A novel method for DNA delivery into bacteria using cationic copolymers

Area of Science:

• Polymer Chemistry
• Microbiology
• Biotechnology

Background:

• Amphiphilic copolymers are utilized in various medical and biotechnological applications, notably DNA transfection in eukaryotic cells.
• However, polymer-mediated transfection of prokaryotic cells remained undescribed, limiting biotechnological applications.

Purpose of the Study:

• To synthesize amphiphilic copolymers with controlled properties using reversible deactivation radical polymerization.
• To investigate the efficacy of these synthesized polymers in transfecting non-competent prokaryotic cells, specifically Escherichia coli.

Main Methods:

• Utilized reversible addition-fragmentation chain transfer (RAFT) polymerization to synthesize amphiphilic copolymers.
• Designed copolymers with varying ratios of poly[2-(dimethyl-amino) ethyl methacrylate] (a hydrophilic component) and poly[methyl methacrylate] (a hydrophobic component).
• Assessed the binding of synthesized copolymers to pUC-19 DNA and their subsequent transfection efficiency in Escherichia coli DH5α.

Main Results:

• Successfully synthesized amphiphilic copolymers with well-defined characteristics.
• Demonstrated successful binding of copolymers to plasmid DNA.
• Achieved prokaryotic cell transformation with efficiencies in the range of 10^3 colony-forming units per µg of plasmid DNA.

Conclusions:

• Established a novel method for prokaryotic cell transformation using synthesized amphiphilic copolymers.
• Highlighted the importance of controlled amphiphilic/hydrophobic ratios in polymer design for effective transfection.
• Opened new possibilities for polymer-based genetic manipulation in prokaryotes.