Abstract
We have performed a detailed analysis of the cis-acting sequences involved in the erythroid-specific expression of the human glycophorin B (GPB) promoter and found that this promoter could be divided into two regions. The proximal region, -1 to -60, contains a GATA binding sequence around -37 and an SP1 binding sequence around -50. This region is active in erythroid and non-erythroid cells. The distal region, -60 to -95, contains two overlapping protein binding sites around -75, one for hGATA-1 and one for ubiquitous proteins. This distal region completely represses the activity of the proximal promoter in non-erythroid cells and defines the -95 GPB construct as a GPB promoter that displays erythroid specificity. Using site directed mutagenesis, we show that the -37 GATA and the -50 SP1 binding sites are necessary for efficient activity of the -95 GPB construct. Mutations that impair the -75 GATA-1 binding result in extinction of the -95 GPB construct activity if the -75 ubiquitous binding site is not altered, or in loss of erythroid specificity if the -75 ubiquitous binding site is also mutated. Using a cotransfection assay, we found that hGATA-1 can efficiently activate transcription of the -95 GPB construct in non-erythroid cells. This transactivation is abolished by mutations that impair either the -37 GATA-1 or the -50 SP1 binding. Mutations that impair the -75 GATA-1 binding and still allow the -75 ubiquitous binding also abolish the transactivation of the -95 GPB construct, indicating that hGATA-1 can remove repression of the GPB promoter by displacement of the ubiquitous proteins.(ABSTRACT TRUNCATED AT 250 WORDS)
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Selected References
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