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MOL CELL:什么是BRCA1 / 2缺失的乳腺癌细胞存活必须的?

2019-07-03 海北 MedSci原创

已有的研究显示,准确的DNA复制对于保持基因组完整性和预防染色体不稳定相关疾病(包括癌症)至关重要。

已有的研究显示,准确的DNA复制对于保持基因组完整性和预防染色体不稳定相关疾病(包括癌症)至关重要。这个过程的关键是细胞稳定和重启停滞的复制叉的能力。

最近,研究人员发现,EXD2核酸酶对这个过程至关重要。 

EXD2被招募到压力下的复制叉,可以通过抑制过度的叉回归来抑制它们的降解。因此,EXD2缺乏导致复制叉的崩溃,对复制抑制剂的超敏感性,以及基因组不稳定性。

通过灭活SMARCAL1或去除RECQ1EXD2 - / - 细胞中的抑制,来阻止复制叉的回归,可以恢复有效的复制叉重启和基因组稳定性。

此外,纯化的EXD2可以有效地模拟回归叉,处理基质。

因此,这项工作确定了一个由EXD2的核酸酶活性支撑的机制,通过该机制细胞可以平衡复制叉的回归与修复,以维持基因组稳定性。

有趣的是,从临床角度来看,研究人员发现EXD2的消耗对于BRCA1 / 2突变的细胞是合成致死的,这意味着复制叉保护中的非冗余作用。


原始出处:

Nieminuszczy J et al. EXD2 Protects Stressed Replication Forks and Is Required for Cell Viability in the Absence of BRCA1/2. MOL CELL, 2019; doi: 10.1016/j.molcel.2019.05.026.


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    2019-11-20 维他命
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    2019-07-07 cqykthl

    什么是BRCA1/2缺失的乳腺癌细胞存活必须的?

    0

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    2019-07-05 yxch36
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    2019-07-05 智智灵药

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