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EMBO J
1998 Jan 02;171:278-87. doi: 10.1093/emboj/17.1.278.
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EDEN and EDEN-BP, a cis element and an associated factor that mediate sequence-specific mRNA deadenylation in Xenopus embryos.
Paillard L
,
Omilli F
,
Legagneux V
,
Bassez T
,
Maniey D
,
Osborne HB
.
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During Xenopus early development, gene expression is regulated mainly at the translational level by the length of the poly(A) tail of mRNAs. The Eg family and c-mos maternal mRNAs are deadenylated rapidly and translationally repressed after fertilization. Here, we characterize a short sequence element (EDEN) responsible for the rapid deadenylation of Eg5 mRNA. Determining the core EDEN sequence permitted us to localize the c-mos EDEN sequence. The c-mos EDEN confered a rapid deadenylation to a reporter gene. The EDEN-specific RNA-binding protein (EDEN-BP) was purified and a cDNA obtained. EDEN-BP is highly homologous to a human protein possibly involved in myotonic dystrophy. Immunodepleting EDEN-BP from an egg extract totally abolished the EDEN-mediated deadenylation activity, but did not affect the default deadenylation activity. Therefore, EDEN-BP constitutes the first trans-acting factor for which an essential role in the specificity of mRNA deadenylation has been directly demonstrated.
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