Duration of expression and activity of Sleeping Beauty transposase in mouse liver following hydrodynamic DNA delivery.

Molecular Therapy : the Journal of the American Society of Gene Therapy
Jason B BellPerry B Hackett

Abstract

The Sleeping Beauty (SB) transposon system can direct integration of DNA sequences into mammalian genomes. The SB system comprises a transposon and transposase that "cuts" the transposon from a plasmid and "pastes" it into a recipient genome. The transposase gene may integrate very rarely and randomly into genomes, which has led to concerns that continued expression might support continued remobilization of transposons and genomic instability. Consequently, we measured the duration of SB11 transposase expression needed for remobilization to determine whether continued expression might be a problem. The SB11 gene was expressed from the plasmid pT2/mCAGGS-Luc//UbC-SB11 that contained a luciferase expression cassette in a hyperactive SB transposon. Mice were imaged and killed at periodic intervals out to 24 weeks. Over the first 2 weeks, the number of plasmids with SB11 genes and SB11 mRNA dropped about 90 and 99.9%, respectively. Expression of the luciferase reporter gene in the transposon declined about 99% and stabilized for 5 months at nearly 1,000-fold above background. In stark contrast, transposition-supporting levels of SB11 mRNA lasted only about 4 days postinfusion. Thus, within the limits of current technology, we show ...Continue Reading

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