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- W4361240733 abstract "<div>Abstract<p>Centrosomes are central regulators of mitosis that are often amplified in cancer cells. Centrosomes function both as organizers of the mitotic spindle and as reaction centers to trigger activation of Cdk1 and G<sub>2</sub>/M transition in the cell cycle, but their functional organization remains incomplete. Recent proteomic studies have identified novel components of the human centrosome including Cep63, a protein of unknown function that <i>Xenopus</i> studies have implicated in mitotic spindle assembly and spindle inactivation after DNA damage. Here, we report that human Cep63 binds to and recruits Cdk1 to centrosomes, and thereby regulates mitotic entry. RNAi-mediated Cep63 depletion in U2OS cancer cells induced polyploidization through mitotic skipping. Elicitation of this phenotype was associated with downregulation of centrosomal Cdk1, mimicking the phenotype induced by direct depletion of Cdk1. In contrast, Cep63 overexpression induced <i>de novo</i> centrosome amplification during cell-cycle interphase. Induction of this phenotype was suppressible by cell treatment with the Cdk inhibitor roscovitine. In a survey of 244 neuroblastoma cases, Cep63 mRNA overexpression was associated with <i>MYCN</i> oncogene amplification and poor prognosis. In cultured cells, Cep63 overexpression was associated with an enhancement in replication-induced DNA breakage. Together, our findings define human Cep63 as a centrosomal recruitment factor for Cdk1 that is essential for mitotic entry, providing a physical link between the centrosome and the cell-cycle machinery. <i>Cancer Res; 71(6); 2129–39. ©2011 AACR.</i></p></div>" @default.
- W4361240733 created "2023-03-31" @default.
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- W4361240733 date "2023-03-30" @default.
- W4361240733 modified "2023-09-25" @default.
- W4361240733 title "Data from Cep63 Recruits Cdk1 to the Centrosome: Implications for Regulation of Mitotic Entry, Centrosome Amplification, and Genome Maintenance" @default.
- W4361240733 doi "https://doi.org/10.1158/0008-5472.c.6502803.v1" @default.
- W4361240733 hasPublicationYear "2023" @default.
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