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Trends Plant Sci. 2015 Nov;20(11):767-779. doi: 10.1016/j.tplants.2015.08.011. Epub 2015 Oct 3.

Unique Aspects of Plant Nonsense-Mediated mRNA Decay.

Author information

1
The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 5290002, Israel. Electronic address: orsha@mail.biu.ac.il.

Abstract

Nonsense-mediated mRNA Decay (NMD) is a eukaryotic quality-control mechanism that governs the stability of both aberrant and normal transcripts. Although plant and mammalian NMD share great similarity, they differ in certain mechanistic and regulatory aspects. Whereas SMG6 (from Caenorhabditis elegans 'suppressor with morphogenetic effect on genitalia')-catalyzed endonucleolytic cleavage is a prominent step in mammalian NMD, plant NMD targets are degraded by an SMG7-induced exonucleolytic pathway. Both mammalian and plant NMD are downregulated by stress, thereby enhancing the expression of defense response genes. However, the target genes and processes affected differ. Several plant and mammalian NMD factors are regulated by negative feedback-loops. However, while the loop regulating UPF3 (up-frameshift 3) expression in not vital for mammalian NMD, the sensitivity of UPF3 to NMD is crucial for the overall regulation of plant NMD.

KEYWORDS:

NMD regulation; RNA stability; UPF; biotic stress; mammalian NMD; plant NMD

PMID:
26442679
DOI:
10.1016/j.tplants.2015.08.011
[Indexed for MEDLINE]

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