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• W2173350709 abstract "Purpose The aim of this study was to elucidate the impact of DNA damage response (DDR) proteins 53BP1 and BRCA1 on the double-strand break (DSB)-repair choice. This is important not only in order to understand the underlying mechanisms of DSB-repair pathway regulation but also to determine the therapeutic implications for BRCA1-associated tumors. Materials and methods Human tumor cell lines A549 and HeLa were used. Non-homologous end-joining (NHEJ) and homologous recombination (HR) were assessed using NHEJ and HR reporter constructs. Colocalization of HR-proteins RPA and RAD51 with 53BP1 was evaluated by confocal microscopy and 3D-analysis. Results We demonstrate a specific crosstalk between 53BP1 and BRCA1. While 53BP1 does not colocalize with RPA or RAD51 and prohibits the recruitment of BRCA1 to DSBs to stimulate NHEJ, BRCA1 promotes the 53BP1 displacement specifically in S/G2-phase to allow end-resection, initiating HR. HR-efficiency was restored in BRCA1-depleted cells upon additional 53BP1-knockdown. Further, we found that 53BP1-mediated end protection precedes BRCA1-dependent end-resection. Conclusion These results demonstrate that the interplay between 53BP1/NHEJ and BRCA1/HR is of great relevance for tumor treatment, as the 53BP1 status would be highly important for the treatment response of BRCA1-associated tumors." @default.
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• W2173350709 date "2016-05-01" @default.
• W2173350709 modified "2023-10-17" @default.
• W2173350709 title "Functional crosstalk between DNA damage response proteins 53BP1 and BRCA1 regulates double strand break repair choice" @default.
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• W2173350709 doi "https://doi.org/10.1016/j.radonc.2015.11.001" @default.
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