Participates in the Wnt signaling pathway and modulates MYC expression by binding to its promoter in a sequence-specific manner. Acts as repressor in the absence of CTNNB1, and as activator in its presence. Activates transcription from promoters with several copies of the Tcf motif 5'-CCTTTGATC-3' in the presence of CTNNB1. TLE1, TLE2, TLE3 and TLE4 repress transactivation mediated by TCF7L2/TCF4 and CTNNB1. Expression of dominant-negative mutants results in cell-cycle arrest in G1. Necessary for the maintenance of the epithelial stem-cell compartment of the small intestine. Interacts with TGFB1I1. Interacts with CTNNB1 (via the armadillo repeat); forms stable transcription complex. Interacts with EP300. Interacts with NLK. Interacts with CCDC85B (probably through the HMG box); prevents interaction with CTNNB1. Interacts with TNIK. Interacts with MAD2L2; prevents TCF7L2/TCF4 binding to promZIPK/DAPK3oters, negatively modulating its transcriptional activity. Interacts with ZIPK/DAPK3. Interacts with XIAP/BIRC4 and TLE3. Detected in epithelium from small intestine, with the highest expression at the top of the crypts and a gradient of expression from crypt to villus. Detected in colon epithelium and colon cancer, and in epithelium from mammary gland and carcinomas derived therefrom. Belongs to the TCF/LEF family. 10 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.
Molecular Function: beta-catenin binding; gamma-catenin binding; nuclear hormone receptor binding; protein binding; protein kinase binding; sequence-specific DNA binding; transcription factor activity; transcription factor binding
Biological Process: blood vessel development; cell cycle arrest; cell proliferation; fat cell differentiation; glucose homeostasis; maintenance of DNA repeat elements; myoblast cell fate commitment; negative regulation of transcription factor activity; negative regulation of transcription from RNA polymerase II promoter; negative regulation of transcription, DNA-dependent; pancreas development; positive regulation of insulin secretion; positive regulation of protein binding; positive regulation of protein export from nucleus; positive regulation of protein kinase B signaling cascade; positive regulation of transcription from RNA polymerase II promoter; regulation of hormone metabolic process; regulation of smooth muscle cell proliferation; regulation of transcription from RNA polymerase II promoter; response to glucose stimulus; Wnt receptor signaling pathway through beta-catenin; Wnt receptor signaling pathway, calcium modulating pathway