Trinucleotide Repeat ExpansionTrinucleotide RepeatsFriedreich AtaxiaDNA Repeat ExpansionSpinocerebellar DegenerationsMyotonic DystrophyFragile X SyndromeHuntington DiseaseFragile X Mental Retardation ProteinPolymorphism, GeneticAllelesIron-Binding ProteinsPolymorphism, Single NucleotideMutationGenotypeGene FrequencyGenetic Predisposition to DiseaseRepetitive Sequences, Nucleic AcidBase SequenceGenetic Diseases, InbornMachado-Joseph DiseaseSpinocerebellar AtaxiasPolymerase Chain ReactionHaplotypesMolecular Sequence DataPedigreeNerve Tissue ProteinsMicrosatellite RepeatsHeredodegenerative Disorders, Nervous SystemDNACase-Control StudiesMinisatellite RepeatsGenomic InstabilityPhenotypeAge of OnsetGenetic MarkersFrontotemporal DementiaFlap EndonucleasesTandem Repeat SequencesAnticipation, GeneticNucleic Acid ConformationInverted Repeat SequencesSequence Analysis, DNACerebellar AtaxiaGenetic LinkageGenetic Association StudiesModels, GeneticIntranuclear Inclusion BodiesChromosome MappingChromosome FragilityGenetic VariationMuscular Dystrophy, OculopharyngealRNA-Binding ProteinsHeterozygoteAsian Continental Ancestry GroupLinkage DisequilibriumGenome, HumanExonsDNA PrimersNuclear ProteinsProteinsGenes, DominantDNA Mutational AnalysisAmyotrophic Lateral SclerosisDNA RepairDiseaseNeurodegenerative DiseasesPeptidesReceptors, AndrogenGenetic TestingPolymorphism, Restriction Fragment LengthPromoter Regions, GeneticAmino Acid SequenceHomozygoteMice, TransgenicDNA-Binding ProteinsPeptidyl-Dipeptidase ADinucleotide RepeatsTranscription, GeneticRNA, MessengerRepetitive Sequences, Amino AcidChromosomes, Human, XRisk FactorsDisease Models, AnimalDNA ReplicationSaccharomyces cerevisiaeMyoclonic Epilepsies, ProgressiveChinaMutS Homolog 2 ProteinDNA, SatelliteIntronsNucleic Acid HeteroduplexesMethylenetetrahydrofolate Reductase (NADPH2)Recombination, GeneticSequence DeletionPolymorphism, Single-Stranded ConformationalX ChromosomePoint MutationBrainCell Line