To date, numerous PD-causative genes have been identified, among which six are most frequently cited: α-syn (PARK1), Parkin (PARK2), PTEN-induced putative kinase 1 (PINK1), DJ-1 (PARK7), Leucine-rich repeat kinase 2 (LRRK2), and Glucocerebrosidase (GBA) [1]. Here, GBA1 is linked to Parkinson disease.