Elements in the First Intron of the Alpha 1(I) Collagen Gene Interact with Sp1 to Regulate Gene Expression
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Sequences within the first intron of the alpha 1(I) collagen gene act both positively and negatively to regulate expression of the gene. We have further characterized a 274 bp intronic sequence that contains an orientation-specific inhibitory activity and represents a constitutive DNase I-hypersensitive site in the gene. We show that this sequence contains two tandem, unique binding elements for the transcription factor Sp1. In addition, an Sp1-like site, capable of competing for protein binding to the intronic elements, resides in the distal promoter of the collagen gene. The results of experiments with site-directed mutations that abolish binding to the intronic elements indicate that these protein-DNA interactions have an inhibitory effect on the transcriptional efficiency of alpha 1(I) collagen-reporter gene constructs in transient transfection analysis. These data support our conclusion that the first intron plays a complex role, involving multiple protein-DNA binding interactions, in the regulation of expression of the alpha 1(I) collagen gene.
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