Improved gene expression using low molecular weight peptides produced from protamine sulfate.

Area of Science:

• Biochemistry
• Molecular Biology
• Biotechnology

Background:

• DNA condensation is crucial for non-viral gene delivery, impacting transfection and expression.
• Protamine is a natural DNA condensation agent used in gene delivery.
• Optimizing DNA condensation carriers is key to enhancing gene therapy efficacy.

Purpose of the Study:

• To investigate the DNA condensation ability and gene transfection efficiency of enzymatically produced low molecular weight protamine fragments (LMWPs).
• To evaluate LMWPs as potential gene delivery carriers with improved safety and efficacy compared to protamine.

Main Methods:

• Selective enzymatic digestion of protamine to generate LMWPs of varying lengths and compositions.
• Assessment of DNA condensation capability, particle size, and DNA binding strength of LMWPs.
• In vitro gene delivery studies to measure gene transfection and expression duration.

Main Results:

• LMWPs exhibited reduced DNA binding strength compared to native protamine.
• Certain LMWPs formed compact DNA condensates with small particle sizes (~100 nm).
• LMWP-mediated gene delivery resulted in prolonged in vitro gene expression (up to 12 days).

Conclusions:

• Designing DNA condensers with tunable binding strengths and condensation abilities can improve gene expression and gene therapy outcomes.
• LMWPs demonstrate potential as effective and safer gene delivery agents due to their low immunogenicity and controlled DNA condensation.
• LMWPs offer a promising strategy for enhancing the efficiency and safety of non-viral gene delivery systems.