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Related Experiment Videos

Basic concepts in RNA virus evolution

E Domingo1, C Escarmís, N Sevilla

  • 1Centro de Biología Molecular "Severo Ochoa" Universidad Autónoma, Madrid, Spain.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|June 1, 1996
PubMed
Summary

RNA viruses evolve rapidly due to error-prone replication, lacking proofreading. Genetic bottlenecks amplify negative effects, influencing viral population dynamics and adaptability.

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Area of Science:

  • Virology
  • Evolutionary Biology
  • Population Genetics

Background:

  • RNA genomes replicate with low fidelity due to absent proofreading and error correction mechanisms.
  • Despite low fidelity, RNA virus population dynamics align with established population genetics principles.

Purpose of the Study:

  • To review evidence on genetic bottlenecks' impact on RNA virus evolution.
  • To examine the Red Queen hypothesis and competitive exclusion principle in RNA viruses.

Main Methods:

  • Review of recent evidence on genetic bottlenecks.
  • Analysis of viral quasispecies dynamics.
  • Synthesis of functional and structural studies on virus variation.

Main Results:

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  • Genetic bottlenecks significantly enhance Muller's ratchet effects in RNA virus evolution.
  • RNA viruses exhibit high adaptability, with fitness varying greatly over short periods.
  • Despite adaptability, RNA virus variation is constrained, occupying narrow sequence spaces.

    • Conclusions:

    • RNA virus evolution is shaped by error-prone replication and genetic bottlenecks.
    • Viral quasispecies dynamics support the Red Queen hypothesis and competitive exclusion.
    • RNA virus adaptability is a paradoxically narrow occupation of sequence space.