T cell differentiation

T cell differentiation is a tightly regulated biological process by which hematopoietic stem cells develop into mature, functionally distinct T lymphocytes. This involves several stages: - Hematopoietic stem cells in the bone marrow give rise to common lymphoid progenitors that migrate to the thymus. - In the thymus, these progenitors undergo sequential developmental stages—double-negative (DN), double-positive (DP), and single-positive (SP)—characterized by changes in surface markers such as CD4 and CD8. - Positive and negative selection processes ensure self-tolerance while promoting functional diversity. - Mature naïve T cells exit into peripheral tissues where further activation leads to their specialization into effector subsets such as helper T cells (Th1, Th2, Th17), cytotoxic T cells, regulatory T cells, or memory phenotypes depending on antigen exposure and cytokine environment. The metabolic state of differentiating T cells is dynamically regulated by signaling pathways including Notch and IL‑7/JAK‑STAT. These influence energy metabolism—shifting between glycolysis and fatty acid oxidation—to support proliferation or memory formation. Transcription factors like mTOR/AMPK/BCL6/IRF4/Foxo/MYC also play key roles at various checkpoints during lineage commitment. Dysregulation of this complex program can contribute to cancer progression, autoimmunity/inflammation, or impaired infection control[1][2][3][4].

Other names

T lymphocyte differentiationT-cell differentiationT-lymphocyte differentiationT cell development