RNA Quality Control as a Key to Suppressing RNA Silencing of Endogenous Genes in Plants.

RNA Quality Control as a Key to Suppressing RNA Silencing of Endogenous Genes in Plants.
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RNA 质量控制是抑制植物内源基因 RNA 沉默的关键。

DOI:
10.1016/j.molp.2016.03.011
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发表时间:
2016-06-06
期刊:
影响因子:
27.5
通讯作者:
Chen X
Chen X
中科院分区:
生物学1区
文献类型:
--
作者:
Liu L;Chen X

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内源RNA的RNA质量控制是真核基因表达的一个组成部分,通常依赖于核外降解来消除功能障碍的转录本。同时,外源和选择的内源RNA通过RNA沉默降解,这是许多真核生物使用的一种基因组防御机制。在植物中,RNA沉默是由依赖于RNA的RNA聚合酶(RDR)产生双链RNA(DsRNAs)触发的,并通过小干扰(Si)RNA指导、ArgAerte(Ago)介导的同源转录本的切割来进行。许多研究表明,植物通过利用RNA监视机制来保护其转录组,从而避免内源编码基因的不适当PTGS。RNA监视和RNA沉默之间的拉锯战确保了内源RNA底物在这些降解途径中的适当分配。在这里,我们综述了RNA质量控制的最新进展及其在抑制内源基因RNA沉默中的作用,并讨论了这些途径之间的串扰机制。
RNA quality control of endogenous RNAs is an integral part of eukaryotic gene expression and often relies on exonucleolytic degradation to eliminate dysfunctional transcripts. In parallel, exogenous and selected endogenous RNAs are degraded through RNA silencing, which is a genome defense mechanism used by many eukaryotes. In plants, RNA silencing is triggered by the production of double-stranded RNAs (dsRNAs) by RNA-DEPENDENT RNA POLYMERASEs (RDRs) and proceeds through small interfering (si) RNA-directed, ARGONAUTE (AGO)-mediated cleavage of homologous transcripts. Many studies revealed that plants avert inappropriate PTGS of endogenous coding genes by using RNA surveillance mechanisms as a safeguard to protect their transcriptome. The tug-of-war between RNA surveillance and RNA silencing ensures the appropriate partitioning of endogenous RNA substrates among these degradation pathways. Here we review recent advances on RNA quality control and its role in the suppression of RNA silencing at endogenous genes and discuss the mechanisms underlying the crosstalk among these pathways.
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