Down-regulation of a host microRNA by a viral noncoding RNA.

Down-regulation of a host microRNA by a viral noncoding RNA.
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DOI:
10.1101/sqb.2010.75.009
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发表时间:
2010
期刊:
Cold Spring Harbor symposia on quantitative biology
影响因子:
--
通讯作者:
Steitz JA
Steitz JA
中科院分区:
其他
文献类型:
--
作者:
Cazalla D;Steitz JA

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在病毒生命周期的潜伏期或裂解期,灵长类疱疹病毒比任何其他类别的哺乳动物病毒表达更多的非编码 RNA (ncRNA)。被猴疱疹病毒 saimiri (HVS) 转化的 T 细胞表达七种富含 U 的病毒 ncRNA,称为 HSUR。 HSUR1 和 2 中的保守序列与三种宿主细胞 microRNA (miRNA) 表现出互补性。预测的 HSUR1 和 2 与这些 miRNA 的相互作用通过对由缺乏这两种 HSUR 的野生型或突变型 HVS 转化的狨猴 T 细胞提取物进行的共免疫沉淀实验得到了证实。突变分析表明,miR-27 与 HSUR1 的结合以及 miR-16 与 HSUR2 的结合涉及碱基配对。其中一种 miRNA,miR-27,在 HVS 转化细胞中的丰度显着降低,从而影响 miR-27 靶基因的表达。 HSUR1 的瞬时敲低和异位表达表明,成熟 miR-27 的降解以序列特异性和结合依赖性方式发生,但不是通过富含 AU 的元件 (ARE) 介导的衰变发生,后者控制 HSUR1 本身的细胞内水平。这种病毒策略例证了使用 ncRNA 通过 miRNA 途径控制宿主细胞基因表达,并且在实验和治疗方面具有潜在的应用。
Primate herpesviruses express more noncoding RNAs (ncRNAs) than any other class of mammalian viruses during either latency or the lytic phase of the viral life cycle. T cells transformed by the monkey virus Herpesvirus saimiri (HVS) express seven viral U-rich ncRNAs called HSURs. Conserved sequences in HSURs1 and 2 exhibit complementarity to three host-cell microRNAs (miRNAs). The predicted interactions of HSURs1 and 2 with these miRNAs were confirmed by coimmuno-precipitation experiments performed on extracts of marmoset T cells transformed by a wild-type or a mutant HVS lacking these two HSURs. Mutational analyses demonstrated that the binding of miR-27 to HSUR1 and that of miR-16 to HSUR2 involves base pairing. One of these miRNAs, miR-27, is dramatically lowered in abundance in HVS-transformed cells, with consequent effects on the expression of miR-27 target genes. Transient knockdown and ectopic expression of HSUR1 demonstrated that degradation of mature miR-27 occurs in a sequence-specific and binding-dependent manner but does not occur by AU-rich element (ARE)-mediated decay, which controls the intracellular level of HSUR1 itself. This viral strategy exemplifies the use of an ncRNA to control host-cell gene expression via the miRNA pathway and has potential applications both experimentally and therapeutically.
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