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A conserved enhancer regulates Il9 expression in multiple lineages.

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Researchers identified a key regulatory element, Il9 CNS-25/IL9 CNS-18, crucial for controlling Interleukin-9 (IL-9) production. This finding impacts understanding of IL-9

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Cytokine gene expression is controlled by regulatory elements.
  • The specific regulatory elements for Interleukin-9 (IL-9), a cytokine involved in allergy, autoimmunity, and tumor immunity, were previously undefined.

Purpose of the Study:

  • To identify and characterize the cis-regulatory elements controlling IL-9 gene expression.
  • To investigate the functional role of a newly identified enhancer in IL-9 production and related immune responses.

Main Methods:

  • Identification of a novel enhancer (CNS-25) upstream of the Il9 gene in mice.
  • Germline deletion of the enhancer in mice to assess its impact on gene regulation and IL-9 production.
  • Analysis of transcription factor binding to remaining regulatory elements after enhancer deletion.
  • Deletion of the homologous enhancer (CNS-18) in primary human Th9 cell cultures.
  • Assessment of IL-9 production and IL-9-dependent immune responses in both mouse models and human cell cultures.

Main Results:

  • An enhancer, termed Il9 CNS-25, was identified upstream of the Il9 gene, binding key transcription factors.
  • Deletion of Il9 CNS-25 in mice altered transcription factor binding to other regulatory elements.
  • Mice lacking the enhancer showed diminished IL-9 production in various cell types, including Th9 cells.
  • IL-9-dependent immune responses were attenuated in mice with the enhancer deletion.
  • Deletion of the homologous human enhancer (CNS-18) significantly decreased IL-9 production in human Th9 cells.

Conclusions:

  • Il9 CNS-25/IL9 CNS-18 is a critical cis-regulatory element for IL-9 production.
  • This regulatory element is conserved across species (mouse and human).
  • The identified enhancer plays a significant role in modulating IL-9-mediated immune responses.