Enables DNA-binding transcription repressor activity and RNA polymerase II transcription regulatory region sequence-specific DNA binding activity. Involved in several processes, including gamma-delta T cell differentiation; positive regulation of cell differentiation; and spinal cord oligodendrocyte cell differentiation. Acts upstream of or within regulation of gamma-delta T cell differentiation. Located in cytoplasm and nucleus. Is expressed in several structures, including 1st branchial arch; alimentary system; central nervous system; early conceptus; and genitourinary system. Orthologous to human SOX13 (SRY-box transcription factor 13). [provided by Alliance of Genome Resources, Apr 2022]