Lysine acetylation of histones is one of the major epigenetic regulators of chromatin conformation and gene expression. The dynamic nature of histone acetylation is determined by the counterbalancing activity of histone acetyltransferase and histone deacetylase (HDAC) enzymes. Acetylation of histones is generally associated with open and transcriptionally active chromatin, whereas the activity of HDACs leads to histone deacetylation, condensation of chromatin, and inhibition of transcription.