Spinocerebellar AtaxiasSpinocerebellar DegenerationsMachado-Joseph DiseaseCerebellar AtaxiaAtaxiaTrinucleotide Repeat ExpansionTrinucleotide RepeatsNerve Tissue ProteinsSpinocerebellar TractsPurkinje CellsCerebellumFriedreich AtaxiaIntranuclear Inclusion BodiesDNA Repeat ExpansionNuclear ProteinsShaw Potassium ChannelsRegression (Psychology)Inclusion BodiesAge of OnsetGait AtaxiaPeptidesHeredodegenerative Disorders, Nervous SystemPedigreeNerve DegenerationAnticipation, GeneticMutationGenes, DominantCalcium Channels, Q-TypeFounder EffectRepressor ProteinsAtaxia TelangiectasiaChromosomes, Human, Pair 19Neurodegenerative DiseasesCalcium Channels, P-TypeFamily HealthMice, TransgenicAtaxia Telangiectasia Mutated ProteinsDisease Models, AnimalPhenotypeAtrophyMagnetic Resonance ImagingBrainAllelesRepetitive Sequences, Nucleic AcidSpectrinCalcium ChannelsMutation, MissenseAnimals, Genetically ModifiedNeuronsGenetic LinkageHuntington DiseaseMolecular Sequence DataKv1.1 Potassium ChannelHaplotypesMyoclonic Cerebellar DyssynergiaHEK293 CellsCOS CellsProtein BindingUbiquitinMotor ActivityChromosome MappingChromosomes, Human, Pair 6Cell NucleusChromosomes, Human, Pair 20GenotypeMultiple System AtrophyBase SequenceMicrosatellite RepeatsAmino Acid SequenceIron-Binding ProteinsCerebellar DiseasesCell LineGene FrequencyDNA Probes, HLAMice, Inbred C57BL