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- W2055367037 abstract "The MRN complex is known to have a role in the cellular response to DNA double-strand breaks in mammals, particularly in damage signaling, checkpoint responses and homologous recombination. Now MRN is found to function in nonhomologous end joining during mouse class switch recombination. The Mre11–Rad50–NBS1 (MRN) complex has many roles in response to DNA double-strand breaks, but its functions in repair by nonhomologous end joining (NHEJ) pathways are poorly understood. We have investigated requirements for MRN in class switch recombination (CSR), a programmed DNA rearrangement in B lymphocytes that requires NHEJ. To this end, we have engineered mice that lack the entire MRN complex in B lymphocytes or that possess an intact complex that harbors mutant Mre11 lacking DNA nuclease activities. MRN deficiency confers a strong defect in CSR, affecting both the classic and the alternative NHEJ pathways. In contrast, absence of Mre11 nuclease activities causes a milder phenotype, revealing a separation of function within the complex. We propose a model in which MRN stabilizes distant breaks and processes DNA termini to facilitate repair by both the classical and alternative NHEJ pathways." @default.
- W2055367037 created "2016-06-24" @default.
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- W2055367037 date "2009-07-26" @default.
- W2055367037 modified "2023-10-12" @default.
- W2055367037 title "Multiple functions of MRN in end-joining pathways during isotype class switching" @default.
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- W2055367037 doi "https://doi.org/10.1038/nsmb.1639" @default.
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