Skip to main content Accessibility help

Probing DNA assembly into nanoparticles with short DNA

  • Preethi L. Chandran (a1) (a2), Emilios K. Dimitriadis (a1) and Ferenc Horkay (a1)


DNA is an anionic polyelectrolyte, which occupies a large volume in salt free solution due to the coulomb repulsion between the charged groups. In the presence of high valence cations, DNA condenses into nanoparticles. DNA nanoparticles have generated a lot of interest as a preferred vehicle for delivering therapeutic DNA in gene therapy. The efficiency of gene delivery is determined by stability and compactness of the particles. However not much is known about the organization of DNA within the particles. The large polymer cations condense DNA rapidly, with no distinct intermediate stages that give insight into the arrangement of DNA within the nanoparticle. In our work, we form nanoparticles with short DNA strands to slow down the condensation process. The polymer cation is polyethyleneimine with grafted sugar moieties. Distinct intermediate stages are observed with Atomic Force Microscopy. The assembly occurs via the formation of fiber condensates, which appear to be the unit of DNA condensation. Nanoparticles form by compaction of interweaving networks of fiber condensates.



Hide All
[1]Santhakumaran, L. M., Chen, A., Pillai, C. K. S., Thomas, T., He, H., and Thomas, T. J., Nanotechnology in Nonviral Gene Delivery: Wiley-VCH Verlag GmbH & Co. KGaA, 2005.
[2]Godbey, W. T., Wu, K. K., and Mikos, A. G., “Poly(ethylenimine) and its role in gene delivery,” Journal of Controlled Release, vol. 60, pp. 149160, 1999.
[3]Lőrincz, O., Tőke, E. R., Somogyi, E., Horkay, F., Chandran, P. L., Douglas, J. F., Szebeni, J., and Lisziewicz, J., “Structure and biological activity of pathogen-like synthetic nanomedicines,” Nanomedicine: nanotechnology, biology, and medicine, 2011.
[4]Giersig, M., Khomutov, G. B., Kasyanenko, N., and Afanasieva, D., “DNA Self-Assembling Nanostructures Induced by Trivalent Ions and Polycations,” in Nanomaterials for Application in Medicine and Biology, ed: Springer Netherlands, 2008, pp. 2938.
[5]Toke, E. R., Lorincz, O., Somogyi, E., and Lisziewicz, J., “Rational development of a stable liquid formulation for nanomedicine products,” International Journal of Pharmaceutics, vol. 392, pp. 261267, 2010.
[6]Dunlap, D. D., Maggi, A., Soria, M. R., and Monaco, L., “Nanoscopic structure of DNA condensed for gene delivery,” Nucleic Acids Research, vol. 25, pp. 3095-3101, August 1, 1997 1997.
[7]Arscott, P. G., Li, A. Z., and Bloomfield, V. A., “Condensation of DNA by trivalent cations.1. Effects of DNA length and topology on the size and shape of condensed particles,” Biopolymers, vol. 30, pp. 619630, 1990.
[8]Mann, A., Richa, R., and Ganguli, M., “DNA condensation by poly-l-lysine at the single molecule level: Role of DNA concentration and polymer length,” Journal of Controlled Release, vol. 125, pp. 252262, 2007.


Related content

Powered by UNSILO

Probing DNA assembly into nanoparticles with short DNA

  • Preethi L. Chandran (a1) (a2), Emilios K. Dimitriadis (a1) and Ferenc Horkay (a1)


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed.