Trinucleotide Repeat ExpansionTrinucleotide RepeatsFriedreich AtaxiaDNA Repeat ExpansionSpinocerebellar DegenerationsMyotonic DystrophyFragile X SyndromeHuntington DiseaseFragile X Mental Retardation ProteinIron-Binding ProteinsTripletsAllelesPolymorphism, GeneticMutationRepetitive Sequences, Nucleic AcidPolymorphism, Single NucleotideBase SequenceSpinocerebellar AtaxiasMachado-Joseph DiseaseHeredodegenerative Disorders, Nervous SystemMolecular Sequence DataNerve Tissue ProteinsDNAMicrosatellite RepeatsGenomic InstabilityPolymerase Chain ReactionNucleic Acid ConformationAnticipation, GeneticFlap EndonucleasesFrontotemporal DementiaMinisatellite RepeatsPedigreeGene FrequencyTandem Repeat SequencesInverted Repeat SequencesAge of OnsetCerebellar AtaxiaIntranuclear Inclusion BodiesGenetic Diseases, InbornMuscular Dystrophy, OculopharyngealChromosome FragilityGenotypeRNA-Binding ProteinsGenetic Predisposition to DiseasePhenotypeHaplotypesSequence Analysis, DNAPregnancy, TripletAmyotrophic Lateral SclerosisNuclear ProteinsModels, GeneticNeurodegenerative DiseasesGenetic VariationGenetic MarkersDNA RepairProteinsDNA PrimersPeptidesCase-Control StudiesHeterozygoteExonsReceptors, AndrogenGenome, HumanMice, TransgenicAmino Acid SequenceTranscription, GeneticDNA Mutational AnalysisGenes, DominantDNA-Binding ProteinsRNA, MessengerChromosome MappingDNA ReplicationRepetitive Sequences, Amino AcidNucleic Acid HeteroduplexesMyoclonic Epilepsies, ProgressiveSaccharomyces cerevisiaeMutS Homolog 2 ProteinPromoter Regions, GeneticDinucleotide RepeatsGenetic LinkageDisease Models, AnimalGenetic Testing