Function of Wnt/β-catenin in counteracting Tcf3 repression through the Tcf3-β-catenin interaction.

Development
Chun-I WuBradley J Merrill

Abstract

The canonical Wnt/β-catenin signaling pathway classically functions through the activation of target genes by Tcf/Lef-β-catenin complexes. In contrast to β-catenin-dependent functions described for Tcf1, Tcf4 and Lef1, the known embryonic functions for Tcf3 in mice, frogs and fish are consistent with β-catenin-independent repressor activity. In this study, we genetically define Tcf3-β-catenin functions in mice by generating a Tcf3ΔN knock-in mutation that specifically ablates Tcf3-β-catenin. Mouse embryos homozygous for the knock-in mutation (Tcf3(ΔN/ΔN)) progress through gastrulation without apparent defects, thus genetically proving that Tcf3 function during gastrulation is independent of β-catenin interaction. Tcf3(ΔN/ΔN) mice were not viable, and several post-gastrulation defects revealed the first in vivo functions of Tcf3-β-catenin interaction affecting limb development, vascular integrity, neural tube closure and eyelid closure. Interestingly, the etiology of defects indicated an indirect role for Tcf3-β-catenin in the activation of target genes. Tcf3 directly represses transcription of Lef1, which is stimulated by Wnt/β-catenin activity. These genetic data indicate that Tcf3-β-catenin is not necessary to activate target...Continue Reading

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