p53 controls CDC7 levels to reinforce G1 cell cycle arrest upon genotoxic stress.
p53 controls CDC7 levels to reinforce G1 cell cycle arrest upon genotoxic stress.
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DOI:
10.1080/15384101.2016.1231281
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发表时间:
2016-11
期刊:
影响因子:
--
通讯作者:
Williams GH
中科院分区:
文献类型:
--
作者:
Tudzarova S;Mulholland P;Dey A;Stoeber K;Okorokov AL;Williams GH
DNA replication initiation is a key event in the cell cycle, which is dependent on 2 kinases - CDK2 and CDC7. Here we report a novel mechanism in which p53 induces G1 checkpoint and cell cycle arrest by downregulating CDC7 kinase in response to genotoxic stress. We demonstrate that p53 controls CDC7 stability post-transcriptionally via miR-192/215 and post-translationally via Fbxw7β E3 ubiquitin ligase. The p53-dependent pathway of CDC7 downregulation is interlinked with the p53-p21-CDK2 pathway, as p21-mediated inhibition of CDK2-dependent phosphorylation of CDC7 on Thr376 is required for GSK3ß-phosphorylation and Fbxw7ß-dependent degradation of CDC7. Notably, sustained oncogenic high levels of active CDC7 exert a negative feedback onto p53, leading to unrestrained S-phase progression and accumulation of DNA damage. Thus, p53-dependent control of CDC7 levels is essential for blocking G1/S cell-cycle transition upon genotoxic stress, thereby safeguarding the genome from instability and thus representing a novel general stress response.
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