Trinucleotide Repeat ExpansionTrinucleotide RepeatsFriedreich AtaxiaDNA Repeat ExpansionSpinocerebellar DegenerationsMyotonic DystrophyFragile X SyndromePolymorphism, GeneticHuntington DiseaseFragile X Mental Retardation ProteinAllelesDinucleotide RepeatsTandem Repeat SequencesIron-Binding ProteinsRepetitive Sequences, Nucleic AcidMinisatellite RepeatsMicrosatellite RepeatsBase SequenceMutationPolymorphism, Single NucleotideGenotypeGene FrequencyMolecular Sequence DataPolymerase Chain ReactionReceptors, AndrogenGenetic Predisposition to DiseaseSpinocerebellar AtaxiasMachado-Joseph DiseasePedigreeDNAHaplotypesHeredodegenerative Disorders, Nervous SystemCase-Control StudiesNerve Tissue ProteinsGenomic InstabilitySequence Analysis, DNAInverted Repeat SequencesGenetic MarkersGenetic VariationFrontotemporal DementiaFlap EndonucleasesAnticipation, GeneticPhenotypeNucleic Acid ConformationGenetic LinkageAge of OnsetReceptors, Dopamine D4ExonsCerebellar AtaxiaChromosome MappingIntranuclear Inclusion BodiesIntronsChromosome FragilityHeterozygoteGenetic Diseases, InbornMuscular Dystrophy, OculopharyngealDNA PrimersRNA-Binding ProteinsPromoter Regions, GeneticDNA, SatelliteNuclear ProteinsAmyotrophic Lateral SclerosisLinkage DisequilibriumModels, GeneticRepetitive Sequences, Amino AcidNeurodegenerative DiseasesProteinsDNA RepairPeptidesAsian Continental Ancestry GroupAmino Acid SequenceAromataseGenome, HumanMice, TransgenicTranscription, Genetic3-Oxo-5-alpha-Steroid 4-DehydrogenaseDNA-Binding ProteinsDNA Mutational AnalysisPolymorphism, Restriction Fragment LengthAnkyrin RepeatGenes, DominantDNA ReplicationEuropean Continental Ancestry GroupRNA, MessengerMyoclonic Epilepsies, ProgressiveSaccharomyces cerevisiaeMutS Homolog 2 ProteinNucleic Acid HeteroduplexesInterleukin 1 Receptor Antagonist ProteinChinaRecombination, GeneticCell LineDisease Models, AnimalGenetic TestingChromosomes, Human, XSequence DeletionCohort Studies