Cited by 6DNA Repair MechanismsEffects of Radiation ExposurePARP inhibition in cancer therapy

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SNM1A is crucial for efficient repair of complex DNA breaks in human cells

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Abstract

DNA double-strand breaks (DSBs), such as those produced by radiation and radiomimetics, are amongst the most toxic forms of cellular damage, in part because they involve extensive oxidative modifications at the break termini. Prior to completion of DSB repair, the chemically modified termini must be removed. Various DNA processing enzymes have been implicated in the processing of these dirty ends, but molecular knowledge of this process is limited. Here, we demonstrate a role for the metallo-β-lactamase fold 5′−3′ exonuclease SNM1A in this vital process. Cells disrupted for SNM1A manifest increased sensitivity to radiation and radiomimetic agents and show defects in DSB damage repair. SNM1A is recruited and is retained at the sites of DSB damage via the concerted action of its three highly conserved PBZ, PIP box and UBZ interaction domains, which mediate interactions with poly-ADP-ribose chains, PCNA and the ubiquitinated form of PCNA, respectively. SNM1A can resect DNA containing oxidative lesions induced by radiation damage at break termini. The combined results reveal a crucial role for SNM1A to digest chemically modified DNA during the repair of DSBs and imply that the catalytic domain of SNM1A is an attractive target for potentiation of radiotherapy.

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Metadata

Authors
Swift, L. P., Lagerholm, B. C., Henderson, L. R., Ratnaweera, M., Baddock, H. T., Sengerova, B., Lee, S., Cruz-Migoni, A., Waithe, D., Renz, C., Ulrich, H. D., Newman, J. A., Schofield, C. J., & McHugh, P. J.
Affiliations
  • John Radcliffe Hospital (GB)
  • Åbo Akademi University (FI)
  • Institute of Molecular Biology (DE)
  • University of Oxford (GB)
Corresponding author
McHugh, Peter J.
Venue
Nature Communications
Published
2024-06-25
Volume
15
Issue
1
Pages
5392-5392
ISSN
2041-1723 (ISSN-L)
OpenAlex
W4399996483
Cited by
6
References
1
Citations by year
2026: 2 · 2025: 3 · 2024: 1
FWCI
0.81
Type
journal article
Language
en
Open access
Locations
  • Nature Communications (publishedVersion, cc-by)
  • Research Square (acceptedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Åbo Akademi University Research Portal (submittedVersion, cc-by)
  • UTUPub (University of Turku) (submittedVersion, cc-by)
  • RePEc: Research Papers in Economics (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
Cancer Research UK (CRUK/ A24759)
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
DNA double-strand break repair, DNA end resection, oxidative DNA damage, 5'-3' exonuclease, PIP box, poly(ADP-ribose), PCNA, radiosensitivity, radiomimetic agents, radiosensitization, chemically modified DNA
MeSH terms
DNA, DNA Repair, Exodeoxyribonucleases, Humans, Cell Cycle Proteins, Proliferating Cell Nuclear Antigen, DNA Repair Enzymes, DNA Breaks, Double-Stranded, Ubiquitination

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