Enables several functions, including chromatin binding activity; ubiquitin binding activity; and ubiquitin modification-dependent histone binding activity. Involved in negative regulation of transcription by RNA polymerase II; regulation of histone methylation; and stem cell differentiation. Acts upstream of or within several processes, including cellular response to leukemia inhibitory factor; hematopoietic or lymphoid organ development; and regulation of gene expression. Located in nucleus. Part of ESC/E(Z) complex. Is expressed in several structures, including alimentary system; cardiovascular system; genitourinary system; nervous system; and sensory organ. Human ortholog(s) of this gene implicated in autistic disorder. Orthologous to human JARID2 (jumonji and AT-rich interaction domain containing 2). [provided by Alliance of Genome Resources, Apr 2022]