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Esteban Domingo1,2, Celia Perales1,2,3

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Viral quasispecies are complex populations of mutant genomes. High mutation rates drive viral evolution but exceeding a limit causes extinction, forming the basis for lethal mutagenesis antiviral strategies.

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Area of Science:

  • Virology
  • Evolutionary Biology
  • Genetics

Background:

  • Viral quasispecies describe populations with numerous variant genomes.
  • High mutation rates continuously generate mutants, altering their frequencies during replication.
  • The quasispecies concept, originating from early life theories, redefines 'wild type' and viral adaptation.

Purpose of the Study:

  • To explain the viral quasispecies concept and its implications in virology.
  • To highlight the role of mutant spectra in viral adaptation and evolution.
  • To introduce lethal mutagenesis as an antiviral strategy based on mutation rate limits.

Main Methods:

  • Review of theoretical frameworks and experimental evidence for viral quasispecies.
  • Application of clonal analyses and deep sequencing methodologies.
  • Conceptual analysis of mutation rates, viral adaptation, and extinction thresholds.

Main Results:

  • Confirmed the presence of vast numbers of mutant genomes within viral populations.
  • Demonstrated the participation of these mutants in viral adaptive processes.
  • Established that high mutation rates, while essential for adaptation, have an upper limit for genomic information integrity.

Conclusions:

  • The quasispecies concept provides a framework for understanding RNA virus adaptability.
  • Exceeding the mutation rate threshold leads to viral extinction, a principle exploited in lethal mutagenesis.
  • Viral quasispecies are complex distributions of genomes acting as a unit of selection, particularly in RNA viruses.