Cited by 263Telomeres, Telomerase, and SenescenceDNA Repair MechanismsDNA and Nucleic Acid Chemistry

Spontaneous occurrence of telomeric DNA damage response in the absence of chromosome fusions

Cesare, Anthony J, Kaul, Zeenia, Cohen, Scott B, Napier, Christine E, Pickett, Hilda A, Neumann, Axel A, Reddel, Roger R·2009·Nature Structural & Molecular Biology

Abstract

Telomere dysfunction is typically studied under conditions in which a component of the six-subunit shelterin complex that protects chromosome ends is disrupted. The nature of spontaneous telomere dysfunction is less well understood. Here we report that immortalized human cell lines lacking wild-type p53 function spontaneously show many telomeres with a DNA damage response (DDR), commonly affecting only one sister chromatid and not associated with increased chromosome end-joining. DDR(+) telomeres represent an intermediate configuration between the fully capped and uncapped (fusogenic) states. In telomerase activity-positive (TA(+)) cells, DDR is associated with low TA and short telomeres. In cells using the alternative lengthening of telomeres mechanism (ALT(+)), DDR is partly independent of telomere length, mostly affects leading strand-replicated telomeres, and can be partly suppressed by TRF2 overexpression. In ALT(+) (but not TA(+)) cells, DDR(+) telomeres preferentially associate with large foci of extrachromosomal telomeric DNA and recombination proteins. DDR(+) telomeres therefore arise through different mechanisms in TA(+) and ALT(+) cells and have different consequences.

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Crossref · 10.1038/nsmb.1725

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  • Telomeres may exist in three different states: fully capped or closed, intermediate, and fully uncapped.

    “Roger Reddel's group have suggested that telomeres may exist in three different states, providing an explanation to DNA damage signaling at telomeres that still contain shelterin proteins.”

    From Telomeres and cell senescence—size matters not (2017) · cites this paper as Cesare et al., 2009

  • In the fully capped state, telomeric repeats are sufficiently long that T-loop conformation is not compromised, and shelterin proteins inhibit NHEJ, preventing DDR activation.

    “The first state is the so-called fully capped or closed state, where telomeric repeats are sufficiently long such that the T-loop conformation is not compromised, and shelterin proteins inhibit NHEJ, preventing DDR activation.”

    From Telomeres and cell senescence—size matters not (2017) · cites this paper as Cesare et al., 2009

  • Extreme telomere shortening can disrupt the T-loop, causing DDR activation (fully uncapped), loss of shelterin proteins, and end-to-end fusions.

    “extreme telomere shortening can lead to disruption of the T-loop, causing DDR activation, a state also known as fully uncapped. In the latter, telomeric repeats have reached critical lengths such that there is a loss of shelterin proteins and NHEJ is no longer inhibited at telomeres, causing end-to-end fusions (Cesare et al., 2009).”

    From Telomeres and cell senescence—size matters not (2017) · cites this paper as Cesare et al., 2009

  • If T-loop conformation is lost, telomeres may adopt an intermediate state, activating a DDR without end-to-end fusions due to sufficient shelterin proteins.

    “if T-loop conformation is lost, telomeres may adopt an intermediate state, activating a DDR without leading to end-to-end fusions due to the presence of sufficient shelterin proteins.”

    From Telomeres and cell senescence—size matters not (2017) · cites this paper as Cesare et al., 2009

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Authors
Cesare, A. J., Kaul, Z., Cohen, S. B., Napier, C. E., Pickett, H. A., Neumann, A. A., & Reddel, R. R.
Affiliations
  • Children's Medical Research Institute (AU)
  • The University of Sydney (AU)
Corresponding author
Reddel, Roger R
Venue
Nature Structural & Molecular Biology
Published
2009-11-22
Volume
16
Issue
12
Pages
1244-1251
ISSN
  • 1545-9985 (ISSN-L)
  • 1545-9993
OpenAlex
W1966346464
Cited by
263
References
8
Citations by year
2026: 8 · 2025: 16 · 2024: 13 · 2023: 25 · 2022: 13 · 2021: 19 · 2020: 19 · 2019: 22 · 2018: 13 · 2017: 20 · 2016: 15 · 2015: 15 · 2014: 15 · 2013: 15 · 2012: 16
FWCI
7.73
Type
journal article
Language
en
Open access
closed
Locations
  • Nature Structural & Molecular Biology (publishedVersion)
  • PubMed (publishedVersion)
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
shelterin complex, TRF2, telomere dysfunction, telomerase, alternative lengthening of telomeres, chromosome fusion, p53 deficiency, telomere length, sister chromatids, telomere capping
MeSH terms
Cell Line, Chromosomes, Human, DNA Damage, Humans, Models, Biological, Telomere, Telomerase, Telomeric Repeat Binding Protein 2, Recombinases

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