Autoregulation of XTcf-4 depends on a Lef/Tcf site on the XTcf-4 promoter.

The restricted expression of XTcf-4 in the anterior midbrain is regulated via an active wnt/beta-catenin pathway (Kunz et al.,2004, Dev Biol 273:390-401). The molecular mechanism of this autoregulatory loop, however, remained elusive.

CHD4/Mi-2beta activity is required for the positioning of the mesoderm/neuroectoderm boundary in Xenopus.

Experiments in Xenopus have illustrated the importance of extracellular morphogens for embryonic gene regulation in vertebrates. Much less is known about how induction leads to the correct positioning of boundaries; for example, between germ layers. Here we report that the neuroectoderm/mesoderm boundary is controlled by the chromatin remodeling ATPase CHD4/Mi-2beta.