Efficient Editing of the CXCR4 Locus Using Cas9 Ribonucleoprotein Complexes Stabilized with Polyglutamic Acid

Area of Science:

• Molecular Biology
• Gene Therapy
• Immunology

Background:

• CRISPR/Cas9 gene editing offers potential for treating human diseases.
• Enhancing gene editing efficiency is critical for therapeutic applications.
• The CXCR4 gene is a key target for HIV gene therapy.

Purpose of the Study:

• To improve the efficiency of CRISPR/Cas9 gene editing.
• To enhance the editing of the CXCR4 locus for HIV gene therapy.
• To investigate methods for increasing gene knockout and knock-in levels.

Main Methods:

• Modified the Cas9 protein by adding Nuclear Localization Signals (NLS).
• Stabilized Cas9 and guide RNA ribonucleoprotein complexes using poly-L-glutamic acid.
• Assessed editing efficiency in CEM/R5 T cell lines and primary CD4+ T lymphocytes.

Main Results:

• Achieved a 1.8-fold increase in CXCR4 knockout in a T cell line.
• Demonstrated a 2-fold increase in knock-in of the MT-C34 HIV-1 fusion peptide inhibitor in primary CD4+ T cells.
• The modifications significantly enhanced gene editing outcomes.

Conclusions:

• The developed approach effectively increases CRISPR/Cas9 gene editing efficiency.
• This method holds promise for advancing gene therapy strategies for HIV infection.
• Optimized gene editing techniques are vital for successful therapeutic interventions.