Trinucleotide Repeat ExpansionTrinucleotide RepeatsHuntington DiseaseFriedreich AtaxiaDNA Repeat ExpansionSpinocerebellar DegenerationsMyotonic DystrophyFragile X SyndromeFragile X Mental Retardation ProteinMicrosatellite RepeatsIron-Binding ProteinsAllelesMutationRepetitive Sequences, Nucleic AcidNerve Tissue ProteinsBase SequenceSpinocerebellar AtaxiasMachado-Joseph DiseaseMolecular Sequence DataHeredodegenerative Disorders, Nervous SystemGenetic MarkersPedigreeDNAGenomic InstabilityDinucleotide RepeatsAge of OnsetPolymorphism, GeneticMinisatellite RepeatsFrontotemporal DementiaFlap EndonucleasesAnticipation, GeneticPolymerase Chain ReactionTandem Repeat SequencesNucleic Acid ConformationNuclear ProteinsInverted Repeat SequencesGenetic VariationDNA, SatelliteGenetic Diseases, InbornCerebellar AtaxiaNeurodegenerative DiseasesGenotypeIntranuclear Inclusion BodiesSequence Analysis, DNAChromosome FragilityMuscular Dystrophy, OculopharyngealPhenotypeModels, GeneticChromosome MappingRNA-Binding ProteinsPeptidesHeterozygoteMice, TransgenicGene FrequencyHaplotypesDNA PrimersGenetic LinkageAmyotrophic Lateral SclerosisProteinsGenetics, PopulationDisease Models, AnimalDNA RepairGenome, HumanGenetic TestingChromosomes, Human, Pair 4Receptors, AndrogenExonsBrainMutS Homolog 2 ProteinGenes, DominantEvolution, MolecularDNA, PlantDNA ReplicationTranscription, GeneticAmino Acid SequenceMyoclonic Epilepsies, ProgressiveExpressed Sequence TagsSaccharomyces cerevisiaeDNA-Binding ProteinsRecombination, GeneticRNA, MessengerChromosomes, Human, XRepetitive Sequences, Amino AcidGene Knock-In TechniquesNucleic Acid HeteroduplexesGenetic LociCell LineDNA Mutational Analysis