KAT5 and triple-A syndrome: The mRNA expression of histone acetyltransferases KAT2A, KAT2B, KAT3A, KAT3B, KAT5, KAT6A, KAT6B, KAT7, and KAT8 belonging to the GNAT, p300/CBP, and MYST family of KATs was significantly higher in AAA than in healthy control tissue (Fig. 1).