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High variability and rapid evolution of a nanovirus
Ioana Grigoras1, Tatiana Timchenko, Ana Grande-Pérez
1Institut des Sciences du Végétal, CNRS, Avenue de la Terrasse, Bât. 23, 91198 Gif sur Yvette, France.
Journal of Virology
|July 2, 2010
Summary
Faba bean necrotic stunt virus (FBNSV) exhibits high mutation frequencies, indicating rapid molecular evolution. This nanovirus evolves quickly, similar to other fast-evolving plant viruses.
Area of Science:
- Plant Virology
- Molecular Evolution
- Genomics
Background:
- Nanoviruses are multipartite single-stranded DNA (ssDNA) plant viruses causing significant crop diseases.
- Limited knowledge exists regarding the genetic variability and molecular evolution of Nanoviridae.
- Faba bean necrotic stunt virus (FBNSV) is a key nanovirus affecting leguminous crops.
Purpose of the Study:
- To investigate the genetic variability and molecular evolution of faba bean necrotic stunt virus (FBNSV).
- To determine the nucleotide substitution rate of FBNSV in both field and laboratory populations.
Main Methods:
- Analysis of mutation frequencies in a field population of FBNSV.
- Assessment of mutation frequencies in a laboratory-maintained FBNSV population.
- Long-term virus propagation (over 2 years) for nucleotide substitution rate determination.
Main Results:
- Mutation frequencies of 7.52 x 10(-4) and 5.07 x 10(-4) substitutions per nucleotide were observed in field and laboratory FBNSV populations, respectively.
- A high nucleotide substitution rate of 1.78 x 10(-3) substitutions per nucleotide per year was determined for FBNSV.
- FBNSV demonstrates a rapid molecular evolution rate compared to other ssDNA viruses.
Conclusions:
- FBNSV exhibits significant genetic variability and a high rate of molecular evolution.
- The findings position FBNSV, and Nanoviridae family, among the fastest-evolving ssDNA viruses.
- Understanding FBNSV evolution is crucial for managing diseases in leguminous crops.
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