Nonsense-Mediated Decay of Mutant waxy mRNA in Rice

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Nonsense-mediated decay of mutant waxy mRNA in rice.

Two rice (Oryza sativa) waxy mutations of the Japonica background were shown to contain approximately 20% of the fully spliced mRNA relative to the wild type. Sequencing analysis of the entire waxy genes of the two mutants revealed the presence of premature translation termination codons in exon 2 and exon 7. These results indicated that the lower accumulation of fully spliced RNA in the mutant...

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Nonsense-mediated mRNA decay.

Translation and mRNA decay are coupled processes; the link is most obvious in the case of NMD (nonsense-mediated mRNA decay). NMD is a mechanism that drastically reduces the level of mRNA harbouring PTCs (premature translation termination codons). The defining event in NMD is premature translation termination and the key question is: what distinguishes premature from normal translation terminat...

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Nonsense-mediated mRNA decay

Is it important? Absolutely! NMD probably evolved to eliminate abnormal transcripts due to routine errors in gene expression. For example, inefficient or inaccurate pre-mRNA splicing can generate an intron-derived in frame nonsense codon, or a shift in the reading frame and an exon-derived nonsense codon downstream of the shift. There are also natural substrates for NMD such as alternatively sp...

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ژورنال

عنوان ژورنال: Plant Physiology

سال: 2001

ISSN: 1532-2548,0032-0889

DOI: 10.1104/pp.125.3.1388