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Chen N, Ye M, Huang Y, Li S, Xiao Y, Li X, Li S, Li X, Yu X, Tian K, Zhu J. Identification of Two Porcine Reproductive and Respiratory Syndrome Virus Variants Sharing High Genomic Homology but with Distinct Virulence. Viruses 2019; 11:v11090875. [PMID: 31540541 PMCID: PMC6783987 DOI: 10.3390/v11090875] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 09/09/2019] [Accepted: 09/17/2019] [Indexed: 11/16/2022] Open
Abstract
Porcine reproductive and respiratory syndrome virus (PRRSV) causes huge economic loss to the global swine industry. Even though several control strategies have been applied, PRRS is still not effectively controlled due to the continuous emergence of new variants and limited cross-protection by current vaccines. During the routine epidemiological investigation in 2017, two PRRSV variants were identified from a severe abortion farm and a clinically healthy farm, respectively. The viruses were isolated and denominated as XJ17-5 and JSTZ1712-12. Genomic sequencing indicated that their genomes are both 14,960 bp in length sharing 99.45% nucleotide identity. Sequence alignments identified a discontinuous 30-amino-acid deletion and a continuous 120-amino-acid deletion in nsp2 of both isolates. Genome-based phylogenetic analysis confirmed that XJ17-5 and JSTZ1712-12 belong to the HP-PRRSV subtype but form a new branch with other isolates containing the same 150-amino-acid deletion in nsp2. Pathogenic analysis showed that XJ17-5 is highly virulent causing 60% mortality, while JSTZ1712-12 is avirulent for piglets. Furthermore, fragment comparisons identified 34-amino-acid differences between XJ17-5 and JSTZ1712-12 that might be associated with the distinct virulence. The identification of highly homologous HP-PRRSV variants with new genetic feature and distinct virulence contributes to further analyze the pathogenesis and evolution of PRRSV in the field.
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Affiliation(s)
- Nanhua Chen
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, China.
| | - Mengxue Ye
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Yucheng Huang
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Shuai Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Yanzhao Xiao
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Xinshuai Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Shubin Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Xiangdong Li
- National Research Center for Veterinary Medicine, High-Tech District, Luoyang, Henan 471003, China
| | - Xiuling Yu
- National Research Center for Veterinary Medicine, High-Tech District, Luoyang, Henan 471003, China
| | - Kegong Tian
- National Research Center for Veterinary Medicine, High-Tech District, Luoyang, Henan 471003, China
| | - Jianzhong Zhu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, China.
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