Previous studies have shown that mutations on some genes (SNCA, UCHL1, GIGYF2, GBA, LRRK2, PRKN, PINK1, ATP13A2, PLA2G6, and FBXO7) could be the cause of PD, reviewed by Selvaraj and Piramanayagam (2019). The gene discussed is PRKN; the disease is Parkinson disease.