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  • Title: Id2 reinforces TH1 differentiation and inhibits E2A to repress TFH differentiation.
    Author: Shaw LA, Bélanger S, Omilusik KD, Cho S, Scott-Browne JP, Nance JP, Goulding J, Lasorella A, Lu LF, Crotty S, Goldrath AW.
    Journal: Nat Immunol; 2016 Jul; 17(7):834-43. PubMed ID: 27213691.
    Abstract:
    The differentiation of helper T cells into effector subsets is critical to host protection. Transcription factors of the E-protein and Id families are important arbiters of T cell development, but their role in the differentiation of the TH1 and TFH subsets of helper T cells is not well understood. Here, TH1 cells showed more robust Id2 expression than that of TFH cells, and depletion of Id2 via RNA-mediated interference increased the frequency of TFH cells. Furthermore, TH1 differentiation was blocked by Id2 deficiency, which led to E-protein-dependent accumulation of effector cells with mixed characteristics during viral infection and severely impaired the generation of TH1 cells following infection with Toxoplasma gondii. The TFH cell-defining transcriptional repressor Bcl6 bound the Id2 locus, which provides a mechanism for the bimodal Id2 expression and reciprocal development of TH1 cells and TFH cells.
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