VPS13B and Cohen syndrome: VPS13A loss‐of‐function pathogenic variants are characterized by a spectrum of movement disorders (chorea acanthocytosis, dystonia, tics, and sometimes parkinsonism; Rampoldi et al, 2001), Vps13B (also called COH1) mutations cause microcephaly (i.e., Cohen syndrome; Kolehmainen et al, 2003), and Vps13C is strongly implicated in Parkinson's disease (Lesage et al, 2016; Table 2).