RAD51 is involved in repair of damage associated with DNA replication in mammalian cells
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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BRCA1, BRCA2, and Rad51 are needed for HR-mediated DNA repair and replication fork maintenance.
“Besides BRCA1, BRCA2, and Rad51 are also required for HR-mediated DNA repair and replication fork maintenance [25, 26].”
From NER initiation factors, DDB2 and XPC, regulate UV radiation response by recruiting ATR and ATM kinases to DNA damage sites (2013) · cites this paper as [25]
BRCA1, BRCA2, and Rad51 participate in HR-mediated DNA repair and replication fork maintenance.
“BRCA1, BRCA2, and Rad51 are known to participate in HR-mediated DNA repair and replication fork maintenance [25, 26].”
From NER initiation factors, DDB2 and XPC, regulate UV radiation response by recruiting ATR and ATM kinases to DNA damage sites (2013) · cites this paper as [25]
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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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