Conclusions
Although the nuclear import of DNA may not be a normal event in the cell, mechanisms do exist for its transport. Some of these have evolved over a billion years, as viruses and other pathogens have perfected ways to invade the host, while others appear to be fortuitous piracy, as in the case of the SV40 enhancer which binds to proteins on their way to the nucleus. Regardless, the mechanism is the same: NLS-containing proteins, either provided by the host or pathogen, bind to the DNA and target it to the nucleus. The goal of all gene therapy approaches is to target enough DNA to the nuclei of cells to obtain sufficient expression for a therapeutic effect. As is well accepted, one of the major barriers to this goal is the nuclear envelope and our relative inability to target substantial amounts of DNA to the nucleus. By characterizing and understanding the mechanisms of DNA nuclear import we can begin to exploit these pathways to increase the nuclear targeting of genes for transfection, transgenic plant production, and ultimately, gene therapy.
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Dean, D.A., Gokay, K.E. (2005). Nuclear Import of DNA. In: Nuclear Import and Export in Plants and Animals. Molecular Biology Intelligence Unit. Springer, Boston, MA. https://doi.org/10.1007/0-387-27747-1_12
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