EHMT1 and Alzheimer disease: In respect to H3K9 levels, a significant rise in H3K9me2 levels and the respective H3K9 methyltransferase euchromatic histone methyltransferase 1 (EHMT1), also known as G9A-like protein (GLP), as well as the epigenetic-related recognition factor, bromodomain adjacent to the zinc finger 2B gene (BAZ2B), have been detected in the human prefrontal cortex of aged individuals and AD patients [46,47].