Parkinson Disease 20, Early-Onset, also known as early-onset parkinson disease 20, is related to developmental and epileptic encephalopathy 53 and parkinsonism, and has symptoms including muscle rigidity, tremor and bradykinesia. An important gene associated with Parkinson Disease 20, Early-Onset is SYNJ1 (Synaptojanin 1), and among its related pathways/superpathways are Glycerophospholipid biosynthesis and PI Metabolism. Affiliated tissues include eye and brain, and related phenotypes are dysarthria and dysphagia