Cited by 60DNA Repair MechanismsEffects of Radiation ExposureCarcinogens and Genotoxicity Assessment

UV-induced histone H2AX phosphorylation and DNA damage related proteins accumulate and persist in nucleotide excision repair-deficient XP-B cells

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Oh, Kyu-Seon, Bustin, Michael, Mazur, Sharlyn J., Appella, Ettore, Kraemer, Kenneth H.·2011·DNA Repair

Abstract

DNA double strand breaks (DSB) may be caused by ionizing radiation. In contrast, UV exposure forms dipyrimidine photoproducts and is not considered an inducer of DSB. We found that uniform or localized UV treatment induced phosphorylation of the DNA damage related (DDR) proteins H2AX, ATM and NBS1 and co-localization of γ-H2AX with the DDR proteins p-ATM, p-NBS1, Rad51 and FANCD2 that persisted for about 6h in normal human fibroblasts. This post-UV phosphorylation was observed in the absence of nucleotide excision repair (NER), since NER deficient XP-B cells (lacking functional XPB DNA repair helicase) and global genome repair-deficient rodent cells also showed phosphorylation and localization of these DDR proteins. Resolution of the DDR proteins was dependent on NER, since they persisted for 24h in the XP-B cells. In the normal and XP-B cells p53 and p21 was detected at 6h and 24h but Mdm2 was not induced in the XP-B cells. Post-UV induction of Wip1 phosphatase was detected in the normal cells but not in the XP-B cells. DNA DSB were detected with a neutral comet assay at 6h and 24h post-UV in the normal and XP-B cells. These results indicate that UV damage can activate the DDR pathway in the absence of NER. However, a later step in DNA damage processing involving induction of Wip1 and resolution of DDR proteins was not observed in the absence of NER.

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Authors
Oh, K.-S., Bustin, M., Mazur, S. J., Appella, E., & Kraemer, K. H.
Affiliations
  • National Cancer Institute (US)
  • National Institutes of Health (US)
Corresponding author
Kraemer, Kenneth H.
Venue
DNA Repair
Publisher
Elsevier BV
Published
2011-01-02
Volume
10
Issue
1
Pages
5-15
ISSN
  • 1568-7856 (ISSN-L)
  • 1568-7864
OpenAlex
W2025993893
Cited by
60
References
57
Citations by year
2026: 2 · 2025: 2 · 2024: 3 · 2023: 4 · 2022: 4 · 2021: 3 · 2020: 3 · 2019: 4 · 2018: 3 · 2017: 3 · 2016: 7 · 2015: 3 · 2014: 5 · 2013: 3 · 2012: 6
FWCI
1.82
Type
journal article
Language
en
Open access
Locations
  • DNA repair (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Institute on Aging
  • National Cancer Institute (ZIABC004517)
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
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Carcinogens and Genotoxicity Assessment
Keywords
UV-induced DNA damage, DNA double-strand breaks, DNA damage response, H2AX phosphorylation, ATM phosphorylation, NBS1, RAD51, FANCD2, nucleotide excision repair deficiency, XPB helicase, Wip1 phosphatase, p53, p21, MDM2, global genome repair
MeSH terms
Protein Phosphatase 2C, Animals, Cell Line, DNA Damage, DNA Repair, DNA-Binding Proteins, Fibroblasts, Histones, Humans, Mutation, Nuclear Proteins, Phosphoprotein Phosphatases, Phosphorylation, Time Factors, Ultraviolet Rays, Apoptosis, Protein Serine-Threonine Kinases, Cell Cycle Proteins, Fluorescent Antibody Technique, Indirect, Comet Assay, Tumor Suppressor Proteins, Mice, DNA Breaks, Double-Stranded, Ataxia Telangiectasia Mutated Proteins

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