Has a role in non-canonical Wnt/planar cell polarity (PCP) signaling; can recruit dvl/dsh and prickle from the cytoplasm to the plasma membrane. Acts in a PCP complex to regulate the polarized assembly of fibronectrin on the surface of the mesoderm during gastrulation. Regulates convergent extension in both dorsal mesoderm and neural tissue without affecting cell fate. Regulates neural fold closure during neurulation (PubMed:12074560, PubMed:15854914). May be required for cell surface localization of fzd3 and fzd6 in the inner ear (By similarity). Interacts with dvl/dsh (By similarity). Interacts with prickle3 (PubMed:27658614, PubMed:26079437). Cell membrane localization is regulated by prickle. During gastrulation, broadly expressed in the dorsal region in both mesodermal and neural tissues. From the neurula stages, expressed throughout the neural tube. In tailbud stages, expression declines in the anterior notochord but remains strong in the posterior notochord and in the neural tube. Also weakly expressed in the prenephritic region of late tailbud embryos. Expressed both maternally and zygotically throughout early development. Maternal expression declines gradually by the early gastrula stage (stage 10). Zygotic expression increases by late gastrula stage (stage 12) with strong expression from the midneurula stage (stage 15) onward. Belongs to the Vang family.