Cited by 309Telomeres, Telomerase, and SenescenceEffects of Radiation ExposureDNA Repair Mechanisms

Telomere dysfunction impairs DNA repair and enhances sensitivity to ionizing radiation

Wong, Kwok-Kin, Chang, Sandy, Weiler, Sarah R., Ganesan, Shridar, Chaudhuri, Jayanta, Zhu, Chengming, Artandi, Steven E., Rudolph, Karl Lenhard +4 more·2000·Nature Genetics

Abstract

Telomeres are specialized nucleoprotein complexes that serve as protective caps of linear eukaryotic chromosomes. Loss of telomere function is associated with rampant genetic instability and loss of cellular viability and renewal potential. The telomere also participates in processes of chromosomal repair, as evidenced by the 'capture' or de novo synthesis of telomere repeats at double-stranded breaks and by the capacity of yeast telomeres to serve as repositories of essential components of the DNA repair machinery, particularly those involved in non-homologous end-joining (NHEJ). Here we used the telomerase-deficient mouse, null for the essential telomerase RNA gene (Terc), to assess the role of telomerase and telomere function on the cellular and organismal response to ionizing radiation. Although the loss of telomerase activity per se had no discernable impact on the response to ionizing radiation, the emergence of telomere dysfunction in late-generation Terc-/- mice imparted a radiosensitivity syndrome associated with accelerated mortality. On the cellular level, the gastrointestinal crypt stem cells and primary thymocytes showed increased rates of apoptosis, and mouse embryonic fibroblasts (MEFs) showed diminished dose-dependent clonogenic survival. The radiosensitivity of telomere dysfunctional cells correlated with delayed DNA break repair kinetics, persistent chromosomal breaks and cytogenetic profiles characterized by complex chromosomal aberrations and massive fragmentation. Our findings establish a intimate relationship between functionally intact telomeres and the genomic, cellular and organismal response to ionizing radiation.

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Crossref · 10.1038/79232

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  • Late generation Terc-deficient mice have an uncharacterized DSB repair defect.

    “Late generation Terc-deficient mice have an uncharacterized DSB repair defect (Wong et al., 2000”

    From DNA Repair, Genome Stability, and Aging (2005) · cites this paper as Wong et al., 2000

  • The severe degenerative tissue defects in late-generation telomerase-knockout mice are linked to impaired proliferation and increased apoptosis in cycling progenitor cells and to a self-renewal defect in tissue stem cells.

    “The severe degenerative tissue defects in the late-generation telomerase-knockout mice appear linked to impaired proliferation and increased apoptosis in cycling progenitor cells and to a selfrenewal defect in tissue stem cells.”

    From Telomeres and telomerase in cancer (2010) · cites this paper as [63]

  • Late-generation telomerase-knockout mice show a premature aging syndrome with hair graying, shortened survival, and impaired responses to acute and chronic stress.

    “Late-generation telomerase-knockout mice exhibit a premature aging syndrome characterized by hair graying, shortened survival and impaired responses to acute and chronic stress (63,77).”

    From Telomeres and telomerase in cancer (2010) · cites this paper as [63]

  • In mice, short telomeres reduce the threshold for disease from additional external or internal insults, including γ-irradiation and ER stress from misfolded proteins.

    “Indeed, in mouse models, short telomeres have been shown to lower the disease threshold to other exogenous and endogeneous damage, such as γ-irradiation119 and endoplasmic reticulum stress due to protein misfolding97 (Fig. 5a).”

    From The telomere syndromes (2012) · cites this paper as [119]

  • In mTERC-/- mouse cells, telomere dysfunction is a prominent trait that impairs DNA repair and enhances sensitivity to ionizing radiation.

    “Recent data suggest that in mTERC ±/± mouse cells telomere dysfunction is a prominent trait that impairs DNA repair and enhances sensitivity to ionizing radiation (Wong et al., 2000).”

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Authors
Wong, K.-K., Chang, S., Weiler, S. R., Ganesan, S., Chaudhuri, J., Zhu, C., Artandi, S. E., Rudolph, K. L., Gottlieb, G. J., Chin, L., Alt, F. W., & DePinho, R. A.
Affiliations
  • Dana-Farber Cancer Institute (US)
  • Brigham and Women's Hospital (US)
  • Harvard University (US)
  • Quest Diagnostics (United States) (US)
  • Howard Hughes Medical Institute (US)
Corresponding author
DePinho, Ronald A.
Venue
Nature Genetics
Published
2000-09
Volume
26
Issue
1
Pages
85-88
ISSN
  • 1061-4036 (ISSN-L)
  • 1546-1718
OpenAlex
W1538980175
Cited by
309
References
30
Citations by year
2026: 3 · 2025: 3 · 2024: 5 · 2023: 6 · 2022: 3 · 2021: 5 · 2020: 8 · 2019: 14 · 2018: 7 · 2017: 7 · 2016: 9 · 2015: 19 · 2014: 9 · 2013: 13 · 2012: 12
FWCI
12.03
Type
journal article
Language
en
Open access
closed
Locations
  • Nature Genetics (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01hd028317-05, 5r01hd034880-04, 5k08ar002104-04)
  • National Institute on Aging (K08AG001019)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (K08AR02104-01)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (R01HD34880, R01 HD28317)
Topics
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Effects of Radiation Exposure
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
Keywords
telomere dysfunction, telomerase, radiosensitivity, DNA repair, non-homologous end joining, chromosomal instability, chromosomal abnormalities, apoptosis, clonogenic survival, thymocytes, mouse embryonic fibroblasts
MeSH terms
Animals, Cell Nucleus, Cell Survival, Chromosome Aberrations, Chromosomes, DNA Repair, Dose-Response Relationship, Radiation, Fibroblasts, Genotype, Kinetics, Mice, Transgenic, Models, Genetic, Radiation Tolerance, Radiation, Ionizing, Thymus Gland, Time Factors, Telomere, Apoptosis, In Situ Nick-End Labeling, Mice, DNA Fragmentation

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