期刊
ISCIENCE
卷 25, 期 1, 页码 -出版社
CELL PRESS
DOI: 10.1016/j.isci.2021.103676
关键词
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资金
- National Natural Science Foundation of China [31800648, 31640017, 32071409]
- Education Department Foundation of Heilongjiang Province [2020-KYYWF-0001, 2018-KYYWF-0100]
- Postdoctoral Scientific Research Developmental Fund of Heilongjiang [LBH-Q15144]
- International Cooperation Program of Qiqihar Medical University [QMSI2017GJ-01]
The Wiskott-Aldrich syndrome protein and SCAR homolog (WASH) is a protein present in the nucleus that regulates gene transcription and maintains nuclear organization. It has been found to interact with core factors involved in DNA repair and play a role in the recruitment of repair machinery to DNA double-stranded break sites. Loss of WASH leads to increased cell sensitivity to DNA damage and impairs DNA repair efficiency.
The Wiskott-Aldrich syndrome protein and SCAR homolog (WASH), an actin nucleation-promoting factor, is present in the nucleus where it regulates gene transcription and maintains nuclear organization. Here, we show that WASH interacts with core non-homologous end joining (NHEJ) factors including Ku70/Ku80 and DNA-PKcs, and Ku70/Ku80 is involved in the recruitment of WASH to the sites of DNA double-stranded break (DSB). WASH depletion leads to increased cell sensitivity and impa:-ed DNA repair capacity in response to etoposide-induced DSBs and reduces NHEJ efficiency. Mechanistically, we show that loss of WASH inhibits the phosphorylation of DNA-PKcs, H2AX, and KAP1 after DSB induction and reduces chromatin relaxation and the recruitment of several downstream NHEJ factors to DSBs. Moreover, WASH role in DSB repair deponds on its conserved C-terminal VCA domain and Arp32/3 activation. Our findings reveal a function and mechanistic insight for WASH in DNA DSB repair by the NHEJ pathway.
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