GAK and Parkinson disease: We identified 14 genes (BST1, CD38, CTSB, EFNA3, GAK, GPNMB, HLA-DRB5, HIP1R, PRSS8, RAB29, STX4, TMEM175, TTC19 and VKORC1) associated with the risk of PD using PD MTAG (Supplementary Table 8).