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A RORE-dependent Intronic Enhancer in the IL-7 Receptor-α Locus Controls Glucose Metabolism via Vγ4+ γδT17 Cells.

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Researchers identified a novel enhancer, CNS9, crucial for Interleukin-7 receptor alpha (IL-7Rα) expression in specific T cells. This finding impacts understanding of adipose tissue homeostasis and may influence type 2 diabetes risk.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Metabolic Disease Research

Background:

  • Interleukin-7 receptor (IL-7R) is vital for T cell regulation in peripheral tissues.
  • While IL-7Rα enhancers in αβ T cells are known, those in γδ T cells remain uncharacterized.

Purpose of the Study:

  • To identify and characterize novel enhancers regulating IL-7Rα expression in γδ T cells.
  • To investigate the functional role of a newly discovered enhancer, CNS9, in T cell homeostasis and metabolic regulation.

Main Methods:

  • Identification of a conserved noncoding sequence (CNS9) in the IL-7Rα locus.
  • In vitro assays to assess RORγt-dependent enhancer activity of CNS9.
  • Generation and analysis of CNS9-RORmut mice to evaluate in vivo function.

Main Results:

  • CNS9 functions as a RORγt-dependent enhancer, specifically for IL-7Rα in Vγ4+ γδ T cells.
  • CNS9 mutations reduced IL-7Rα expression, Vγ4+ γδ T cell numbers, and IL-17A production in adipose tissue.
  • Reduced IL-17A correlated with decreased IL-33, fewer regulatory T cells, and glucose intolerance in mutant mice.

Conclusions:

  • CNS9 is a Vγ4+ γδ T cell-specific IL-7Rα enhancer regulated by RORγt.
  • This enhancer plays a key role in adipose tissue homeostasis through regulatory T cells.
  • The conserved RORE in IL-7Rα intron 2 may impact type 2 diabetes incidence.