Cited by 318DNA Repair MechanismsCancer-related Molecular PathwaysMicrotubule and mitosis dynamics

Distinct but Concerted Roles of ATR, DNA-PK, and Chk1 in Countering Replication Stress during S Phase

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Buisson, Rémi, Boisvert, Jessica L., Benes, Cyril H., Zou, Lee·2015·Molecular Cell

Abstract

The ATR-Chk1 pathway is critical for DNA damage responses and cell-cycle progression. Chk1 inhibition is more deleterious to cycling cells than ATR inhibition, raising questions about ATR and Chk1 functions in the absence of extrinsic replication stress. Here we show that a key role of ATR in S phase is to coordinate RRM2 accumulation and origin firing. ATR inhibitor (ATRi) induces massive ssDNA accumulation and replication catastrophe in a fraction of early S-phase cells. In other S-phase cells, however, ATRi induces moderate ssDNA and triggers a DNA-PK and Chk1-mediated backup pathway to suppress origin firing. The backup pathway creates a threshold such that ATRi selectively kills cells under high replication stress, whereas Chk1 inhibitor induces cell death at a lower threshold. The levels of ATRi-induced ssDNA correlate with ATRi sensitivity in a panel of cell lines, suggesting that ATRi-induced ssDNA could be predictive of ATRi sensitivity in cancer cells.

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Authors
Buisson, R., Boisvert, J. L., Benes, C. H., & Zou, L.
Affiliations
Harvard University (US)
Corresponding author
Zou, Lee
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2015-09
Volume
59
Issue
6
Pages
1011-1024
ISSN
1097-2765 (ISSN-L)
OpenAlex
W1855851918
Cited by
316
References
72
Citations by year
2026: 27 · 2025: 14 · 2024: 16 · 2023: 27 · 2022: 33 · 2021: 37 · 2020: 38 · 2019: 30 · 2018: 38 · 2017: 29 · 2016: 25 · 2015: 2
FWCI
13.61
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • Wellcome Trust (102696)
  • National Institute of General Medical Sciences (R01GM076388, GM076388)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Microtubule and mitosis dynamics
Keywords
ATR, DNA-dependent protein kinase, Chk1, replication stress, S phase, DNA damage response, RRM2, replication origin firing, single-stranded DNA, replication catastrophe, cancer cell lines
MeSH terms
Checkpoint Kinase 1, DNA Damage, DNA Replication, DNA, Single-Stranded, Humans, Nuclear Proteins, Phosphorylation, Protein Kinases, Protein Processing, Post-Translational, Ribonucleoside Diphosphate Reductase, Stress, Physiological, S Phase, Replication Origin, Cell Line, Tumor, DNA-Activated Protein Kinase, Ataxia Telangiectasia Mutated Proteins

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