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. 1995 Nov 1;14(21):5230–5243. doi: 10.1002/j.1460-2075.1995.tb00208.x

The role of gsc and BMP-4 in dorsal-ventral patterning of the marginal zone in Xenopus: a loss-of-function study using antisense RNA.

H Steinbeisser 1, A Fainsod 1, C Niehrs 1, Y Sasai 1, E M De Robertis 1
PMCID: PMC394633  PMID: 7489713

Abstract

The dorsal-specific homeobox gene goosecoid (gsc) and the bone morphogenetic protein 4 gene (BMP-4) are expressed in complementary regions of the Xenopus gastrula. Injection of gsc mRNA dorsalizes ventral mesodermal tissue and can induce axis formation in normal and UV-ventralized embryos. On the other hand, BMP-4 mRNA injection, which has a strong ventralizing effect on whole embryos, has been implicated in ventralization by UV, and can rescue tail structures in embryos dorsalized by LiCl. The above-mentioned putative roles for BMP-4 and gsc are based on gain-of-function experiments. In order to determine the in vivo role of these two genes in the patterning of the Xenopus mesoderm during gastrulation, partial loss-of-function experiments were performed using antisense RNA injections. Using marker genes that are expressed early in gastrulation, we show that antisense gsc RNA has a ventralizing effect on embryos, whereas antisense BMP-4 RNA dorsalizes mesodermal tissue. These loss-of-function studies also show a requirement for gsc and BMP-4 in the dorsalization induced by LiCl and in the ventralization generated by UV irradiation, respectively. Thus, both gain- and loss-of-function results for gsc and BMP-4 support the view that these two genes are necessary components of the dorsal and ventral patterning pathways in Xenopus embryos.

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