Multiple genes linked to the autosomal dominant form of PD, such as SNCA, LRRK2, and the autosomal recessive form of PD, such as PRKN, PINK1, PARK7 (DJ1), and ATP13A2 (PARK9), have been reported (1, 5, 7, 8, 9). This evidence concerns the gene LRRK2 and Parkinson disease.