Interleukin-17-Producing γδ T Cells Originate from SOX13⁺ Progenitors that Are Independent of γδTCR Signaling.

Lineage-committed αβ and γδ T cells are thought to originate from common intrathymic multipotent progenitors following instructive T cell receptor (TCR) signals. A subset of lymph node and mucosal Vγ2⁺ γδ T cells is programmed intrathymically to produce IL-17 (Tγδ17 cells), however the role of the γδTCR in development of these cells remains controversial. Here we generated reporter mice for the Tγδ17 lineage-defining transcription factor SOX13 and identified fetal-origin, intrathymic Sox13⁺ progenitors. In organ culture developmental assays, Tγδ17 cells derived primarily from Sox13⁺ progenitors, and not from other known lymphoid progenitors. Single cell transcriptome assays of the progenitors found in TCR-deficient mice demonstrated that Tγδ17 lineage programming was independent of γδTCR. Instead, generation of the lineage committed progenitors and Tγδ17 cells was controlled by TCF1 and SOX13. Thus, T lymphocyte lineage fate can be prewired cell-intrinsically and is not necessarily specified by clonal antigen receptor signals.

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