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In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
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Related Experiment Video

Updated: May 4, 2026

Application of Laser Micro-irradiation for Examination of Single and Double Strand Break Repair in Mammalian Cells
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Hypoxia and DNA repair.

Peter M Glazer1, Denise C Hegan2, Yuhong Lu2

  • 1Department of Therapeutic Radiology, Yale School of Medicine, New Haven, Connecticut ; Department of Genetics, Yale School of Medicine, New Haven, Connecticut.

The Yale Journal of Biology and Medicine
|December 19, 2013
PubMed
Summary

Hypoxia, common in solid tumors, drives cancer progression by causing genetic instability through altered DNA repair. This genomic damage may create vulnerabilities for targeted cancer therapies.

Keywords:
BRCA1DNA repairMLH1epigeneticshomologous recombinationhypoxiamicroRNAsmismatch repairsilencing

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Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Hypoxia is a hallmark of solid tumors, influencing cell metabolism, growth, apoptosis, angiogenesis, and motility.
  • Hypoxia is increasingly recognized as a driver of cancer progression and therapeutic resistance.

Purpose of the Study:

  • To investigate the impact of tumor hypoxia on genetic instability.
  • To elucidate the mechanisms by which hypoxia alters DNA repair pathways.
  • To explore the therapeutic implications of hypoxia-induced DNA repair defects.

Main Methods:

  • Conducted extensive laboratory experiments to assess genetic instability under hypoxic conditions.
  • Analyzed alterations in key DNA repair pathways, including nucleotide excision repair, DNA mismatch repair, and homology-dependent repair.
  • Investigated the functional consequences of these alterations on cancer cell behavior.

Main Results:

  • Hypoxia was confirmed to induce significant genetic instability in cancer cells.
  • Specific DNA repair pathways, including nucleotide excision repair, DNA mismatch repair, and homology-dependent repair, were found to be altered by hypoxia.
  • These hypoxia-induced alterations in DNA repair contribute to cancer progression.

Conclusions:

  • Hypoxia is a critical factor in solid tumors that promotes cancer progression by compromising genomic integrity.
  • The DNA repair defects induced by hypoxia represent a potential vulnerability that can be exploited for novel cancer treatment strategies.