Cited by 1,671DNA Repair MechanismsPARP inhibition in cancer therapyBRCA gene mutations in cancer

53BP1 Inhibits Homologous Recombination in Brca1-Deficient Cells by Blocking Resection of DNA Breaks

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Bunting, Samuel F., Callén, Elsa, Wong, Nancy, Chen, Hua-Tang, Polato, Federica, Gunn, Amanda, Bothmer, Anne, Feldhahn, Niklas +8 more·2010·Cell

Abstract

Defective DNA repair by homologous recombination (HR) is thought to be a major contributor to tumorigenesis in individuals carrying Brca1 mutations. Here, we show that DNA breaks in Brca1-deficient cells are aberrantly joined into complex chromosome rearrangements by a process dependent on the nonhomologous end-joining (NHEJ) factors 53BP1 and DNA ligase 4. Loss of 53BP1 alleviates hypersensitivity of Brca1 mutant cells to PARP inhibition and restores error-free repair by HR. Mechanistically, 53BP1 deletion promotes ATM-dependent processing of broken DNA ends to produce recombinogenic single-stranded DNA competent for HR. In contrast, Lig4 deficiency does not rescue the HR defect in Brca1 mutant cells but prevents the joining of chromatid breaks into chromosome rearrangements. Our results illustrate that HR and NHEJ compete to process DNA breaks that arise during DNA replication and that shifting the balance between these pathways can be exploited to selectively protect or kill cells harboring Brca1 mutations.

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Crossref · 10.1016/j.cell.2010.03.012

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  • Inactivation of 53BP1 restored homologous recombination to BRCA1-deficient cells.

    “Remarkably, inactivation of one of these nonhomologous end-joining factors, 53BP1, restored homologous recombination to BRCA1-deficient cells [76,77].”
  • BRCA1-deficient cells have homologous recombination defects due to an overactive nonhomologous end-joining pathway.

    “In particular, BRCA1-deficient cells have defects in homologous recombination due to an overactive nonhomologous end-joining pathway.”
  • Loss of 53BP1 partly rescues the HR defect from BRCA1 deficiency, but not the defect in BARD1-deficient cells.

    “Interestingly, even though depletion of 53BP1, an inhibitor of DNA end resection50, partially overcame the HR defect associated with BRCA1 deficiency (Extended Data Fig. 8h, i), it did not suppress the HR defect in BARD1 deficient cells (Extended Data Fig. 8j, k).”

    From BRCA1–BARD1 promotes RAD51-mediated homologous DNA pairing (2017) · cites this paper as [50]

  • 53BP1 and BRCA1 promote DSB signaling, and 53BP1 subsequently prevents DSB resection during HR.

    “Although it seems counterintuitive for USP7 to both promote and limit 53BP1 and BRCA1 accumulation at sites of DSBs, an explanation may come from the finding that while 53BP1 and BRCA1 promote DSB signaling, 53BP1 subsequently prevent DSB resection during HR (Bunting et al., 2010; Coleman and Greenberg, 2011).”

    From USP7 Is a Master Regulator of Genome Stability (2020) · cites this paper as Bunting et al., 2010

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Authors
Bunting, S. F., Callén, E., Wong, N., Chen, H.-T., Polato, F., Gunn, A., Bothmer, A., Feldhahn, N., Fernandez-Capetillo, O., Cao, L., Xu, X., Deng, C.-X., Finkel, T., Nussenzweig, M., Stark, J. M., & Nussenzweig, A.
Affiliations
  • National Institutes of Health (US)
  • Beckman Research Institute (US)
  • Rockefeller University (US)
  • Howard Hughes Medical Institute (US)
Corresponding author
Nussenzweig, André
Venue
Cell
Publisher
Elsevier BV
Published
2010-04
Volume
141
Issue
2
Pages
243-254
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2157899948
Cited by
1,671
References
67
Citations by year
2026: 44 · 2025: 87 · 2024: 105 · 2023: 84 · 2022: 105 · 2021: 121 · 2020: 122 · 2019: 116 · 2018: 121 · 2017: 112 · 2016: 117 · 2015: 93 · 2014: 117 · 2013: 143 · 2012: 87
FWCI
42.03
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Rutgers University Community Repository (Rutgers University) (submittedVersion)
Funders
  • Howard Hughes Medical Institute
  • Leukemia and Lymphoma Society
  • National Institutes of Health (Z99 CA999999)
  • National Cancer Institute (Z01BC010283, Z01BC010959, R01CA120954)
  • National Institute of Allergy and Infectious Diseases (R37AI037526, R01AI037526, AI037526)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Health Sciences › Medicine › Oncology › PARP inhibition in cancer therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › BRCA gene mutations in cancer
Keywords
53BP1, BRCA1 deficiency, homologous recombination, non-homologous end joining, DNA resection, complex chromosomal rearrangements, PARP inhibition, ATM signaling, single-stranded DNA, BRCA1 mutation, carcinogenesis
MeSH terms
Tumor Suppressor p53-Binding Protein 1, Animals, B-Lymphocytes, Chromosomal Proteins, Non-Histone, DNA Repair, DNA-Binding Proteins, Female, Humans, BRCA1 Protein, Genomic Instability, Intracellular Signaling Peptides and Proteins, Mice, DNA Breaks

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