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• W4309371318 abstract "Abstract Mutant RHO is the most frequent genetic cause of autosomal dominant retinitis pigmentosa. Here, we developed an allele-specific gene editing therapeutic drug to selectively target the human T17M RHO mutant allele while leaving the wild-type RHO allele intact for the first time. We identified a Staphylococcus aureus Cas9 (SaCas9) guide RNA that was highly active and specific to the human T17M RHO allele. In vitro experiments using HEK293T cells and patient-specific induced pluripotent stem cells (iPSCs) demonstrated active nuclease activity and high specificity. Subretinal delivery of a single adeno-associated virus serotype 2/8 packaging SaCas9 and sgRNA to the retinas of the RHO humanized mice showed that this therapeutic drug targeted the mutant allele selectively, thereby downregulating the mutant RHO mRNA expression. Administration of this therapeutic drug resulted in a long-term (up to 11 months after treatment) improvement of retinal function and preservation of photoreceptors in the mutant humanized heterozygous mice. Our study demonstrated a dose-dependent therapeutic effect in vivo. Unwanted off-target effects were not observed at the whole-genome sequencing level. Our study provides strong support for the further development of this effective therapeutic drug to treat RHO -T17M associated autosomal dominant retinitis pigmentosa (adRP), also offers a generalizable framework for developing gene editing medicine. Furthermore, our success in retoring the vision loss in the suffering RHO humanized mice verifies the feasibility of allele-specific CRISPR/Cas9-based medicines for other autosomal dominant inherited retinal dystrophies." @default.
• W4309371318 created "2022-11-26" @default.
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• W4309371318 date "2022-11-16" @default.
• W4309371318 modified "2023-09-24" @default.
• W4309371318 title "Allele-specific gene editing approach for vision loss restoration in<i>RHO</i>-associated Retinitis Pigmentosa" @default.
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• W4309371318 doi "https://doi.org/10.1101/2022.11.16.516784" @default.
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