Enables several functions, including DNA-binding transcription activator activity, RNA polymerase II-specific; estrogen binding activity; and steroid binding activity. Involved in several processes, including animal organ development; regulation of neuron death; and response to steroid hormone. Located in several cellular components, including mitochondrion; perikaryon; and perinuclear region of cytoplasm. Part of protein-DNA complex. Used to study several diseases, including hypertension (multiple); obesity; peritonitis; prostate carcinoma in situ; and transient cerebral ischemia. Biomarker of asthma; brain ischemia; colitis; cystitis; and osteoporosis. Human ortholog(s) of this gene implicated in several diseases, including artery disease (multiple); autoimmune disease (multiple); hypospadias; neurodegenerative disease (multiple); and ovarian dysgenesis 8. Orthologous to human ESR2 (estrogen receptor 2). [provided by Alliance of Genome Resources, Apr 2022]