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. 1990 Oct;9(10):3129–3136. doi: 10.1002/j.1460-2075.1990.tb07510.x

A 3' transcriptional enhancer regulates tissue-specific expression of the human CD2 gene.

R A Lake 1, D Wotton 1, M J Owen 1
PMCID: PMC552041  PMID: 2209539

Abstract

A strong lymphocyte-specific transcriptional enhancer was identified within a DNase I hypersensitive site at the 3' end of the human CD2 gene. Full activity, in a transient expression assay, was contained within a region of 550 bp (minimal enhancer). T cells which express CD2 could use the enhancer to activate transcription from the reporter gene chloramphenicol acetyltransferase in the context of a heterologous promoter. Lower levels of transcription were detected in non-CD2-expressing T cells and in B cells. In contrast, the enhancer did not function in the epithelial cell line HeLa or in Colo 320 HSR, a cell line of neuroendocrine origin. Low levels of enhancement were detectable from two core regions, which acted synergistically with other cis-acting sequences to generate the complete enhancer. DNase I footprinting studies identified six cis-acting sequences to which proteins bound. Five of these sequence motifs were novel; the sixth was a canonical cAMP response element. Topoisomerase II, and scaffold attachment region consensus sequences were also found within an A/T-rich area downstream of the minimal enhancer. Neither region was bound to the nuclear matrix. The CD2 enhancer is modular in structure, it is constructed of novel cis-acting sequences and it is a major component of the regulatory system that controls expression of the CD2 gene.

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