Polyphosphatidylinositol phosphatase SYNJ1 (Synaptojanin-1) [Includes: SAC-like phosphoinositide phosphatase SYNJ1 (Phosphatidylinositol-3,5-bisphosphate 3-phosphatase SYNJ1) (EC 3.1.3.95) (Phosphatidylinositol-4-phosphatase SYNJ1) (EC 3.1.3.-); Phosphoinositide 5-phosphatase SYNJ1 (EC 3.1.3.36) (Inositol polyphosphate-5-phosphatase G) (Synaptic inositol 1,4,5-trisphosphate 5-phosphatase 1)]