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Nat Cell Biol. 2011 Jun 19;13(7):762-70. doi: 10.1038/ncb2283.

Opposing effects of Tcf3 and Tcf1 control Wnt stimulation of embryonic stem cell self-renewal.

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1
Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, 900 S Ashland Avenue, MBRB 2270, M/C 669, Chicago, Illinois 60607, USA.

Abstract

The co-occupancy of Tcf3 with Oct4, Sox2 and Nanog on embryonic stem cell (ESC) chromatin indicated that Tcf3 has been suggested to play an integral role in a poorly understood mechanism underlying Wnt-dependent stimulation of mouse ESC self-renewal of mouse ESCs. Although the conventional view of Tcf proteins as the β-catenin-binding effectors of Wnt signalling suggested Tcf3-β-catenin activation of target genes would stimulate self-renewal, here we show that an antagonistic relationship between Wnt3a and Tcf3 on gene expression regulates ESC self-renewal. Genetic ablation of Tcf3 replaced the requirement for exogenous Wnt3a or GSK3 inhibition for ESC self-renewal, demonstrating that inhibition of Tcf3 repressor is the necessary downstream effect of Wnt signalling. Interestingly, both Tcf3-β-catenin and Tcf1-β-catenin interactions contributed to Wnt stimulation of self-renewal and gene expression, and the combination of Tcf3 and Tcf1 recruited Wnt-stabilized β-catenin to Oct4 binding sites on ESC chromatin. This work elucidates the molecular link between the effects of Wnt and the regulation of the Oct4/Sox2/Nanog network.

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PMID:
21685894
PMCID:
PMC3129424
DOI:
10.1038/ncb2283
[Indexed for MEDLINE]
Free PMC Article

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