Enables DNA-binding transcription factor activity, RNA polymerase II-specific and RNA polymerase II transcription regulatory region sequence-specific DNA binding activity. Involved in several processes, including negative regulation of epithelial cell proliferation; negative regulation of transcription by RNA polymerase II; and regulation of alpha-beta T cell differentiation. Acts upstream of or within several processes, including chondrocyte differentiation; hair follicle morphogenesis; and positive regulation of extrinsic apoptotic signaling pathway. Located in chromatin and nucleus. Is expressed in several structures, including alimentary system; genitourinary system; limb; nervous system; and sensory organ. Used to study asthma and inflammatory bowel disease. Human ortholog(s) of this gene implicated in several diseases, including breast cancer (multiple); female reproductive organ cancer (multiple); lung non-small cell carcinoma; pancreatic cancer; and urinary bladder cancer. Orthologous to human RUNX3 (RUNX family transcription factor 3). [provided by Alliance of Genome Resources, Apr 2022]