Enhanced gene disruption by programmable nucleases delivered by a minicircle vector

Area of Science:

• Molecular Biology
• Gene Editing Technologies
• Biotechnology

Background:

• Programmable nucleases, including zinc finger nucleases (ZFNs) and transcription activator-like effector nucleases (TALENs), are crucial for targeted genetic modification.
• Minicircle vectors offer advantages over conventional plasmids for transgene delivery due to their lack of extraneous bacterial sequences.

Purpose of the Study:

• To evaluate the efficacy and safety of using minicircle vectors for delivering programmable nucleases into human cells.
• To compare minicircle vector-mediated delivery with conventional plasmid delivery for gene editing applications.

Main Methods:

• Transient transfection of human cells (293T) with minicircle vectors and conventional plasmids carrying programmable nucleases.
• Assessment of gene editing efficiency using surrogate reporter assays and T7 endonuclease analyses.
• Evaluation of vector copy number, nuclease transcript levels, and cell viability (trypan blue, annexin V, propidium iodide staining).

Main Results:

• Minicircle vector delivery resulted in significantly higher mutation frequencies at target sites compared to conventional plasmids.
• Higher vector copy number and programmable nuclease transcript levels were observed with minicircle vectors.
• Minicircle vector transfection led to significantly higher cell viability, indicating reduced toxicity.

Conclusions:

• Minicircle vectors provide a more efficient, safer, and less toxic method for delivering programmable nucleases (ZFNs and TALENs) for gene disruption.
• Minicircle vectors represent an advanced and improved delivery system for programmable nucleases in biomedical research and biotechnology.