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The transcription of the human tenacin-C (TN-C) gene is directed by a single promoter. Here we demonstrate, in transiently transfected cells, that two distinct regions of the untranslated 179 bp-long exon 1 play antagonistic roles in transcriptional regulation: bases from 1 to 20 strongly increase the transcription of the reporter gene CAT directed by the human TN-C gene promoter, while bases from...
Ras, a GTP-binding protein, converts membrane tyrosine kinase signalling to changes in gene expression patterns. Utilising a rat glucagon promoter-CAT construct (p[-1.1]GLU-CAT) we demonstrate in transient transfection experiments that the oncogenic Ras inhibits cAMP-dependent activation of p[-1.1]GLU-CAT in both glucagonoma InR1-G9 and insulinoma β-TC1 cells. Conversely, the expression of a dominant...
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