A fine mapping association study of 43 genes located in the 6q25–q27 region identified several SNPs located within the promoter region shared by two genes—PRKN (formerly PARK2, a well-known early onset Parkinson disease gene) and PACRG—associated with leprosy susceptibility in Vietnamese families (Mira et al. 2004). Here, PRKN is linked to Parkinson disease.