Related Experiment Videos
GATA-3-dependent enhancer activity in IL-4 gene regulation
S Ranganath1, W Ouyang, D Bhattarcharya
1Department of Pathology and Center for Immunology, Howard Hughes Medical Institute, Washington University School of Medicine, St. Louis, MO 63110, USA.
Journal of Immunology (Baltimore, Md. : 1950)
|October 21, 1998
Summary
The transcription factor GATA-3 partially enhances Interleukin-4 (IL-4) production in T helper 2 (Th2) cells. Full IL-4 gene expression requires additional regulatory elements beyond the proximal promoter and GATA-3 binding sites.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- The proximal promoter of Interleukin-4 (IL-4) directs some T helper 2 (Th2)-specific expression.
- This region shows low reporter mRNA levels compared to endogenous IL-4, indicating a need for additional regulatory elements.
Purpose of the Study:
- To identify and analyze enhancer elements within large genomic regions of IL-4.
- To investigate the interaction of these regions with transcription factors, particularly GATA-3.
Main Methods:
- Analysis of large genomic IL-4 regions for enhancer activity.
- Assessment of GATA-3 augmentation of promoter transactivation.
- Investigation of Th2-specific complex binding to GATA sites.
- Retroviral transduction of GATA-3 into developing T cells.
Main Results:
- Certain genomic regions significantly enhanced GATA-3 promoter transactivation.
- Some enhancing regions contained consensus GATA sites that bound Th2-specific complexes.
- GATA-3 transduction restored IL-5 to full Th2 levels but only partially restored IL-4 production.
Conclusions:
- GATA-3 is permissive but not sufficient for full IL-4 enhancement.
- Additional regulatory elements and GATA elements surrounding the IL-13/IL-4 gene locus are crucial for IL-4 expression.