Of the six genes linked to inherited PD, SNCA (PARK1 &4) and LRRK2 (PARK8) cause autosomal-dominant forms, while Parkin(PARK2), PINK1 (PARK6), DJ-1 (PARK7), and ATP13A2 (PARK9) cause autosomal-recessiveforms (Table 1).13,29,94,96. Here, LRRK2 is linked to Parkinson disease.