Cyclin E/CDK2: DNA Replication, Replication Stress and Genomic Instability.

Cyclin E/CDK2: DNA Replication, Replication Stress and Genomic Instability.
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DOI:
10.3389/fcell.2021.774845
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发表时间:
2021
影响因子:
5.5
通讯作者:
Teixeira LK
Teixeira LK
中科院分区:
生物学2区
文献类型:
--
作者:
Fagundes R;Teixeira LK

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为了保持基因组的稳定性,DNA复制必须得到精确的控制。细胞周期各时相的转换受一系列细胞周期蛋白依赖性蛋白激酶(CDK)的调控,这些蛋白与相应的细胞周期蛋白调节亚基有关。在正常细胞周期中,E-型细胞周期蛋白(Cyclin E1和Cyclin E2、CCNE1和CCNE2基因)与CDK2结合,促进G1/S的转换。细胞周期蛋白E/CDK2复合体主要通过特定底物的磷酸化来控制细胞周期进程和DNA复制。Cyclin E/CDK2复合体的致癌激活会损害正常的DNA复制,导致复制应激和DNA损伤。因此,Cyclin E/CDK2诱导的复制应激导致基因组不稳定,并促进人类癌症的发生。本文综述了Cyclin E/CDK2复合体在正常DNA复制中的主要作用,以及Cyclin E/CDK2致癌激活导致复制应激和基因组不稳定的分子机制。
DNA replication must be precisely controlled in order to maintain genome stability. Transition through cell cycle phases is regulated by a family of Cyclin-Dependent Kinases (CDKs) in association with respective cyclin regulatory subunits. In normal cell cycles, E-type cyclins (Cyclin E1 and Cyclin E2, CCNE1 and CCNE2 genes) associate with CDK2 to promote G1/S transition. Cyclin E/CDK2 complex mostly controls cell cycle progression and DNA replication through phosphorylation of specific substrates. Oncogenic activation of Cyclin E/CDK2 complex impairs normal DNA replication, causing replication stress and DNA damage. As a consequence, Cyclin E/CDK2-induced replication stress leads to genomic instability and contributes to human carcinogenesis. In this review, we focus on the main functions of Cyclin E/CDK2 complex in normal DNA replication and the molecular mechanisms by which oncogenic activation of Cyclin E/CDK2 causes replication stress and genomic instability in human cancer.
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