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. 1992 Aug 11;20(15):3865–3872. doi: 10.1093/nar/20.15.3865

Transcriptional induction of IFN-gamma-responsive genes is modulated by DNA surrounding the interferon stimulation response element.

I Strehlow 1, T Decker 1
PMCID: PMC334060  PMID: 1508672

Abstract

The 9/27 and GBP mRNAs are both inducible by Interferon-gamma (IFN-gamma). The promoters of both genes contain an Interferon Stimulation Response Element (ISRE), but while the GBP gene is strongly induced transcriptionally by IFN-gamma the response of the 9/27 promoter is very weak. We investigated the molecular basis for this difference. The different IFN-gamma-responsiveness was found to have more than one reason. First, 9/27 promoter DNA was unable to bind the Gamma Interferon Activation Factor (GAF) with a single high affinity site. It efficiently competed for the association of the GAF with the GBP promoter but this competition was due to the presence of two low affinity sites, the ISRE and an ISRE-like sequence, suggesting that the GAS and ISRE, though both having clear preferences for specific proteins, may nevertheless share a certain degree of structural homology. Second, the 9/27 and GBP ISREs differed markedly in their affinities for regulatory proteins (ISGFs 1,2,3) and the GBP ISRE was more potent in mediating IFN-gamma-induced promoter activity in transient transfection. Third and most importantly, however, the strong difference between the IFN-gamma response of the two promoters was mainly due to the sequences surrounding the ISRE: the positive-acting GAS on one side and sequences with silencing properties 5' and 3' of the 9/27 ISRE on the other side. The data thus show mechanisms to both up- and down-regulate the activity of the ISRE.

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