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Isolation of Fidelity Variants of RNA Viruses and Characterization of Virus Mutation Frequency
Published on: June 16, 2011
Positive selection of synonymous mutations in vesicular stomatitis virus
I S Novella1, S Zárate, D Metzgar
1Department of Microbiology and Immunology, Medical College of Ohio, Toledo, OH 43614 USA. isabel@mco.edu
Journal of Molecular Biology
|September 15, 2004
Summary
Silent mutations significantly aid RNA virus adaptation, challenging traditional evolutionary analysis. Parallel evolution in these viruses highlights the adaptive role of seemingly neutral genetic changes.
Area of Science:
- Virology
- Evolutionary Biology
- Genetics
Background:
- Evolutionary forces are often inferred from synonymous and non-synonymous mutations.
- Neutrality is typically assumed when no amino acid change occurs.
Purpose of the Study:
- To investigate the role of mutations, particularly silent ones, in viral evolution under positive selection.
- To determine if silent mutations contribute to viral adaptation.
Main Methods:
- Sequencing of ten vesicular stomatitis virus populations.
- Analysis of mutations occurring during evolution under positive selection.
- Identification of parallel evolution events in coding and non-coding regions.
Main Results:
- A significant number of mutations occurred independently across multiple strains (parallel evolution).
- A substantial fraction of these parallel mutations were silent (synonymous).
- Parallel evolution was also observed in non-coding regions.
Conclusions:
- Silent mutations can play a significant role in the adaptation of RNA viruses.
- The relative frequencies of synonymous and non-synonymous substitutions may not be reliable for reconstructing viral evolutionary history.
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