SYNJ1 and Parkinson disease: The autosomal recessive (AR) inheritance pattern of PD is associated with the Parkin gene (PARK2), PINK-1 gene (PARK6), and DJ-1 gene (PARK7), while several other rare forms of PD include mutations in the ATP13A2 gene (ATPase 13A2; PARK9), FBXO7 gene (F box 7 protein; PARK15), DNAJ6 gene (PARK19), SYNJ1 gene (PARK20), and VPS13C gene (PARK23).