A Novel Motif in the 3 '-UTR of PRRSV-2 Is Critical for Viral Multiplication and Contributes to Enhanced Replication Ability of Highly Pathogenic or L1 PRRSV

文献类型： 外文期刊

第一作者： Xiong, Junyao

作者： Xiong, Junyao;Cui, Xingyang;Zhao, Kuan;Wang, Qian;Huang, Xinyi;Li, Dongyan;Yu, Fang;Yang, Yongbo;Tian, Zhijun;Cai, Xuehui;An, Tongqing;Liu, Di

作者机构：

关键词： HP-PRRSV; 3 '-UTR; secondary structure; motif; replication; epidemic

期刊名称：VIRUSES-BASEL （ 影响因子：5.818； 五年影响因子：5.811 ）

ISSN：

年卷期： 2022 年 14 卷 2 期

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收录情况： SCI

摘要： Highly pathogenic porcine reproductive and respiratory syndrome virus (HP-PRRSV) with enhanced replication capability emerged in China and has become dominant epidemic strain since 2006. Up to now, the replication-regulated genes of PRRSV have not been fully clarified. Here, by swapping the genes or elements between HP-PRRSV and classical PRRSV based on infectious clones, NSP1, NSP2, NSP7, NSP9 and 3 & PRIME;-UTR are found to contribute to the high replication efficiency of HP-PRRSV. Further study revealed that mutations at positions 117th or 119th in the 3 & PRIME;-UTR are significantly related to replication efficiency, and the nucleotide at position 120th is critical for viral rescue. The motif composed by 117-120th nucleotides was quite conservative within each lineage of PRRSV; mutations in the motif of HP-PRRSV and currently epidemic lineage 1 (L1) PRRSV showed higher synthesis ability of viral negative genomic RNA, suggesting that those mutations were beneficial for viral replication. RNA structure analysis revealed that this motif maybe involved into a pseudoknot in the 3 & PRIME;-UTR. The results discovered a novel motif, 117-120th nucleotide in the 3 & PRIME;-UTR, that is critical for replication of PRRSV-2, and mutations in the motif contribute to the enhanced replicative ability of HP-PRRSV or L1 PRRSV. Our findings will help to understand the molecular basis of PRRSV replication and find the potential factors resulting in an epidemic strain of PRRSV.

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