The G2019S variant is the most frequent LRRK2 pathogenic variant: It is found in 10% of familial PD cases, 1% to 2% of all PD cases,5 3% in Europeans, 16% to 19% in Ashkenazi Jews, and up to 42% in African Arab‐Berbers6 and in most other populations investigated with the exception of several Asian populations.7 The gene discussed is LRRK2; the disease is Parkinson disease.