At present, more than 300 mutations have been linked to Gaucher disease (Hruska, LaMarca, Scott, & Sidransky, 2008), and the number of studies analyzing the prevalence and phenotype of GBA mutations in PD is rapidly increasing (Adler et al., 2017; Alcalay et al., 2015; Berge‐Seidl et al., 2017; Liu et al., 2016). Here, GBA1 is linked to Parkinson disease.