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A new strategy was developed to study the relationship between
the translation and degradation of a specific mRNA in the yeast
Saccharomyces cerevisiae. A series of 5`-untranslated regions
(UTR) was combined with the cat gene from the bacterial
transposon Tn9, allowing us to test the influence of upstream
open reading frames (uORFs) on translation and mRNA stability. The
5`-UTR sequences were designed so that the minimum possible sequence
alteration, a single nucleotide substitution, could be used to create a
7-codon ORF upstream of the cat gene. The uORF was translated
efficiently, but at the same time inhibited translation of the cat ORF and destabilized the cat mRNA. Investigations of
various derivatives of the 5`-UTR indicated that cat translation was primarily attributable to leaky scanning of
ribosomes past the uORF rather than to reinitiation. Therefore, these
data directly demonstrate destabilization of a specific mRNA linked to
changes in translational initiation on the same transcript. In contrast
to the previously proposed nonsense-mediated mRNA decay pathway,
destabilization was not triggered by premature translational
termination in the main ORF and was not discernibly dependent upon a
reinitiation-driven mechanism. This suggests the existence of an as yet
not described pathway of translation-linked mRNA degradation.
Volume 270,
Number 15,
Issue of April 14, pp. 8936-8943, 1995
©1995 by The American Society for Biochemistry and Molecular Biology, Inc.
A SHORT UPSTREAM OPEN READING FRAME STRONGLY INHIBITS TRANSLATIONAL
INITIATION AND GREATLY ACCELERATES mRNA DEGRADATION IN THE YEAST
SACCHAROMYCES CEREVISIAE
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