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DNA-poly(diallyldimethylammonium chloride) complexation and transfection efficiency.

Manuel Alatorre-Meda1, Pablo Taboada, Barbara Krajewska

  • 1Grupo de Nanomateriales y Materia Blanda, Departamento de Física de la Materia Condensada, Facultad de Física, Universidad de Santiago de Compostela, E-15782 Santiago de Compostela, Spain. manuel_alatorre@yahoo.com.mx

The Journal of Physical Chemistry. B
|July 9, 2010
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Summary

The charge density of poly(diallyldimethylammonium chloride) (pDADMAC) impacts DNA compaction, while valence affects polyplex size. High binding affinity limits DNA transfection efficiency.

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Area of Science:

  • Polymer Science
  • Biophysics
  • Gene Delivery

Background:

  • Poly(diallyldimethylammonium chloride) (pDADMAC) is a cationic polymer used for DNA compaction.
  • Understanding the influence of polymer properties on DNA complex formation is crucial for gene delivery applications.

Purpose of the Study:

  • To investigate how cationic charge density (CD) and valence of pDADMAC affect DNA compaction and transfection.
  • To characterize DNA-pDADMAC complexes (polyplexes) using various biophysical techniques.

Main Methods:

  • Utilized conductometry, electrophoretic mobility (zeta-potential), dynamic light scattering (DLS), isothermal titration calorimetry (ITC), and atomic force microscopy (AFM).
  • Assessed transfection efficiency using beta-galactosidase and luciferase expression assays.
  • Studied four pDADMAC homopolymers and one copolymer with varying CD and valence.

Main Results:

  • All polyplexes formed compact, stable structures (~100 nm) with positive surface charges (~11 mV) but exhibited low transfection efficiencies.
  • DNA-pDADMAC complexation showed high binding affinity, driven by entropy.
  • DNA compaction ratio ((N/P)c) was governed by CD, while the size-stabilizing ratio ((N/P)*) depended on valence.

Conclusions:

  • Cationic charge density and valence of pDADMAC significantly influence DNA compaction and polyplex characteristics.
  • High binding affinity and a presumed core-shell structure contribute to limited DNA transfection rates.
  • Further research may explore strategies to mitigate high binding affinity for improved gene delivery efficacy.