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Research Papers
Department of Pharmacology, State University of New York, Stony Brook 11794-8651.
Abstract
The cytoplasmic polyadenylation element (CPE) is an AU-rich sequence in the 3'-untranslated region of many stored maternal mRNAs. The CPE directs the meiotic maturation-specific cytoplasmic polyadenylation and translational activation of these dormant mRNAs in Xenopus. The work presented here demonstrates that the CPE controls a similar regulation in mouse oocytes and utilizes the information to isolate novel maternal mRNAs by polymerase chain reaction (PCR). A degenerate CPE primer was used in an anchored PCR reaction with cDNAs from primary mouse oocytes. Clones were identified that contained the canonical polyadenylation signal AATAAA. A novel PCR test was then used to determine the polyadenylation state of the respective mRNAs before and after meiotic maturation. Two mRNAs, OM-1 and OM-2, are cytoplasmically polyadenylated upon maturation. Another mRNA is not polyadenylated during maturation, although it contains multiple CPE-like elements, indicating that this sequence element is not sufficient for adenylation during this time. Microinjection into primary oocytes of antisense oligodeoxynucleotides directed against OM-1 destroys the mRNA but does not appear to interfere with maturation in vitro. These experiments identify two novel maternal mRNAs and establish a simple strategy for isolating other maternal messages that control meiotic maturation, fertilization, and early mouse development.
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