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Learn MoreIL-17-producing gd T (Tgd17) cells are early mediators of immunity and autoimmunity that undergo effector programming in the thymus. While Vg subset-restricted regulators of Tgd17 specialization are known, a universal type 17 commitment factor for all gd T cells remains undefined. In this study, we identify the transcription factor c-Maf as an essential and uniform regulator of Tgd17 differentiation and maintenance. The absolute lineage block caused by Maf deficiency reveals a critical effector acquisition checkpoint at the immature CD24+ CD45RBlo gd thymocyte stage. Here, c-Maf enforces Tgd17 identity by promoting chromatin accessibility and activating expression of lineage-defining RORgt and key type 17 program genes, while coordinately antagonizing the negative regulator TCF1, which promotes the alternative IFNg+ Tgd1 fate. During specialization, c-Maf expression is tuned by gdTCR signal strength, implicating c-Maf as a rheostat controlling effector gd T cell generation and connecting gdTCR signals to a core node in the Tgd17 network. SOURCE: Maria Ciofani (maria.ciofani@duke.edu) - Duke University Medical Center
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