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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
REVIEW
Improving the Quality of Adeno-Associated Viral Vector Preparations: The Challenge of Product-Related Impurities.
Human Gene Therapy Methods 2017 June
Adeno-associated viral (AAV) vectors have emerged as one of the most popular gene transfer systems in both research and clinical gene therapy. As AAV vectors are derived from a stealth, nonpathogenic virus and lack active integrase activity, these vectors are frequently applied for in vivo gene therapy of liver, muscle, and other postmitotic tissues. Although long-term transgene expression from AAV vector episomes is reported from these tissues, the episomal nature of AAV-once regarded as disadvantage-has become an attractive feature for gene-editing approaches targeting proliferating cells. In response to the high demand, AAV vector production is receiving special attention. Besides particle yields and biological activity, the most important concern is improving vector purity. The most difficult task in this regard is removal of defective particles, that is, capsids that are either empty or contain DNA other than the full-length vector genomes. Herein, we characterize and discuss these so-called product-related impurities, methods for their detection, as well as strategies to avoid or reduce their formation.
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