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First published online 24 November 2005
doi: 10.1242/dev.02144
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Division of Developmental Biology, Cincinnati Children's Hospital Research Foundation, 3333 Burnet Avenue, Cincinnati, OH 45229-3039, USA
* Author for correspondence (e-mail: heabq9{at}chmcc.org)
Accepted 4 October 2005
Xenopus Vg1, a transforming growth factor ß (Tgfß) family member, was one of the first maternally localized mRNAs identified in vertebrates. Its restriction to the vegetal pole of the egg made it the ideal candidate to be the mesoderm-inducing signal released by vegetal cells, but its function in vivo has never been resolved. We show that Vg1 is essential for Xenopus embryonic development, and is required for mesoderm induction and for the expression of several key Bmp antagonists. Although the original Vg1 transcript does not rescue Vg1-depleted embryos, we report that a second allele is effective. This work resolves the mystery of Vg1 function, and shows it to be an essential maternal regulator of embryonic patterning.
Key words: Vg1, Tgfß, Xenopus, Antisense, Bmp antagonist, Maternal localization
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