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Innate lymphoid cells (ILCs) play a central role conferring protection at the mucosal frontier. In this study, we have identified a requirement of the transcription factor Zbtb1 for the development of RORγt + ILCs (ILC3s). Zbtb1-deficient mice lacked NKp46 + ILC3 cells in the lamina propria of the small and large intestine. This requirement of Zbtb1 was cell intrinsic, as NKp46 + ILC3s were not generated from Zbtb1-deficient progenitors in bone marrow chimeras and Zbtb1-deficient RORγt + CCR6 - NKp46 - ILC3s didn't generate NKp46 + ILC3s in co-cultures with OP9-DL1 stroma. In correlation with this impairment, Zbtb1-deficient ILC3 cells failed to upregulate T-bet expression, and to acquire IFN-γ production characteristic of NKp46 + cells. Finally, absence of NKp46 + ILC3 cells combined with the absence of T-cells in Zbtb1-deficient mice, led to a transient susceptibility to C. rodentium infections. Altogether, these results establish that Zbtb1 is essential for the development of NKp46 + ILC3 cells.

Zbtb1 controls NKp46+ ROR-gamma-T+ innate lymphoid cell (ILC3) development