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. 1994 Feb 25;22(4):669–677. doi: 10.1093/nar/22.4.669

Sp1 is essential for both enhancer-mediated and basal activation of the TATA-less human adenosine deaminase promoter.

M R Dusing 1, D A Wiginton 1
PMCID: PMC307859  PMID: 8127716

Abstract

Tissue-specific expression of the human adenosine deaminase (ADA) gene is mediated by transcriptional activation over a thousand-fold range. Cis-regulatory regions responsible for high and basal levels of activation include an enhancer and the proximal promoter region. While analyses of the T-cell specific enhancer have been carried out, detailed studies of the the promoter region or promoter-enhancer interactions have not. Examination of the promoter region by homology searches revealed six putative Sp1 binding sites. DNase I footprinting showed that Sp1 is able to bind these sites. Deletion analysis indicated that the proximal Sp1 site is required for activation of a reporter gene to detectable levels and that the more distal Sp1 sites further activate the level of expression. Inclusion of an ADA enhancer-containing fragment in these deletion constructions demonstrated that Sp1 sites are also essential for enhancer function. Apparently Sp1 controls not only low level expression but is also an integral part of the mechanism by which the enhancer achieves high level ADA expression. Mutagenesis of a potential TBP binding site at base pairs -21 to -26 decreased activity only two-fold indicating that it is not essential for transcriptional activation or enhancement.

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Selected References

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