Participates in the Wnt signaling pathway. Probably binds to DNA and acts as a repressor in the absence of ctnnb1, and possibly as an activator in its presence. Regulates anterior-posterior patterning in the neuroectoderm by repressing posterior neural fates. Also required for hindbrain morphogenesis. Interacts with ctnnb1. Expressed maternally and throughout embryogenesis. Expressed in the rostral neuroectoderm and at low levels in the notochord following gastrulation. Expressed throughout the developing brain during somitogenesis. Belongs to the TCF/LEF family.