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RSC 和 SWI/SNF 染色质重塑因子在基因组切除修复中的不同作用。

Distinct roles for RSC and SWI/SNF chromatin remodelers in genomic excision repair.

机构信息

School of Molecular Biosciences, Washington State University, Pullman, Washington 99164, USA.

Center for Reproductive Biology, Washington State University, Pullman, Washington 99164, USA.

出版信息

Genome Res. 2021 Jun;31(6):1047-1059. doi: 10.1101/gr.274373.120. Epub 2021 May 17.

Abstract

Nucleosomes are a significant barrier to the repair of UV damage because they impede damage recognition by nucleotide excision repair (NER). The RSC and SWI/SNF chromatin remodelers function in cells to promote DNA access by moving or evicting nucleosomes, and both have been linked to NER in yeast. Here, we report genome-wide repair maps of UV-induced cyclobutane pyrimidine dimers (CPDs) in yeast cells lacking RSC or SWI/SNF activity. Our data indicate that SWI/SNF is not generally required for NER but instead promotes repair of CPD lesions at specific yeast genes. In contrast, mutation or depletion of RSC subunits causes a general defect in NER across the yeast genome. Our data indicate that RSC is required for repair not only in nucleosomal DNA but also in neighboring linker DNA and nucleosome-free regions (NFRs). Although depletion of the RSC catalytic subunit also affects base excision repair (BER) of -methylpurine (NMP) lesions, RSC activity is less important for BER in linker DNA and NFRs. Furthermore, our data indicate that RSC plays a direct role in transcription-coupled NER (TC-NER) of transcribed DNA. These findings help to define the specific genomic and chromatin contexts in which each chromatin remodeler functions in DNA repair, and indicate that RSC plays a unique function in facilitating repair by both NER subpathways.

摘要

核小体是修复 UV 损伤的一个重要障碍,因为它们阻碍核苷酸切除修复(NER)对损伤的识别。RSC 和 SWI/SNF 染色质重塑酶在细胞中通过移动或驱逐核小体来促进 DNA 进入,并且在酵母中都与 NER 有关。在这里,我们报告了在缺乏 RSC 或 SWI/SNF 活性的酵母细胞中,紫外线诱导的环丁烷嘧啶二聚体(CPD)的全基因组修复图谱。我们的数据表明,SWI/SNF 一般不需要 NER,但它可以促进特定酵母基因中 CPD 损伤的修复。相比之下,RSC 亚基的突变或缺失会导致酵母基因组中 NER 的普遍缺陷。我们的数据表明,RSC 不仅需要修复核小体 DNA,还需要修复相邻的连接 DNA 和无核小体区域(NFR)。尽管 RSC 催化亚基的耗竭也会影响 -甲基嘌呤(NMP)损伤的碱基切除修复(BER),但 RSC 活性对链接 DNA 和 NFR 中的 BER 并不重要。此外,我们的数据表明,RSC 在转录偶联的 NER(TC-NER)中发挥直接作用。这些发现有助于确定每个染色质重塑酶在 DNA 修复中发挥作用的特定基因组和染色质环境,并表明 RSC 在促进 NER 子途径的修复方面发挥着独特的作用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b81f/8168587/28749930e5c1/1047f01.jpg

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