α-Synuclein (αSYN; SNCA) is one of the key molecules involved in familial and sporadic Parkinson’s disease (PD) [1–5]; genomic multiplication and point mutations in the α-synuclein gene (SNCA) are known to be causal factors for the familial parkinsonism forms of PD, PARK1 and PARK4 [6–9]. Here, SNCA is linked to Parkinson disease.