The invention provides compositions useful to knock down overexpression of UBE3A and treat conditions associated with Dup15q syndrome. The compositions include
antisense oligonucleotides, preferably short oligonucleotides that are complementary to, and hybridize to, UBE3A transcripts
in vivo. The ASOs prevent or inhibit successful translation of UBE3A mRNA into
protein. Specifically, preferred embodiments include anti-UBE3A gapmers—oligos that include a central
DNA portion flanked by
RNA wings. When the gapmer hybridizes to UBE3A pre-mRNA or mRNA, the duplex
hybrid recruits RNaseH, which cleaves, or digests, the UBE3A pre-mRNA or mRNA, preventing expression of the UBE3A
protein. Because the ASOs prevent expression of the UBE3A
protein, treatment with a composition including ASOs of the disclosure may be effective to knock down overexpression of UBE3A.