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Molecular Basis of Genetic Variability in RNA Viruses

  • Jozef J. Bujarski
Chapter

Abstract

The variability of genome organization, so essential for RNA virus evolution, among more than 900 plant RNA viruses (56 genera) is enormous (Gibbs et al., 1997). In fact, the potential for variation of the RNA genome is so large, that a term of quasispecies was proposed to reflect the nature of RNA virus populations (Domingo et al., 1995, Eigen, 1993, 1996; Holland et al., 1992; Moya and Garcia-Arenal, 1995). This concept predicts that a single virus isolate is not a single RNA sequence but rather a mixture of mutant sequences averaging around a consensus sequence. The biological selection acts upon the quasispecies to allow variants with greatly improved fitness to arise and predominate in the population. When the host or other characteristics of the environment change, such shifts in selection pressure can be easily overcome by changing the predominant sequences of the RNA genome. The biological implications of the quasispecies nature of plant RNA viruses are profoundly instrumental for rapid viral adaptation to new environments.

Keywords

Plant Virus Alfalfa Mosaic Virus Brome Mosaic Virus Cowpea Chlorotic Mottle Virus Defective Interfere 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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