Angelman SyndromePrader-Willi SyndromeChromosomes, Human, Pair 15snRNP Core ProteinsGenomic ImprintingSyndromeUbiquitin-Protein LigasesUniparental DisomyLaughterRibonucleoproteins, Small NuclearBeckwith-Wiedemann SyndromeChromosome DeletionIntellectual DisabilityMicrocephalyChromosome InversionDNA MethylationIn Situ Hybridization, FluorescenceChromosome BreakagePedigreeAtaxiaChromosome MappingPhenotypeAbnormalities, MultipleGenetic CounselingChromosome BandingAutoantigensMethyl-CpG-Binding Protein 2FathersGenetic Markers