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

• Published in: Molecular plant 2016-06, Vol.9 (6), p.826-836
• Main Authors: Liu, Lin, Chen, Xuemei
• Format: Article
• Language: English
• Subjects: aberrant RNA; Arabidopsis - genetics; Arabidopsis Proteins - genetics; gene silencing; Gene Silencing - physiology; Quality Control; RNA Interference; RNA quality control; RNA, Plant - genetics; RNA, Small Interfering - genetics; siRNA; Transcriptome
• ISSN: 1674-2052; 1752-9867
• DOI: 10.1016/j.molp.2016.03.011

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 posttranscriptional gene silencing of endogenous coding genes by using RNA surveillance mechanisms as a safeguard to protect their transcriptome profiles. 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. Recent advances on RNA quality control and its role in the suppression of RNA silencing at endogenous genes are summarized and the mechanisms underlying the crosstalk among these pathways are discussed.