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Development, Vol 114, Issue 1 261-269, Copyright © 1992 by Company of Biologists
JOURNAL ARTICLES |
D Kimelman and A Maas
Department of Biochemistry, University of Washington, Seattle 98103.
Peptide growth factors from the fibroblast growth factor (FGF) and transforming growth factor-beta families are likely regulators of mesoderm formation in the early Xenopus embryo. Although basic FGF is found in the Xenopus embryo at the correct time and at sufficient concentrations to suggest that it is the FGF-type inducer, the lack of a secretory signal sequence in the basic FGF peptide has raised questions as to its role in the inductive process. We show here that Xenopus basic FGF can ectopically induce mesoderm when translated from injected synthetic RNA within the cells of a Xenopus embryo. Basic FGF produced in this manner is able to induce the formation of both dorsal and ventral mesoderm with the type of mesoderm formed dependent on the inherent dorsal-ventral polarity of the animal hemisphere. Surprisingly, although Xenopus basic FGF produced from the injected mRNA has a potent mesodermalizing effect on animal hemisphere cells, virtually no phenotypic effect is observed with intact embryos. These results suggest that the role of Xenopus basic FGF is to specify the size of the marginal zone, and synergistically with a dorsally localized prepatterning signal, to initially establish the dorsal-ventral axis of the mesoderm.
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