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. 1989 Sep;86(17):6714–6718. doi: 10.1073/pnas.86.17.6714

A T-cell-specific transcriptional enhancer element 3' of C alpha in the human T-cell receptor alpha locus.

I C Ho 1, L H Yang 1, G Morle 1, J M Leiden 1
PMCID: PMC297916  PMID: 2788889

Abstract

A transcriptional enhancer element has been identified 4.5 kilobases 3' of C alpha (constant region alpha chain) in the human T-cell receptor (TCR) alpha-chain locus. This enhancer is active on both a TCR V alpha (variable region alpha chain) promoter and the minimal simian virus 40 promotor in TCR alpha/beta Jurkat and EL4 cells but is inactive on a V alpha promoter in human TCR gamma/delta PEER and Molt-13 cells, clone 13 B cells, and HeLa fibroblasts. The enhancer has been localized to a 116-base-pair BstXI/Dra I restriction enzyme fragment, which lacks immunoglobulin octamer and kappa B enhancer motifs but does contain a consensus cAMP-response element (CRE). DNase I footprint analyses demonstrated that the minimal enhancer contains two binding sites for Jurkat nuclear proteins. One of these sites corresponds to the CRE, while the other does not correspond to a known transcriptional enhancer motif. These data support a model in which TCR alpha gene transcription is regulated by a unique set of cis-acting sequences and trans-acting factors, which are differentially active in cells of the TCR alpha/beta lineage. In addition, the TCR alpha enhancer may play a role in activating oncogene expression in T-lymphoblastoid tumors that have previously been shown to display chromosomal translocations into the human TCR alpha locus.

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