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Optimized Transgene Delivery Using Third‐Generation Lentiviruses
Author(s) -
Gill Katherine P.,
Denham Mark
Publication year - 2020
Publication title -
current protocols in molecular biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.533
H-Index - 42
eISSN - 1934-3647
pISSN - 1934-3639
DOI - 10.1002/cpmb.125
Subject(s) - lentivirus , transgene , biology , titer , microbiology and biotechnology , computational biology , chemistry , genetics , gene , virus , viral disease
The lentivirus system enables efficient genetic modification of both dividing and non‐dividing cells and therefore is a useful tool for elucidating developmental processes and disease pathogenesis. The development of third‐generation lentiviruses has resulted in improved biosafety, low immunogenicity, and substantial packaging capabilities. However, because third‐generation lentiviruses require successful co‐transfection with four plasmids, this typically means that lower titers are attained. This is problematic, as it is often desirable to produce purified lentiviruses with high titers (>1 × 10 8 TU/ml), especially for in vivo applications. The manufacturing process for lentiviruses involves several critical experimental factors that can influence titer, purity, and transduction efficiency. Here, we describe a straightforward, stepwise protocol for the reproducible manufacture of high‐titer third‐generation lentiviruses (1 × 10 8 to 1 × 10 9 TU/ml). This optimized protocol enhances transgene expression by use of Lipofectamine transfection and optimized serum replacement medium, a single ultracentrifugation step, use of a sucrose cushion, and addition of a histone deacetylation inhibitor. Furthermore, we provide alternate methods for titration analyses, including functional and genomic integration analyses, using common laboratory techniques such as FACS as well as genomic DNA extraction and qPCR. These optimized methods will be beneficial for investigating developmental processes and disease pathogenesis in vitro and in vivo. © 2020 The Authors. Basic Protocol 1 : Lentivirus production Support Protocol : Lentivirus concentration Basic Protocol 2 : Lentivirus titration Alternate Protocol 1 : Determination of viral titration by FACS analysis Alternate Protocol 2 : Determination of viral titration by genome integration analysis

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