Enables DNA-binding transcription activator activity, RNA polymerase II-specific and RNA polymerase II cis-regulatory region sequence-specific DNA binding activity. Involved in regulation of transcription, DNA-templated and sulfur compound metabolic process. Acts upstream of or within positive regulation of transcription by RNA polymerase II. Located in nucleoplasm. Human ortholog(s) of this gene implicated in congenital hypothyroidism and congenital nongoitrous hypothyroidism 2. Orthologous to human PAX8 (paired box 8). [provided by Alliance of Genome Resources, Apr 2022]