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Is there a link between telomere maintenance and radiosensitivity?

Predrag Slijepcevic1

  • 1Brunel Institute of Cancer Genetics & Pharmacogenomics, Brunel University, Kingston Lane, Uxbridge, Middlesex, UB8 3PH, United Kingdom. Predrag.Slijepcevic@brunel.ac.uk

Radiation Research
|December 19, 2003
PubMed
Summary

Telomere maintenance alterations are linked to radiosensitivity across various human diseases and model systems. Further research is needed to fully understand this connection between telomere biology and radiation response.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Radiation Oncology

Background:

  • Radiosensitivity, the susceptibility of cells or organisms to radiation damage, is a critical factor in cancer treatment and radiation safety.
  • Telomeres, protective caps at the ends of chromosomes, play a vital role in maintaining genomic stability.
  • Dysregulation of telomere maintenance has been observed in several genetic disorders associated with increased radiosensitivity.

Purpose of the Study:

  • To investigate the potential of telomere maintenance as a genetic marker for radiosensitivity.
  • To review and synthesize evidence linking telomere alterations to radiosensitivity across diverse biological models.

Main Methods:

  • Literature review of studies examining telomere maintenance in human diseases and animal models with known radiosensitivity.

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  • Analysis of data from non-mammalian model systems (C. elegans, yeast) to explore conserved mechanisms.

    • Main Results:

    • Human diseases like ataxia telangiectasia, Nijmegen breakage syndrome, and Fanconi's anemia, all exhibiting radiosensitivity, show altered telomere maintenance.
    • Studies in breast cancer patients and human fibroblasts indicate a correlation between telomere length/maintenance and cellular radiosensitivity.
    • Radiosensitive mouse models (deficient in Ku, DNA-PKcs, Parp, Atm) and genetically engineered mice with dysfunctional telomeres display telomere alterations.
    • Evidence from C. elegans and yeast supports a conserved link between radiosensitivity and telomere maintenance.

    Conclusions:

    • Telomere maintenance appears to be a significant factor influencing radiosensitivity in mammals and other model organisms.
    • The findings suggest that telomere maintenance characteristics could serve as a potential predictive marker for radiation response.
    • Further investigation is warranted to elucidate the precise molecular mechanisms underlying the relationship between telomere maintenance and radiosensitivity.