The LRRK2 Gly2019Ser mutation was more common in PD index cases of North-African origin (100/221, 45.2%; 95% CI [38.7–51.8]) than in Europeans (36/1,530, 2.4%; 95% CI [1.7–3.2]) (Fisher's exact test: odds ratio (OR) = 34.3, 95% CI [22.0–53.8], p < 0.0001; Table 2). Here, LRRK2 is linked to Parkinson disease.