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trans-Activation of a globin promoter in nonerythroid cells.

Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland 20892.

ABSTRACT

We show that expression in fibroblasts of a single cDNA, encoding the erythroid DNA-binding protein Eryf1 (GF-1, NF-E1), very efficiently activates transcription of a chicken alpha-globin promoter, trans-Activation in these cells occurred when Eryf1 bound to a single site within a minimal globin promoter. In contrast, efficient activation in erythroid cells required multiple Eryf1 binding sites. Our results indicate that mechanisms exist that are capable of modulating the trans-acting capabilities of Eryf1 in a cell-specific manner, without affecting DNA binding. The response of the minimal globin promoter to Eryf1 in fibroblasts was at least as great as for optimal constructions in erythroid cells. Therefore, the assay provides a very simple and sensitive system with which to study gene activation by a tissue-specific factor.

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