Trinucleotide Repeat ExpansionTrinucleotide RepeatsFriedreich AtaxiaDNA Repeat ExpansionSpinocerebellar DegenerationsMyotonic DystrophyFragile X SyndromeHuntington DiseaseFragile X Mental Retardation ProteinPolymorphism, GeneticAllelesMicrosatellite RepeatsIron-Binding ProteinsPolymorphism, Single NucleotideGenotypeGene FrequencyMutationRepetitive Sequences, Nucleic AcidBase SequenceGenetic Predisposition to DiseasePolymerase Chain ReactionSpinocerebellar AtaxiasHaplotypesMolecular Sequence DataMachado-Joseph DiseaseGenetic MarkersDNAGenetic VariationHeredodegenerative Disorders, Nervous SystemDinucleotide RepeatsMinisatellite RepeatsCase-Control StudiesNerve Tissue ProteinsGenomic InstabilityPedigreeTandem Repeat SequencesSequence Analysis, DNAFrontotemporal DementiaFlap EndonucleasesAnticipation, GeneticAge of OnsetPhenotypeNucleic Acid ConformationInverted Repeat SequencesDNA, SatelliteDNA PrimersHeterozygoteModels, GeneticCerebellar AtaxiaGenetic Diseases, InbornIntranuclear Inclusion BodiesChromosome FragilityChromosome MappingMuscular Dystrophy, OculopharyngealGenetics, PopulationRNA-Binding ProteinsLinkage DisequilibriumGenetic LinkageAsian Continental Ancestry GroupGenetic Association StudiesDNA RepairGenome, HumanAmyotrophic Lateral SclerosisExonsNuclear ProteinsNeurodegenerative DiseasesProteinsDNA Mutational AnalysisPeptidesReceptors, AndrogenPromoter Regions, GeneticEvolution, MolecularPolymorphism, Restriction Fragment LengthGenes, DominantDNA, PlantDNA-Binding ProteinsPeptidyl-Dipeptidase AGenetic LociMice, TransgenicPhylogenyChinaMutS Homolog 2 ProteinGenetic TestingTranscription, GeneticExpressed Sequence TagsAmino Acid SequenceHomozygoteDNA ReplicationRecombination, GeneticRisk FactorsRNA, MessengerSaccharomyces cerevisiaeMyoclonic Epilepsies, ProgressiveChromosomes, Human, XIntronsRepetitive Sequences, Amino AcidSpecies SpecificityNucleic Acid HeteroduplexesMethylenetetrahydrofolate Reductase (NADPH2)Sequence Deletion