Targeting the fate of exhausted CD8+ T cells.

CD8+ T cell exhaustion is increasingly recognized as a regulated adaptation to chronic antigenic stimulation rather than a simple immune failure. Indeed, recent studies reveal that exhaustion is imprinted early after T cell activation, integrating transcriptional and epigenetic cues to balance effector function with long-term persistence. Key regulators, including Inhibitor of DNA binding 3 (ID3), Thymocyte selection high mobility box protein (TOX), MYB, Krüppel-like factor 2 (KLF2), and Special AT-rich sequencing binding protein 1 (SATB1), orchestrate this process, preserving stem-like precursor populations that sustain immunity during chronic infection and cancer. This emerging view frames exhaustion as a context-dependent extension of the memory program rather than its collapse. By defining the molecular and functional logic of exhaustion, we highlight how these insights can inform new approaches to manipulate T cell fate for therapeutic benefit.