p53 Hinders CRISPR/Cas9-Mediated Targeted Gene Disruption in Memory CD8 T Cells In Vivo

Area of Science:

• Immunology
• Molecular Biology
• Gene Editing

Background:

• CRISPR/Cas9 technology enables efficient gene editing across various cell types.
• Genetic alteration of Ag-experienced memory CD8 T cells using CRISPR/Cas9 has not been previously demonstrated.

Purpose of the Study:

• To establish a method for CRISPR/Cas9-mediated gene editing in memory CD8 T cells.
• To investigate the impact of gene editing on the function of memory CD8 T cells upon antigen re-encounter.

Main Methods:

• CRISPR/Cas9 gene editing was applied to memory CD8 T cells.
• The role of the p53 transcription factor in response to DNA damage from gene editing was assessed.
• Temporary inhibition of p53 function was achieved using p53 siRNA in a mouse model.

Main Results:

• CRISPR/Cas9 gene editing in memory CD8 T cells inhibited their proliferation post-antigen re-encounter.
• This inhibitory effect was mediated by the proapoptotic transcription factor p53.
• Transient p53 inhibition enabled DNA repair, facilitating restored proliferation and recall responses.

Conclusions:

• CRISPR/Cas9 technology can be successfully adapted for gene editing in memory CD8 T cells in vivo.
• Targeted p53 inhibition is crucial for overcoming proliferation defects and enabling functional gene editing in these cells.
• This breakthrough opens new avenues for studying and manipulating memory CD8 T cell function.