Enables DNA-binding transcription factor activity, RNA polymerase II-specific and RNA polymerase II cis-regulatory region sequence-specific DNA binding activity. Involved in several processes, including nervous system development; neural crest cell migration; and positive regulation of morphogenesis of an epithelium. Acts upstream of or within several processes, including animal organ development; glial cell differentiation; and regulation of gene expression. Located in cytoplasm and nucleus. Part of transcription regulator complex. Is expressed in several structures, including alimentary system; central nervous system; genitourinary system; limb; and sensory organ. Orthologous to human SOX8 (SRY-box transcription factor 8). [provided by Alliance of Genome Resources, Apr 2022]