Loss of Geminin induces rereplication in the presence of functional p53.

Loss of Geminin induces rereplication in the presence of functional p53.
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DOI:
10.1083/jcb.200403106
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发表时间:
2004-05-24
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Helin K
Helin K
中科院分区:
其他
文献类型:
--
作者:
Melixetian M;Ballabeni A;Masiero L;Gasparini P;Zamponi R;Bartek J;Lukas J;Helin K

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对DNA复制的严格调控对于确保细胞周期中染色体的适当复制和分离至关重要,因为其放松调控可能会导致基因组不稳定和癌症。因此,真核生物进化出多种机制,将DNA复制限制在每个细胞周期一次。在这里,我们展示了一种来源许可的抑制物Gminin的失活,导致在相同的细胞周期内在人类正常细胞和肿瘤细胞中重新复制。我们发现在再复制细胞中有一个依赖于CHK1的检查点被激活,并伴随着γ、H_2AX和RAD51核团的形成。取消检查点会导致有丝分裂流产和复制细胞死亡。此外,我们还证明了再复制的诱导依赖于复制起始因子CDT1和CDC6,而与P53的功能状态无关。这些数据表明,在人类细胞中,维持基因组稳定性所需的是双黄素。
Strict regulation of DNA replication is essential to ensure proper duplication and segregation of chromosomes during the cell cycle, as its deregulation can lead to genomic instability and cancer. Thus, eukaryotic organisms have evolved multiple mechanisms to restrict DNA replication to once per cell cycle. Here, we show that inactivation of Geminin, an inhibitor of origin licensing, leads to rereplication in human normal and tumor cells within the same cell cycle. We found a CHK1-dependent checkpoint to be activated in rereplicating cells accompanied by formation of γH2AX and RAD51 nuclear foci. Abrogation of the checkpoint leads to abortive mitosis and death of rereplicated cells. In addition, we demonstrate that the induction of rereplication is dependent on the replication initiation factors CDT1 and CDC6, and independent of the functional status of p53. These data show that Geminin is required for maintaining genomic stability in human cells.
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