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XB-ART-44207
Genes Dev 2011 Sep 01;2517:1759-62. doi: 10.1101/gad.17594311.
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Wnt signaling meets internal dissent.

Grove EA .


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In canonical Wnt signaling, β-catenin translocates to the cell nucleus, interacting with Tcf/Lef factors to activate transcription of Wnt target genes. In this issue of Genes & Development, Vacik and colleagues (pp. 1783-1795) report that a highly conserved sequence in intron 5 of Tcf7l2 conceals an internal promoter region that, when activated by Vax2, drives transcription of truncated Tcf7l2 mRNAs. The encoded Tcf7l2 protein binds to DNA, but not β-catenin, and therefore acts as a dominant-negative Wnt antagonist.

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Species referenced: Xenopus laevis
Genes referenced: ctnnb1 tcf7l2 vax2

References [+] :
Aberle, beta-catenin is a target for the ubiquitin-proteasome pathway. 1997, Pubmed