Cyclin C is a haploinsufficient tumour suppressor.

Cyclin C is a haploinsufficient tumour suppressor.
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DOI:
10.1038/ncb3046
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发表时间:
2014-11
影响因子:
21.3
通讯作者:
--
中科院分区:
生物学1区
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--
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Cyclin C被克隆为促进生长的G1细胞周期蛋白,也被证明可以调节基因转录。在这里,我们报告了体内细胞周期蛋白C通过控制Notch1癌基因水平作为单倍不足的肿瘤抑制因子。细胞周期蛋白C激活一个“孤儿”CDK19激酶,以及CDK8和CDK3。这些细胞周期蛋白C-CDK复合物磷酸化Notch1胞内结构域(ICN1)并促进ICN1降解。细胞周期蛋白C基因消融阻断体内ICN1磷酸化,从而提高细胞周期蛋白C敲除小鼠的ICN1水平。细胞周期蛋白C消融或杂合性与其他致癌病变共同作用,加速t细胞急性淋巴细胞白血病(T-ALL)的发展。此外,细胞周期蛋白C基因在很大一部分人T-ALL中被杂合缺失,这些肿瘤表达的细胞周期蛋白C水平降低。我们还描述了人类T-ALL中的点突变,使细胞周期蛋白C-CDK无法磷酸化ICN1。因此,肿瘤细胞可能发展出不同的策略来逃避细胞周期蛋白C的抑制功能。
Cyclin C was cloned as a growth-promoting G1 cyclin, and was also shown to regulate gene transcription. Here we report that in vivo cyclin C acts as a haploinsufficient tumor suppressor, by controlling Notch1 oncogene levels. Cyclin C activates an “orphan” CDK19 kinase, as well as CDK8 and CDK3. These cyclin C-CDK complexes phosphorylate Notch1 intracellular domain (ICN1) and promote ICN1 degradation. Genetic ablation of cyclin C blocks ICN1 phosphorylation in vivo, thereby elevating ICN1 levels in cyclin C-knockout mice. Cyclin C ablation or heterozygosity collaborate with other oncogenic lesions and accelerate development of T-cell-acute lymphoblastic leukemia (T-ALL). Furthermore, the cyclin C gene is heterozygously deleted in a significant fraction of human T-ALL, and these tumors express reduced cyclin C levels. We also describe point mutations in human T-ALL that render cyclin C-CDK unable to phosphorylate ICN1. Hence, tumor cells may develop different strategies to evade cyclin C inhibitory function.
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