ALBA protein complex reads genic R-loops to maintain genome stability in Arabidopsis

ALBA protein complex reads genic R-loops to maintain genome stability in Arabidopsis
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ALBA 蛋白复合物读取基因 R 环以维持拟南芥基因组稳定性

DOI:
10.1126/sciadv.aav9040
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发表时间:
2019-05
期刊:
影响因子:
13.6
通讯作者:
Qian Weiqiang
Qian Weiqiang
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Yuan Wei;Zhou Jincong;Tong Jinjin;Zhuo Wanqing;Wang Lishuan;Li Yan;Sun Qianwen;Qian Weiqiang

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AtALBA 1和AtALBA 2是基因R环阅读器。由DNA-RNA杂合体和置换的单链DNA组成的R环调节多种细胞过程。然而,细胞R环是如何被识别的仍然知之甚少。在这里,我们报告的进化保守的ALBA蛋白(AtALBA 1和AtALBA 2)作为基因的R-环读者在拟南芥中的发现。虽然AtALBA 1结合到DNA-RNA杂合体,但AtALBA 2在体外与R环中的单链DNA结合。在体内,这两种蛋白质相互作用并共定位在细胞核中,在那里它们以R环依赖的方式优先结合到具有活性表观遗传标记的基因区域。AtALBA 1或AtALBA 2的缺失导致植物对DNA损伤剂的超敏反应。alba突变体中DNA断裂的形成源自未保护的R环。我们的研究结果表明,AtALBA 1和AtALBA 2蛋白复合物是基因的R环阅读器在拟南芥基因组稳定性至关重要。
AtALBA1 and AtALBA2 are genic R-loop readers. The R-loop, composed of a DNA-RNA hybrid and the displaced single-stranded DNA, regulates diverse cellular processes. However, how cellular R-loops are recognized remains poorly understood. Here, we report the discovery of the evolutionally conserved ALBA proteins (AtALBA1 and AtALBA2) functioning as the genic R-loop readers in Arabidopsis. While AtALBA1 binds to the DNA-RNA hybrid, AtALBA2 associates with single-stranded DNA in the R-loops in vitro. In vivo, these two proteins interact and colocalize in the nucleus, where they preferentially bind to genic regions with active epigenetic marks in an R-loop–dependent manner. Depletion of AtALBA1 or AtALBA2 results in hypersensitivity of plants to DNA damaging agents. The formation of DNA breaks in alba mutants originates from unprotected R-loops. Our results reveal that the AtALBA1 and AtALBA2 protein complex is the genic R-loop reader crucial for genome stability in Arabidopsis.
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