Selective MAO-A inhibitors are used in the treatment of mental disorders and have found use in therapy as antidepressants and anxiolytics [11,12], while selective MAO-B inhibitors are used as adjuvants for the treatment of Alzheimer’s disease, Parkinson’s disease, and Huntington’s disease [13,14,15,16]. The gene discussed is MAOB; the disease is early-onset autosomal dominant Alzheimer disease.