title: Analysis of molecular variation in porcine reproductive and respiratory syndrome virus in China between 2007 and 2012.
abstract: In the present study, 89 porcine reproductive and respiratory syndrome virus (PRRSV) isolates in China during 2007 to 2012 were randomly selected from the GenBank genetic sequence database. Evolutionary characteristics of these isolates were analyzed based on the sequences of non-structural protein 2 (Nsp2) and glycoprotein 5 (GP5). The genetic variations of the isolates were also compared with six representative strains. The results showed that a high degree of genetic diversity exists among the PRRSV population in China. Highly pathogenic PRRSV isolates, with a discontinuous deletion of a 30 amino acid residue in the Nsp2 region, remained the most dominant virus throughout 2007-2012 in China. Owing to the extensive use of representative vaccine strains, natural recombination events occurred between strains. Three isolates - HH08, DY, and YN-2011 - were more closely related to vaccine strains than the other isolates. Both YN-2011 and DY were the evolutionary products of recombination events between strains SP and CH-1R. The results of the present study provide useful information for the epidemiology of PRRSV as well as for vaccine development.
authors.affiliation: Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, Changchun, 130062, Jilin, China.
authors.forename: Yuhang
authors.initials: Y
authors.lastname: Cao
authors.forename: Hongsheng
authors.initials: H
authors.lastname: Ouyang
authors.forename: Mingjun
authors.initials: M
authors.lastname: Zhang
authors.forename: Fuwang
authors.initials: F
authors.lastname: Chen
authors.forename: Xin
authors.initials: X
authors.lastname: Yang
authors.forename: Daxing
authors.initials: D
authors.lastname: Pang
authors.forename: Linzhu
authors.initials: L
authors.lastname: Ren
mesh_terms: D000818:Animals; D002681:China; D019316:Porcine respiratory and reproductive syndrome virus / Q000235:genetics* / Q000472:pathogenicity*; D013552:Swine