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Volume 272, Number 36, Issue of September 5, 1997 pp. 22788-22799
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.

Silencer Activity in the Interferon-A Gene Promoters

(Received for publication, January 9, 1997, and in revised form, June 19, 1997)

Sébastien Lopez , Raymond Reeves ^§ , Marie-Laure Island , Marie-Thérèse Bandu , Nicolas Christeff , Janine Doly and Sébastien Navarro

From the  Laboratoire de Régulation de l'Expression des Gènes Eucaryotes, CNRS, UPR 37, UFR Biomédicale des Saints-Pères, Université René Descartes, 45 Rue des Saints-Pères, 75270 Paris Cedex 06, France and the ^§ Department of Biochemistry/Biophysics, Washington State University, Pullman, Washington 99164

Interferon-A (IFN-A) differential gene expression is modulated by a complex interplay between cis-acting DNA elements and the corresponding specific trans-regulating factors. Substitutions in the proximal virus-responsive element of the interferon-A (IFN-A) promoters contribute to their differential gene expression. The 5 distal silencing region in the weakly virus-inducible murine IFN-A11 gene has been previously delimited. DNase I footprinting experiments and transient gene expression assays demonstrate identical silencing activity in equivalent regions of the genes for IFN-A11 and IFN-A4 promoters. A minimal 20-mer distal negative regulatory element (DNRE) in both promoters is necessary and sufficient for the silencing and a region in the highly inducible IFN-A4 promoter located between the silencer and the virus-responsive element overrides the silencer activity. Mutations in the central region of the DNRE, causing derepression, also altered the formation of one of the two major DNA-protein complexes. One of these contains a protein related to or identical to the high mobility group I(Y) proteins, while the other complex contains a major protein present in uninduced and virus-induced cells with a molecular mass of 38 kDa, which may be related to the silencer activity. Similar DNREs are present in other virus-uninducible IFN-A promoters, and these data suggest that a common silencer may mediate the transcriptional repression in different genes of this family.

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