DOT1L encoded by this gene is a histone methyltransferase that methylates lysine-79 of histone H3. It is inactive against free core histones, but shows significant histone methyltransferase activity against nucleosomes. DOT1L (DOT1 Like Histone Lysine Methyltransferase) is a Protein Coding gene. Diseases associated with DOT1L include Diffuse Gastric Cancer and Leukemia, Acute Myeloid. Among its related pathways are Chromatin organization and Transcriptional misregulation in cancer.