Human GEN1 and the SLX4-associated nucleases MUS81 and SLX1 are essential for the resolution of replication-induced Holliday junctions.

Human GEN1 and the SLX4-associated nucleases MUS81 and SLX1 are essential for the resolution of replication-induced Holliday junctions.
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DOI:
10.1016/j.celrep.2013.08.041
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发表时间:
2013-10-17
期刊:
影响因子:
8.8
通讯作者:
Smogorzewska A
Smogorzewska A
中科院分区:
生物学1区
文献类型:
--
作者:
Garner E;Kim Y;Lach FP;Kottemann MC;Smogorzewska A

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霍利迪连接(HJ),同源重组的DNA中间体,需要忠实地处理,以保持基因组的完整性。在人类细胞中,BLM解旋酶复合物促进双HJ的非溶核溶解。在体外,HJ可以通过MUS 81-EME 1、GEN 1和SLX 4-SLX 1进行核溶解加工。在这里,我们利用人SLX 4-null细胞来检查体内HJ分辨率的要求。BLM和SLX 4或GEN 1和SLX 4的缺乏在不存在外源DNA损伤的情况下是合成致死的,致死性是在未加工的HJ存在下进行的功能障碍性有丝分裂的结果。因此,GEN 1活性不能取代SLX 4相关的核酸酶,并且即使在BLM存在下,细胞活力也需要HJ解离酶活性之一,即与SLX 4或GEN 1相关的那些。体内HJ分辨率取决于SLX 4相关的MUS 81-EME 1和SLX 1,表明它们在SLX 4的背景下协同作用。
Holliday junctions (HJs), the DNA intermediates of homologous recombination need to be faithfully processed in order to preserve genome integrity. In human cells the BLM helicase complex promotes non-nucleolytic dissolution of double HJs. In vitro, HJs may be nucleolytically processed by MUS81-EME1, GEN1, and SLX4-SLX1. Here, we exploit human SLX4-null cells to examine the requirements for HJ resolution in vivo. Lack of BLM and SLX4 or GEN1 and SLX4 are synthetically lethal in the absence of exogenous DNA damage with lethality being a consequence of dysfunctional mitosis proceeding in the presence of unprocessed HJs. Thus, GEN1 activity cannot substitute for the SLX4-associated nucleases and one of the HJ resolvase activities, either those associated with SLX4 or GEN1 is required for cell viability even in the presence of BLM. In-vivo HJ resolution depends on both SLX4-associated MUS81-EME1 and SLX1, suggesting that they are acting in concert in the context of SLX4.
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