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• W2890415599 abstract "The BRCA1 tumor suppressor preserves genome integrity through both homology-directed repair (HDR) and stalled fork protection (SFP). In vivo, BRCA1 exists as a heterodimer with the BARD1 tumor suppressor, and both proteins harbor a phosphate-binding BRCT domain. Here, we compare mice with mutations that ablate BRCT phospho-recognition by Bard1 (Bard1S563F and Bard1K607A) or Brca1 (Brca1S1598F). Brca1S1598F abrogates both HDR and SFP, suggesting that both pathways are likely impaired in most BRCA1 mutant tumors. Although not affecting HDR, the Bard1 mutations ablate poly(ADP-ribose)-dependent recruitment of BRCA1/BARD1 to stalled replication forks, resulting in fork degradation and chromosome instability. Nonetheless, Bard1S563F/S563F and Bard1K607A/K607A mice, unlike Brca1S1598F/S1598F mice, are not tumor prone, indicating that HDR alone is sufficient to suppress tumor formation in the absence of SFP. Nevertheless, because SFP, unlike HDR, is also impaired in heterozygous Brca1/Bard1 mutant cells, SFP and HDR may contribute to distinct stages of tumorigenesis in BRCA1/BARD1 mutation carriers." @default.
• W2890415599 created "2018-09-27" @default.
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• W2890415599 date "2018-10-01" @default.
• W2890415599 modified "2023-10-17" @default.
• W2890415599 title "The BRCT Domains of the BRCA1 and BARD1 Tumor Suppressors Differentially Regulate Homology-Directed Repair and Stalled Fork Protection" @default.
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• W2890415599 doi "https://doi.org/10.1016/j.molcel.2018.08.016" @default.
• W2890415599 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6347115" @default.
• W2890415599 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30244837" @default.
• W2890415599 hasPublicationYear "2018" @default.
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