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Development 2004 Jul 01;13113:3069-80. doi: 10.1242/dev.01176.
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Sox17 and beta-catenin cooperate to regulate the transcription of endodermal genes.

Sinner D , Rankin S , Lee M , Zorn AM .

Recent studies have led to a model of the molecular pathway that specifies the endoderm during vertebrate gastrulation. The HMG box transcription factor Sox17 is a key component of this pathway and is essential for endoderm formation; however, the molecular events controlled by Sox17 are largely unknown. We have identified several direct transcriptional targets of Sox17, including Foxa1 and Foxa2. We show that beta-catenin, a component of Wnt signaling pathway, physically interacts with Sox17 and potentiates its transcriptional activation of target genes. We identify a motif in the C terminus of Sox17, which is conserved in all the SoxF subfamily of Sox proteins, and this motif is required for the ability of Sox17 to both transactivate target genes and bind beta-catenin. Nuclear beta-catenin is present in endoderm cells of the gastrula, and depletion of beta-catenin from embryos results in a repression of Sox17 target genes. These data suggest that in a mechanism analogous to Tcf/Lef interacting with beta-catenin, Sox17 and beta-catenin interact to transcribe endodermal target genes.

PubMed ID: 15163629
Article link: Development
Grant support: [+]

Species referenced: Xenopus laevis
Genes referenced: a2m cer1 ctnnb1 foxa1 foxa2 gata4 gata6 gsc hhex hnf1b jup lgals4.2 mixer nodal nodal1 nodal2 odc1 ptk2b sia1 sox17a sox17b.1 sox17b.2 sox3 tcf3
Morpholinos: ctnnb1 MO1

Phenotypes: Xla Wt + Activin + CHX + animal cap explant (fig.2) [+]

Article Images: [+] show captions