Mutations in the GBA1 gene have been associated with Parkinson's disease (PD), the second most common neurodegenerative disorder after Alzheimer's disease, characterized by slow movements accompanied by decrement and degradation of repetitive movements (Mitsui et al., 2009; Sidransky et al., 2009; Shachar et al., 2011; Blanz and Saftig, 2016; Migdalska-Richards and Schapira, 2016). The gene discussed is GBA1; the disease is Parkinson disease.