Cross-species comparative analysis of Dicer proteins during Sindbis virus infection.

Cross-species comparative analysis of Dicer proteins during Sindbis virus infection.
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DOI:
10.1038/srep10693
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发表时间:
2015-05-29
期刊:
影响因子:
4.6
通讯作者:
Pfeffer S
Pfeffer S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Girardi E;Lefèvre M;Chane-Woon-Ming B;Paro S;Claydon B;Imler JL;Meignin C;Pfeffer S

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在植物和无脊椎动物中,RNA 沉默是抵抗病毒感染的主要防御机制。 RNA 沉默的第一个事件是将长双链 RNA 切割成小干扰 RNA (siRNA)。参与该过程的 Dicer 蛋白在系统发育上是保守的,并且具有相同的结构域组织。因此,在小鼠中也观察到了病毒衍生的 siRNA 的产生,但仅限于有限的细胞类型。为了深入了解这一限制,我们比较了辛德比斯病毒 (SINV) 感染情况下人 Dicer 和果蝇 Dicer-2 的切块活性。人类 Dicer 在果蝇中的表达不能有效地挽救病毒 siRNA 的产生,但提供了一些针对 SINV 的保护作用。相反,人类细胞中 Dicer-2 的表达可以产生病毒 21 nt 小 RNA。然而,这并没有赋予对病毒感染的抵抗力,反而导致病毒RNA的积累更强。我们进一步表明,人类细胞中 Dicer-2 的表达会扰乱干扰素 (IFN) 信号通路并拮抗蛋白激酶 R (PKR) 介导的抗病毒免疫。总的来说,我们的数据表明 Dicer 和 IFN 途径之间的功能不相容解释了哺乳动物体细胞中 IFN 反应的主导地位。
In plants and invertebrates RNA silencing is a major defense mechanism against virus infections. The first event in RNA silencing is dicing of long double stranded RNAs into small interfering RNAs (siRNAs). The Dicer proteins involved in this process are phylogenetically conserved and have the same domain organization. Accordingly, the production of viral derived siRNAs has also been observed in the mouse, but only in restricted cell types. To gain insight on this restriction, we compare the dicing activity of human Dicer and fly Dicer-2 in the context of Sindbis virus (SINV) infection. Expression of human Dicer in flies inefficiently rescues the production of viral siRNAs but confers some protection against SINV. Conversely, expression of Dicer-2 in human cells allows the production of viral 21 nt small RNAs. However, this does not confer resistance to viral infection, but on the contrary results in stronger accumulation of viral RNA. We further show that Dicer-2 expression in human cells perturbs interferon (IFN) signaling pathways and antagonizes protein kinase R (PKR)-mediated antiviral immunity. Overall, our data suggest that a functional incompatibility between the Dicer and IFN pathways explains the predominance of the IFN response in mammalian somatic cells.
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