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Originally published as MBC in Press, 10.1091/mbc.E09-02-0123 on October 7, 2009

Vol. 20, Issue 23, 4951-4961, December 1, 2009

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Dcp1-Bodies in Mouse Oocytes

Adam Swetloff, Beatrice Conne, Joachim Huarte, Jean-Luc Pitetti, Serge Nef, and Jean-Dominique Vassalli

Department of Genetic Medicine and Development, Faculty of Medicine, University of Geneva, 1211 Geneva 4, Switzerland

Submitted February 12, 2009; Revised September 8, 2009; Accepted September 24, 2009
Monitoring Editor: A. Gregory Matera

Processing bodies (P-bodies) are cytoplasmic granules involved in the storage and degradation of mRNAs. In somatic cells, their formation involves miRNA-mediated mRNA silencing. Many P-body protein components are also found in germ cell granules, such as in mammalian spermatocytes. In fully grown mammalian oocytes, where changes in gene expression depend entirely on translational control, RNA granules have not as yet been characterized. Here we show the presence of P-body-like foci in mouse oocytes, as revealed by the presence of Dcp1a and the colocalization of RNA-associated protein 55 (RAP55) and the DEAD box RNA helicase Rck/p54, two proteins associated with P-bodies and translational control. These P-body-like structures have been called Dcp1-bodies and in meiotically arrested primary oocytes, two types can be distinguished based on their size. They also have different protein partners and sensitivities to the depletion of endogenous siRNA/miRNA and translational inhibitors. However, both type progressively disappear during in vitro meiotic maturation and are virtually absent in metaphase II–arrested secondary oocytes. Moreover, this disassembly of hDcp1a-bodies is concomitant with the posttranslational modification of EGFP-hDcp1a.

This was published online ahead of print in MBC in Press (http://www.molbiolcell.org/cgi/doi/10.1091/mbc.E09-02-0123) on October 7, 2009.

Address correspondence to: Jean-Dominique Vassalli (jean-dominique.vassalli{at}unige.ch).






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