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Updated: May 24, 2026

Application of RNAi and Heat-shock-induced Transcription Factor Expression to Reprogram Germ Cells to Neurons in C. elegans
Published on: January 1, 2018
Translational control of the embryonic cell cycle
Irina Groisman1, Mi-Young Jung, Madathia Sarkissian
1Program in Molecular Medicine, University of Massachusetts Medical School, Worcester 01605, USA.
Regulated translation of cyclin B1 mRNA, controlled by polyadenylation, is essential for the embryonic cell cycle. This mechanism, involving CPEB and Maskin, may be a general feature of mitosis in animal cells.
Area of Science:
- Cell Biology
- Molecular Biology
- Developmental Biology
Background:
- Mitosis in eukaryotic cells is driven by cyclin B synthesis and degradation.
- Cell cycle progression is also influenced by cyclin B translation.
- Cyclin B1 mRNA translation is regulated during the cell cycle.
Purpose of the Study:
- To investigate the role of cyclin B1 mRNA translation in the embryonic cell cycle.
- To elucidate the mechanisms regulating cyclin B1 mRNA translation.
- To determine if translational control by polyadenylation is a general feature of mitosis.
Main Methods:
- Studied cycling extracts from Xenopus embryos.
- Investigated the role of polyadenylation and deadenylation in cyclin B1 mRNA regulation.
- Examined the involvement of CPEB, Aurora kinase, and Maskin in translational control.
Main Results:
- Progression into M phase requires polyadenylation-induced translation of cyclin B1 mRNA.
- Phosphorylation of CPEB by Aurora kinase mediates polyadenylation.
- Exit from M phase involves deadenylation and translational silencing of cyclin B1 mRNA by Maskin.
- Maskin's expression is cell cycle regulated.
Conclusions:
- Regulated cyclin B1 mRNA translation is essential for the embryonic cell cycle.
- Cyclin B1 mRNA translation is controlled by polyadenylation and deadenylation.
- Cell cycle-dependent cytoplasmic polyadenylation in mammalian cells suggests this is a general mitotic feature in animal cells.
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