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Emerging roles of DNA tumor viruses in cell proliferation: new insights into genomic instability

Patrizia Lavia1, Anna Maria Mileo, Antonio Giordano

  • 1Institute of Molecular Biology and Pathology, CNR National Research Council, Rome, Italy.

Oncogene
|October 7, 2003
PubMed

Insights

Viral oncoproteins from Adenovirus, HPV, and SV40 disrupt cell cycle and apoptosis, causing genomic instability. Their interaction with Ran GTPase uncouples cell division, linking viral infection to cancer progression.

Area of Science:

  • Molecular Biology
  • Virology
  • Oncology

Background:

  • Small DNA viruses encode oncoproteins (e.g., E1A, E1B, E6, E7, large T, small T antigens) that manipulate host cells.
  • These oncoproteins are critical in cancer development by disrupting cellular checkpoints and inducing genomic instability.
  • Oncogenic viral proteins interfere with both 'gatekeeper' (cell cycle, apoptosis) and 'caretaker' (DNA repair, mitosis) cellular functions.

Purpose of the Study:

  • To elucidate the mechanisms by which viral oncoproteins induce genomic instability.
  • To highlight the role of oncoprotein-host factor interactions in cellular transformation.
  • To identify potential targets for novel cancer prevention and therapeutic strategies.

Main Methods:

  • Review and synthesis of existing literature on viral oncoproteins and their cellular targets.
  • Focus on the physical interaction between viral oncoproteins (E1A, E7) and host factors (Ran GTPase).
  • Analysis of the consequences of these interactions on cell cycle control and genomic stability.

Main Results:

  • Viral oncoproteins disrupt cell cycle and apoptosis, leading to mitotic abnormalities and genomic instability.
  • Physical interaction between E1A/E7 and Ran GTPase was identified as a key mechanism.
  • This interaction uncouples the centrosome cycle from the cell cycle, directly linking viral infection to genomic instability.

Conclusions:

  • Viral oncoproteins are potent oncogenic factors that subvert host cell machinery to promote cancer.
  • The interaction with Ran GTPase is a critical step in viral-induced genomic instability and cellular transformation.
  • Understanding these viral strategies is essential for developing new anti-cancer therapies.

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