Regulation of CD8 T Cell Differentiation by the RNA-Binding Protein DDX5

The RNA-binding protein DEAD-box protein 5 (DDX5) is a polyfunctional regulator of gene expression, but its role in CD8(+) T cell biology has not been extensively investigated. In this study, we demonstrate that deletion of DDX5 in murine CD8(+) T cells reduced the differentiation of terminal effector, effector memory T, and terminal effector memory cells while increasing the generation of central memory T cells, whereas forced expression of DDX5 elicited the opposite phenotype. DDX5-deficient CD8(+) T cells exhibited increased expression of genes that promote central memory T cell differentiation, including Tcf7 and Eomes. Taken together, these findings reveal a role for DDX5 in regulating the differentiation of effector and memory CD8(+) T cell subsets in response to microbial infection.