Angelman SyndromePrader-Willi SyndromeChromosomes, Human, Pair 15snRNP Core ProteinsGenomic ImprintingUbiquitin-Protein LigasesLaughterUniparental DisomyRibonucleoproteins, Small NuclearTetrasomyBeckwith-Wiedemann SyndromeIntellectual DisabilityChromosome DeletionMicrocephalyChromosome InversionDNA MethylationAtaxiaIn Situ Hybridization, FluorescenceChromosome BreakageChromosome MappingChromosome BandingGenetic CounselingAutoantigensFathersPedigreeGenetic MarkersPhenotype