Description : Parkinson disease-20 is an autosomal recessive neurodegenerative disorder characterized
by young adult-onset of parkinsonism. Additional features may include seizures, cognitive
decline, abnormal eye movements, and dystonia (summary by Krebs et al., 2013 and Quadri
et al., 2013). For a phenotypic description and a discussion of genetic heterogeneity
of Parkinson disease, see PD (168600).;
Inheritance : Autosomal recessive;
Molecular basis : Caused by mutation in the synaptojanin-1 gene (SYNJ1, 604297.0001);