ARL17A and Parkinson disease: Of the identified genes, five genes (MAPT [MIM: 157140], CRHR1 [MIM: 122561], KANSL1 [MIM: 612452], ARL17A, and ARHGAP27 [MIM: 610591]) were found to be significant across 97 tested associations and three NDDs (AD, PD, and PSP).