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An oncogene-induced DNA damage model for cancer development

Thanos D Halazonetis1, Vassilis G Gorgoulis, Jiri Bartek

  • 1Department of Molecular Biology and Department of Biochemistry, University of Geneva, CH-1205 Geneva, Switzerland. Thanos.Halazonetis@molbio.unige.ch

Science (New York, N.Y.)
|March 8, 2008
PubMed

Insights

Activated oncogenes cause DNA double-strand breaks (DSBs), leading to genomic instability in precancerous lesions and cancers. Impaired DNA damage response pathways, often via p53 mutations, allow cancer development.

Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Genetics

Background:

  • DNA double-strand breaks (DSBs) are a significant cellular challenge.
  • Activated oncogenes in precancerous lesions and cancers induce replication fork stalling and collapse, forming DSBs.
  • DSBs are implicated in the genomic instability characteristic of most human cancers.

Purpose of the Study:

  • To investigate the role of oncogene-induced DNA damage in cancer development.
  • To explore the connection between DNA double-strand breaks, genomic instability, and p53 pathway alterations in cancer.

Main Methods:

  • Experimental analysis of DNA damage response in precancerous lesions and cancers.
  • Investigation of oncogene-induced replication stress.
  • Assessment of p53 activation and its role in tumor suppression.

Main Results:

  • Activated oncogenes continuously generate DNA double-strand breaks (DSBs).
  • These DSBs contribute to genomic instability observed in cancers.
  • DSBs activate p53, acting as a barrier to tumor progression, but this barrier is often overcome by p53 mutations.

Conclusions:

  • Oncogene-induced DNA damage is a key driver of cancer's genomic instability.
  • The p53 pathway's role in responding to DSBs is crucial for preventing cancer.
  • Frequent p53 mutations facilitate cancer development by impairing the DNA damage response.

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