GBA1 and Parkinson disease: α-synuclein (SNCA), Parkin, ubiquitin C-terminal hydrolase L1 (UCHL-1), PTEN-induced kinase 1 (PINK1), PARK7 (DJ-1), leucine-rich repeat kinase 2 (LRRK2), ATPase cation transporting 13A2 (ATP13A2), glucocerebrosidase (GBA), vacuolar protein sorting ortholog 35 (VPS35), Eukaryotic Translation Initiation Factor 4 Gamma 1 (EIF4G1), and PARK16 are identified as the causative genes of PD [49].