Enables DNA-binding transcription factor activity, RNA polymerase II-specific; cis-regulatory region sequence-specific DNA binding activity; and identical protein binding activity. Involved in several processes, including hepatocyte differentiation; protein-DNA complex assembly; and regulation of gene expression. Located in nucleus. Human ortholog(s) of this gene implicated in kidney disease; maturity-onset diabetes of the young type 5; pancreas disease; renal cell carcinoma; and type 2 diabetes mellitus. Orthologous to human HNF1B (HNF1 homeobox B). [provided by Alliance of Genome Resources, Apr 2022]