SNCA and synucleinopathy: α-Synuclein, a product of the alpha-synuclein (SNCA) gene (Kisos et al., 2012; Watts et al., 2013; Djelloul et al., 2015; Burré et al., 2018; Coon and Singer, 2020), is an aggregation-prone protein that plays an important role in several synucleinopathies (Surguchev and Surguchov, 2017).