KAT5 and Huntington disease: We next used ChIP to assess acetylation enrichment at four repressed synaptic plasticity gene loci (sh, dlg, futsch, dsh) in PD, HD and ALS larval brains using Abs to well characterized Tip60-mediated cognition linked histone acetylated (Ac) marks AcH4K12 and AcH4K16.