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Mol Cell 1999 Oct 01;44:487-98. doi: 10.1016/s1097-2765(00)80200-2.
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Regulation of Wnt signaling by Sox proteins: XSox17 alpha/beta and XSox3 physically interact with beta-catenin.

Zorn AM , Barish GD , Williams BO , Lavender P , Klymkowsky MW , Varmus HE .

Using a functional screen in Xenopus embryos, we identified a novel function for the HMG box protein XSox17 beta. Ectopic expression of XSox17 beta ventralizes embryos by inhibiting the Wnt pathway downstream of beta-catenin but upstream of the Wnt-responsive gene Siamois. XSox17 beta also represses transactivation of a TCF/LEF-dependent reporter construct by Wnt and beta-catenin. In animal cap experiments, it both activates transcription of endodermal genes and represses beta-catenin-stimulated expression of dorsal genes. The inhibition activity of XSox17 beta maps to a region C-terminal to the HMG box; this region of XSox17 beta physically interacts with the Armadillo repeats of beta-catenin. Two additional Sox proteins, XSox17 alpha and XSox3, likewise bind to beta-catenin and inhibit its TCF-mediated signaling activity. These results reveal an unexpected mechanism by which Sox proteins can modulate Wnt signaling pathways.

PubMed ID: 10549281
Article link: Mol Cell
Grant support: [+]

Species referenced: Xenopus
Genes referenced: a2m ctnnb1 lef1 lgals4.2 nodal3.1 nodal3.2 sia1 sox17a sox17b.1 sox17b.2 sox3 tcf4 tcf7l1 wnt1 wnt8a

Phenotypes: Xla Wt + HA-sox17b{del945_1119} + ctnnb1{tm1} (fig.5.b) [+]

Article Images: [+] show captions