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The T1 gene is a murine, delayed early serum-responsive gene that encodes glycoproteins of the interleukin-1 receptor (IL-1R) family. Transcription of the T1 gene leads to production of two mRNAs that encode a transmembrane protein, which is highly similar to the type-1 IL-1R, and a secreted protein, which consists solely of the extracellular part. Fibroblasts, in contrast to mast cells, express predominantly the shorter form of the protein, and several mitogens cause strong, transient induction of the T1 gene in these cells. Here we describe the identification of a 148 bp enhancer element that is positioned 3.6 kb upstream of the transcription initiation site. A TPA-responsive element (TRE) and three identical E-boxes are located within this sequence. Introduced point mutations confirmed the necessity of these sites for full T1 promoter activity. The TRE and the distal E-box are absolutely indispensable for promoter function, whereas the two proximal E-boxes contribute less to promoter strength. In vitro the three E-boxes are bound by different protein complexes.

Cooperative Interactions of AP-1 and Basic Helix-Loop-Helix Transcription Factors Regulate T1 Gene Expression