We identified a higher frequency of the functionally impaired BCHE-K variant (rs1803274) in AD and PD compared to controls and lower than in the GTEx dataset of healthy individuals (n = 651); in comparison, the prevalence of the 5′-UTR (rs1126680) and intron 2 (rs55781031) single-nucleotide polymorphisms (SNPs) of BCHE and ACHE’s 3′-UTR (rs17228616) which disrupt AChE mRNA targeting by miR-608 remained unchanged. The gene discussed is BCHE; the disease is Parkinson disease.