Trinucleotide Repeat ExpansionTrinucleotide RepeatsFriedreich AtaxiaDNA Repeat ExpansionSpinocerebellar DegenerationsMyotonic DystrophyFragile X SyndromeHuntington DiseaseFragile X Mental Retardation ProteinIron-Binding ProteinsAllelesPolymorphism, GeneticMutationRepetitive Sequences, Nucleic AcidPolymorphism, Single NucleotideBase SequenceSpinocerebellar AtaxiasMachado-Joseph DiseaseMolecular Sequence DataHeredodegenerative Disorders, Nervous SystemNerve Tissue ProteinsDNAMicrosatellite RepeatsGenomic InstabilityPolymerase Chain ReactionFrontotemporal DementiaFlap EndonucleasesPedigreeMinisatellite RepeatsAnticipation, GeneticGene FrequencyTandem Repeat SequencesNucleic Acid ConformationInverted Repeat SequencesAge of OnsetCerebellar AtaxiaIntranuclear Inclusion BodiesPhenotypeChromosome FragilityGenotypeGenetic Diseases, InbornGenetic Predisposition to DiseaseMuscular Dystrophy, OculopharyngealRNA-Binding ProteinsSequence Analysis, DNAHaplotypesNuclear ProteinsAmyotrophic Lateral SclerosisGenetic VariationNeurodegenerative DiseasesModels, GeneticDNA PrimersGenetic MarkersProteinsDNA RepairPeptidesAmino Acid SequenceHeterozygoteExonsCase-Control StudiesReceptors, AndrogenMice, TransgenicGenome, HumanTranscription, GeneticDNA Mutational AnalysisDNA-Binding ProteinsRNA, MessengerGenes, DominantChromosome MappingPromoter Regions, GeneticDNA ReplicationMyoclonic Epilepsies, ProgressiveSaccharomyces cerevisiaeRepetitive Sequences, Amino AcidGenetic LinkageMutS Homolog 2 ProteinNucleic Acid HeteroduplexesDisease Models, AnimalCell LineDinucleotide RepeatsGenetic TestingChromosomes, Human, XRecombination, Genetic