The equine herpesvirus-1 (EHV-1) IR3 transcript downregulates expression of the IE gene and the absence of IR3 gene expression alters EHV-1 biological properties and virulence.

The equine herpesvirus-1 (EHV-1) IR3 transcript downregulates expression of the IE gene and the absence of IR3 gene expression alters EHV-1 biological properties and virulence.
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DOI:
10.1016/j.virol.2010.03.051
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发表时间:
2010-07-05
期刊:
影响因子:
3.7
通讯作者:
O'Callaghan DJ
O'Callaghan DJ
中科院分区:
医学3区
文献类型:
--
作者:
Ahn BC;Zhang Y;O'Callaghan DJ

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马疱疹病毒1型(EHV-1)的IR 3转录本含有117个核苷酸的立即早期(IE)mRNA的反义核酸,表明它起着调节作用。在这里,我们表明,IR 3转录下调IE基因的表达和IR 3表达的缺乏改变EHV-1的生物学特性和毒力在小鼠中。报告基因分析表明,IR 3/IE重叠序列[IR 3(+226/+342)]和额外的IR 3(+343/+433)区域是IR 3 RNA下调IE表达所必需的。用Δ IR 3 EHV-1进行的实验表明,IR 3基因对于EHV-1复制是不稳定的。与感染wt EHV-1的细胞相比,感染Δ IR 3 EHV-1的细胞中IE和代表性EHV-1基因的蛋白表达增加。与亲本病毒相比,Δ IR 3 EHV-1在小鼠中表现出增强的毒力。IR 3转录影响IE基因表达的发现扩展了RNA作为α疱疹病毒感染中的调节分子的作用。
The IR3 transcript of equine herpesvirus-1 (EHV-1) harbors 117 nts antisense to the immediate-early (IE) mRNA, suggesting it plays a regulatory role. Here, we show that the IR3 transcript downregulates IE gene expression and that the absence of IR3 expression altered EHV-1 biological properties and virulence in mice. Reporter assays revealed that the IR3/IE overlapping sequences [IR3(+226/+342)] and an additional IR3(+343/+433) region are necessary for the IR3 RNA to downregulate IE expression. Experiments with the ΔIR3 EHV-1 showed that the IR3 gene is dispensable for EHV-1 replication. Protein expression of the IE and representative EHV-1 genes was increased in cells infected with ΔIR3 EHV-1 as compared to that of cells infected with wt EHV-1. The ΔIR3 EHV-1 exhibited increased virulence in mice as compared to the parent virus. The finding that the IR3 transcript affects IE gene expression extends the role of RNA as a regulatory molecule in alphaherpesvirus infection.
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发表时间: 1987-05-01
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