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Updated: Feb 25, 2026
Defining the Program of Maternal mRNA Translation during In vitro Maturation using a Single Oocyte Reporter Assay
Published on: June 16, 2021
Regulation of Translationally Repressed mRNAs in Zebrafish and Mouse Oocytes
Tomoya Kotani1, Kaori Maehata2, Natsumi Takei2
1Department of Biological Sciences, Faculty of Science, Hokkaido University, North 10 West 8, Sapporo, Hokkaido, 060-0810, Japan. tkotani@sci.hokudai.ac.jp.
Abstract:
From the beginning of oogenesis, oocytes accumulate tens of thousands of mRNAs for promoting oocyte growth and development. A large number of these mRNAs are translationally repressed and localized within the oocyte cytoplasm. Translational activation of these dormant mRNAs at specific sites and timings plays central roles in driving progression of the meiotic cell cycle, axis formation, mitotic cleavages, transcriptional initiation, and morphogenesis. Regulation of the localization and temporal translation of these mRNAs has been shown to rely on cis-acting elements in the mRNAs and trans-acting factors recognizing and binding to the elements. Recently, using model vertebrate zebrafish, localization itself and formation of physiological structures such as RNA granules have been shown to coordinate the accurate timings of translational activation of dormant mRNAs. This subcellular regulation of mRNAs is also utilized in other animals including mouse. In this chapter, we review fundamental roles of temporal regulation of mRNA translation in oogenesis and early development and then focus on the mechanisms of mRNA regulation in the oocyte cytoplasm by which the activation of dormant mRNAs at specific timings is achieved.
Insights
Oocytes store thousands of dormant mRNAs crucial for development. Their precise temporal translation, regulated by localization and RNA granules, drives key early life events.
Area of Science:
- Developmental Biology
- Molecular Biology
- Cell Biology
Background:
- Oocytes accumulate numerous mRNAs for growth and development.
- Many oocyte mRNAs are translationally repressed and localized in the cytoplasm.
- Temporal translation of these mRNAs is vital for cell cycle, axis formation, and morphogenesis.
Purpose of the Study:
- To review the roles of temporal mRNA translation regulation in oogenesis and early development.
- To focus on the mechanisms of mRNA regulation within the oocyte cytoplasm.
- To explain how dormant mRNAs are activated at specific times.
Main Methods:
- Review of existing literature on mRNA regulation in oocytes.
- Focus on cis-acting elements and trans-acting factors.
- Examination of RNA granule formation and mRNA localization.
Main Results:
- mRNA localization and RNA granules coordinate the timing of translational activation.
- Subcellular regulation of mRNA translation is conserved across species (e.g., zebrafish, mouse).
- Temporal control of mRNA translation is fundamental to oogenesis and early development.
Conclusions:
- Precise temporal translation of dormant mRNAs is essential for oocyte development and early embryogenesis.
- Mechanisms involving mRNA localization and RNA granules ensure accurate translational timing.
- Understanding these cytoplasmic regulatory mechanisms is key to deciphering developmental processes.
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