Modulation of basal expression of the human α1(I) procollagen gene (COL1A1) by tandem NF-1/Sp1 promoter elements in normal human dermal fibroblasts

Carol M. Artlett, Shu Jen Chen, John Varga, Sergio A. Jimenez

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

We previously demonstrated that a segment of the human α1 type I procollagen gene (COL1A1) promoter encompassing nt -174 to -84 is responsible for the highest transcriptional activity in collagen producing cells in vitro. Here, we identified two almost identical tandem NF-1/Sp1 binding sites located between nt -129 to -107 (distal element) and nt -104 to -77 (proximal element) that are responsible for the basal regulation of COL1A1 transcription in normal human dermal fibroblasts. Transient transfection studies revealed that 85% of the basal COL1A1 promoter activity resides within the distal element; however, site-directed mutagenesis within the CCAAT motif in the proximal element resulted in a 98% decrease of the COL1A1 promoter activity. We conclude that each of the NF-1/Sp1 tandem binding sites has a different function. The distal element drives the transcriptional activity of the COL1A1 promoter but is not sufficient for its basal expression, whereas the NF-1 binding site in the proximal element is essential for in vitro COL1A1 gene transcription.

Original languageEnglish (US)
Pages (from-to)425-434
Number of pages10
JournalMatrix Biology
Volume17
Issue number6
DOIs
StatePublished - Oct 1998

All Science Journal Classification (ASJC) codes

  • Molecular Biology

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