Enables DNA binding activity; chromatin binding activity; and histone methyltransferase activity (H3-K4 specific). Involved in several processes, including definitive hemopoiesis; regulation of gene expression; and regulation of histone modification. Acts upstream of or within several processes, including hematopoietic or lymphoid organ development; macromolecule methylation; and regulation of histone modification. Located in nucleus. Is expressed in several structures, including extraembryonic component; genitourinary system; hematopoietic system; nervous system; and retina. Used to study acute lymphoblastic leukemia and acute myeloid leukemia. Human ortholog(s) of this gene implicated in acute myeloid leukemia; cervical cancer; mixed phenotype acute leukemia; and non-Hodgkin lymphoma. Orthologous to human KMT2A (lysine methyltransferase 2A). [provided by Alliance of Genome Resources, Apr 2022]