Has a role in endoderm cell specification and pharyngeal development. Required for the migration of epithelial cells, organization of the anterior seam cells and ceh-13 expression during embryo morphogenesis. Prevents hyperactivation of the Wnt signaling pathway during endoderm development, probably by preventing hmp-2 nuclear translocation. During larval development, apr-1 is required for expression of lin-39 in P3-8.p. Shown to negatively regulate Wnt signaling in vulval precursor cells. Has a role in cell division by establishing the polarity of the mother cell which forms the asymmetries of the daughter nuclei. Thought to regulate export of wrm-1 from the nucleus possibly as part of a complex involving pry-1. Interacts (via N-terminus) with bar-1 and hmp-2; the interaction with hmp-2 is relatively weak. Interacts (via C-terminus) with pry-1 (via N-terminus). Probably associates with bar-1, gsk-3, pry-1 in a complex (By similarity). Found in clusters near the ends of microtubules that extend into regions of actively migrating plasma membranes. Shuttles between the cytoplasm and nucleus (By similarity). Belongs to the adenomatous polyposis coli (APC) family.