpid3 through poly-ubiquitylation and suppresses ciliogenesis. Loss of PCM1 blocks recruitment of Rab8-associated ciliary vesicles to centrioles; this block can be reversed by inactivating Mib1. An amino-terminal domain of PCM1 restores ciliogenesis and satellite localization of certain proteins.\",\n      \"method\": \"Gene deletion (PCM1 null human cells), coimmunoprecipitation, ubiquitylation assay, immunofluorescence, domain mapping\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — null cell line, domain mapping, ubiquitylation assay, multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"27146717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Plk4 phosphorylates PCM1 at the conserved S372 residue. This phosphorylation occurs during G1 phase and is required for PCM1 dimerization and interaction with other satellite components, as well as centriolar satellite integrity and ciliogenesis. Non-phosphorylatable S372A mutant recapitulates Plk4 depletion phenotypes; phosphomimetic mutant partially rescues dispersed satellites and ciliogenesis in PCM1-depleted cells.\",\n      \"method\": \"Kinase assay (Plk4 phosphorylation of PCM1), phosphomutant/phosphomimetic rescue experiments, coimmunoprecipitation, immunofluorescence\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay, mutagenesis (S372A/S372D), functional rescue, multiple orthogonal methods\",\n      \"pmids\": [\"26755742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SNX17 recruits the deubiquitinating enzyme USP9X to antagonize MIB1-mediated ubiquitination and proteasomal degradation of PCM1 during serum-starvation-induced ciliogenesis. SNX17 deficiency leads to enhanced degradation of USP9X and PCM1 and disrupts ciliogenesis. This SNX17/USP9X pathway is dispensable for PCM1 homeostasis in serum-containing media.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, ubiquitination assay, immunofluorescence, ciliogenesis assay\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, knockdown phenotype, ubiquitination assay, single lab\",\n      \"pmids\": [\"31671755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Zika virus infection increases MIB1 (E3 ubiquitin ligase) levels, leading to MIB1-mediated ubiquitination and proteasomal degradation of PCM1, causing dispersion of PCM1-containing centriolar satellite granules. MIB1 knockout cells are resistant to ZIKV-induced PCM1 degradation and granule dispersion. Proteasome inhibitor MG132 prevents PCM1 loss.\",\n      \"method\": \"Viral infection, MIB1 knockout cells, proteasome inhibition (MG132), immunofluorescence, Western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout rescue, pharmacological inhibition, multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"31666336\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Trichoplein (TCHP) localizes to centriolar satellites, binds PCM1, and stabilizes it. Loss of TCHP leads to delocalization and proteasome-dependent degradation of PCM1, and further results in degradation of PCM1's binding partner GABARAP, impairing autophagic flux in endothelial cells.\",\n      \"method\": \"Coimmunoprecipitation, siRNA knockdown, immunofluorescence, autophagic flux assay, Tchp knockout mice\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, KO mouse model, autophagic flux measurement, single lab multiple orthogonal methods\",\n      \"pmids\": [\"32337819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PCM1 ablation in mice leads to progressive ciliary integrity defects, reduced available dopamine D2 receptor (D2R) levels, and behavioral abnormalities. Immunoprecipitation shows an association between Pcm1 and D2Rs. Antipsychotic drugs fail to rescue adult behavioral defects in Pcm1-null mice.\",\n      \"method\": \"Mouse knockout, immunoprecipitation, immunofluorescence, behavioral testing, RNAseq\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mouse KO with specific molecular phenotype (D2R association by Co-IP), single lab\",\n      \"pmids\": [\"33214552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PCM1-JAK2 fusion protein signals through STAT5 to upregulate SOCS2 and SOCS3. Lentiviral knockdown of PCM1-JAK2 inhibited these top upregulated genes. Treatment with a selective JAK2 inhibitor confirmed that JAK2 is the active signaling moiety. PCM1-JAK2 requires pSTAT5 for its downstream signaling.\",\n      \"method\": \"Lentiviral shRNA knockdown, JAK2 inhibitor treatment, gene expression profiling\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockdown and pharmacological inhibition confirming pathway, single lab, multiple readouts\",\n      \"pmids\": [\"23372669\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Necrosulfonamide (NSA) causes oxidation and aggregation of PCM1 independently of MLKL, identifying PCM1 as a redox sensor protein. NSA-mediated ROS production disrupts ciliogenesis and leads to accumulation of autophagy markers; deletion of PCM1 partially alleviates NSA-induced autophagy accumulation.\",\n      \"method\": \"PCM1 deletion (CRISPR), ROS measurement, immunofluorescence, ciliogenesis assay, autophagy flux assay\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO rescue epistasis, pharmacological treatment, multiple functional readouts, single lab\",\n      \"pmids\": [\"38600973\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PCM1 binds centrosomal proteins and governs their translocation via intra-manchette transport during spermiogenesis. Pcm1 knockout mice exhibit disorganized manchette, head-tail coupling apparatus defects, defective flagellogenesis, and male infertility. Loss of PCM1 in sperm also causes severe retardation of embryo development that cannot be overcome by ICSI.\",\n      \"method\": \"Mouse knockout (Pcm1 KO), immunofluorescence, co-immunoprecipitation, electron microscopy, ICSI\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO with mechanistic characterization of cargo binding and transport, single lab\",\n      \"pmids\": [\"40481240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Pcm1 is asymmetrically associated with Cep83 (a mother centrosome marker) in radial glia progenitors (RGPs) and is detected on Notch ligand-containing endosomes in a complex with Par-3 and dynein. Loss of pcm1 disrupts endosome dynamics (impairing Rab5b-to-Rab11a transition) and reduces Par-3/dynein macromolecular complex assembly on recycling endosomes, increasing neuronal differentiation at the expense of RGP self-renewal. PARD3-PCM1-CEP83-RAB11 associations are conserved in human cortical brain organoids.\",\n      \"method\": \"In vivo time-lapse imaging, expansion microscopy, coimmunoprecipitation, loss-of-function (pcm1 KO/KD), clonal analysis, brain organoids\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (live imaging, expansion microscopy, Co-IP, in vivo KO, organoids), mechanistic pathway established\",\n      \"pmids\": [\"41315244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Centriolar satellites (CS) assemble via a hierarchical pathway in which PCM1 scaffold formation (through intrinsic multimerization modulated by the cytoskeleton) precedes regulated client recruitment. PCM1 and its clients occupy distinct subdomains with different compositions and dynamics. Perturbing PCM1 multimerization impairs ciliary signaling.\",\n      \"method\": \"Cellular and in vitro CS biogenesis assays, high-resolution imaging, spatiotemporal quantification, PCM1 multimerization mutants\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro reconstitution assay plus cellular imaging, novel mechanistic finding, preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.07.27.666075\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CCHCR1 interacts with PCM1 to determine its centrosomal localization. CCHCR1 also interacts with OFD1 (via its C-terminal coiled-coil domain) and recruits P-body proteins (EDC4) to the centrosome (via its N-terminal coiled-coil domain). Depletion of CCHCR1 impairs ciliogenesis, placing CCHCR1 in a PCM1/OFD1-dependent pathway for cilia development.\",\n      \"method\": \"BioID/mass spectrometry, coimmunoprecipitation, GST pulldown, AB-FRET, siRNA knockdown, CRISPR KO, immunofluorescence\",\n      \"journal\": \"Cellular & molecular biology letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple binding assays (BioID, Co-IP, GST pulldown, FRET) plus functional KO, single lab\",\n      \"pmids\": [\"40883668\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The PCM1-JAK2 fusion gene created by t(8;9)(p22;p24) encodes a chimeric protein retaining coiled-coil domains from PCM1 and the entire tyrosine kinase domain of JAK2. This fusion constitutively activates JAK2 kinase activity and drives hematologic malignancy. Reciprocal JAK2-PCM1 mRNA was not detected.\",\n      \"method\": \"RACE-PCR, RT-PCR, FISH, sequencing of chimeric mRNA\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Strong — molecular identification of fusion gene and prediction of constitutive activation confirmed across 7 patients, multiple detection methods\",\n      \"pmids\": [\"15805263\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PCM1 is the essential scaffold protein of centriolar satellites — membrane-less granules that traffic centrosomal cargo along microtubules via dynein/dynactin — where it self-assembles through multimerization, recruits and stabilizes client proteins (including centrin, pericentrin, ninein, Nek2, CEP290, Talpid3, and others), tethers the E3 ligase Mib1 to satellites to prevent ectopic ubiquitylation of ciliogenic factors, acts as a phosphorylation substrate for both CDK1-primed Plk1 and Plk4 (at S372) to regulate its dimerization and satellite integrity in a cell-cycle-dependent manner, and links centrosome asymmetry to polarized endosome (Rab5b→Rab11a) dynamics and Notch signaling in neural progenitor fate decisions; in oncology, PCM1's coiled-coil domains mediate constitutive JAK2/STAT5 activation when fused to JAK2 by the t(8;9) translocation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PCM1 is the core scaffold protein of centriolar satellites, membrane-less granules that organize the microtubule- and dynactin-dependent delivery of cargo to the centrosome and govern ciliogenesis [#0, #20]. It self-assembles into granules through intrinsic multimerization mediated by N-terminal regions, and this assembly is regulated across the cell cycle, dispersing in mitosis and reforming in interphase [#1, #2, #20]. Satellite integrity and client recruitment are controlled by phosphorylation: Plk4 phosphorylates the conserved S372 residue during G1 to drive PCM1 dimerization and satellite assembly [#11], while a CDK1-primed interaction recruits Plk1 to the pericentriolar matrix to trigger HDAC6-dependent cilia disassembly before mitosis [#9]. As a scaffold, PCM1 recruits and stabilizes a broad set of clients to the centrosome\\u2014centrin, pericentrin, ninein, Nek2 and C-Nap1, CEP290, Hook3, and others\\u2014such that its loss disrupts radial microtubule organization and ciliogenesis [#0, #3, #4, #5, #7]. PCM1 also tethers the E3 ligase Mib1 to satellites to restrain ubiquitylation of the ciliogenic factor Talpid3 and permit recruitment of Rab8 ciliary vesicles [#10], and PCM1 abundance is itself set by ubiquitin-dependent turnover, opposed by SNX17/USP9X and trichoplein and promoted by Mib1 [#12, #13, #14]. Through these activities PCM1 functions in neurodevelopment, linking centrosome asymmetry to polarized endosome dynamics (Rab5b\\u2192Rab11a) and Notch signaling in radial glia fate, and supporting neural progenitor migration via partners DISC1, BBS4, and Hook3 [#6, #7, #19]. In disease, the t(8;9) translocation fuses PCM1 coiled-coil domains to the JAK2 kinase domain, producing constitutive JAK2/STAT5 signaling in hematologic malignancy [#22, #16].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Established PCM1 as a large centrosomal protein whose association with the centrosome is cell-cycle-regulated, the first hint that it is a dynamic rather than constitutive structural component.\",\n      \"evidence\": \"Immunofluorescence across cell cycle stages with anti-recombinant PCM1 antibodies\",\n      \"pmids\": [\"8120099\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism driving cycle-dependent association unknown\", \"No molecular function assigned\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Showed PCM1 physically associates with pericentrin-B and that centrosomal retention of both depends on intact microtubules, defining microtubule-dependent trafficking of a centrosomal complex.\",\n      \"evidence\": \"Reciprocal co-IP and microtubule nucleation/depolymerization assays on salt-stripped centrosomes\",\n      \"pmids\": [\"11171385\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not establish satellite identity\", \"No role in nucleation found\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Placed PCM1 upstream in centrosome maturation by showing it is required for microtubule- and dynactin-dependent recruitment of centrin, pericentrin, and ninein.\",\n      \"evidence\": \"Three orthogonal loss-of-function approaches (antibody microinjection, dominant-negative, siRNA) with immunofluorescence\",\n      \"pmids\": [\"12403812\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct versus indirect recruitment of each cargo not resolved\", \"Did not address ciliogenesis\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined the self-assembly mechanism, showing two N-terminal regions drive cell-cycle-regulated granule formation, establishing PCM1 as the satellite scaffold.\",\n      \"evidence\": \"Deletion-mutant overexpression and co-localization microscopy\",\n      \"pmids\": [\"12571289\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Atomic basis of multimerization not defined\", \"Regulators of assembly/disassembly unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Extended PCM1's scaffold role to recruitment of Nek2 kinase and C-Nap1, linking satellites to centrosomal kinase signaling.\",\n      \"evidence\": \"siRNA knockdown, FRAP, co-localization and co-sedimentation\",\n      \"pmids\": [\"15659651\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding interface not mapped\", \"Functional consequence for Nek2 activity unaddressed\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified the oncogenic PCM1-JAK2 fusion from t(8;9), showing PCM1 coiled-coil domains drive constitutive JAK2 kinase activation in hematologic malignancy.\",\n      \"evidence\": \"RACE-PCR, RT-PCR, FISH and sequencing across patients\",\n      \"pmids\": [\"15805263\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream effector pathway not yet defined in this study\", \"Mechanism of coiled-coil-driven dimerization not structurally resolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Connected PCM1 to ciliogenesis by demonstrating a mutually dependent PCM1-CEP290 relationship required for ciliary Rab8 targeting.\",\n      \"evidence\": \"Co-IP and siRNA knockdown with ciliary phenotype\",\n      \"pmids\": [\"18772192\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Hierarchy with other satellite clients incomplete\", \"Single-lab Co-IP\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Linked PCM1 to neurodevelopment, showing it forms a DISC1/BBS4 complex required for cargo targeting and cortical neuronal migration.\",\n      \"evidence\": \"Co-IP domain mapping plus in utero electroporation RNAi with genetic epistasis\",\n      \"pmids\": [\"18762586\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking migration defect to specific cargo unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified Hook3 as a direct PCM1 partner whose interaction governs interkinetic nuclear migration and neural progenitor pool maintenance.\",\n      \"evidence\": \"Co-IP, in utero electroporation RNAi, live imaging\",\n      \"pmids\": [\"20152126\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link from satellites to nuclear migration machinery not detailed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined a HTT-HAP1-PCM1 retrograde trafficking pathway controlling ciliogenesis, with polyQ expansion causing aberrant PCM1 accumulation and abnormal cilia.\",\n      \"evidence\": \"Conditional knockout mice, Co-IP, live imaging, cilia measurement\",\n      \"pmids\": [\"21985783\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How HAP1 hands PCM1 to dynein not resolved\", \"Relationship to satellite assembly unaddressed\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established PCM1 as an upstream regulator of cilia disassembly, recruiting CDK1-primed Plk1 to activate HDAC6 before mitotic entry.\",\n      \"evidence\": \"shRNA knockdown, Co-IP, phosphorylation assays, immunofluorescence\",\n      \"pmids\": [\"23345402\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphosite on PCM1 mediating Plk1 binding not mapped here\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined downstream signaling of the PCM1-JAK2 fusion, showing STAT5-dependent upregulation of SOCS2/SOCS3.\",\n      \"evidence\": \"Lentiviral knockdown, JAK2 inhibitor treatment, expression profiling\",\n      \"pmids\": [\"23372669\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal role of SOCS genes in transformation not established\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified Plk4 phosphorylation of PCM1 at S372 in G1 as the molecular trigger for PCM1 dimerization, satellite integrity, and ciliogenesis.\",\n      \"evidence\": \"In vitro kinase assay, S372A/S372D mutagenesis, functional rescue, Co-IP\",\n      \"pmids\": [\"26755742\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How phosphorylation alters dimerization structurally unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Revealed that PCM1 tethers the E3 ligase Mib1 to satellites to prevent ectopic Talpid3 ubiquitylation and permit ciliary vesicle recruitment.\",\n      \"evidence\": \"PCM1-null human cells, Co-IP, ubiquitylation assay, domain mapping\",\n      \"pmids\": [\"27146717\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full set of Mib1 substrates restrained by PCM1 not enumerated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed PCM1 abundance is set by ubiquitin-dependent turnover, with SNX17/USP9X deubiquitination opposing Mib1 specifically during starvation-induced ciliogenesis.\",\n      \"evidence\": \"Co-IP, siRNA knockdown, ubiquitination assay, ciliogenesis assay\",\n      \"pmids\": [\"31671755\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Context-specificity to serum starvation not mechanistically explained\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated that Zika virus exploits MIB1-mediated PCM1 degradation to disperse satellites, connecting viral infection to satellite disassembly.\",\n      \"evidence\": \"Viral infection, MIB1 knockout cells, MG132, immunofluorescence and Western blot\",\n      \"pmids\": [\"31666336\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How ZIKV raises MIB1 levels not defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified trichoplein as a PCM1 stabilizer whose loss triggers proteasomal PCM1 degradation and impairs GABARAP-dependent autophagy.\",\n      \"evidence\": \"Co-IP, siRNA knockdown, autophagic flux assay, Tchp knockout mice\",\n      \"pmids\": [\"32337819\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct link between satellite integrity and autophagic flux incomplete\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Linked PCM1 in vivo to dopamine D2 receptor availability and behavior, supporting a neuropsychiatric role.\",\n      \"evidence\": \"Mouse knockout, immunoprecipitation, behavioral testing, RNAseq\",\n      \"pmids\": [\"33214552\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting ciliary defect to D2R level unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified PCM1 as a redox-sensor whose oxidation/aggregation by necrosulfonamide disrupts ciliogenesis and drives autophagy accumulation.\",\n      \"evidence\": \"CRISPR deletion epistasis, ROS measurement, ciliogenesis and autophagy assays\",\n      \"pmids\": [\"38600973\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological relevance of redox sensing not established\", \"Oxidized residues not mapped\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established PCM1 as a cargo-trafficking scaffold in spermiogenesis, governing centrosomal protein translocation via intra-manchette transport with male infertility upon loss.\",\n      \"evidence\": \"Pcm1 knockout mice, Co-IP, electron microscopy, ICSI\",\n      \"pmids\": [\"40481240\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific cargo dependencies in manchette transport not fully mapped\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Connected centrosome asymmetry to neural fate, showing PCM1 on Notch-ligand endosomes with Par-3 and dynein controls Rab5b\\u2192Rab11a transitions and progenitor self-renewal, conserved in human organoids.\",\n      \"evidence\": \"In vivo time-lapse imaging, expansion microscopy, Co-IP, loss-of-function, brain organoids\",\n      \"pmids\": [\"41315244\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How asymmetric Cep83 association directs PCM1 to endosomes unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified CCHCR1 as a determinant of PCM1 centrosomal localization within a PCM1/OFD1 ciliogenesis pathway that recruits P-body proteins.\",\n      \"evidence\": \"BioID/MS, Co-IP, GST pulldown, AB-FRET, CRISPR KO, immunofluorescence\",\n      \"pmids\": [\"40883668\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of P-body protein recruitment to centrosome unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How PCM1 multimerization is structurally organized into distinct satellite subdomains and how cytoskeletal and phosphorylation inputs are integrated into client recruitment hierarchy remain open.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No high-resolution structure of PCM1 multimers\", \"Quantitative hierarchy of client recruitment incomplete\", \"In vitro reconstitution evidence remains preprint\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 6, 7, 10, 20]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [2, 20]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005814\", \"supporting_discovery_ids\": [0, 1, 3]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0, 9, 21]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [5, 9, 10]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 20]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 5, 10, 20]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 9, 11]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 8, 10, 18]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [6, 7, 19]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [14, 17]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [16, 22]}\n    ],\n    \"complexes\": [\n      \"centriolar satellite\",\n      \"PCM1-DISC1-BBS4 complex\",\n      \"PCM1-Par3-dynein endosomal complex\"\n    ],\n    \"partners\": [\n      \"PCNT\",\n      \"CEP290\",\n      \"NEK2\",\n      \"HOOK3\",\n      \"DISC1\",\n      \"BBS4\",\n      \"MIB1\",\n      \"PLK1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}