Abstract
Genome editing through adeno-associated viral (AAV) vectors is a promising gene therapy strategy for various diseases, especially genetic disorders. However, homologous recombination (HR) efficiency is extremely low in adult animal models. We assumed that increasing AAV transduction efficiency could increase genome editing activity, especially HR efficiency, for in vivo gene therapy. Firstly, a mouse phenylketonuria (PKU) model carrying a pathogenic R408W mutation in phenylalanine hydroxylase (Pah) was generated. Through co-delivery of the general AAV receptor (AAVR), we found that AAVR could dramatically increase AAV transduction efficiency in vitro and in vivo. Furthermore, co-delivery of SaCas9/sgRNA/donor templates with AAVR via AAV8 vectors increased indel rate over 2-fold and HR rate over 15-fold for the correction of the single mutation in PahR408W mice. Moreover, AAVR co-injection successfully increased the site-specific insertion rate of a 1.4 kb Pah cDNA by 11-fold, bringing the HR rate up to 7.3% without detectable global off-target effects. Insertion of Pah cDNA significantly decreased the Phe level and ameliorated PKU symptoms. This study demonstrates a novel strategy to dramatically increase AAV transduction which substantially enhanced in vivo genome editing efficiency in adult animal models, showing clinical potential for both conventional and genome editing-based gene therapy.
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Acknowledgements
We thank Meizhen Liu from East China Normal University for microinjection and generation of the PKU mouse model, the ECNU Public Platform for innovation(011) for its support, and Dr Stefan Siwko for proof reading of this manuscript. This work was partially supported by grants from the National Key R&D Program of China (2019YFA0110802), the National Natural Science Foundation of China (81670470 and 81873685), grants from the Shanghai Municipal Commission for Science and Technology (18411953500 and 20140900201), a grant from the Innovation Program of Shanghai Municipal Education Commission (2019-01-07-00-05-E00054), and the Fundamental Research Funds for the Central Universities.
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The author(s) declare that they have no conflict of interest. All animal work conformed to the regulations of the animal ethics committee and was approved by the East China Normal University Center for Animal Research.
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Enhanced genome editing to ameliorate a genetic metabolic liver disease through co-delivery of adeno-associated virus receptor
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Yin, S., Ma, L., Shao, T. et al. Enhanced genome editing to ameliorate a genetic metabolic liver disease through co-delivery of adeno-associated virus receptor. Sci. China Life Sci. 65, 718–730 (2022). https://doi.org/10.1007/s11427-020-1744-6
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DOI: https://doi.org/10.1007/s11427-020-1744-6