Mycoreovirus genome rearrangements associated with RNA silencing deficiency.

Mycoreovirus genome rearrangements associated with RNA silencing deficiency.
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DOI:
10.1093/nar/gkv239
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发表时间:
2015-04-20
影响因子:
14.9
通讯作者:
Suzuki N
Suzuki N
中科院分区:
生物学2区
文献类型:
--
作者:
Eusebio-Cope A;Suzuki N

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MyRV 1(Myreovirus 1)具有11个双链RNA基因组片段(S1至S11),并赋予栗疫病菌(Cryphonectria parasitica)弱毒力。MyRV 1基因组重排通常由多功能蛋白p29产生,p29由正链RNA病毒Cryphonectria hypovirus 1编码。其功能作用之一是RNA沉默抑制。在这里,我们探讨了MyRV 1基因组重排和宿主RNA沉默途径之间的可能联系,使用野生型(WT)和突变株MyRV 1和宿主真菌。宿主株包括RNA沉默组分如dicer样(dcl)和argonaute样(agl)基因的缺失突变体,而病毒株包括S4内部缺失突变体MyRV 1/S4 ss。因此,在感染MyRV 1/S4 ss的RNA沉默缺陷型毒株Δ dcl 2和Δ agl 2中观察到了几乎完全重复的三个最大片段(即S1、S2和S3)的基因内重排,但在感染任何其他病毒/宿主毒株组合的情况下则没有观察到。在两种宿主菌株中的基因组重排事件之间注意到一个有趣的差异,即与Δ dcl 2相比,Δ agl 2的重排的产生需要延长的培养。这些结果表明RNA沉默抑制dsRNA病毒的基因组重排的作用。
Mycoreovirus 1 (MyRV1) has 11 double-stranded RNA genome segments (S1 to S11) and confers hypovirulence to the chestnut blight fungus, Cryphonectria parasitica. MyRV1 genome rearrangements are frequently generated by a multifunctional protein, p29, encoded by a positive-strand RNA virus, Cryphonectria hypovirus 1. One of its functional roles is RNA silencing suppression. Here, we explored a possible link between MyRV1 genome rearrangements and the host RNA silencing pathway using wild-type (WT) and mutant strains of both MyRV1 and the host fungus. Host strains included deletion mutants of RNA silencing components such as dicer-like (dcl) and argonaute-like (agl) genes, while virus strains included an S4 internal deletion mutant MyRV1/S4ss. Consequently, intragenic rearrangements with nearly complete duplication of the three largest segments, i.e. S1, S2 and S3, were observed even more frequently in the RNA silencing-deficient strains Δdcl2 and Δagl2 infected with MyRV1/S4ss, but not with any other viral/host strain combinations. An interesting difference was noted between genome rearrangement events in the two host strains, i.e. generation of the rearrangement required prolonged culture for Δagl2 in comparison with Δdcl2. These results suggest a role for RNA silencing that suppresses genome rearrangements of a dsRNA virus.
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发表时间: 2013-05-14
影响因子: 11.1
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