Histone-lysine N-methyltransferase SUV39H1 (SUV39H1)

Histone-lysine N-methyltransferase SUV39H1 is a nuclear enzyme encoded by the SUV39H1 gene in humans and functions as a specific histone methyltransferase, catalyzing the di- and trimethylation of lysine 9 on histone H3 (H3K9). This modification is a hallmark of constitutive heterochromatin and leads to the recruitment of heterochromatin protein 1 (HP1), promoting chromatin compaction and stable gene silencing[1][2][3][4][7][10]. SUV39H1 contains both a chromodomain (involved in binding methylated lysines) and a SET domain that confers its methyltransferase activity. It propagates heterochromatin along chromosomes, regulates gene expression, is necessary for centromere function and chromosome segregation during mitosis, and is an essential component of epigenetic gene regulation. Loss or inhibition of SUV39H1 results in genomic instability and has been implicated in carcinogenesis due to inappropriate gene activation[1][2][3][7][10]. Its catalytic activity depends on RNA-mediated chromatin localization and a feedback loop involving recognition of its own modifications[5][6][7]. Because dysregulation of heterochromatin dynamics is linked to several human diseases, including cancer, SUV39H1 is considered a potential epigenetic drug target[3][5][7][10].

Other names

Suppressor of variegation 3-9 homolog 1KMT1ASu(var)3-9 homolog 1Suv39h1

Inhibition of H3K9 methylation to prevent or reverse heterochromatin formation and gene silencing