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• W4385323003 abstract "Ex vivo gene correction with CRISPR-Cas9 and a recombinant adeno-associated virus serotype 6 (rAAV6) in autologous hematopoietic stem/progenitor cells (HSPCs) to treat sickle cell disease (SCD) has now entered early-phase clinical investigation. To facilitate the progress of CRISPR-Cas9/rAAV6 genome editing technology, we analyzed the molecular changes in key reagents and cellular responses during and after the genome editing procedure in human HSPCs. We demonstrated the high stability of rAAV6 to serve as the donor DNA template. We assessed the benefit of longer HSPC pre-stimulation in terms of increased numbers of edited cells. We observed that the p53 pathway was transiently activated, peaking at 6 h, and resolved over time. Notably, we revealed a strong correlation between p21 mRNA level and rAAV6 genome number in cells and beneficial effects of transient inhibition of p53 with siRNA on genome editing, cell proliferation, and cell survival. In terms of potential immunogenicity, we found that rAAV6 capsid protein was not detectable, while a trace amount of residual Cas9 protein was still detected at 48 h post-genome editing. We believe this information will provide important insights for future improvements of gene correction protocols in HSPCs. Ex vivo gene correction with CRISPR-Cas9 and a recombinant adeno-associated virus serotype 6 (rAAV6) in autologous hematopoietic stem/progenitor cells (HSPCs) to treat sickle cell disease (SCD) has now entered early-phase clinical investigation. To facilitate the progress of CRISPR-Cas9/rAAV6 genome editing technology, we analyzed the molecular changes in key reagents and cellular responses during and after the genome editing procedure in human HSPCs. We demonstrated the high stability of rAAV6 to serve as the donor DNA template. We assessed the benefit of longer HSPC pre-stimulation in terms of increased numbers of edited cells. We observed that the p53 pathway was transiently activated, peaking at 6 h, and resolved over time. Notably, we revealed a strong correlation between p21 mRNA level and rAAV6 genome number in cells and beneficial effects of transient inhibition of p53 with siRNA on genome editing, cell proliferation, and cell survival. In terms of potential immunogenicity, we found that rAAV6 capsid protein was not detectable, while a trace amount of residual Cas9 protein was still detected at 48 h post-genome editing. We believe this information will provide important insights for future improvements of gene correction protocols in HSPCs." @default.
• W4385323003 created "2023-07-28" @default.
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• W4385323003 date "2023-09-01" @default.
• W4385323003 modified "2023-09-28" @default.
• W4385323003 title "Molecular dynamics of genome editing with CRISPR-Cas9 and rAAV6 virus in human HSPCs to treat sickle cell disease" @default.
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• W4385323003 doi "https://doi.org/10.1016/j.omtm.2023.07.009" @default.
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