Epigenetically Controlled ZEB2 Expression Promotes the Cytotoxic Potential of CMV-Specific CD8⁺ T Cells

Area of Science:

• Immunology
• Epigenetics
• Cell Biology

Background:

• Zinc finger E-box binding protein 2 (ZEB2) is crucial for T cell differentiation.
• The specific role of ZEB2 in cytotoxic CD8+ T cells is not fully understood.
• Epigenetic regulation, particularly DNA methylation, influences T cell function.

Purpose of the Study:

• To investigate the regulatory role of ZEB2 in cytotoxic CD8+ T cells.
• To analyze DNA methylation patterns within the ZEB2 locus during T cell differentiation.
• To determine the functional impact of ZEB2 expression on virus-specific T cells.

Main Methods:

• DNA methylation analysis of human cytomegalovirus (CMV)-specific CD8+ T cells.
• Analysis of ZEB2 locus methylation during T cell differentiation.
• ZEB2 knockout experiments in CD8+ effector T cells.
• Gene expression profiling and cytotoxic killing assays.

Main Results:

• ZEB2 differentially methylated regions (DMRs) are demethylated during T cell differentiation, especially in terminally differentiated CD8+ and cytotoxic CD4+ T cells.
• ZEB2 DMR demethylation strongly correlates with ZEB2 expression across T cell subsets.
• ZEB2 knockout impairs cell-cell adhesion gene expression and reduces cytotoxic capacity in CMV-specific killing assays.
• DNA methylation patterns of ZEB2 DMRs are stable during long-term in vitro culture.

Conclusions:

• ZEB2 expression is epigenetically regulated by DNA demethylation during T cell differentiation.
• ZEB2 is essential for the differentiation of naive CD8+ T cells into effector and memory cells.
• ZEB2 regulates the functional properties, including cytotoxic capacity, of virus-specific CD8+ T cells.