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Related Experiment Videos

Virus evolution within patients increases pathogenicity.

Yoh Iwasa1, Franziska Michor, Martin A Nowak

  • 1Department of Biology, Faculty of Sciences, Kyushu University, Fukuoka 812-8581, Japan. yiwasacb@mbox.nc.kyushu-u.ac.jp

Journal of Theoretical Biology
|October 23, 2004
PubMed
Summary
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Viral evolution, including human immunodeficiency virus (HIV), hepatitis B virus (HBV), and hepatitis C virus (HCV), generally increases pathogenicity. Mathematical models show viruses evolve to reduce healthy cells and increase infection rates.

Area of Science:

  • Virology
  • Immunology
  • Mathematical Biology

Background:

  • Viruses like HIV, HBV, and HCV replicate inaccurately, creating diverse viral quasispecies.
  • This heterogeneity makes viruses susceptible to selection pressures within the host.

Purpose of the Study:

  • To investigate the direction of virus evolution in relation to pathogenicity.
  • To analyze the impact of virus-host immune system interactions on viral evolution.

Main Methods:

  • Utilized eight distinct mathematical models to simulate virus-immune system dynamics.
  • Examined virus-induced immune impairment and cross-reactive immune stimulation.

Main Results:

  • Virus evolution consistently drives increased pathogenicity across various models.

Related Experiment Videos

  • Demonstrated that viral evolution reduces uninfected cell abundance and elevates infection rates.
  • Observed a general trend of worsening disease progression due to viral evolution.

    • Conclusions:

    • Virus evolution inherently favors increased pathogenicity, negatively impacting host health.
    • Suggests a potential therapeutic strategy for HIV involving engineered non-pathogenic viral mutants.