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RNA转录本如何协调DNA重组与修复。

How RNA transcripts coordinate DNA recombination and repair.

作者信息

McDevitt Shane, Rusanov Timur, Kent Tatiana, Chandramouly Gurushankar, Pomerantz Richard T

机构信息

Department of Medical Genetics and Molecular Biochemistry, Fels Institute for Cancer Research, Temple University Lewis Katz School of Medicine, Philadelphia, PA, 19140, USA.

出版信息

Nat Commun. 2018 Mar 15;9(1):1091. doi: 10.1038/s41467-018-03483-7.

Abstract

Genetic studies in yeast indicate that RNA transcripts facilitate homology-directed DNA repair in a manner that is dependent on RAD52. The molecular basis for so-called RNA-DNA repair, however, remains unknown. Using reconstitution assays, we demonstrate that RAD52 directly cooperates with RNA as a sequence-directed ribonucleoprotein complex to promote two related modes of RNA-DNA repair. In a RNA-bridging mechanism, RAD52 assembles recombinant RNA-DNA hybrids that coordinate synapsis and ligation of homologous DNA breaks. In an RNA-templated mechanism, RAD52-mediated RNA-DNA hybrids enable reverse transcription-dependent RNA-to-DNA sequence transfer at DNA breaks that licenses subsequent DNA recombination. Notably, we show that both mechanisms of RNA-DNA repair are promoted by transcription of a homologous DNA template in trans. In summary, these data elucidate how RNA transcripts cooperate with RAD52 to coordinate homology-directed DNA recombination and repair in the absence of a DNA donor, and demonstrate a direct role for transcription in RNA-DNA repair.

摘要

酵母中的遗传学研究表明,RNA转录本以依赖RAD52的方式促进同源性指导的DNA修复。然而,所谓的RNA-DNA修复的分子基础仍然未知。通过重组分析,我们证明RAD52作为一种序列导向的核糖核蛋白复合物直接与RNA合作,以促进RNA-DNA修复的两种相关模式。在RNA桥接机制中,RAD52组装重组RNA-DNA杂交体,协调同源DNA断裂的联会和连接。在RNA模板机制中,RAD52介导的RNA-DNA杂交体在DNA断裂处实现依赖逆转录的RNA到DNA序列转移,从而许可随后的DNA重组。值得注意的是,我们表明RNA-DNA修复的两种机制都由反式同源DNA模板的转录促进。总之,这些数据阐明了RNA转录本如何与RAD52合作,在没有DNA供体的情况下协调同源性指导的DNA重组和修复,并证明了转录在RNA-DNA修复中的直接作用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/029a/5854605/511c49c5930c/41467_2018_3483_Fig1_HTML.jpg

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