Loss of Zfp335 triggers cGAS/STING-dependent apoptosis of post-β selection pre-T cells
Ratiu, J. J.; Barclay, W. E.; Wang, Q.; Mehta, N.; Harnois, M. J.; DiPalma, D.; Wellford, S.; Roy, S.; Contreras, A.; Wiest, D.; Zhuang, Y.
Show abstract
Production of a diverse peripheral T cell compartment requires massive expansion of the bone marrow progenitors that seed the thymus. There are two main phases of expansion during T cell development, following T lineage commitment at the DN2 stage and following successful rearrangement and selection for functional TCR{beta} chains in DN3 thymocytes, which promotes development of DN4 cells to the DP stage. Signals driving expansion of DN2 thymocytes are well studied, however, factors regulating the proliferation and survival of DN4 cells remain poorly understood. Here, we uncover an unexpected link between the transcription factor Zfp335 and control of cGAS/STING-dependent cell death in post-{beta}-selection DN4 thymocytes. Zfp335 controls survival by sustaining expression of Ankle2, which suppresses cGAS/STING-dependent cell death. Together, this study identifies Zfp335 as a key transcription factor controlling the survival of proliferating post-{beta}-selection thymocytes and demonstrates a key role for the cGAS/STING pathway driving apoptosis of developing T cells.
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