Temporal dynamics of 'HoBi'-like pestivirus quasispecies in persistently infected calves generated under experimental conditions.
'HoBi'-like virus is an atypical group within the Pestivirus genus that is implicated in economic losses for cattle producers due to both acute and persistent infections. Pestivirus strains exist as quasispecies (swarms of individual viruses) in infected animals and the viral populations making up the quasispecies differ widely in size and diversity in each animal. In the present study the viral quasispecies circulating in persistently infected (PI) calves, generated and maintained under experimental conditions using two different 'HoBi'-like strains, was observed over time. An increase in genetic variability and the development of certain mutations was observed over time. Mutations observed included the loss of a putative N-linked glycosylation site in the E2 region and the change of specific residues in E1/E2. It is hypothesized that these changes may be the results on continued adaption of the pestivirus to individual hosts. This is the first study characterizing variation in the viral swarms of animals persistently infected with HoBi-like viruses over time. Studies of the shifts in PI viral swarms will contribute to our understanding of the host and viral mechanisms that function in the maintenance of pestivirus persistent infections.
Laboratório de Virologia, Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9090, CEP 91-540-000, Porto Alegre, Rio Grande do Sul, Brazil.
Matheus N
MN
Weber
Ruminant Diseases and Immunology Research Unit, Agricultural Research Service (ARS), National Animal Disease Center (NADC), United States Department of Agriculture (USDA), 1920 Dayton Av., Zip Code 50010, Ames, IA, United States.
Fernando V
FV
Bauermann
Laboratório de Virologia, Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9090, CEP 91-540-000, Porto Alegre, Rio Grande do Sul, Brazil.
Cláudio W
CW
Canal
Ruminant Diseases and Immunology Research Unit, Agricultural Research Service (ARS), National Animal Disease Center (NADC), United States Department of Agriculture (USDA), 1920 Dayton Av., Zip Code 50010, Ames, IA, United States.
Darrell O
DO
Bayles
Ruminant Diseases and Immunology Research Unit, Agricultural Research Service (ARS), National Animal Disease Center (NADC), United States Department of Agriculture (USDA), 1920 Dayton Av., Zip Code 50010, Ames, IA, United States.
John D
JD
Neill
Ruminant Diseases and Immunology Research Unit, Agricultural Research Service (ARS), National Animal Disease Center (NADC), United States Department of Agriculture (USDA), 1920 Dayton Av., Zip Code 50010, Ames, IA, United States. Electronic address: julia.ridpath@ars.usda.gov.
Julia F
JF
Ridpath
D000595:Amino Acid Sequence; D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000821:virology*; D014644:Genetic Variation; D010576:Pestivirus / Q000145:classification* / Q000235:genetics*; D018182:Pestivirus Infections / Q000662:veterinary*; D010802:Phylogeny; D000074704:Quasispecies; D012367:RNA, Viral; D017422:Sequence Analysis, DNA; D014764:Viral Proteins / Q000235:genetics / Q000276:immunology
D012367:RNA, Viral; D014764:Viral Proteins
Persistent infection; Pestivirus; Quasispecies; ‘HoBi’-like