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. 1998 Mar;10(3):475–484. doi: 10.1105/tpc.10.3.475

Light regulation of Fed-1 mRNA requires an element in the 5' untranslated region and correlates with differential polyribosome association.

L F Dickey 1, M E Petracek 1, T T Nguyen 1, E R Hansen 1, W F Thompson 1
PMCID: PMC143995  PMID: 9501119

Abstract

Light regulation of Fed-1 mRNA abundance in the leaves of green plants is primarily a post-transcriptional process. Previously, we have shown that the Fed-1 mRNA light response requires an open reading frame, indicating that the light regulation of the mRNA depends on its concurrent translation. We now show that light-induced increases in Fed-1 mRNA abundance are associated with increases in polyribosome association that require both a functional AUG and a normal Fed-1 translational start context. We also present evidence that light regulation of Fed-1 mRNA levels requires more than efficient translation per se. Substitution of the efficiently translated tobacco mosaic virus Omega 5' untranslated region resulted in a loss of Fed-1 light regulation. In addition, we identified a CAT T repeat element located near the 5' terminus of the Fed-1 5' untranslated region that is essential for light regulation. We introduced two different mutations in the CAT T repeat element, but only one of these substitutions blocked the normal light effect on polyribosome association, whereas both altered dark-induced Fed-1 mRNA disappearance. The element may thus be important for Fed-1 mRNA stability rather than polyribosome loading. We propose a model in which Fed-1 mRNA is relatively stable when it is associated with polyribosomes in illuminated plants but in darkness is not polyribosome associated and is thus rapidly degraded by a process involving the CAT T repeat element.

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Selected References

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