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Proc Natl Acad Sci U S A
2002 Jul 09;9914:9456-61. doi: 10.1073/pnas.142302299.
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Chimeric snRNA molecules carrying antisense sequences against the splice junctions of exon 51 of the dystrophin pre-mRNA induce exon skipping and restoration of a dystrophin synthesis in Delta 48-50 DMD cells.
De Angelis FG
,
Sthandier O
,
Berarducci B
,
Toso S
,
Galluzzi G
,
Ricci E
,
Cossu G
,
Bozzoni I
.
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Deletions and point mutations in the dystrophin gene cause either the severe progressive myopathy Duchenne muscular dystrophy (DMD) or the milder Becker muscular dystrophy, depending on whether the translational reading frame is lost or maintained. Because internal in-frame deletions in the protein produce only mild myopathic symptoms, it should be possible, by preventing the inclusion of specific mutated exon(s) in the mature dystrophin mRNA, to restore a partially corrected phenotype. Such control has been previously accomplished by the use of synthetic oligonucleotides; nevertheless, a significant drawback to this approach is caused by the fact that oligonucleotides would require periodic administrations. To circumvent this problem, we have produced several constructs able to express in vivo, in a stable fashion, large amounts of chimeric RNAs containing antisense sequences. In this paper we show that antisense molecules against exon 51 splice junctions are able to direct skipping of this exon in the human DMD deletion 48-50 and to rescue dystrophin synthesis. We also show that the highest skipping activity was found when antisense constructs against the 5' and 3' splice sites are coexpressed in the same cell.
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