SNCA and Parkinson disease: The genes which have been most robustly implicated in Mendelian forms of PD include SNCA (5), LRRK2 (6), PARK2 (7), ATP13A2 (8), PINK1 (9), DJ-1 (10), VPS35 (11), DNAJC13 (12), and GBA (13) [see (14–16) for a review].