Acts upstream of or within positive regulation of synapse assembly. Predicted to be located in nucleus and plasma membrane. Predicted to be integral component of membrane. Is expressed in several structures, including brain; branchial arch; cranial ganglion; genitourinary system; and retina. Orthologous to human AMIGO2 (adhesion molecule with Ig like domain 2). [provided by Alliance of Genome Resources, Apr 2022]