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First published online 17 November 2004
doi: 10.1242/dev.01528

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EDEN-BP-dependent post-transcriptional regulation of gene expression in Xenopus somitic segmentation

Carole Gautier-Courteille, Christophe Le Clainche^*, Carine Barreau, Yann Audic, Antoine Graindorge, Dominique Maniey, H. Beverley Osborne and Luc Paillard

CNRS UMR 6061, IFR 97, Faculté de Médecine, Université Rennes 1, 2 avenue Léon Bernard, CS 34317, 35043 Rennes Cedex, France

Author for correspondence (e-mail: luc.paillard{at}univ-rennes1.fr)

Accepted 12 October 2004

EDEN-BP is a Xenopus RNA-binding protein that triggers deadenylation [poly(A) tail shortening], and thereby translational repression and degradation, of a subset of maternal mRNAs soon after fertilization. We show here that this factor is expressed in the presomitic mesoderm of older embryos, the site where somitic segmentation takes place. Inhibiting EDEN-BP function using either antisense morpholino oligonucleotides or neutralizing antibodies leads to severe defects in somitic segmentation, but not myotomal differentiation. This is associated with defects in the expression of segmentation markers belonging to the Notch signalling pathway in the presomitic mesoderm. We show by a combination of approaches that the mRNA encoding XSu(H), a protein that plays a central role in Notch signalling, is regulated by the EDEN-BP pathway. Accordingly, XSu(H) is overexpressed in EDEN-BP knock-down embryos, and overexpressing XSu(H) causes segmentation defects. We finally give data indicating that, in addition to XSu(H), other segmentation RNAs are a target for EDEN-BP. These results show that EDEN-BP-dependent post-transcriptional regulation of gene expression is required for the process of somitic segmentation.

Key words: mRNA stability, Poly(A) tail, Metamerization, Notch, Suppressor of Hairless/RBP-J

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