Parkinson disease 9 (PARK9 or Kufor-Rakeb syndrome, #606693) is a rare autosomal recessive juvenile-onset levodopa-responsive parkinsonism due to mutations in ATP13A2 (PARK9) encoding a lysosomal P-type ATP-ase (56). Here, ATP13A2 is linked to parkinsonism due to ATP13A2 deficiency.