PARP1 and PARP2 stabilise replication forks at base excision repair intermediates through Fbh1-dependent Rad51 regulation

PARP1 and PARP2 stabilise replication forks at base excision repair intermediates through Fbh1-dependent Rad51 regulation
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PARP1 和 PARP2 通过 Fbh1 依赖性 Rad51 调节稳定碱基切除修复中间体的复制叉

DOI:
10.1101/243071
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发表时间:
2018
期刊:
--
影响因子:
--
通讯作者:
Ronson G
Ronson G
中科院分区:
--
文献类型:
--
作者:
Ronson G

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PARP1调节直接产生的或在碱基切除修复(BER)过程中产生的DNA单链断裂的修复。然而,PARP2在这些和其他修复机制中的作用尚不清楚。在这里,我们报告了PARP2在稳定遇到BER中间体的复制叉时需要通过FBH1依赖的RAD51调节。虽然PARP2对于细胞对SSB的耐受或同源重组功能障碍是不必要的,但在BER中它与PARP1是多余的。因此,PARP1和PARP2的联合破坏会导致BER缺陷,导致复制相关DNA损伤水平上升,这是因为无法稳定受损复制叉处的RAD51,并防止不受控制的DNA切除。总之,我们的结果证明了PARP1和PARP2是如何通过直接促进BER和稳定遇到BER中间体的复制叉来调节DNA碱基损伤耐受性的两个独立但内在联系的方面。
PARP1 regulates the repair of DNA single-strand breaks generated directly, or during base excision repair (BER). However, the role of PARP2 in these and other repair mechanisms is unknown. Here, we report a requirement for PARP2 in stabilising replication forks that encounter BER intermediates through Fbh1-dependent regulation of Rad51. Whereas PARP2 is dispensable for tolerance of cells to SSBs or homologous recombination dysfunction, it is redundant with PARP1 in BER. Therefore, combined disruption of PARP1 and PARP2 leads to defective BER, resulting in elevated levels of replication-associated DNA damage owing to an inability to stabilise Rad51 at damaged replication forks and prevent uncontrolled DNA resection. Together, our results demonstrate how PARP1 and PARP2 regulate two independent, but intrinsically linked aspects of DNA base damage tolerance by promoting BER directly, and by stabilising replication forks that encounter BER intermediates.
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