Break-induced ATR and Ddb1-Cul4(Cdt)² ubiquitin ligase-dependent nucleotide synthesis promotes homologous recombination repair in fission yeast.

Break-induced ATR and Ddb1-Cul4(Cdt)² ubiquitin ligase-dependent nucleotide synthesis promotes homologous recombination repair in fission yeast.
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断裂诱导的 ATR 和 Ddb1-Cul4(Cdt)² 泛素连接酶依赖性核苷酸合成促进裂殖酵母中的同源重组修复。

DOI:
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发表时间:
2010
影响因子:
10.5
通讯作者:
T. Humphrey
T. Humphrey
中科院分区:
生物学1区
文献类型:
--
作者:
J. Moss;Helen Tinline;Carol A. Walker;L. Folkes;M. Stratford;J. Hayles;K. Hoe;Dong;Han;S. Kearsey;O. Fleck;Christian Holmberg;O. Nielsen;T. Humphrey

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核苷酸合成是对DNA损伤的普遍反应,但这种反应如何促进DNA修复和细胞存活尚不清楚。在这里,我们建立了一个作用,DNA损伤诱导的核苷酸合成同源重组(HR)修复裂殖酵母。使用遗传筛选,我们发现Ddb 1-Cul 4(Cdt)²泛素连接酶复合物和核糖核苷酸还原酶(RNR)是DNA双链断裂(DSB)的HR修复所需的。Ddb 1-Cul 4(Cdt)²泛素连接酶复合物是降解裂殖酵母中RNR抑制剂Spd 1所必需的。因此,缺失spd 1(+)抑制了DNA损伤敏感性和与ddb 1(+)或cdt 2(+)缺失相关的降低的HR效率。此外,我们证明了核苷酸合成的作用,在突触后间隙填充切除的ssDNA末端在HR修复。最后,我们定义了Rad 3(ATR)在核苷酸合成和HR中的作用,通过增加Cdt 2核水平来响应DNA损伤。我们的研究结果支持了一个模型,其中断裂诱导的Rad 3和Ddb 1-Cul 4(Cdt)²泛素连接酶依赖性Spd 1降解和RNR激活促进了HR修复过程中突触后ssDNA间隙填充。
Nucleotide synthesis is a universal response to DNA damage, but how this response facilitates DNA repair and cell survival is unclear. Here we establish a role for DNA damage-induced nucleotide synthesis in homologous recombination (HR) repair in fission yeast. Using a genetic screen, we found the Ddb1-Cul4(Cdt)² ubiquitin ligase complex and ribonucleotide reductase (RNR) to be required for HR repair of a DNA double-strand break (DSB). The Ddb1-Cul4(Cdt)² ubiquitin ligase complex is required for degradation of Spd1, an inhibitor of RNR in fission yeast. Accordingly, deleting spd1(+) suppressed the DNA damage sensitivity and the reduced HR efficiency associated with loss of ddb1(+) or cdt2(+). Furthermore, we demonstrate a role for nucleotide synthesis in postsynaptic gap filling of resected ssDNA ends during HR repair. Finally, we define a role for Rad3 (ATR) in nucleotide synthesis and HR through increasing Cdt2 nuclear levels in response to DNA damage. Our findings support a model in which break-induced Rad3 and Ddb1-Cul4(Cdt)² ubiquitin ligase-dependent Spd1 degradation and RNR activation promotes postsynaptic ssDNA gap filling during HR repair.
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