Several genes contributing to PD pathogenesis have been identified, including α-synuclein, leucine-rich repeat kinase 2 (LRRK2), PTEN-induced kinase 1 (PINK1), and parkin (Abou-Sleiman et al., 2006; Ferreira and Massano, 2017). Here, LRRK2 is linked to Parkinson disease.