The transcription factor c-Maf is essential for the commitment of IL-17-producing γδ T cells

Nature Immunology
Matthew K ZuberbuehlerMaria Ciofani

Abstract

γδ T cells that produce the cytokine IL-17 (Tγδ17 cells) are innate-like mediators of immunity that undergo effector programming in the thymus. While regulators of Tγδ17 specialization restricted to various Vγ subsets are known, a commitment factor essential to all Tγδ17 cells has remained undefined. In this study, we identified the transcription factor c-Maf as a universal regulator of Tγδ17 cell differentiation and maintenance. Maf deficiency caused an absolute lineage block at the immature CD24+CD45RBlo γδ thymocyte stage, which revealed a critical checkpoint in the acquisition of effector functions. Here, c-Maf enforced Tγδ17 cell identity by promoting chromatin accessibility and expression of key type 17 program genes, notably Rorc and Blk, while antagonizing the transcription factor TCF1, which promotes interferon-γ-producing γδ T cells (Tγδ1 cells). Furthermore, γδ T cell antigen receptor (γδTCR) signal strength tuned c-Maf expression, which indicates that c-Maf is a core node that connects γδTCR signals to Tγδ17 cell transcriptional programming.

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Methods Mentioned

BETA
flow
immunoprecipitation
ChIP-seq
ChIP
RNA-seq
density gradient centrifugation
transfection
Assay
PCR

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