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Costa, Robert H.; Lai, Eseng; Grayson, Dennis R.; Darnell, James E.
Molecular and cellular biology, 19/1/1/, Letnik: 8, Številka: 1Journal Article
We previously defined two distinct cell-specific DNA elements controlling the transient expression of the transthyretin gene in Hep G2 (human hepatoma) cells: a proximal promoter region (-202 base pairs bp to the cap site), and a far-upstream cell-specific enhancer located between 1.6 and 2.15 kilobases (kb) 5′ of the cap site (R. H. Costa, E. Lai, and J. E. Darnell, Jr., Mol. Cell. Biol. 6:4697-4708, 1986). In this report, we located the effective transthyretin enhancer element within a 100-bp region between 1.96 and 1.86 kb 5′ to the mRNA cap site. In Hep G2 nuclear extracts, three protein-binding sites within this minimal enhancer element were identified by gel mobility and methylation protection experiments. Each binding site was required for full enhancer activity in Hep G2 transient expression assays. Competition experiments in protein-binding assays suggested that two of the three sites were recognized by a similar factor and that the protein interaction with the third site was different. The nuclear protein(s) which bound to the two homologous sites was found mainly or only in cells of hepatic origin, suggesting an involvement of this region in the cell-specific function of this enhancer. The nuclear protein(s) recognizing the third enhancer region was also found in HeLa and spleen cells.
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