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Frequency-dependent selection in human immunodeficiency virus type 1.

Eloisa Yuste1, Andrés Moya2, Cecilio López-Galíndez1

  • 1Servicio de Virología Molecular, Centro Nacional de Biología Fundamental, Instituto de Salud Carlos III, Majadahonda, 28220 Madrid, Spain1.

The Journal of General Virology
|December 26, 2001
PubMed
Summary
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RNA viruses evolve through genetic variation and competition. This study shows that variant frequency impacts which virus strain becomes dominant, suggesting frequency-dependent selection is key to viral evolution and heterogeneity.

Area of Science:

  • Virology
  • Evolutionary Biology
  • Genetics

Background:

  • Genetic variation is a primary evolutionary mechanism for RNA viruses and retroviruses.
  • Viral evolution involves competition, where the fittest variants typically dominate.
  • The frequency of competing viral variants may influence evolutionary dynamics.

Purpose of the Study:

  • To investigate how the competing proportions of viral variants affect evolutionary outcomes.
  • To determine if frequency-dependent selection (FDS) plays a role in viral competition.

Main Methods:

  • Individual virus populations from a human immunodeficiency virus type 1 (HIV-1) isolate were studied.
  • Experiments involved varying the proportions of competing viral variants.
  • The dynamics of variant imposition were analyzed to detect selection patterns.

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Main Results:

  • Competition experiments revealed frequency-dependent selection (FDS).
  • The imposition of viral variants was directly related to their biological fitness and competing proportions.
  • Variant success was not solely determined by inherent fitness but also by its frequency relative to competitors.

Conclusions:

  • Frequency-dependent selection is a significant factor in the evolution of human immunodeficiency virus type 1.
  • The findings suggest that FDS may be a general mechanism promoting genetic heterogeneity in RNA viruses.
  • Understanding FDS is crucial for comprehending viral evolution and developing effective antiviral strategies.