GAD1 and schizophrenia: A study using the postmortem PFC samples from schizophrenia patients has shown a significant hypoacetylation of H3K9K14 that is correlated with the expression of several schizophrenia-related genes, such as GAD1 (glutamic acid decarboxylase 1) and HTR2C (5-hydroxytryptamine receptor 2C; Tang et al., 2011).