Cited by 109DNA Repair MechanismsEffects of Radiation ExposureCancer-related Molecular Pathways

An Imperfect G 2 M Checkpoint Contributes to Chromosome Instability Following Irradiation of S and G 2 Phase Cells

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Krempler, Andrea, Deckbar, Dorothee, Jeggo, Penny A., Lobrich, Markus·2007·Cell Cycle

Abstract

DNA double strand break (DSB) repair and checkpoint control represent two major mechanisms that function to reduce chromosomal instability following ionizing irradiation (IR). Ataxia telangiectasia (A-T) cells have long been known to have defective checkpoint responses. Recent studies have shown that they also have a DSB repair defect following IR raising the issue of how ATM's repair and checkpoint functions interplay to maintain chromosomal stability. A-T and Artemis cells manifest an identical and epistatic repair defect throughout the cell cycle demonstrating that ATM's major repair defect following IR represents Artemis-dependent end-processing. Artemis cells show efficient G(2)/M checkpoint induction and a prolonged arrest relative to normal cells. Following irradiation of G(2) cells, this checkpoint is dependent on ATM and A-T cells fail to show checkpoint arrest. In contrast, cells irradiated during S phase initiate a G(2)/M checkpoint which is independent of ATM and, significantly, both Artemis and A-T cells show a prolonged arrest at the G(2)/M checkpoint likely reflecting their repair defect. Strikingly, the G(2)/M checkpoint is released before the completion of repair when approximately 10-20 DSBs remain both for S phase and G(2) phase irradiated cells. This defined sensitivity level of the G(2)/M checkpoint explains the prolonged arrest in repair-deficient relative to normal cells and provides a conceptual framework for the cooperative phenotype between checkpoint and repair functions in maintaining chromosomal stability.

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  1. Riballo E, Kuhne M, Rief N, Doherty A, Smith GC, Recio MJ, Reis C, Dahm K, Fricke A, Krempler A, Parker AR, Jackson SP, Gennery A, Jeggo PA, Lobrich M. A pathway of double-strand break rejoining dependent upon ATM, Artemis, and proteins locating to gamma-H2AX foci. Mol Cell 2004; 16:715-24.
  2. Xu B, Kim ST, Lim DS, Kastan MB. Two molecularly distinct G Xu B, Kim ST, Lim DS, Kastan MB. Two molecularly distinct G Two molecularly distinct G 2 /M checkpoints are induced by ionizing irradiation. Mol Cell Biol 2002; 22:1049-59.
  3. Marples B, Wouters BG, Collis SJ, Chalmers AJ, Joiner MC. Low-dose hyper-radiosensitivi- ty: A consequence of ineffective cell cycle arrest of radiation-damaged G 2 -phase cells. Radiat Res 2004; 161:247-55.

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Authors
Krempler, A., Deckbar, D., Jeggo, P. A., & Lobrich, M.
Affiliations
  • Saarland University (DE)
  • University of Sussex (GB)
Venue
Cell Cycle
Published
2007-07-15
Volume
6
Issue
14
Pages
1682-1686
ISSN
  • 1538-4101 (ISSN-L)
  • 1551-4005
OpenAlex
W2054949155
Cited by
109
References
32
Citations by year
2026: 5 · 2025: 4 · 2024: 4 · 2022: 3 · 2021: 5 · 2020: 4 · 2019: 6 · 2018: 3 · 2017: 2 · 2016: 3 · 2015: 4 · 2014: 8 · 2013: 8 · 2012: 10
FWCI
0.75
Type
journal article
Language
en
Open access
Locations
  • Cell Cycle (publishedVersion)
  • PubMed (publishedVersion)
  • Sussex Research Online (University of Sussex) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
Funders
  • Wilhelm Sander-Stiftung
  • Deutsche Forschungsgemeinschaft (LO 677/4-1/2)
  • Bundesministerium für Bildung und Forschung (02S8335, 02S8355)
  • Medical Research Council
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Effects of Radiation Exposure
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
Keywords
G2/M checkpoint, chromosomal instability, ionizing radiation, DNA double-strand break repair, ATM, ataxia telangiectasia, Artemis, S-phase checkpoint, DNA end processing
MeSH terms
Cell Division, DNA, DNA Damage, DNA Repair, DNA-Binding Proteins, Endonucleases, Humans, Nuclear Proteins, Radiation, Ionizing, G2 Phase, S Phase, Protein Serine-Threonine Kinases, Cell Cycle Proteins, Tumor Suppressor Proteins, Chromosomal Instability, Ataxia Telangiectasia Mutated Proteins

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