Optimized RNP transfection for highly efficient CRISPR/Cas9-mediated gene knockout in primary T cells

Area of Science:

• Molecular Biology
• Immunology
• Gene Editing Technologies

Background:

• CRISPR/Cas9 is a key tool for gene knockouts in various species.
• Efficient gene editing in primary T cells is crucial for research and T cell-based immunotherapies, including CAR T cells.
• Previous CRISPR/Cas9 methods for T cells had variable efficiency and required T cell receptor stimulation, limiting gene function studies.

Purpose of the Study:

• To develop an optimized CRISPR/Cas9 gene editing method for primary T cells.
• To achieve high gene knockout efficiency without T cell receptor stimulation.
• To facilitate gene discovery and simplify the development of next-generation immunotherapies.

Main Methods:

• Optimized Cas9 ribonucleoprotein (RNP) transfection protocol.
• Application to primary mouse and human T cells.
• Elimination of T cell receptor stimulation requirement.

Main Results:

• Near-complete loss of target gene expression at the population level.
• Mitigation of the need for selection post-transfection.
• Successful application in both primary mouse and human T cells.

Conclusions:

• The optimized method significantly enhances the feasibility of target gene discovery and validation in primary T cells.
• This approach simplifies gene editing for developing advanced immunotherapies.
• The method holds promise for accelerating research in T cell biology and immunotherapy development.