Trinucleotide Repeat ExpansionTrinucleotide RepeatsFriedreich AtaxiaDNA Repeat ExpansionPolymorphism, GeneticSpinocerebellar DegenerationsMyotonic DystrophyFragile X SyndromeAllelesHuntington DiseaseFragile X Mental Retardation ProteinElectrophoresis, Starch GelIron-Binding ProteinsGene FrequencyGenetic VariationPhenotypeMutationRepetitive Sequences, Nucleic AcidPolymorphism, Single NucleotideSelection, GeneticSpinocerebellar AtaxiasBase SequenceMachado-Joseph DiseaseHeredodegenerative Disorders, Nervous SystemMolecular Sequence DataNerve Tissue ProteinsMicrosatellite RepeatsDNAGenomic InstabilityPolymerase Chain ReactionFrontotemporal DementiaFlap EndonucleasesMinisatellite RepeatsAnticipation, GeneticPedigreeTandem Repeat SequencesNucleic Acid ConformationInverted Repeat SequencesAge of OnsetCerebellar AtaxiaIntranuclear Inclusion BodiesChromosome FragilityMuscular Dystrophy, OculopharyngealGenotypeGenetic Diseases, InbornGenetic Predisposition to DiseaseRNA-Binding ProteinsHaplotypesSequence Analysis, DNAAmyotrophic Lateral SclerosisNuclear ProteinsNeurodegenerative DiseasesModels, GeneticGenetic MarkersDNA RepairProteinsCase-Control StudiesDNA PrimersPeptidesHeterozygoteExonsReceptors, AndrogenGenome, HumanMice, TransgenicGenes, DominantDNA Mutational AnalysisTranscription, GeneticDNA-Binding ProteinsChromosome MappingAmino Acid SequenceDNA ReplicationMyoclonic Epilepsies, ProgressiveRNA, MessengerMutS Homolog 2 ProteinRepetitive Sequences, Amino AcidNucleic Acid HeteroduplexesSaccharomyces cerevisiaePromoter Regions, GeneticDinucleotide RepeatsGenetic LinkageDisease Models, AnimalGenetic TestingChromosomes, Human, X