Enables DNA-binding transcription factor activity; transcription cis-regulatory region binding activity; and transcription coactivator activity. Acts upstream of or within positive regulation of transcription by RNA polymerase II. Located in nucleus. Is expressed in several structures, including branchial arch; central nervous system; early conceptus; genitourinary system; and sensory organ. Used to study Phelan-McDermid syndrome and autism spectrum disorder. Orthologous to human TCF20 (transcription factor 20). [provided by Alliance of Genome Resources, Apr 2022]