Abstract
In Xenopus development, the expression of several maternal mRNAs is regulated by cytoplasmic polyadenylation. CPEB and maskin, two factors that control polyadenylation-induced translation are present on the mitotic apparatus of animal pole blastomeres in embryos. Cyclin B1 protein and mRNA, whose translation is regulated by polyadenylation, are colocalized with CPEB and maskin. CPEB interacts with microtubules and is involved in the localization of cyclin B1 mRNA to the mitotic apparatus. Agents that disrupt polyadenylation-induced translation inhibit cell division and promote spindle and centrosome defects in injected embryos. Two of these agents inhibit the synthesis of cyclin B1 protein and one, which has little effect on this process, disrupts the localization of cyclin B1 mRNA and protein. These data suggest that CPEB-regulated mRNA translation is important for the integrity of the mitotic apparatus and for cell division.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Animals
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Base Sequence
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Cell Cycle Proteins*
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Cell Division
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Cell Line
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Centrosome / chemistry
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Centrosome / metabolism
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Cyclin B / biosynthesis
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Cyclin B / genetics*
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Cyclin B / metabolism
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Cyclin B1
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Embryo, Nonmammalian / metabolism
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Gene Expression Regulation, Developmental
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Immunohistochemistry
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In Situ Hybridization
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Microtubule-Associated Proteins / genetics*
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Microtubule-Associated Proteins / metabolism
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Microtubules / metabolism
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Mutation / genetics
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Oocytes / metabolism
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Oogenesis / genetics
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Poly A / genetics
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Poly A / metabolism
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Protein Binding
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Protein Biosynthesis*
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Protein Transport
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Proteins / genetics
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Proteins / metabolism
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RNA, Messenger / genetics
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RNA, Messenger / metabolism
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RNA-Binding Proteins / genetics*
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RNA-Binding Proteins / metabolism
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Rats
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Recombinant Fusion Proteins
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Regulatory Sequences, Nucleic Acid / genetics
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Spindle Apparatus / chemistry
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Spindle Apparatus / genetics
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Spindle Apparatus / metabolism*
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Transcription Factors / genetics*
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Transcription Factors / metabolism
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Xenopus Proteins*
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Xenopus laevis / embryology*
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Xenopus laevis / genetics*
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mRNA Cleavage and Polyadenylation Factors*
Substances
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Bub3 protein, Xenopus
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Ccnb1 protein, rat
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Cell Cycle Proteins
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Cpeb1 protein, Xenopus
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Cyclin B
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Cyclin B1
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Microtubule-Associated Proteins
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Proteins
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RNA, Messenger
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RNA-Binding Proteins
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Recombinant Fusion Proteins
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Transcription Factors
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Xenopus Proteins
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mRNA Cleavage and Polyadenylation Factors
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Poly A