Enables chromatin DNA binding activity and transcription coactivator activity. Involved in circadian regulation of gene expression and negative regulation of histone deacetylase activity. Acts upstream of or within histone H3-K4 demethylation and negative regulation of transcription by RNA polymerase II. Located in nucleus. Part of protein-DNA complex. Is expressed in several structures, including 1st branchial arch; early conceptus; genitourinary system; limb; and sensory organ. Human ortholog(s) of this gene implicated in ankylosing spondylitis. Orthologous to human KDM5A (lysine demethylase 5A). [provided by Alliance of Genome Resources, Apr 2022]