Abstract
Efficiency and specificity are two key attributes of anti-cancer drugs including genetic therapeutic agents. We suggest a way to improve specificity of gene therapy drugs based on the ability of 3′-untranslated regions (UTR) of some mRNAs selectively stabilize transcripts only during cell division. The mRNAs of genes encoding DNA methyltransferase I (DNMT1) and topoisomerase IIα (TOP2A) are among such transcripts. When inserted into genetic constructs designed to produce therapeutic protein in tumor cells, such 3′-UTR would lead to diminished effect of therapeutic protein on normal cells, which are characterized by low or absent proliferative activity. However, when included in gene expression cassette, these 3′-UTR might result in decreased transgene expression, thus, overweighting the advantage of increased specificity of expression. We showed that DNMT1 and to the lesser extent TOP2A 3′-UTR do not alter significantly therapeutic transgene expression level in tumor cells, thus, confirming the functionality of the proposed approach.
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Acknowledgements
This work was supported by the Russian Federal Agency for Science and Innovation (contract #02.522.11.2005) and Molecular and Cell Biology Program of Russian Academy of Sciences.
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The described principle to increase specificity of transgene expression in proliferating cells and the described embodiment of this principle is a patent pending in Russian Federation (filed by the Institute of Molecular Genetics, Russian Academy of Sciences).
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Supplementary Information accompanies the paper on Cancer Gene Therapy website
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Shepelev, M., Korobko, E., Georgiev, G. et al. Application of mRNA regulatory regions to improve tumor specificity of transgene expression. Cancer Gene Ther 18, 682–684 (2011). https://doi.org/10.1038/cgt.2011.33
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DOI: https://doi.org/10.1038/cgt.2011.33