Moreover, a number of promising targets were identified by such studies and have been regarded as potential therapeutic targets or disease biomarkers for PD (e.g. NR4A2, ULK1, OR51E2, NRF2, FTL, GGH and BSCL2).16, 17, 18, 19, 20, 21. This evidence concerns the gene OR51E2 and Parkinson disease.