Hepatitis C virus RNA functionally sequesters miR-122.

Hepatitis C virus RNA functionally sequesters miR-122.
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DOI:
10.1016/j.cell.2015.02.025
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发表时间:
2015-03-12
期刊:
影响因子:
64.5
通讯作者:
Darnell RB
Darnell RB
中科院分区:
生物学1区
文献类型:
--
作者:
Luna JM;Scheel TK;Danino T;Shaw KS;Mele A;Fak JJ;Nishiuchi E;Takacs CN;Catanese MT;de Jong YP;Jacobson IM;Rice CM;Darnell RB

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丙型肝炎病毒独特地需要肝脏特异的microRNA-122进行复制,但在感染过程中对内源性miRNA靶标的全球影响尚不清楚。在这里,高通量测序和高通量交联免疫沉淀(HITS-CLIP)实验显示,在已知和预测的miR-122位点,人类Argavite(AGO)在丙型肝炎病毒感染期间与丙型肝炎病毒5‘非编码区(UTR)有很强的结合。在人类转录组上,我们观察到病毒感染期间miR-122靶标的AGO结合减少和功能mRNA下调。这种miR-122的“海绵”效应被解除,并通过交换病毒的miRNA趋向性而重定向到miR-15靶点。来自含有miR-122位点的记者的单细胞表达数据显示,在丙型肝炎病毒感染期间,根据表达水平和位点数的不同,显著下调。我们描述了一个丙型肝炎病毒诱导miR-122截留的定量数学模型,并认为这种由丙型肝炎病毒RNA抑制miR-122的作用可能导致宿主miR-122靶点的全局下调,为丙型肝炎病毒的长期致癌潜力提供了一个肥沃的环境。
Hepatitis C virus uniquely requires the liver specific microRNA-122 for replication, yet global effects on endogenous miRNA targets during infection are unexplored. Here, high-throughput sequencing and crosslinking immunoprecipitation (HITS-CLIP) experiments of human Argonaute (Ago) during HCV infection showed robust Ago binding on the HCV 5′UTR, at known and predicted miR-122 sites. On the human transcriptome, we observed reduced Ago binding and functional mRNA de-repression of miR-122 targets during virus infection. This miR-122 “sponge” effect was relieved and redirected to miR-15 targets by swapping the miRNA tropism of the virus. Single-cell expression data from reporters containing miR-122 sites showed significant de-repression during HCV infection depending on expression level and site number. We describe a quantitative mathematical model of HCV induced miR-122 sequestration and propose that such miR-122 inhibition by HCV RNA may result in global de-repression of host miR-122 targets, providing an environment fertile for the long-term oncogenic potential of HCV.
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