Enables chromatin binding activity; histone acetyltransferase regulator activity; and histone binding activity. Involved in canonical Wnt signaling pathway. Acts upstream of or within several processes, including animal organ development; positive regulation of chromatin binding activity; and spermatid nucleus differentiation. Located in nucleus. Is expressed in several structures, including alimentary system; brain; genitourinary system; respiratory system; and skin. Orthologous to human PYGO2 (pygopus family PHD finger 2). [provided by Alliance of Genome Resources, Apr 2022]