Dicer-2 promotes mRNA activation through cytoplasmic polyadenylation

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Coll, Olga | Guitart, Tanit | Villalba, Ana | Papin, Catherine | Simonelig, Martine | Gebauer, Fátima

Edité par CCSD ; Cold Spring Harbor Laboratory Press -

International audience. Cytoplasmic polyadenylation is a widespread mechanism to regulate mRNA translation. In vertebrates, this process requires two sequence elements in target 3' UTRs: the U-rich cytoplasmic polyadenylation element and the AAUAAA hexanucleotide. InDrosophila melanogaster, cytoplasmic polyadenylation ofTollmRNA occurs independently of these canonical elements and requires a machinery that remains to be characterized. Here we identify Dicer-2 as a component of this machinery. Dicer-2, a factor previously involved in RNA interference (RNAi), interacts with the cytoplasmic poly(A) polymerase Wispy. Depletion of Dicer-2 from polyadenylation-competent embryo extracts and analysis ofwispymutants indicate that both factors are necessary for polyadenylation and translation ofTollmRNA. We further identifyr2d2mRNA, encoding a Dicer-2 partner in RNAi, as a Dicer-2 polyadenylation target. Our results uncover a novel function of Dicer-2 in activation of mRNA translation through cytoplasmic polyadenylation.

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