Browsing by Author "Fiancette, Rémi"

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    Bcl6 is a subset-defining transcription factor of lymphoid tissue inducer-like ILC3
    (Cell Press, 2023) Tachó-Piñot, Roser; Stamper, Christopher T.; King, James I.; Matei-Rascu, Veronika; Richardson, Erin; Li, Zhi; Roberts, Luke B.; Bassett, John W.; Melo-Gonzalez, Felipe; Fiancette, Rémi; Lin, I-Hsuan; Dent, Alexander; Harada, Yohsuke; Finlay, Conor; Mjösberg, Jenny; Withers, David R.; Hepworth, Matthew R.; Microbiology and Immunology, School of Medicine
    Innate lymphoid cells (ILCs) are tissue-resident effector cells with roles in tissue homeostasis, protective immunity, and inflammatory disease. Group 3 ILCs (ILC3s) are classically defined by the master transcription factor RORγt. However, ILC3 can be further subdivided into subsets that share type 3 effector modules that exhibit significant ontological, transcriptional, phenotypic, and functional heterogeneity. Notably lymphoid tissue inducer (LTi)-like ILC3s mediate effector functions not typically associated with other RORγt-expressing lymphocytes, suggesting that additional transcription factors contribute to dictate ILC3 subset phenotypes. Here, we identify Bcl6 as a subset-defining transcription factor of LTi-like ILC3s in mice and humans. Deletion of Bcl6 results in dysregulation of the LTi-like ILC3 transcriptional program and markedly enhances expression of interleukin-17A (IL-17A) and IL-17F in LTi-like ILC3s in a manner in part dependent upon the commensal microbiota-and associated with worsened inflammation in a model of colitis. Together, these findings redefine our understanding of ILC3 subset biology.