Participates in the Wnt signaling pathway which affects cell fate and may regulate the stem cell divisions of seam cells during larval development. Functions as a transcriptional activator but is dependent on the interaction with pop-1. Involved in maintaining lin-39 Hox expression and regulating glr-1 abundance at the synapses. Required for mab-5 expression during Q neuroblast migration and for oxidative stress-induced daf-16 signaling. Has roles in egg laying, vulva precursor cell fate determination, Q neuroblast migration, posterior ectodermal cell P12 specification, movement, body length, male tail development and dauer induction. Functionally redundant to wrm-1 and hmp-2 (By similarity). Interacts with apr-1, axl-1, daf-16, lin-23, and pop-1 (via acidic region in N-terminus 1-44). Interacts (via ARM repeats) with pry-1 (By similarity). Mostly cytoplasmic. Belongs to the beta-catenin family.