Age of OnsetParkinson DiseaseHuntington DiseaseTrinucleotide RepeatsGenotypeGenetic Predisposition to DiseaseAge FactorsPedigreealpha-SynucleinPolymorphism, Single NucleotideGene FrequencyAntiparkinson AgentsRisk FactorsParkinsonian DisordersParkinson Disease, SecondaryLevodopaGlucosylceramidaseSubstantia NigraLewy BodiesDeep Brain StimulationMultiple System AtrophyDopamine1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridineDopaminergic NeuronsOxidopamineSubthalamic NucleusLewy Body DiseaseNeurodegenerative DiseasesMPTP PoisoningSupranuclear Palsy, ProgressiveGait Disorders, NeurologicPostural BalanceBrainPutamenDance TherapyNeuronsEssential TremorUbiquitin-Protein LigasesPedunculopontine Tegmental NucleusREM Sleep Behavior DisorderOncogene ProteinsGaitGaucher DiseaseTyrosine 3-MonooxygenaseMutationCarbidopaPergolideNerve DegenerationTime FactorsDementiaSeverity of Illness IndexHypokinesiaCorpus Striatumbeta-SynucleinMovement DisordersDisease Models, AnimalGlobus PallidusMesencephalonCase-Control StudiesNeuroprotective AgentsManebMitochondriaNeuropsychological TestsDyskinesiasAlzheimer DiseaseOlfaction Disorders1-Methyl-4-phenylpyridiniumSynucleinsTropanesDopamine Plasma Membrane Transport ProteinsDopamine AgentsDopamine AgonistsPositron-Emission TomographyApathyGenetic TestingCognition DisordersBenzothiazolestau ProteinsSleep Arousal DisordersAutophagyDisease ProgressionAnalysis of VarianceNeurologic ExaminationAdrenergic AgentsBasal GangliaPrimary DysautonomiasRotenonePostmortem ChangesNerve Tissue ProteinsCohort StudiesGenome-Wide Association StudyDyskinesia, Drug-InducedManganese PoisoningDNA Mutational AnalysisMagnetic Resonance ImagingOxidative StressPure Autonomic FailureLabor OnsetParaquatPenetrance