Abstract
Lentivirus is an efficient gene transfer system that is widely used in basic science. We aimed to improve viral titer by applying an ultra-expression vectors to lentiviral packaging. Application of the ultra-expression vectors increased biological titer 4 times for standard preparation. We also evaluated the efficacy of the ultra-expression vectors to relatively longer insert fragments, such as CSII-CMV-CNROE containing 5 genes in multiple cloning sites. Packaging of the ultra-expression vectors showed 3.5 times higher biological titer compared with the original method. Our improved packaging system could be applied to lentivirus to produce higher titers.
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