Cited by 113DNA Repair MechanismsEffects of Radiation ExposurePARP inhibition in cancer therapy

RAD51 is involved in repair of damage associated with DNA replication in mammalian cells

Lundin, Cecilia, Schultz, Niklas, Arnaudeau, Catherine, Mohindra, Atul, Hansen, Lasse Tengbjerg, Helleday, Thomas·2003·Journal of Molecular Biology

Abstract

The RAD51 protein, a eukaryotic homologue of the Escherichia coli RecA protein, plays an important role in the repair of DNA double-strand breaks (DSBs) by homologous recombination (HR) in mammalian cells. Recent findings suggest that HR may be important in repair following replication arrest in mammalian cells. Here, we have investigated the role of RAD51 in the repair of different types of damage induced during DNA replication with etoposide, hydroxyurea or thymidine. We show that etoposide induces DSBs at newly replicated DNA more frequently than gamma-rays, and that these DSBs are different from those induced by hydroxyurea. No DSB was found following treatment with thymidine. Although these compounds appear to induce different DNA lesions during DNA replication, we show that a cell line overexpressing RAD51 is resistant to all of them, indicating that RAD51 is involved in repair of a wide range of DNA lesions during DNA replication. We observe fewer etoposide-induced DSBs in RAD51-overexpressing cells and that HR repair of etoposide-induced DSBs is faster. Finally, we show that induced long-tract HR in the hprt gene is suppressed in RAD51-overexpressing cells, although global HR appears not to be suppressed. This suggests that overexpression of RAD51 prevents long-tract HR occurring during DNA replication. We discuss our results in light of recent models suggested for HR at stalled replication forks.

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Crossref · 10.1016/s0022-2836(03)00313-9

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Authors
Lundin, C., Schultz, N., Arnaudeau, C., Mohindra, A., Hansen, L. T., & Helleday, T.
Affiliations
  • Stockholm University (SE)
  • University of Sheffield (GB)
  • University of Copenhagen (DK)
Corresponding author
Helleday, Thomas
Venue
Journal of Molecular Biology
Publisher
Elsevier BV
Published
2003-05
Volume
328
Issue
3
Pages
521-535
ISSN
0022-2836 (ISSN-L)
OpenAlex
W2052090116
Cited by
113
References
71
Citations by year
2026: 1 · 2024: 4 · 2023: 3 · 2022: 2 · 2021: 3 · 2020: 2 · 2019: 2 · 2018: 3 · 2017: 4 · 2016: 4 · 2015: 8 · 2014: 4 · 2013: 5 · 2012: 4
FWCI
3.79
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Molecular Biology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Stiftelsen Forska Utan Djurförsök
  • Cancerfonden
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
RAD51, homologous recombination, DNA double-strand break repair, replication arrest, etoposide, hydroxyurea, thymidine, HPRT gene, stalled replication forks
MeSH terms
Animals, Cell Line, DNA Damage, DNA Repair, DNA Replication, DNA-Binding Proteins, Dose-Response Relationship, Drug, Etoposide, Cricetinae, Hydroxyurea, Hypoxanthine Phosphoribosyltransferase, Kinetics, Models, Genetic, Recombination, Genetic, Thymidine, Apoptosis, Rad51 Recombinase

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