Cited by 121DNA Repair MechanismsDNA and Nucleic Acid ChemistryFungal and yeast genetics research

Exo1 competes with repair synthesis, converts NER intermediates to long ssDNA gaps, and promotes checkpoint activation

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Giannattasio, Michele, Follonier, Cindy, Tourrière, Hélène, Puddu, Fabio, Lazzaro, Federico, Pasero, Philippe, Lopes, Massimo, Plevani, Paolo +1 more·2010·Molecular Cell

Abstract

Ultraviolet (UV) light induces DNA-damage checkpoints and mutagenesis, which are involved in cancer protection and tumorigenesis, respectively. How cells identify DNA lesions and convert them to checkpoint-activating structures is a major question. We show that during repair of UV lesions in noncycling cells, Exo1-mediated processing of nucleotide excision repair (NER) intermediates competes with repair DNA synthesis. Impediments of the refilling reaction allow Exo1 to generate extended ssDNA gaps, detectable by electron microscopy, which drive Mec1 kinase activation and will be refilled by long-patch repair synthesis, as shown by DNA combing. We provide evidence that this mechanism may be stimulated by closely opposing UV lesions, represents a strategy to redirect problematic repair intermediates to alternative repair pathways, and may also be extended to physically different DNA damages. Our work has significant implications for understanding the coordination between repair of DNA lesions and checkpoint pathways to preserve genome stability.

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Crossref · 10.1016/j.molcel.2010.09.004

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  • DNA polymerase κ directly participates in NER repair synthesis in human cells, and loss of TLS activity greatly potentiates the checkpoint response to UV in yeast G1 cells, suggesting closely opposing UV lesions may be at least partly responsible for checkpoint activation.

    “Interestingly, it was recently shown that DNA polymerase κ directly participates to NER repair synthesis in human cells [70,71] and that loss of TLS activity greatly potentiates the checkpoint response to UV irradiation in yeast G1 cells [61], suggesting that closely opposing UV lesions may indeed be at least partly responsible for checkpoint activation.”

    From Mind the gap: keeping UV lesions in check (2011) · cites this paper as [61]

  • G1 synchronized yeast mutants lacking TLS polymerases are more sensitive to UV than asynchronous cultures, while TLS-proficient strains are not.

    “Moreover, a role for TLS in G1-irradiated cells is also supported by the finding that G1 synchronized cultures of yeast mutants lacking TLS polymerases are more sensitive to UV light than asynchronous cultures, while this is not the case for strains that are TLS proficient [61].”

    From Mind the gap: keeping UV lesions in check (2011) · cites this paper as [61]

  • Translesion DNA polymerase activities seem to counteract the generation of the UV-induced checkpoint signal.

    “Interestingly, translesion DNA polymerase activities (TLS) seem to counteract the generation of the UV-induced checkpoint signal [61,69].”

    From Mind the gap: keeping UV lesions in check (2011) · cites this paper as [61]

  • Normal NER intermediates are not directly responsible for activating checkpoint kinases.

    “Recent work shed light on these problems, showing that normal NER-intermediates are not directly responsible for activating checkpoint kinases.”

    From Mind the gap: keeping UV lesions in check (2011) · cites this paper as [61]

  • In non-cycling yeast, full and prompt checkpoint activity after UV requires NER and also Exo1 nuclease activity.

    “In order to achieve a full and prompt checkpoint activity after UV irradiation in non cycling yeast cells, NER is necessary but not sufficient: in fact, the nuclease activity of Exo1 is also required [60,61].”

    From Mind the gap: keeping UV lesions in check (2011) · cites this paper as [61]

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Authors
Giannattasio, M., Follonier, C., Tourrière, H., Puddu, F., Lazzaro, F., Pasero, P., Lopes, M., Plevani, P., & Muzi-Falconi, M.
Affiliations
  • University of Milan (IT)
  • University of Zurich (CH)
  • Centre National de la Recherche Scientifique (FR)
Corresponding author
  • Plevani, Paolo
  • Muzi-Falconi, Marco
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2010-10
Volume
40
Issue
1
Pages
50-62
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2029361378
Cited by
121
References
51
Citations by year
2026: 7 · 2025: 6 · 2024: 4 · 2023: 1 · 2022: 6 · 2021: 4 · 2020: 3 · 2019: 5 · 2018: 6 · 2017: 13 · 2016: 11 · 2015: 7 · 2014: 12 · 2013: 16 · 2012: 6
FWCI
4.69
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
Keywords
EXO1, nucleotide excision repair, UV-induced DNA damage, DNA damage checkpoint, Mec1 kinase, single-stranded DNA gaps, repair synthesis, long-patch repair, DNA damage tolerance, genome stability, DNA combing, electron microscopy of DNA
MeSH terms
Cell Cycle, DNA Damage, DNA Repair, DNA, Fungal, DNA, Single-Stranded, Dose-Response Relationship, Radiation, Enzyme Activation, Exodeoxyribonucleases, Saccharomyces cerevisiae, Time Factors, Ultraviolet Rays, Chromosomes, Fungal, Gene Expression Regulation, Fungal, Protein Serine-Threonine Kinases, Saccharomyces cerevisiae Proteins, Genomic Instability, Intracellular Signaling Peptides and Proteins

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