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Antiviral effects of a transgenic RNA-dependent RNA polymerase

Jason Kerkvliet1, Louisa Papke, Moses Rodriguez

  • 1Department of Neurology, Mayo Clinic, 200 First St. SW, Rochester, MN 55905, USA.

Journal of Virology
|October 22, 2010
PubMed

Insights

Transgenic mice expressing RNA-dependent RNA polymerase 3D(pol) showed reduced viral loads and increased survival against multiple virus types. This suggests a host-based antiviral state, not direct viral interference, offering potential for new antiviral therapies.

Area of Science:

  • Virology
  • Immunology
  • Genetics

Background:

  • Theiler's murine encephalitis virus (TMEV) is a picornavirus.
  • RNA-dependent RNA polymerase 3D(pol) is a key enzyme in picornavirus replication.

Purpose of the Study:

  • To investigate the antiviral effects of transgenic expression of 3D(pol) against various viruses.
  • To elucidate the mechanism of action for 3D(pol)-mediated viral inhibition.

Main Methods:

  • Generation of 3D(pol) transgenic FVB mice.
  • Infection of transgenic and nontransgenic mice with a picornavirus, an alphaherpesvirus, and a rhabdovirus.
  • Quantification of viral loads and survival rates.
  • Measurement of basal interferon levels.

Main Results:

  • 3D(pol) transgenic mice exhibited significantly lower viral loads across all tested virus types.
  • Transgenic mice demonstrated prolonged survival following viral infections.
  • Basal interferon levels were elevated in 3D(pol) transgenic mice prior to infection.

Conclusions:

  • Transgenic 3D(pol) confers broad-spectrum antiviral protection against diverse viral families.
  • The mechanism involves inducing a host antiviral state, potentially via elevated interferon, rather than direct viral polymerase inhibition.
  • This finding opens avenues for developing novel host-directed antiviral therapies.

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