Journal
JOURNAL OF CELL SCIENCE
Volume 128, Issue 2, Pages 317-330Publisher
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jcs.159103
Keywords
DNA double-strand break; BRG1; Homologous recombination; RAD52; RAD51
Categories
Funding
- National Nature Science Foundation of China [31371313, 31371293, 81372288]
- Program for Introducing Talents to Universities [B07017]
- National Institute of Environmental Health Sciences [R01 ES018948]
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DNA double-strand breaks (DSBs) are a type of lethal DNA damage. The repair of DSBs requires tight coordination between the factors modulating chromatin structure and the DNA repair machinery. BRG1, the ATPase subunit of the chromatin remodelling complex Switch/Sucrose non-fermentable (SWI/SNF), is often linked to tumorigenesis and genome instability, and its role in DSB repair remains largely unclear. In the present study, we show that BRG1 is recruited to DSB sites and enhances DSB repair. Using DR-GFP and EJ5-GFP reporter systems, we demonstrate that BRG1 facilitates homologous recombination repair rather than nonhomologous end-joining (NHEJ) repair. Moreover, the BRG1-RAD52 complex mediates the replacement of RPA with RAD51 on single-stranded DNA (ssDNA) to initiate DNA strand invasion. Loss of BRG1 results in a failure of RAD51 loading onto ssDNA, abnormal homologous recombination repair and enhanced DSB-induced lethality. Our present study provides a mechanistic insight into how BRG1, which is known to be involved in chromatin remodelling, plays a substantial role in the homologous recombination repair pathway in mammalian cells.
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