Optimization of Polyplex Formation between DNA Oligonucleotide and Poly(ʟ-Lysine): Experimental Study and Modeling...

Area of Science:

• Biomaterials Science
• Gene Therapy
• Computational Biology

Background:

• Polyplexes, formed by nucleic acids and polycations, are crucial for gene therapy applications.
• Optimizing polyplex formation is key to enhancing their therapeutic efficacy.

Purpose of the Study:

• To optimize polyplex formation between double-stranded DNA (dsDNA) and poly(ʟ-Lysine) (PLL).
• To investigate the influence of pH and N/P ratio on binding efficiency.
• To elucidate the molecular mechanisms of polyplex formation using simulations.

Main Methods:

• Gel electrophoresis assays for binding efficiency quantification.
• Design of Experiments (DoE) and Response Surface Methodology (RSM) for optimization.
• Molecular dynamics simulations to study molecular mechanisms.

Main Results:

• N/P ratio significantly impacts binding efficiency more than pH.
• Maximal binding efficiency of 99.4% was achieved at pH 5.4 and N/P ratio of 125.
• Molecular dynamics simulations provided insights into the polyplex formation mechanism.

Conclusions:

• The study successfully optimized dsDNA-PLL polyplex formation for potential gene therapy applications.
• Experimental and modeling approaches confirmed optimal conditions for high binding efficiency.
• Molecular dynamics simulations offer a deeper understanding of the underlying molecular interactions.