Maternal mRNA deadenylation and decay by the piRNA pathway in the early Drosophila embryo

Rouget Christel, Papin Catherine, Boureux Anthony, Meunier Anne Cecile, Franco Bénédicte, Robine Nicolas, Lai Eric C., Pelisson Alain, Simonelig Martine. 2010. Maternal mRNA deadenylation and decay by the piRNA pathway in the early Drosophila embryo. Nature, 467:7319 : 1128-1132.

Quartile : Outlier, Sujet : MULTIDISCIPLINARY SCIENCES

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Economie-gestion; Psychologie-éthologie-ergonomie

Résumé : Piwi-associated RNAs (piRNAs), a specific class of 24- to 30-nucleotide-long RNAs produced by the Piwi-type of Argonaute proteins, have a specific germline function in repressing transposable elements. This repression is thought to involve heterochromatin formation and transcriptional and post-transcriptional silencing1,2,3,4,5,6. The piRNA pathway has other essential functions in germline stem cell maintenance7 and in maintaining germline DNA integrity8,9,10. Here we uncover an unexpected function of the piRNA pathway in the decay of maternal messenger RNAs and in translational repression in the early embryo. A subset of maternal mRNAs is degraded in the embryo at the maternal-to-zygotic transition. In Drosophila, maternal mRNA degradation depends on the RNA-binding protein Smaug and the deadenylase CCR411,12,13, as well as the zygotic expression of a microRNA cluster14. Using mRNA encoding the embryonic posterior morphogen Nanos (Nos) as a paradigm to study maternal mRNA decay, we found that CCR4-mediated deadenylation of nos depends on components of the piRNA pathway including piRNAs complementary to a specific region in the nos 3′ untranslated region. Reduced deadenylation when piRNA-induced regulation is impaired correlates with nos mRNA stabilization and translational derepression in the embryo, resulting in head development defects. Aubergine, one of the Argonaute proteins in the piRNA pathway, is present in a complex with Smaug, CCR4, nos mRNA and piRNAs that target the nos 3′ untranslated region, in the bulk of the embryo. We propose that piRNAs and their associated proteins act together with Smaug to recruit the CCR4 deadenylation complex to specific mRNAs, thus promoting their decay. Because the piRNAs involved in this regulation are produced from transposable elements, this identifies a direct developmental function for transposable elements in the regulation of gene expression.

Mots-clés Agrovoc : arn, Drosophila, biologie animale, embryon animal, développement embryonnaire

Mots-clés libres : Developmental biology, Gene regulation, Piwi RNAs

Classification Agris : L50 - Physiologie et biochimie animales
L52 - Physiologie animale - Croissance et développement

Champ stratégique Cirad : Hors axes (2005-2013)

Auteurs et affiliations

• Rouget Christel, CNRS (FRA)
• Papin Catherine, CNRS (FRA)
• Boureux Anthony, Université de Montpellier (FRA)
• Meunier Anne Cecile, CNRS (FRA)
• Franco Bénédicte, CNRS (FRA)
• Robine Nicolas, Sloan-Kettering Institute (USA)
• Lai Eric C., Sloan-Kettering Institute (USA)
• Pelisson Alain, CNRS (FRA)
• Simonelig Martine, Université de Montpellier (FRA) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/595662/)

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