Accelerated evolution of PRRSV during recent outbreaks in China.

Virus Genes
Jie SongBaohua Zhao

Abstract

Porcine reproductive and respiratory syndrome virus (PRRSV) is reported to have evolved at a higher evolutionary rate than other RNA viruses. However, whether this virus is capable of evolutionary acceleration during outbreaks remains unknown. In this study, we analyze the data based on ORFs of eight newly obtained epidemic PRRSVs from Hebei province with other viral genomes from GenBank. Phylogenetic analysis suggested that all isolates during recent outbreaks (2006-2008) are grouped together. We also find that ORF5 genes of this viral group are positively selected, suggesting their higher evolutionary rates and coinciding with that period of large-scale outbreaks in China. The evolutionary rate of 3.29 x 10(-3) substitutions per nucleotide site per year also suggests the higher evolutionary rate of these viruses. We concluded that PRRSVs isolated during 2006-2008 in China underwent accelerated evolution, and predicted that this accelerated evolution equip these viruses more adapted to their primary hosts.

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Citations

May 12, 2012·Journal of Virological Methods·Xin-Gang XuHung-Jen Liu
Mar 13, 2014·Infection, Genetics and Evolution : Journal of Molecular Epidemiology and Evolutionary Genetics in Infectious Diseases·Xiaomin WangZhengyu Yu
Mar 10, 2018·Transboundary and Emerging Diseases·L WenK He
Oct 29, 2021·Brazilian Journal of Microbiology : [publication of the Brazilian Society for Microbiology]·Qi ZhangXingang Xu

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