Intellectual DisabilityMental Retardation, X-LinkedFragile X Mental Retardation ProteinFragile X SyndromeAbnormalities, MultipleSyndromeMicrocephalyPedigreeSex Chromosome AberrationsFetal Growth RetardationChromosomes, Human, XX ChromosomeFaciesGrowth DisordersConsanguinityAtaxiaDevelopmental DisabilitiesChromosome DeletionPhenotypeMutationEducation of Intellectually DisabledMethyl-CpG-Binding Protein 2KaryotypingGenetic LinkageIn Situ Hybridization, FluorescenceRett SyndromeGenes, RecessiveRNA-Binding ProteinsSpasms, InfantileMuscle HypotoniaChromosome DisordersAutistic DisorderChromosome BandingMolecular Sequence DataChromosome AberrationsCraniofacial AbnormalitiesDown SyndromeChromosome MappingEpilepsyHypertelorismFaceBase Sequencealpha-ThalassemiaInfant, NewbornNerve Tissue ProteinsPsychomotor DisordersTrisomyIntelligence TestsBrainRing ChromosomesDNA Mutational AnalysisHand Deformities, CongenitalHeterozygoteColobomaTrinucleotide Repeat ExpansionHemoglobin HNervous System MalformationsPregnancyOculocerebrorenal SyndromeTranslocation, GeneticHeterozygote DetectionTuberous SclerosisFacial BonesInterleukin-1 Receptor Accessory ProteinDosage Compensation, GeneticMonosomySeizuresRubinstein-Taybi SyndromeAngelman SyndromeChromosome BreakageIntelligenceChromosomes, Human, Pair 15Genetic Diseases, X-LinkedGenetic TestingNeuronsMice, KnockoutGene DuplicationPhenylketonuriasCerebellar AtaxiaGene DeletionCoffin-Lowry SyndromeLanguage Development DisordersCodon, NonsenseChromosomes, Human, Pair 21Mutation, MissenseAmino Acid SequenceNuclear ProteinsChromosome FragilityReceptors, Metabotropic GlutamateFailure to ThriveGenetic MarkersDendritic SpinesWAGR SyndromeLearning DisordersSex Chromosome DisordersClassical Lissencephalies and Subcortical Band HeterotopiasDendritesSjogren-Larsson SyndromeWolf-Hirschhorn SyndromeAdaptor Protein Complex sigma Subunits