Single Molecule RNA Localization and Translation in the Mammalian Oocyte and Embryo

During oocyte growth the cell accumulates RNAs to contribute to oocyte and embryo development which progresses with ceased transcription. To investigate the subcellular distribution of specific RNAs and their translation we developed a technique revealing several instances of localized translation with distinctive regulatory implications. We analyzed the localization and expression of candidate non-coding and mRNAs in the mouse oocyte and embryo. Furthermore, we established simultaneous visualization of mRNA and in situ translation events validated with polysomal occupancy. We discovered that translationally dormant and abundant mRNAs CyclinB1 and Mos are localized in the cytoplasm of the fully grown GV oocyte forming cloud-like structures with consequent abundant translation at the center of the MII oocyte. Coupling detection of the localization of specific single mRNA molecules with their translation at the subcellular context is a valuable tool to quantitatively study temporal and spatial translation of specific target mRNAs to understand molecular processes in the developing cell. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

This study investigates the subcellular distribution and translation of specific RNAs in oocytes and embryos, revealing instances of localized translation with distinctive regulatory implications. The researchers found that translationally dormant and abundant mRNAs CyclinB1 and Mos are localized in the cytoplasm of fully grown GV oocytes, forming cloud-like structures with abundant translation at the center of MII oocytes. Coupling detection of specific mRNA localization with their translation at the subcellular level is a valuable tool for quantitatively studying temporal and spatial translation of target mRNAs in developing cells.