Participates in the Wnt signaling pathway which affects cell fate and may regulate the stem cell divisions of seam cells during larval development (PubMed:10952315). Functions as a transcriptional activator but is dependent on the interaction with pop-1 (PubMed:10952315). Involved in maintaining lin-39 Hox expression and regulating glr-1 abundance at the synapses (PubMed:15820693). Required for mab-5 expression during Q neuroblast migration and for oxidative stress-induced daf-16 signaling (PubMed:9834184, PubMed:15905404). 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 (PubMed:9716532, PubMed:9834184, PubMed:11063687, PubMed:11560894, PubMed:12441291, PubMed:15905404). Functionally redundant to wrm-1 and hmp-2 (PubMed:11560894). In the intestine, plays a role in probiotic-mediated protection against infections by pathogens such as S.enterica (PubMed:35263319). Interacts with apr-1 (PubMed:11560894). Interacts with axl-1 (PubMed:17601533). Interacts with daf-16 (PubMed:15905404). Interacts with lin-23 (PubMed:15820693). and. Interacts with pop-1 (via acidic region in N-terminus 1-44) (PubMed:10952315, PubMed:11560894). Interacts (via ARM repeats) with pry-1 (PubMed:12023307). Mostly cytoplasmic. Expressed in body wall muscle cells, hypodermal seam cells, gonad sheath cells and vulval precursor cells. Detected throughout development from L1 to L4 and during adulthood (PubMed:15282167). Expressed in P3.p to P8.p vulval precursor cells in the late L1 and early L2 larval stage (PubMed:9716532). Not expressed in vulval precursor cells P1.p, P2.p, P9.p, P10.p or P11.p in the mid-L3 larval stage (PubMed:9716532). Expressed in other postembryonic cells including seam cells (PubMed:9716532). Abnormalities in vulval development due to incorrect cell fate specification, resulting in the following phenotypes, multivulva (Muv), protruding vulva (Pvl) and egg laying defective (Egl) (PubMed:9716532, PubMed:11063687, PubMed:11560894, PubMed:12441291). Mutants also show defects in Q neuroblast migration, uncoordinated movement (Unc) and reduced superoxidase dismutase levels (PubMed:15905404). Mutants can be rescued by wrm-1 and hmp-2 when expressed from the bar-1 promoter (PubMed:11560894). Double knockout with dpy-22 result in reduced body length, male tail morphology abnormalities (Mab) and dauer induction (PubMed:12441291). RNAi-mediated knockdown in the intestine decreases E.faecium-mediated protection against S.enterica infection (PubMed:35263319). Belongs to the beta-catenin family. Alleles mu63 and mu349 were originally reported (PubMed:9834184) as the mutations L130F and Q147STOP respectively. This is in conflict with WormBase and more recent literature (PubMed:15282167) which is represented in this entry.