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Mol Cell Biol. 1993 November; 13(11): 7056-7070

Identification and characterization of an Alu-containing, T-cell-specific enhancer located in the last intron of the human CD8 alpha gene.

J E Hambor, J Mennone, M E Coon, J H Hanke and P Kavathas

Department of Molecular Genetics and Protein Chemistry, Pfizer Central Research, Groton, Connecticut 06340.

ABSTRACT

Expression of the human CD8 alpha gene is restricted to cells of the lymphoid lineage and developmentally regulated during thymopoiesis. As an initial step towards understanding the molecular basis for tissue-specific expression of this gene, we surveyed the surrounding chromatin structure for potential cis-acting regulatory regions by DNase I hypersensitivity mapping and found four hypersensitive sites, three of which were T cell restricted. By using a reporter-based expression approach, a T-cell-specific enhancer was identified by its close association with a prominent T-cell-restricted hypersensitive sites in the last intron of the CD8 alpha gene. Deletion studies demonstrated that the minimal enhancer is adjacent to a negative regulatory element. DNA sequence analysis of the minimal enhancer revealed a striking cluster of consensus binding sites for Ets-1, TCF-1, CRE, GATA-3, LyF-1, and bHLH proteins which were verified by electrophoretic mobility shift assays. In addition, the 5' end of the enhancer was composed of an Alu repeat which contained the GATA-3, bHLH, and LyF-1 binding sites. Site-directed mutation of the Ets-1 and GATA-3 sites dramatically reduced enhancer activity. The functional importance of the other binding sites only became apparent when combinations of mutations were analyzed. Taken together, these results suggest that the human CD8 alpha gene is regulated by the interaction of multiple T-cell nuclear proteins with a transcriptional enhancer located in the last intron of the gene. Comparison of the CD8 alpha enhancer with other recently identified T-cell-specific regulatory elements suggests that a common set of transcription factors regulates several T-cell genes.

Mol Cell Biol. 1993 November; 13(11): 7056-7070




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