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Author Spotlight: An Integrated Workflow to Study the Promoter-Centric Spatio-Temporal Genome Architecture in Scarce Cell Populations
Published on: April 21, 2023
Spatio-temporal expression of ANK2 promotes cytokinesis in oocytes
Anna Tetkova1,2, Denisa Jansova1, Andrej Susor3
1Laboratory of Biochemistry and Molecular Biology of Germ Cells, IAPG CAS, Libechov, Czech Republic.
Abstract:
In the absence of transcription, the regulation of gene expression in oocytes is controlled almost exclusively at the level of transcriptome and proteome stabilization, and translation. A subset of maternal transcripts is stored in a translationally dormant state in the oocyte, and temporally driven translation of specific mRNAs propel meiotic progression, oocyte-to-embryo transition and early embryo development. We identified Ank2.3 as the only transcript variant present in the mouse oocyte and discovered that it is translated after nuclear envelope breakdown. Here we show that Ank2.3 mRNA is localized in higher concentration in the oocyte nucleoplasm and, after nuclear envelope breakdown, in the newly forming spindle where its translation occurs. Furthermore, we reveal that Ank2.3 mRNA contains an oligo-pyrimidine motif at 5'UTR that predetermines its translation through a cap-dependent pathway. Lastly, we show that prevention of ANK2 translation leads to abnormalities in oocyte cytokinesis.
Insights
Mouse oocytes store Ank2.3 mRNA, which is translated after nuclear envelope breakdown to regulate cell division. This process is crucial for oocyte-to-embryo transition and early development.
Area of Science:
- Developmental Biology
- Cell Biology
- Molecular Biology
Background:
- Gene expression in oocytes relies on post-transcriptional regulation, including mRNA translation.
- Maternal transcripts are stored and translated to drive key developmental events like meiosis and the oocyte-to-embryo transition.
Purpose of the Study:
- To investigate the role and regulation of Ank2.3 mRNA translation in mouse oocytes.
- To identify the mechanisms controlling Ank2.3 mRNA translation and its impact on oocyte function.
Main Methods:
- Identification and localization analysis of Ank2.3 mRNA in mouse oocytes.
- Investigation of the 5'UTR sequence and its role in translation initiation.
- Functional studies involving the inhibition of ANK2 protein synthesis.
Main Results:
- Ank2.3 is the sole transcript variant in mouse oocytes and is translated post-nuclear envelope breakdown.
- Ank2.3 mRNA localizes to the nucleoplasm and then the spindle, where translation occurs.
- A 5'UTR oligo-pyrimidine motif dictates cap-dependent translation of Ank2.3 mRNA.
- Inhibition of ANK2 translation disrupts oocyte cytokinesis.
Conclusions:
- Ank2.3 mRNA translation is a critical, spatially regulated event in mouse oocytes.
- The 5'UTR motif ensures timely and localized protein production for meiotic progression.
- Dysregulation of ANK2 translation impairs essential oocyte cytokinesis, highlighting its developmental importance.
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