Abstract
IL-17-committed γδ T (γδT17) cells participate in many immune responses but their developmental requirements and subset specific functions remain poorly understood. Here we report that a commonly used CD45.1+ congenic C57BL/6 mouse substrain is characterized by a selective deficiency in Vγ4+ γδT17 cells. This trait is due to a spontaneous mutation in the transcription factor Sox13 that causes an intrinsic defect in development of these cells in the neonatal thymus. γδT17 cells migrate at low rates from skin to lymph nodes. In a model of psoriasis-like dermatitis, Vγ4+ γδT17 cells expand markedly in lymph nodes and home to inflamed skin. Sox13 mutant mice are protected from psoriasis-like skin changes, identifying a role for Sox13-dependent γδT17 cells in this inflammatory condition.
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