Histone acetyltransferases (HATs) are epigenetic enzymes that relieve transcriptional repression by preferentially acetylation of ε-amino group of lysine residues on histones. In general, HATs are crucial for chromatin restructuring and transcriptional regulation in eukaryotic cells. HATs can be grouped into at least five different subfamilies (HAT1, Gcn5/PCAF, MYST, p300/CBP,...