Acetylcholinesterase (AChE) inhibitors are used as symptomatic therapies for AD [26,66,67], while catechol-O-methyl transferase (COMT) [68,69,70,71] and monoamine oxidase B (MAOB) [72,73,74,75] inhibitors are used for PD. This evidence concerns the gene ACHE and Parkinson disease.