Characterization of a pathogenic full-length cDNA clone of a virulent porcine epidemic diarrhea virus strain AH2012/12 in China.

Characterization of a pathogenic full-length cDNA clone of a virulent porcine epidemic diarrhea virus strain AH2012/12 in China.
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中国猪流行性腹泻强毒株AH2012/12致病性全长cDNA克隆的鉴定

DOI:
10.1016/j.virol.2016.10.011
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发表时间:
2017-01
期刊:
影响因子:
3.7
通讯作者:
Li B
Li B
中科院分区:
医学3区
文献类型:
--
作者:
Fan B;Yu Z;Pang F;Xu X;Zhang B;Guo R;He K;Li B

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自2010年以来,变异型猪流行性腹泻病毒(PEDV)疫情席卷全球,造成了巨大的经济损失。由于分离毒株和病毒基因组操作方面的困难,新的、更有效的疫苗的开发受到了阻碍。在本研究中,我们成功地从中国一个报告严重腹泻的猪场分离出一株高致病性野外菌株AH2012/12。系统发育分析表明,新分离株属于G2群,代表流行株和大流行株。此外,我们构建了新分离株rAH2012/12的感染性cDNA克隆,并在体外显示出与亲本病毒相同的表型特性。体内实验表明,获救的病毒表现出与亲本分离病毒相似的致病性,在乳猪中造成高死亡率。该研究为研制减毒活疫苗和研究该病毒的致病机制提供了坚实的基础。在新生猪中成功分离出1株高毒力PEDV流行株AH2012/12。我们在国内首次获得了PEDV毒株AH2012/12的感染性cDNA克隆。在体外和体内,救出的病毒与亲本病毒具有相似的生物学特性。
Since 2010, outbreaks of variant porcine epidemic diarrhea virus (PEDV) have swept across the world causing substantial economic losses. The development of new, more effective vaccines has been hampered by difficulties in isolating strains and viral genome manipulation. In the present study, we successfully isolated a highly pathogenic field strain AH2012/12, from a pig farm reporting severe diarrhea in China. Phylogenetic analysis revealed that the new isolate belongs to group G2, which represents epidemic and pandemic field strains. Furthermore, we constructed an infectious cDNA clone of the newly isolated strain, rAH2012/12, and the rescued virus displayed phenotypic properties identical to the parental virus in vitro. In vivo experiments demonstrated that the rescued virus displayed similar pathogenicity to the parental isolate, causing high mortality rates in suckling pigs. This study provided a strong basis for the development of live attenuated vaccines and for research into the pathogenic mechanisms of this virus. We successfully isolated one epidemic PEDV strain AH2012/12 with high virulent in newborn pigs. We firstly generated the infectious cDNA clone of the virulent PEDV strain AH2012/12 in China. The rescued virus has similar biological characteristics with the parent virus in vitro and vivo.
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