期刊
MOLECULAR THERAPY-METHODS & CLINICAL DEVELOPMENT
卷 17, 期 -, 页码 545-555出版社
CELL PRESS
DOI: 10.1016/j.omtm.2020.03.007
关键词
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资金
- Natural Science Foundation of Shanghai [17ZR1448400]
- US Public Health Service grants from the National Institutes of Health [R01 HL-097088, R41 AI-122735, R21 EB-015684]
- Children's Miracle Network
- Kitzman Foundation
- NIH [R01 GM082946]
- Shanghai Sailing Program [17YF1401300]
- Shanghai Eastern Scholarship [TP2016004]
Recombinant adeno-associated virus (rAAV) vectors selected from capsid libraries present enormous advantages in high selectivity of tissue tropism and their potential use in human gene therapy applications. For example, rAAV-LK03, was used in a gene therapy trial for hemophilia A (ClinicalTrials. gov: NCT03003533). However, high doses in patients resulted in severe adverse events and subsequent loss of factor VIII (FVIII) expression. Thus, additional strategies are needed to enhance the transduction efficiency of capsid library-derived rAAV vectors such that improved clinical efficacy can be achieved at low vector doses. In this study, we characterized two commonly used library-derived rAAV vectors, rAAV-DJ and rAAV-LK03. It was concluded that rAAV-DJ shared similar transport pathways (e.g., cell surface binding, endocytosis-dependent internalization, and cytoplasmic trafficking) with rAAV serotype 2, while rAAV-LK03 and rAAV serotype 3 shared similar transport pathways. We then performed site-directed mutagenesis of surface-exposed tyrosine (Y), serine (S), aspartic acid (D), and tryptophan (W) residues on rAAV-DJ and rAAV-LK03 capsids. Our results demonstrated that rAAV-DJ-S269T and rAAV-LK03-Y705+731F variants had significantly enhanced transduction efficiency compared to wild-type counterparts. Our studies suggest that the strategy of site-directed mutagenesis should be applicable to other non-natural AAV variants for their optimal use in human gene therapy.
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