PD-related genes have been discovered, for example, α-synuclein, Parkin, PINK1 (phosphatase and tensin homologue-induced putative kinase 1), LRRK2 (leucine-rich repeat kinase 2), and DJ-1 (also known as Parkinson disease protein 7 [PARK7]). This evidence concerns the gene LRRK2 and Parkinson disease.