Histone methyltransferase involved in left-right axis specification in early development and mitosis. Specifically trimethylates 'Lys-9' of histone H3 (H3K9me3). H3K9me3 is a specific tag for epigenetic transcriptional repression that recruits HP1 (CBX1, CBX3 and/or CBX5) proteins to methylated histones. Contributes to H3K9me3 in both the interspersed repetitive elements and centromere-associated repeats. Plays a role in chromosome condensation and segregation during mitosis.
Ubiquitous. Highest expression in heart, testis and ovary.
Belongs to the histone-lysine methyltransferase family. Contains 1 MBD (methyl-CpG-binding) domain. Contains 1 pre-SET domain. Contains 1 SET domain.