Intellectual DisabilityMental Retardation, X-LinkedFragile X Mental Retardation ProteinFetal Growth RetardationFragile X SyndromeAbnormalities, MultipleGrowth DisordersSyndromeMicrocephalyPedigreeFaciesPsychomotor DisordersSex Chromosome AberrationsMolecular Sequence DataChromosomes, Human, XX ChromosomeBase SequencePregnancyBirefringencePhenotypeMutationConsanguinityDevelopmental DisabilitiesInfant, NewbornChromosome DeletionMuscle HypotoniaKaryotypingAtaxiaChromosome DisordersGenes, RecessiveIn Situ Hybridization, FluorescenceEducation of Intellectually DisabledChromosome AberrationsTrisomyRNA-Binding ProteinsChromosome BandingGrowthDNA-Binding ProteinsGenetic LinkageCraniofacial AbnormalitiesSpasms, InfantileMethyl-CpG-Binding Protein 2FaceFailure to ThriveRett SyndromeChromosome MappingDwarfismMice, KnockoutFetal DeathAutistic DisorderNuclear ProteinsPromoter Regions, GeneticTranscription FactorsBrainHypertelorismColobomaRing ChromosomesDNA Mutational AnalysisDown SyndromeEpilepsyAmino Acid SequenceHeterozygoteHand Deformities, CongenitalGestational AgeRNA, MessengerFacial BonesNerve Tissue ProteinsDNAEmbryonic and Fetal DevelopmentMonosomyNervous System MalformationsAbnormalities, Drug-Inducedalpha-ThalassemiaTranslocation, GeneticGene DeletionIntelligence TestsBirth WeightHemoglobin HHomozygoteRubinstein-Taybi SyndromePlacentaMicroscopy, PolarizationMice, Inbred C57BLDisease Models, AnimalBody HeightTranscription, GeneticSeizuresBone Diseases, DevelopmentalChromosomes, Human, 6-12 and XFetal WeightProtein BindingMosaicismHeterozygote DetectionBinding SitesChromosomes, Human, Pair 15Oculocerebrorenal SyndromeDe Lange SyndromeSequence DeletionRepressor ProteinsMutation, Missense