期刊
DNA REPAIR
卷 8, 期 12, 页码 1363-1370出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.dnarep.2009.09.002
关键词
DNA damage response; DNA double-strand break repair; Chromosomal instability; MRE11/RAD50/NBS1 complex; RAD54; Cell cycle checkpoint
资金
- Netherlands Cancer Foundation [EUR 1999-1966, EMCR 2002-2734]
- Netherlands Genomics initiative/Netherlands Organization for Scientific Research (NWO)
- European Community [FI6R-CT-2003508842, LSHG-CT-2005-512113]
Nijmegen breakage syndrome (NBS) is characterized by genome instability and cancer predisposition. NBS patients contain a mutation in the NBS1 gene, which encodes the NBS1 component of the DNA double-strand break (DSB) response complex MRE11/RAD50/NBS1. To investigate the NBS phenotype in more detail, we combined the mouse mimic of the most common patient mutation (Nbs1(Delta B/Delta B)) with a Rad54 null mutation, which diminishes homologous recombination. Double mutant cells were particularly sensitive to treatments that cause single strand breaks (SSBs), presumably because these SSBs can be converted into detrimental DSBs upon passage of a replication fork. The persistent presence of nuclear RAD51 foci and increased levels of chromatid type breaks in metaphase spreads indicated that replication-associated DSBs are repaired inefficiently in the double mutant cells. We conclude that Nbs1 and Rad54 function cooperatively, but in separate pathways to counteract this type of DNA damage and discuss mechanistic implications of these findings. (C) 2009 Elsevier B.V. All rights reserved.
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