Enables several functions, including histone-lysine N-methyltransferase activity; nuclear receptor binding activity; and transcription corepressor activity. Involved in histone methylation and negative regulation of transcription by RNA polymerase II. Acts upstream of or within gastrulation with mouth forming second. Located in nucleus. Is expressed in several structures, including central nervous system; dorsal root ganglion; genitourinary system; long bone epiphysis; and retina. Human ortholog(s) of this gene implicated in Sotos syndrome; Sotos syndrome 1; acute myeloid leukemia; microcephaly; and neuroblastoma. Orthologous to human NSD1 (nuclear receptor binding SET domain protein 1). [provided by Alliance of Genome Resources, Apr 2022]