A dependent pathway of cytoplasmic polyadenylation reactions linked to cell cycle control by c-mos and CDK1 activation

S Ballantyne, DL Daniel and M Wickens

Department of Biochemistry, University of Wisconsin, Madison 53706, USA.

During oocyte maturation and early development, mRNAs receive poly(A) in the cytoplasm at distinct times relative to one another and to the cell cycle. These cytoplasmic polyadenylation reactions do not occur during oogenesis, but begin during oocyte maturation and continue throughout early development. In this report, we focus on the link between cytoplasmic polyadenylation and control of the cell cycle during meiotic maturation. Activation of maturation promoting factor, a complex of CDK1 and cyclin, is required for maturation and dependent on c-mos protein kinase. We demonstrate here that two classes of polyadenylation exist during oocyte maturation, defined by their dependence of c-mos and CDK1 protein kinases. Polyadenylation of the first class of mRNAs (class I) is independent of c-mos and CDK1 kinase activities, whereas polyadenylation of the second class (class II) requires both of these activities. Class I polyadenylation, through its effects on c-mos mRNA, is required for class II polyadenylation. cis- acting elements responsible for this distinction reside in the 3'- untranslated region, upstream of the polyadenylation signal AAUAAA. Cytoplasmic polyadenylation elements (CPEs) are sufficient to specify class I polyadenylation, and subtle changes in the CPE can substantially, though not entirely, shift an RNA from class I to class II. Activation of class I polyadenylation events is independent of hyperphosphorylation of CPE-binding protein or poly(A) polymerase, and requires cellular protein synthesis. The two classes of polyadenylation and of mRNA define a dependent pathway, in which polyadenylation of certain mRNAs requires the prior polyadenylation of another. We propose that this provides one method of regulating the temporal order of polyadenylation events, and links polyadenylation to the control of the meiotic cell cycle.

Volume 8, Issue 8, pp. 1633-1648, 08/01/1997
Copyright © 1997 by The American Society for Cell Biology

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