Abstract
The transience of transgene expression is a major obstacle in the development of nonviral vectors. The CpG-free and pLIVE plasmids reportedly achieve long-term transgene expression in mouse liver. In this work, the anti-silencing elements within these plasmids were studied. The effects of plasmid that was being silenced on transgene expression from the CpG-free plasmid and those of transgene expression at early time points on silencing were also examined. The results suggested that the backbone sequence of the CpG-free plasmid and the 3' untranslated region of the albumin gene of the pLIVE plasmid contribute to durable expression. In addition, no influence of the silencing of another plasmid on the duration of CpG-free plasmid expression or of transgene expression at early time points on silencing was detected.
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