Angelman SyndromePrader-Willi SyndromeChromosomes, Human, Pair 15snRNP Core ProteinsGenomic ImprintingSyndromeUbiquitin-Protein LigasesUniparental DisomyLaughterRibonucleoproteins, Small NuclearBeckwith-Wiedemann SyndromeChromosome DeletionMicrocephalyIntellectual DisabilityChromosome InversionDNA MethylationIn Situ Hybridization, FluorescencePedigreeChromosome BreakageChromosome MappingAtaxiaPhenotypeAbnormalities, MultipleGenetic CounselingAutoantigensChromosome BandingMethyl-CpG-Binding Protein 2FathersGenetic MarkersRett SyndromeLigases