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Updated: Jun 19, 2026
Mouse Oocyte Microinjection, Maturation and Ploidy Assessment
Published on: July 23, 2011
Dcp1-bodies in mouse oocytes
Adam Swetloff1, Beatrice Conne, Joachim Huarte
1Department of Genetic Medicine and Development, Faculty of Medicine, University of Geneva, 1211 Geneva 4, Switzerland.
Abstract:
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.
Insights
Processing bodies (P-bodies) are key for mRNA regulation. In mouse oocytes, novel P-body-like structures called Dcp1-bodies form and disappear during maturation, indicating a role in oocyte gene expression control.
Area of Science:
- Cell Biology
- Molecular Biology
- Developmental Biology
Background:
- Processing bodies (P-bodies) are cytoplasmic granules regulating mRNA fate.
- P-body components are found in germ cell granules, but their role in oocytes is unknown.
- Oocytes rely on translational control for gene expression changes.
Purpose of the Study:
- To characterize RNA granules in mouse oocytes.
- To investigate the presence and nature of P-body-like structures in oocytes.
- To understand the dynamic changes of these structures during oocyte maturation.
Main Methods:
- Immunofluorescence microscopy to detect P-body markers (Dcp1a, RAP55, Rck/p54).
- Observation of Dcp1-bodies in arrested primary oocytes and during in vitro maturation.
- Analysis of protein partners and sensitivity to siRNA/miRNA depletion and translational inhibitors.
- Monitoring of EGFP-hDcp1a posttranslational modification during disassembly.
Main Results:
- P-body-like foci, termed Dcp1-bodies, were identified in mouse oocytes.
- Two distinct types of Dcp1-bodies were observed in primary oocytes, differing in size, protein partners, and inhibitor sensitivity.
- Dcp1-bodies disassembled during in vitro meiotic maturation, with disappearance by the metaphase II stage.
- Disassembly correlated with posttranslational modification of EGFP-hDcp1a.
Conclusions:
- Mouse oocytes contain distinct P-body-like structures (Dcp1-bodies) involved in translational control.
- These Dcp1-bodies undergo dynamic changes and disassembly during meiotic maturation.
- The findings shed light on RNA granule function and regulation in mammalian oocytes.
