Journal
DEVELOPMENTAL BIOLOGY
Volume 317, Issue 2, Pages 454-466Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ydbio.2008.02.033
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Funding
- NCRR NIH HHS [P20 RR016460, P20 RR020146, RR020146, P2RR-16460] Funding Source: Medline
- NICHD NIH HHS [R01 HD35688, R01 HD035688-08A2, R01 HD035688] Funding Source: Medline
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Cell cycle progression during oocyte maturation requires the strict temporal regulation of matemal mRNA translation. The intrinsic basis of this temporal control has not been fully elucidated but appears to involve distinct mRNA 3' UTR regulatory elements. In this study, we identify a novel translational control sequence (TCS) that exerts repression of target mRNAs in immature oocytes of the frog, Xenopus laevis, and can direct early cytoplasmic polyadenylation and translational activation during oocyte maturation. The TCS is functionally distinct from the previously characterized Musashi/polyadenylation response element (PRE) and the cytoplasmic polyadenylation element (CPE). We report that TCS elements exert translational repression in both the Weel mRNA 3' UTR and the pericentriolar material-1 (Pcm-1) mRNA 3' UTR in immature oocytes. During oocyte maturation, TCS function directs the early translational activation of the Pcm-1 mRNA. By contrast, we demonstrate that CPE sequences flanking the TCS elements in the Weel 3' UTR suppress the ability of the TCS to direct early translational activation. Our results indicate that a functional hierarchy exists between these distinct 3' UTR regulatory elements to control the timing of maternal mRNA translational activation during oocyte maturation. (C) 2008 Published by Elsevier Inc.
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