Capicua deficiency induces autoimmunity and promotes follicular helper T cell differentiation via derepression of ETV5

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Abstract

High-affinity antibody production through the germinal centre (GC) response is a pivotal process in adaptive immunity. Abnormal development of follicular helper T (T(FH)) cells can induce the GC response to self-antigens, subsequently leading to autoimmunity. Here we show the transcriptional repressor Capicua/CIC maintains peripheral immune tolerance by suppressing aberrant activation of adaptive immunity. CIC deficiency induces excessive development of T(FH) cells and GC responses in a T-cell-intrinsic manner. ETV5 expression is derepressed in Cic null T(FH) cells and knockdown of Etv5 suppresses the enhanced T(FH) cell differentiation in Cic-deficient CD4+ T cells, suggesting that Etv5 is a critical CIC target gene in T(FH) cell differentiation. Furthermore, we identify Maf as a downstream target of the CIC-ETV5 axis in this process. These data demonstrate that CIC maintains T-cell homeostasis and negatively regulates T(FH) cell development and autoimmunity.

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Park, S., Lee, S., Lee, C. G., Park, G. Y., Hong, H., Lee, J. S., … Lee, Y. (2017). Capicua deficiency induces autoimmunity and promotes follicular helper T cell differentiation via derepression of ETV5. Nature Communications, 8. https://doi.org/10.1038/ncomms16037

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