Other chronic diseases, particularly Parkinson’s disease (PD), a neurodegenerative disorder associated with the build-up of α-synuclein protein and death of dopaminergic neurons, and type 2 diabetes mellitus (T2DM) are increasing in prevalence at similarly alarming rates (Boyle et al., 2010; Rocca, 2018). Here, SNCA is linked to type 2 diabetes mellitus.