Enables Wnt-protein binding activity and signaling receptor activity. Involved in Wnt signaling pathway and positive regulation of neuron projection arborization. Predicted to be located in several cellular components, including cell surface; dendrite; and glutamatergic synapse. Predicted to be active in extracellular space. Human ortholog(s) of this gene implicated in exudative vitreoretinopathy 1. Orthologous to human FZD4 (frizzled class receptor 4). [provided by Alliance of Genome Resources, Apr 2022]