Candidate genes which have been reported to be associated with PD include e.g., β-glucocerebrosidase (GBA), diacylglycerol kinase θ, 110kD (GAK-DGKQ), SNCA, human leukocyte antigen (HLA), RAD51B, DYRK1A, CHCHD2, VPS35, RAB39B or TMEM230 [84,85]. This evidence concerns the gene SNCA and Parkinson disease.