This is the peer reviewed version of the following article: [Gan‐Or, Z., Alcalay, R.N., Makarious, M.B., Scholz, S.W., and Blauwendraat, C. (2019). Classification of GBA Variants and Their Effects in Synucleinopathies. Movement Disorders 34, 1581–1582.], which has been published in final form at https://doi.org/10.1002/mds.27803. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. Deposited by shareyourpaper.org and openaccessbutton.org. We've taken reasonable steps to ensure this content doesn't violate copyright. However, if you think it does you can request a takedown by emailing help@openaccessbutton.org.