Cited by 80DNA Repair MechanismsFungal and yeast genetics researchEffects of Radiation Exposure

ATR/Chk1 pathway is essential for resumption of DNA synthesis and cell survival in UV-irradiated XP variant cells

Despras, Emmanuelle, Daboussi, Fayza, Hyrien, Olivier, Marheineke, Kathrin, Kannouche, Patricia L.·2010·Human Molecular Genetics

Abstract

DNA polymerase eta (poleta) performs translesion synthesis past ultraviolet (UV) photoproducts and is deficient in cancer-prone xeroderma pigmentosum variant (XP-V) syndrome. The slight sensitivity of XP-V cells to UV is dramatically enhanced by low concentrations of caffeine. So far, the biological explanation for this feature remains elusive. Using DNA combing, we showed that translesion synthesis defect leads to a strong reduction in the number of active replication forks and a high proportion of stalled forks in human cells, which contrasts with budding yeast. Moreover, extensive regions of single-strand DNA are formed during replication in irradiated XP-V cells, leading to an over-activation of ATR/Chk1 pathway after low UVC doses. Addition of a low concentration of caffeine post-irradiation, although inefficient to restore S-phase progression, significantly decreases Chk1 activation and abrogates DNA synthesis in XP-V cells. While inhibition of Chk1 activity by UCN-01 prevents UVC-induced S-phase delay in wild-type cells, it aggravates replication defect in XP-V cells by increasing fork stalling. Consequently, UCN-01 sensitizes XP-V cells to UVC as caffeine does. Our findings indicate that poleta acts at stalled forks to resume their progression, preventing the requirement for efficient replication checkpoint after low UVC doses. In the absence of poleta, Chk1 kinase becomes essential for replication resumption by alternative pathways, via fork stabilization.

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Crossref · 10.1093/hmg/ddq046

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Authors
Despras, E., Daboussi, F., Hyrien, O., Marheineke, K., & Kannouche, P. L.
Affiliations
  • Université Paris-Sud (FR)
  • Centre National de la Recherche Scientifique (FR)
Corresponding author
Kannouche, Patricia L.
Venue
Human Molecular Genetics
Published
2010-02-01
Volume
19
Issue
9
Pages
1690-1701
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2150058269
Cited by
80
References
54
Citations by year
2026: 4 · 2025: 3 · 2023: 3 · 2022: 1 · 2021: 5 · 2020: 5 · 2019: 6 · 2018: 5 · 2017: 4 · 2016: 8 · 2015: 5 · 2014: 11 · 2013: 6 · 2012: 7
FWCI
2.61
Type
journal article
Language
en
Open access
closed
Locations
  • Human Molecular Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
  • HighWire Press Open Archive (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Effects of Radiation Exposure
Keywords
xeroderma pigmentosum variant, DNA polymerase eta, translesion synthesis, UV photoproducts, ATR-Chk1 pathway, replication fork stalling, S-phase checkpoint, S phase delay, UCN-01, UV-C irradiation, single-stranded DNA, DNA combing
MeSH terms
Checkpoint Kinase 1, Y-Family DNA Polymerases, Cell Line, DNA, DNA Damage, DNA-Directed DNA Polymerase, DNA Replication, Flow Cytometry, Humans, Protein Kinases, Transfection, Ultraviolet Rays, Xeroderma Pigmentosum, Blotting, Western, Signal Transduction, Protein Serine-Threonine Kinases, Cell Cycle Proteins, RNA, Small Interfering, Ataxia Telangiectasia Mutated Proteins

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