The most cited literature was “Alpha-synuclein in Lewy bodies (Spillantini et al., 1997)” (383 citations), followed by “Mutation in the alpha-synuclein gene identified in families with Parkinson’s disease (Polymeropoulos et al., 1997)” (364 citations) and “Staging of brain pathology related to sporadic Parkinson’s disease (Braak et al., 2003)” (268 citations) (Table 5). Here, SNCA is linked to Parkinson disease.