GFI1-driven transcriptional and epigenetic programs maintain CD8⁺ T cell stemness and persistence

Area of Science:

• Immunology
• Cellular Biology
• Virology

Background:

• Long-lived memory CD8+ T cells are vital for controlling persistent viral infections.
• Mechanisms preserving memory CD8+ T cell populations remain largely unknown.
• Understanding these mechanisms is critical for developing effective antiviral therapies.

Purpose of the Study:

• To investigate the role of the transcriptional repressor GFI1 in memory CD8+ T cell maintenance.
• To elucidate the molecular pathways regulated by GFI1 in virus-specific CD8+ T cells.

Main Methods:

• Utilized fate mapping to track GFI1 expression in CD8+ T cells.
• Generated GFI1-deficient mouse models to assess its impact on T cell populations.
• Analyzed the expression of key transcription factors (EOMES, BCL-2) following GFI1 ablation.

Main Results:

• GFI1 is selectively expressed in stem cell memory and central memory CD8+ T cells.
• GFI1 deletion resulted in reduced T cell proliferation and progressive loss of memory cells.
• GFI1 ablation led to downregulation of EOMES and BCL-2, impacting T cell persistence.

Conclusions:

• GFI1 plays a critical role in the long-term maintenance of memory CD8+ T cells.
• GFI1 sustains the proliferative potential necessary for memory T cell survival during chronic infections.
• Targeting GFI1 may offer a strategy to enhance immune responses against persistent viral pathogens.