数字农科院2.0

Genetic Diversity Of Porcine Reproductive And Respiratory Syndrome Virus 1 In The United States Of America From 2010 To 2018

文献类型： 外文期刊

作者： Wang, AP; Zhang, JQ; Shen, HG; Zheng, Y; Feng, Q; Yim-Im, W; Gauger, PC; Harmon, K; Zhu, SY; An, TQ; Li, GW

作者机构：

关键词： Porcine Reproductive And Respiratory Syndrome Virus; Betaarterivirus Suid 1; Prrsv-1; Next-Generation Sequencing; Genetic Characteristic Diversity

期刊名称： VETERINARY MICROBIOLOGY

ISSN： 0378-1135

年卷期： 2019 年 239 卷

页码：

收录情况： JCR（2021版）

摘要： Porcine reproductive and respiratory syndrome virus 1 (PRRSV-1) was first detected in the United States of America (USA) in 1999, several strains were also recognized soon later, and these isolates are typically called North American (NA) PRRSV-1. However, few reports have characterized PRRSV-1 viruses in the USA. We explored the genetic characteristics and diversity of PRRSV-1 viruses circulating in the USA. PRRSV-1 PCR-positive samples collected from seven states in 2010-2018 (n = 27) were subjected to next-generation sequencing. The 27 PRRSV-1 viruses had 88.4-91.3% nucleotide identity to the PRRSV-1 Lelystad-virus strain (the type 1 prototype strain) and 87.4-89.8% to the previously reported NA PRRSV-1 viruses. Individual proteins had several unique genetic characteristics and only one of the 27 tested samples had the characteristic 17-amino acid (aa) deletion in Nsp2, a genetic marker of NA PRRSV-1 viruses described previously. Fourteen isolates displayed a 3-aa C-terminal truncation in the highly conserved Nsp12 gene; 16 samples had a 21- or 18-aa C-terminal truncation in GP3 gene; and one was observed with a 1-aa deletion at the overlapping region of GP3 and GP4. In addition, the GP5 protein in most isolates, excluding one exception, demonstrated similar genetic variation as other reported NA PRRSV-1 isolates. All tested isolates clustered within subtype 1 together with other available NA PRRSV-1 viruses. Collectively, our results provide up-to-date information on PRRSV-1 viruses circulating in the USA in the past 9 years although the number of PRRSV-1 isolates included in this study is limited. These PRRSV-1 viruses have undergone gradual genetic variation and exhibited some previously undescribed genetic characteristics and diversity, which complicates the diagnosis and control of NA PRRSV-1.

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