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Leclerc, Delphine; Goujon, Louise; Jaillard, Sylvie; Nouyou, Bénédicte; Cluzeau, Laurence; Damaj, Léna; Dubourg, Christèle; Etcheverry, Amandine; Levade, Thierry; Froissart, Roseline; Dréano, Stéphane; Guillory, Xavier; Eriksson, Leif A; Launay, Erika; Mouriaux, Frédéric; Belaud-Rotureau, Marc-Antoine; Odent, Sylvie; Gilot, David
CRISPR journal, 02/2023, Volume: 6, Issue: 1Journal Article
Ganglioside-monosialic acid (GM1) gangliosidosis, a rare autosomal recessive disorder, is frequently caused by deleterious single nucleotide variants (SNVs) in gene. These variants result in reduced β-galactosidase (β-gal) activity, leading to neurodegeneration associated with premature death. Currently, no effective therapy for GM1 gangliosidosis is available. Three ongoing clinical trials aim to deliver a functional copy of the gene to stop disease progression. In this study, we show that 41% of pathogenic SNVs can be replaced by adenine base editors (ABEs). Our results demonstrate that ABE efficiently corrects the pathogenic allele in patient-derived fibroblasts, restoring therapeutic levels of β-gal activity. Off-target DNA analysis did not detect off-target editing activity in treated patient's cells, except a bystander edit without consequences on β-gal activity based on 3D structure bioinformatics predictions. Altogether, our results suggest that gene editing might be an alternative strategy to cure GM1 gangliosidosis.
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