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A conserved tissue-specific structure at a human T-cell receptor beta-chain core promoter
J P Halle1, P Haus-Seuffert, C Woltering
1Laboratorium für Molekulare Biologie-Genzentrum der Ludwig-Maximilians-Universität München, Munich, Germany.
Molecular and Cellular Biology
|August 1, 1997
Summary
The human T-cell receptor (TCR) beta gene promoter has a complex, tissue-specific structure. Transcription factors bind cooperatively to nonconsensus sites, potentiating T-cell-specific gene expression.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- T-cell receptor (TCR) beta-chain promoters were previously thought to be simple basal promoters.
- A single conserved cyclic AMP-responsive element was known to be present.
Purpose of the Study:
- To investigate the structure and function of the human TCR Vbeta 8.1 promoter.
- To identify transcription factors involved in TCR beta gene regulation.
- To understand the mechanisms of T-cell-specific gene expression.
Main Methods:
- Gel shift assays to identify protein-DNA interactions.
- Footprinting experiments to map binding sites.
- Reporter gene assays to assess transcriptional activation.
Main Results:
- The TCR Vbeta 8.1 promoter exhibits a complex, tissue-specific structure.
- Lymphoid cell-specific factors (Ets-1, LEF1, AML1) and CREB/ATF-1 bind to the core promoter.
- These factors cooperatively activate transcription through nonconsensus binding sites.
- Proximal upstream elements are activated by CREB/ATF and Sp1 factors.
- Similar promoter structures are observed in other T-cell-specific genes like CD4.
Conclusions:
- The TCR beta gene promoter has a complex, tissue-specific architecture.
- Cooperative binding of transcription factors to nonconsensus sites is crucial for T-cell-specific activation.
- This promoter structure is conserved in other T-cell-expressed genes.
- The interplay between promoter and enhancer elements potentiates T-cell-specific transcription.