INPP5F and Parkinson disease: It is noteworthy that mutations in the IDR‐containing lipid phosphatases such as the PI 4−/5‐phosphatase Synaptojanin 1 (Krebs et al, 2013; Quadri et al, 2013) and the PI 4‐phosphatase Sac2/INPP5F (Cao et al, 2020) are also causally linked to Parkinsonism, implicating dysfunctional lipid metabolism in the disease.