Cited by 313DNA Repair MechanismsEffects of Radiation ExposurePARP inhibition in cancer therapy

The controlling role of ATM in homologous recombinational repair of DNA damage

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Morrison, Ciaran, Sonoda, Eiichiro, Takao, Noriaki, Shinohara, Akira, Yamamoto, Ken‐ichi, Takeda, Shunichi·2000·The EMBO Journal

Abstract

The human genetic disorder ataxia telangiectasia (A-T), caused by mutation in the ATM gene, is characterized by chromosomal instability, radiosensitivity and defective cell cycle checkpoint activation. DNA double-strand breaks (dsbs) persist in A-T cells after irradiation, but the underlying defect is unclear. To investigate ATM's interactions with dsb repair pathways, we disrupted ATM along with other genes involved in the principal, complementary dsb repair pathways of homologous recombination (HR) or non-homologous end-joining (NHEJ) in chicken DT40 cells. ATM(-/-) cells show altered kinetics of radiation-induced Rad51 and Rad54 focus formation. Ku70-deficient (NHEJ(-)) ATM(-/-) chicken DT40 cells show radiosensitivity and high radiation-induced chromosomal aberration frequencies, while Rad54-defective (HR(-)) ATM(-/-) cells show only slightly elevated aberration levels after irradiation, placing ATM and HR on the same pathway. These results reveal that ATM defects impair HR-mediated dsb repair and may link cell cycle checkpoints to HR activation.

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Authors
Morrison, C., Sonoda, E., Takao, N., Shinohara, A., Yamamoto, K., & Takeda, S.
Affiliations
  • Kyoto University (JP)
  • Kanazawa University (JP)
  • University of Chicago (US)
Corresponding author
Takeda, Shunichi
Venue
The EMBO Journal
Published
2000-02-01
Volume
19
Issue
3
Pages
463-471
ISSN
  • 0261-4189 (ISSN-L)
  • 1460-2075
OpenAlex
W2017297714
Cited by
312
References
76
Citations by year
2026: 6 · 2025: 1 · 2024: 10 · 2023: 2 · 2022: 8 · 2021: 6 · 2020: 9 · 2019: 8 · 2018: 9 · 2017: 9 · 2016: 1 · 2015: 12 · 2014: 9 · 2013: 8 · 2012: 15
FWCI
10.74
Type
journal article
Language
en
Update notices
erratum (2000-02-15)
Open access
Locations
  • The EMBO Journal (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Wellcome Trust
  • QIMR Berghofer Medical Research Institute
  • University of Cambridge
  • University of Sussex
  • Mochida Memorial Foundation for Medical and Pharmaceutical Research
  • Bayer Yakuhin
  • Medical Research Council
  • Japan Society for the Promotion of Science (CREST)
  • Core Research for Evolutional Science and Technology
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 › PARP inhibition in cancer therapy
Keywords
ATM kinase, ataxia telangiectasia, homologous recombination, non-homologous end joining, DNA double-strand break repair, radiosensitivity, chromosomal instability, cell cycle checkpoints, RAD51, Rad54, Ku70, DT40 cells, chromosomal abnormalities
MeSH terms
Ku Autoantigen, Animals, Ataxia Telangiectasia, Cell Division, Cell Line, Chickens, Chromosome Aberrations, DNA Damage, DNA Repair, DNA Helicases, DNA-Binding Proteins, Fluorescent Antibody Technique, Fungal Proteins, Humans, Nuclear Proteins, Radiation Tolerance, Recombination, Genetic, Immunoblotting, Protein Serine-Threonine Kinases, Gene Targeting, Cell Cycle Proteins, Tumor Suppressor Proteins, Saccharomyces cerevisiae Proteins, Avian Proteins, Antigens, Nuclear, DNA Repair Enzymes, Rad51 Recombinase, Ataxia Telangiectasia Mutated Proteins

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