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The Invariant Chain Gene Intronic Enhancer Shows Homology to Class II Promoter Elements¹

Department of Biological Sciences, Stanford University, Stanford, CA 94305

Coordinate expression of MHC class II proteins and the class II-associated invariant chain (Ii) is important for proper MHC class II functioning in Ag processing and presentation. The coordinate regulation of these genes results, in part, from the sharing of transcriptional regulatory regions between MHC class II and Ii genes; the Ii has previously been shown to have an upstream enhancer closely related to the essential class II promoter elements. We report here the characterization of a second enhancer in the Ii gene, located within the first intron. This intronic enhancer is contained within a 155-bp region, enhances transcription from the Ii minimal promoter, and also contains elements that are homologous to class II promoter elements X1, X2, and Y boxes.

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