LINGO1 and Parkinson disease: Among them, LINGO1 rs9652490 and SLC1A2 rs3794087 were two lead single nucleotide polymorphisms of previous small genome‐wide association studies in ET.7, 8, 9 PPARGC1A rs17590046 was also proved to be associated with essential tremor recently.10 But they showed controversial associations in PD studies.