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• W1999332457 abstract "Several gene transfer techniques that employ 'naked DNA' molecules have recently been developed and numerous gene therapy protocols that make use of 'naked-DNA' have been proposed. We studied the possibility of enhancing the stability of 'naked DNA vectors' and thus also gene transfer and expression efficiencies, by constructing phosphorothioate (PS-) double strand DNA molecules and functional transcription units. We first synthesized short PS-double strand DNA molecules by the annealing of two complementary, 35 nt long, oligonucleotides. The accessibility of DNA modifying enzymes to this molecule was significantly decreased: T4-ligase and kinase activity were respectively reduced up to 1/2 and to 1/6, as compared to the normal phosphodiester molecule. Nucleolytic stability was increased either to purified enzymes (DNase I and Bal31) or to incubations in fresh serum, cell culture medium or in muscle protein extract. Phosphorothioate end-capped complete eukaryotic transcription units (obtained by Taq polymerase amplification with PS-primers) were not significantly protected from nucleolytic attack. On the contrary, synthetic transcription units, 'mini genes', obtained by Taq amplification with 1, 2 or 3 PS-dNTP substitutions, were resistant to DNase I and Bal31 nucleolytic activity. Transcription efficiency, driven by the T7 promoter, was 96.5, 95 and 33.5% (respectively with 1, 2 or 3 substitutions), as compared to the normal phosphodiester molecules." @default.
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• W1999332457 date "1995-01-01" @default.
• W1999332457 modified "2023-10-01" @default.
• W1999332457 title "Stability and functional effectiveness of phosphorothioate modified duplex DNA and synthetic ‘mini-genes’" @default.
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• W1999332457 doi "https://doi.org/10.1093/nar/23.20.4134" @default.
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