Cited by 38DNA Repair MechanismsEffects of Radiation ExposurePARP inhibition in cancer therapy

BRCA1 and CtIP Are Both Required to Recruit Dna2 at Double-Strand Breaks in Homologous Recombination

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Hoa, Nguyen Ngoc, Kobayashi, Junya, Omura, Masato, Hirakawa, Mayumi, Yang, Soo-Hyun, Komatsu, Kenshi, Paull, Tanya T., Takeda, Shunichi +1 more·2015·PLOS ONE

Abstract

Homologous recombination plays a key role in the repair of double-strand breaks (DSBs), and thereby significantly contributes to cellular tolerance to radiotherapy and some chemotherapy. DSB repair by homologous recombination is initiated by 5' to 3' strand resection (DSB resection), with nucleases generating the 3' single-strand DNA (3'ssDNA) at DSB sites. Genetic studies of Saccharomyces cerevisiae demonstrate a two-step DSB resection, wherein CtIP and Mre11 nucleases carry out short-range DSB resection followed by long-range DSB resection done by Dna2 and Exo1 nucleases. Recent studies indicate that CtIP contributes to DSB resection through its non-catalytic role but not as a nuclease. However, it remains elusive how CtIP contributes to DSB resection. To explore the non-catalytic role, we examined the dynamics of Dna2 by developing an immuno-cytochemical method to detect ionizing-radiation (IR)-induced Dna2-subnuclear-focus formation at DSB sites in chicken DT40 and human cell lines. Ionizing-radiation induced Dna2 foci only in wild-type cells, but not in Dna2 depleted cells, with the number of foci reaching its maximum at 30 minutes and being hardly detectable at 120 minutes after IR. Induced foci were detectable in cells in the G2 phase but not in the G1 phase. These observations suggest that Dna2 foci represent the recruitment of Dna2 to DSB sites for DSB resection. Importantly, the depletion of CtIP inhibited the recruitment of Dna2 to DSB sites in both human cells and chicken DT40 cells. Likewise, a defect in breast cancer 1 (BRCA1), which physically interacts with CtIP and contributes to DSB resection, also inhibited the recruitment of Dna2. Moreover, CtIP physically associates with Dna2, and the association is enhanced by IR. We conclude that BRCA1 and CtIP contribute to DSB resection by recruiting Dna2 to damage sites, thus ensuring the robust DSB resection necessary for efficient homologous recombination.

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  • ATG7, DNA2, and NBN encode DNA damage repair proteins in the DNA damage response, including homology-directed repair and non-homologous end joining for double-strand breaks.

    “ATG7 is an autophagy-related protein [136] which can modulate p53-dependent cell cycle pathways during prolonged stress [78] and plays a critical role in homology-directed repair (HDR) of DSBs [46]. Similarly, DNA2 encodes a HDR DNA repair protein for repair of DSBs [62] and NBN encodes a non-homologous end joining (NHEJ) DNA repair protein for repair of DSBs [158].”

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Authors
Hoa, N. N., Kobayashi, J., Omura, M., Hirakawa, M., Yang, S.-H., Komatsu, K., Paull, T. T., Takeda, S., & Sasanuma, H.
Affiliations
  • Kyoto University (JP)
  • Howard Hughes Medical Institute (US)
Corresponding author
  • Takeda, Shunichi
  • Sasanuma, Hiroyuki
Venue
PLOS ONE
Published
2015-04-24
Volume
10
Issue
4
Pages
e0124495
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2043876753
Cited by
38
References
39
Citations by year
2024: 4 · 2023: 1 · 2022: 4 · 2021: 6 · 2020: 6 · 2019: 1 · 2018: 6 · 2017: 4 · 2016: 5 · 2015: 1
FWCI
2.32
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Institutional Repositories DataBase (IRDB) (submittedVersion, other-oa)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
  • Kyoto University Research Information Repository (Kyoto University) (submittedVersion, cc-by)
  • Kyoto University Research Information Repository (Kyoto University) (submittedVersion)
Funders
Japan Society for the Promotion of Science (26550025, 26241013)
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
BRCA1, CtIP, DNA2, homologous recombination, DNA double-strand break repair, DNA end resection, ionizing radiation, protein recruitment, Saccharomyces cerevisiae, DT40 cells, G2 phase
MeSH terms
Animals, Binding Sites, Carrier Proteins, Cell Line, Chickens, Chromosome Aberrations, DNA Helicases, Endodeoxyribonucleases, Enzyme Activation, Epistasis, Genetic, Humans, Mutation, Nuclear Proteins, Protein Binding, BRCA1 Protein, Protein Transport, Rad51 Recombinase, DNA Breaks, Double-Stranded, Gene Knock-In Techniques, Cell Cycle Checkpoints, Homologous Recombination

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