Of the various genes identified as biomarkers, some are associated with autosomal recessive inheritance, particularly Parkin and PINK1, which are associated with typical early-onset PD [15]; others are related to atypical juvenile PD, such as ATP13A2, DNAJC6, FBOX7, and SYNJ1 [16], whereas SNCA, LRRK2, and VPS35 are associated with typical autosomal dominant PD [17]. The gene discussed is SNCA; the disease is Parkinson disease.