Other than genetic causes of such syndromes, In addition there are scenarios where the Snrpn/Ube3A cluster is intact but its genes are epigenetically misregulated. That is By way of example the situation if each homologs of chromosome fifteen originate through the exact parent, a condition identified as uniparental disomy (UPD). https://connernrrsp.nizarblog.com/29388872/the-best-side-of-pattern-imprint