Abstract
Minicircle DNA is a promising tool in the field of gene therapy, whose products are increasingly gaining market access. Greater transfection efficiency and longer expression time as well as lower immunogenicity contrast with cost-intensive production, which also stands in the way of a broader use of the advantages of this technology in research. Starting from a commercial minicircle production kit a simple protocol for the cost-effective small-scale production of high-quality minicircle DNA to be used at a research scale has been developed by combining and improving procedures of various publications. An optimized size-exclusion chromatography method led to almost pure minicircle DNA with a superior proportion of the desired supercoiled plasmid conformation. The pharmaceutical potential of the produced minicircle DNA was investigated in vitro by real-time impedance assays in a tumor cell model in case of coded suicide genes as well as by ELISA of the translation product in case of coded human coagulation factor IX.
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