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Development, Vol 128, Issue 1 35-44, Copyright © 2001 by Company of Biologists
JOURNAL ARTICLES |
R Carballada, H Yasuo and P Lemaire
Laboratoire de Genetique et Physiologie du Developpement, Institut de Biologie du Developpement de Marseille, CNRS-INSERM-Universite de la Mediterrannee-AP de Marseille, Campus de Luminy Case 907, F-13288 Marseille Cedex 9, France.
Phosphoinositide 3-kinases (PI3Ks) are lipid kinases that can phosphorylate phosphaditylinositides leading to the cell type-specific regulation of intracellular protein kinases. PI3Ks are involved in a wide variety of cellular events including mitogenic signalling, regulation of growth and survival, vesicular trafficking, and control of the cytoskeleton. Some of these enzymes also act downstream of receptor tyrosine kinases or G-protein-coupled receptors. Using two strategies to inhibit PI3K signalling in embryos, we have analysed the role of PI3Ks during early Xenopus development. We find that a class 1A PI3K catalytic activity is required for the definition of trunk mesoderm during the blastula stages, but is less important for endoderm and prechordal plate mesoderm induction or for organiser formation. It is required in the FGF signalling pathway downstream of Ras and in parallel to the extracellular signal-regulated kinase (ERK) MAP kinases. In addition, our results show that ERKs and PI3Ks can synergise to convert ectoderm into mesoderm. These data provide the first evidence that class 1 PI3Ks are required for a specific set of patterning events in vertebrate embryos. Furthermore, they bring new insight into the FGF signalling cascade in Xenopus.
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