Cited by 20DNA Repair MechanismsPARP inhibition in cancer therapyEffects of Radiation Exposure

The methyl methanesulfonate induced S-phase delay in XRCC1-deficient cells requires ATM and ATR

Brem, Reto, Fernet, Marie, Chapot, Brigitte, Hall, Janet·2008·DNA Repair

Abstract

X-ray repair cross-complementing 1 (XRCC1) is required for DNA single-strand break and base excision repair (BER) in human cells. XRCC1-deficient human cells show hypersensitivity to cell killing, increased genetic instability and a significant delay in S-phase progression after exposure to the alkylating agent methyl methanesulfonate (MMS). Using RNAi modulation of XRCC1 levels, we show here that this S-phase delay is associated with significantly increased levels of recombinational repair as visualized by Rad51 focus formation. Using ATM- and ATR-defective cells and an ATM specific kinase inhibitor we demonstrate for the first time that the MMS-induced S-phase checkpoint requires both ATM and ATR. This unique dependency is associated with phosphorylation of ATM/ATR downstream targets or effectors such as SMC1 and Chk1. These results support the hypothesis that after MMS-treatment, the presence of unresolved BER intermediates gives rise to lesions that activate both ATM and ATR and that during the consequent S-phase delay, such intermediates may be repaired by a recombinational pathway which involves the Rad51 protein.

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Crossref · 10.1016/j.dnarep.2008.02.002

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  • In XRCC1-deficient cells, MMS produces unresolved BER intermediates and turns on ATM- and ATR-dependent DDR pathways, including S-phase delay and phosphorylation of SMC1 at serine 966 and Chk1 at serine 345.

    “MMS induces unresolved BER intermediates in XRCC1-deficient cells and activates ATM and ATR-dependent DDR pathways, including S-phase delay and SMC1 (structural maintenance of chromosomes protein 1) phosphorylation at Serine 966 and Chk1 phosphorylation at Serine 345 [199]”

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Authors
Brem, R., Fernet, M., Chapot, B., & Hall, J.
Affiliations
  • Centre international de recherche sur le cancer (FR)
  • Inserm (FR)
Corresponding author
Hall, Janet
Venue
DNA Repair
Publisher
Elsevier BV
Published
2008-06
Volume
7
Issue
6
Pages
849-857
ISSN
  • 1568-7856 (ISSN-L)
  • 1568-7864
OpenAlex
W2094663394
Cited by
20
References
59
Citations by year
2024: 2 · 2021: 1 · 2019: 1 · 2015: 1 · 2014: 5 · 2013: 2 · 2012: 1
FWCI
0.96
Type
journal article
Language
en
Open access
closed
Locations
  • DNA repair (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Centre International de Recherche sur le Cancer
  • Electricité de France
  • National Institutes of Health
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Health Sciences › Medicine › Oncology › PARP inhibition in cancer therapy
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Effects of Radiation Exposure
Keywords
XRCC1, methyl methanesulfonate, S-phase checkpoint, ATM, ATR, base excision repair, single-strand breaks, recombinational repair, RAD51 foci, Chk1 phosphorylation, DNA damage response, alkylating agents, genomic instability
MeSH terms
X-ray Repair Cross Complementing Protein 1, DNA-Binding Proteins, Flow Cytometry, Fluorescent Antibody Technique, Humans, Methyl Methanesulfonate, Phosphorylation, Signal Transduction, S Phase, Protein Serine-Threonine Kinases, Cell Cycle Proteins, Tumor Suppressor Proteins, RNA Interference, Cell Line, Tumor, Ataxia Telangiectasia Mutated Proteins

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