Foot-and-mouth disease virus low-fidelity polymerase mutants are attenuated

Foot-and-mouth disease virus low-fidelity polymerase mutants are attenuated Previous studies have shown that RNA viruses can be attenuated by either increased or decreased viral polymerase replication fidelity. Although foot-and-mouth disease virus (FMDV) high-fidelity RNA-dependent RNA polymerase (RdRp) variants with an attenuated phenotype have been isolated using mutagens, no FMDV mutant with a low-fidelity polymerase has been documented to date. Here, we describe the generation of several FMDV RdRp mutants using site-directed mutagenesis via a reverse genetic system. Mutation frequency assays confirmed that five rescued FMDV RdRp mutant populations had lower replication fidelity than the wild-type virus population, which allowed us to assess the effects of the change in replication fidelity on the virus phenotype. These low-fidelity FMDV RdRp mutants showed increased sensitivity to ribavirin or 5-fluorouracil (5-FU) treatment without a loss of growth capacity in cell cultures. In addition, decreased fitness and attenuated virulence were observed for the RdRp mutants with lower fidelity. Importantly, based on a quantitative analysis for fidelity and virulence, we concluded that lower replication fidelity is associated with a more attenuated virus phenotype. These results further contribute to our understanding of the replication fidelity of polymerases of RNA viruses and its relationship to virulence attenuation. Archives of Virology Springer Journals

Foot-and-mouth disease virus low-fidelity polymerase mutants are attenuated

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Springer Vienna
Copyright © 2014 by Springer-Verlag Wien
Biomedicine; Virology; Medical Microbiology; Infectious Diseases
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  • Viral error catastrophe by mutagenic nucleosides
    Anderson, JP; Daifuku, R; Loeb, LA
  • RNA virus mutations and fitness for survival
    Domingo, E; Holland, J
  • Evolution of foot-and-mouth disease virus
    Domingo, E; Escarmis, C; Baranowski, E; Ruiz-Jarabo, CM; Carrillo, E; Nunez, JI; Sobrino, F

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