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2015 ; 4
(9
): e250
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Intravitreal Injection of Splice-switching Oligonucleotides to Manipulate
Splicing in Retinal Cells
#MMPMID26325627
Gérard X
; Perrault I
; Munnich A
; Kaplan J
; Rozet JM
Mol Ther Nucleic Acids
2015[Sep]; 4
(9
): e250
PMID26325627
show ga
Leber congenital amaurosis is a severe hereditary retinal dystrophy responsible
for neonatal blindness. The most common disease-causing mutation (c.2991+1655A>G;
10-15%) creates a strong splice donor site that leads to insertion of a cryptic
exon encoding a premature stop codon. Recently, we reported that splice-switching
oligonucleotides (SSO) allow skipping of the mutant cryptic exon and the
restoration of ciliation in fibroblasts of affected patients, supporting the
feasibility of a SSO-mediated exon skipping strategy to correct the aberrant
splicing. Here, we present data in the wild-type mouse, which demonstrate that
intravitreal administration of 2'-OMePS-SSO allows selective alteration of Cep290
splicing in retinal cells, including photoreceptors as shown by successful
alteration of Abca4 splicing using the same approach. We show that both SSOs and
Cep290 skipped mRNA were detectable for at least 1 month and that intravitreal
administration of oligonucleotides did not provoke any serious adverse event.
These data suggest that intravitreal injections of SSO should be considered to
bypass protein truncation resulting from the c.2991+1655A>G mutation as well as
other truncating mutations in genes which like CEP290 or ABCA4 have a mRNA size
that exceed cargo capacities of US Food and Drug Administration (FDA)-approved
adeno-associated virus (AAV)-vectors, thus hampering gene augmentation therapy.