Cited by 90Telomeres, Telomerase, and SenescenceDNA Repair MechanismsDNA and Nucleic Acid Chemistry

TRF2/RAP1 and DNA-PK mediate a double protection against joining at telomeric ends

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Bombarde, Oriane, Boby, Céline, Gomez, Dennis, Frit, Philippe, Giraud‐Panis, Marie‐Josèphe, Gilson, Eric, Salles, Bernard, Calsou, Patrick·2010·The EMBO Journal

Abstract

DNA-dependent protein kinase (DNA-PK) is a double-strand breaks repair complex, the subunits of which (KU and DNA-PKcs) are paradoxically present at mammalian telomeres. Telomere fusion has been reported in cells lacking these proteins, raising two questions: how is DNA-PK prevented from initiating classical ligase IV (LIG4)-dependent non-homologous end-joining (C-NHEJ) at telomeres and how is the backup end-joining (EJ) activity (B-NHEJ) that operates at telomeres under conditions of C-NHEJ deficiency controlled? To address these questions, we have investigated EJ using plasmid substrates bearing double-stranded telomeric tracks and human cell extracts with variable C-NHEJ or B-NHEJ activity. We found that (1) TRF2/RAP1 prevents C-NHEJ-mediated end fusion at the initial DNA-PK end binding and activation step and (2) DNA-PK counteracts a potent LIG4-independent EJ mechanism. Thus, telomeres are protected against EJ by a lock with two bolts. These results account for observations with mammalian models and underline the importance of alternative non-classical EJ pathways for telomere fusions in cells.

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  • TRF2 and RAP1 inhibit NHEJ at telomeres by preventing DNA-PK and inhibiting ligase-IV-mediated end joining.

    “TRF2 and RAP1 have been shown to inhibit NHEJ at telomeres by preventing the actions of DNA-PK, a double-stranded break repair complex protein, and also by inhibiting ligase-IV-mediated end joining (Bombarde et al., 2010).”

    From Telomeres and cell senescence—size matters not (2017) · cites this paper as Bombarde et al., 2010

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Authors
Bombarde, O., Boby, C., Gomez, D., Frit, P., Giraud‐Panis, M., Gilson, E., Salles, B., & Calsou, P.
Affiliations
Centre National de la Recherche Scientifique (FR)
Corresponding author
  • Salles, Bernard
  • Calsou, Patrick
Venue
The EMBO Journal
Published
2010-04-20
Volume
29
Issue
9
Pages
1573-1584
ISSN
  • 0261-4189 (ISSN-L)
  • 1460-2075
OpenAlex
W2100021953
Cited by
89
References
78
Citations by year
2026: 3 · 2025: 5 · 2024: 6 · 2023: 4 · 2022: 2 · 2021: 9 · 2020: 5 · 2019: 3 · 2018: 3 · 2017: 3 · 2016: 6 · 2015: 6 · 2014: 6 · 2013: 5 · 2012: 9
FWCI
6.06
Type
journal article
Language
en
Open access
Locations
  • The EMBO Journal (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
Funders
  • Institut National de la Santé et de la Recherche Médicale
  • Ligue Contre le Cancer
Topics
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • 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
Keywords
DNA-dependent protein kinase, DNA-PKcs, telomere fusion, telomere protection, non-homologous end joining, alternative non-homologous end joining, ligase IV, DNA double-strand break repair, telomeric DNA, Ku heterodimer
MeSH terms
DNA Ligase ATP, Shelterin Complex, DNA, DNA Repair, HeLa Cells, Humans, DNA Ligases, Telomere, Telomere-Binding Proteins, Telomeric Repeat Binding Protein 2, Genomic Instability, DNA-Activated Protein Kinase

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