Figure 5

The putative model of Xbra-Smad-1-mediated synergistic regulation of ventx1.1 transcriptional activation and neurogenesis inhibition in VMZ during early Xenopus development. The putative synergistic transcriptional activation of ventx1.1 (−180) promoter is regulated by the physical interaction of Smad-1 and Xbra in Xenopus embryos. BMP-4/Smad-1 and FGF/Xbra mediate a crosstalk in VMZ, inhibiting neurogenesis in a Ventx1.1-dependent manner during embryonic development of Xenopus.