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Related Experiment Videos

Amplification mediated by polyomavirus large T antigen defective in replication

L St-Onge1, M Bastin

  • 1Department of Biochemistry, University of Sherbrooke, Quebec, Canada.

Journal of Virology
|August 1, 1993
PubMed
Summary

Polyomavirus large T antigen drives homologous recombination and DNA amplification in rat cells. However, its DNA binding ability alone doesn't trigger recombination, indicating a complex mechanism.

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Area of Science:

  • Molecular Biology
  • Virology
  • Genetics

Background:

  • Polyomavirus large T antigen (LT) is known to influence DNA recombination.
  • Previous studies showed LT promotes homologous recombination in rat cells with integrated viral DNA.
  • LT mutants deficient in viral DNA synthesis initiation still promote recombination.

Purpose of the Study:

  • To investigate the role of polyomavirus large T antigen in DNA amplification.
  • To determine if LT's DNA binding activity is sufficient for homologous recombination.
  • To further elucidate the mechanisms of LT-mediated genetic alterations.

Main Methods:

  • Utilizing a rat cell line with stably integrated viral DNA sequences, including the replication origin.
  • Expressing polyomavirus large T antigen in these cells.

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  • Analyzing homologous recombination and DNA amplification events.
  • Employing mutants of large T antigen with specific functional defects.

    • Main Results:

    • Large T antigen promotes DNA amplification independently of its viral DNA replication function.
    • Origin-specific DNA binding activity of large T antigen is insufficient to promote homologous recombination.
    • Both reciprocal and nonreciprocal recombination events are promoted by large T antigen.

    Conclusions:

    • Polyomavirus large T antigen's role in DNA amplification is separable from its replicative function.
    • Homologous recombination promotion by large T antigen requires more than just DNA binding.
    • Further research is needed to understand the precise molecular mechanisms of large T antigen in recombination and amplification.