A Gata3 enhancer necessary for ILC2 development and function

Area of Science:

• Immunology
• Molecular Biology
• Genetics

Background:

• The type 2 helper effector program is regulated by the transcription factor GATA3.
• Both innate lymphoid cells (ILCs) and adaptive CD4+ T helper (Th) cells express this program.
• The distinct regulatory mechanisms governing this common program are not fully understood.

Purpose of the Study:

• To investigate the regulatory mechanisms controlling GATA3 expression and type 2 helper cell differentiation in ILCs and Th2 cells.
• To identify specific genetic elements that differentially regulate GATA3 in innate versus adaptive type 2 helper cells.

Main Methods:

• Utilized a mouse model lacking the *Gata3* +674/762 enhancer.
• Assessed type 2 inflammatory responses in knockout mice.
• Analyzed the differentiation and GATA3 expression levels in ILC2s and Th2 cells.

Main Results:

• The *Gata3* +674/762 enhancer is crucial for ILC2 differentiation and high GATA3 expression.
• This enhancer plays a minimal role in Th2 cell differentiation.
• Mice lacking the enhancer showed impaired, but not abolished, type 2 inflammatory responses, with varying impact based on ILC2 and Th2 cell contribution.

Conclusions:

• The *Gata3* +674/762 enhancer differentially regulates GATA3-driven type 2 effector programs in innate and adaptive lymphocytes.
• This study provides molecular insights into the distinct gene regulatory pathways governing type 2 immunity in ILCs and Th cells.