Longitudinal surveillance of porcine rotavirus b strains from the United States and Canada and in silico identification of antigenically important sites

Frances K. Shepherd, Fangzhou Chen, Marie R. Culhane, Michael P. Murtaugh, Douglas G. Marthaler

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Rotavirus B (RVB) is an important swine pathogen, but control and prevention strategies are limited without an available vaccine. To develop a subunit RVB vaccine with maximal effect, we characterized the amino acid sequence variability and predicted antigenicity of RVB viral protein 7 (VP7), a major neutralizing antibody target, from clinically infected pigs in the United States and Canada. We identified genotype-specific antigenic sites that may be antibody neutralization targets. While some antigenic sites had high amino acid functional group diversity, nine antigenic sites were completely conserved. Analysis of nucleotide substitution rates at amino acid sites (dN/dS) suggested that negative selection appeared to be playing a larger role in the evolution of the identified antigenic sites when compared to positive selection, and was identified in six of the nine conserved antigenic sites. These results identified important characteristics of RVB VP7 variability and evolution and suggest antigenic residues on RVB VP7 that are negatively selected and highly conserved may be good candidate regions to include in a subunit vaccine design due to their tendency to remain stable.

Original languageEnglish (US)
Article number64
JournalPathogens
Volume6
Issue number4
DOIs
StatePublished - Dec 2017

Bibliographical note

Publisher Copyright:
© 2017 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

  • Antigenic epitopes
  • Genetics
  • Rotavirus B virus
  • Swine
  • Vaccine

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