Investigation of the protein expression levels of prenyltransferase subunits revealed reduced expression of FNTA, PGGT1B, and RABGGTA in schizophrenia DLPFC.118 This suggests that all forms of prenylation—farnesylation, typical geranylgeranylation, and Rab-specific geranylgeranylation—may be impaired in schizophrenia. This evidence concerns the gene AGFG1 and schizophrenia.