Enables several functions, including chromatin binding activity; identical protein binding activity; and transcription coregulator activity. Involved in positive regulation of transcription by RNA polymerase II. Acts upstream of or within regulation of transcription, DNA-templated. Located in nucleus. Is expressed in several structures, including alimentary system; central nervous system; genitourinary system; immune system; and skin. Orthologous to human ARID3A (AT-rich interaction domain 3A). [provided by Alliance of Genome Resources, Apr 2022]