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Updated: Jul 15, 2026

Isolation of Fidelity Variants of RNA Viruses and Characterization of Virus Mutation Frequency
Published on: June 16, 2011
Insights into RNA virus mutant spectrum and lethal mutagenesis events: replicative interference and complementation
Celia Perales1, Roberto Mateo, Mauricio G Mateu
1Centro de Biología Molecular, Severo Ochoa CSIC-UAM, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.
Specific foot-and-mouth disease virus (FMDV) mutants interfere with wild-type RNA replication. This interference depends on mutant RNA levels and intracellular replication, supporting models of viral extinction through enhanced mutagenesis.
Area of Science:
- Virology
- Molecular Biology
- Genetics
Background:
- Viral RNA genome replication is influenced by interactions within quasispecies.
- Understanding these interactions is key to controlling viral populations.
Purpose of the Study:
- To investigate the interference effects of specific foot-and-mouth disease virus (FMDV) capsid and polymerase mutants on wild-type (wt) RNA replication.
- To determine the factors influencing this interference and its implications for viral quasispecies dynamics.
Main Methods:
- Co-electroporation of BHK-21 cells with wt FMDV RNA and excess mutant RNA.
- Quantification of wt RNA progeny production in the presence of mutants.
- Assessment of mutant RNA replication and infectious particle formation.
Main Results:
- Some FMDV mutants caused strong interference (<10% of wt progeny), while others showed no detectable interference.
- Interference required excess mutant RNA and intracellular replication, independent of infectious particle formation.
- Synergistic interference was observed with mixtures of capsid and polymerase mutants.
- Interference was specific to FMDV and did not affect encephalomyocarditis virus RNA.
Conclusions:
- Viral quasispecies composition significantly impacts population behavior.
- Results support the lethal defection model for viral extinction via enhanced mutagenesis.
- Interference mechanisms are complex and not solely dependent on known residue interactions.
Related Concept Videos
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Size and Structure of Viral Genomes
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