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• W2114860131 abstract "A transposon mutagenesis screen indicates that loss of 53BP1 expression rescues the clonal growth defect of BRCA1 null cells. 53BP1 deficiency is shown to abrogate the cell cycle arrest triggered in the absence of BRCA1 and to partially restore homologous recombination. The potential clinical implications of these findings are supported by the reduction of 53BP1 expression in sporadic triple-negative and BRCA-associated breast cancers. Germ-line mutations in breast cancer 1, early onset (BRCA1) result in predisposition to breast and ovarian cancer. BRCA1-mutated tumors show genomic instability, mainly as a consequence of impaired recombinatorial DNA repair. Here we identify p53-binding protein 1 (53BP1) as an essential factor for sustaining the growth arrest induced by Brca1 deletion. Depletion of 53BP1 abrogates the ATM-dependent checkpoint response and G2 cell-cycle arrest triggered by the accumulation of DNA breaks in Brca1-deleted cells. This effect of 53BP1 is specific to BRCA1 function, as 53BP1 depletion did not alleviate proliferation arrest or checkpoint responses in Brca2-deleted cells. Notably, loss of 53BP1 partially restores the homologous-recombination defect of Brca1-deleted cells and reverts their hypersensitivity to DNA-damaging agents. We find reduced 53BP1 expression in subsets of sporadic triple-negative and BRCA-associated breast cancers, indicating the potential clinical implications of our findings." @default.
• W2114860131 created "2016-06-24" @default.
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• W2114860131 date "2010-05-09" @default.
• W2114860131 modified "2023-10-18" @default.
• W2114860131 title "53BP1 loss rescues BRCA1 deficiency and is associated with triple-negative and BRCA-mutated breast cancers" @default.
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• W2114860131 doi "https://doi.org/10.1038/nsmb.1831" @default.
• W2114860131 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2912507" @default.
• W2114860131 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20453858" @default.
• W2114860131 hasPublicationYear "2010" @default.
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