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. 1991 Jul 25;19(14):3843–3848. doi: 10.1093/nar/19.14.3843

GATA-1 transactivates erythropoietin receptor gene, and erythropoietin receptor-mediated signals enhance GATA-1 gene expression.

T Chiba 1, Y Ikawa 1, K Todokoro 1
PMCID: PMC328472  PMID: 1650452

Abstract

Erythropoietin is a cytokine which specifically regulates the proliferation and differentiation of erythroid progenitor cells. The expression of erythropoietin receptor on the cell membrane of the progenitor cells is a critical event during the erythroid differentiation process. In order to clarify the tissue-specific and differentiation stage-specific expression of the erythropoietin receptor gene, its transcriptional regulation was examined by transient expression assay, gel mobility shift assay and DNase I footprinting. The results clearly showed that GATA-1 transactivates the gene expression through a single GATA motif located around -200 bp upstream from the ATG codon in a dose dependent manner. Furthermore, Northern blot analysis revealed that erythropoietin receptor-mediated signals strongly enhanced GATA-1 gene expression in accordance with the appearance of hemoglobin-positive cells. Taken together with other observations, these results suggested the following scheme of erythroid differentiation: 1)GATA-1 is expressed in the early stage of blood cell development; 2) GATA-1 transactivates the erythropoietin receptor gene; 3) erythropoietin binds its receptor and the receptor-mediated signals enhance GATA-1 gene expression in erythroid progenitor cells; and 4) GATA-1 finally transactivates hemoglobin synthesis-related genes and globin genes in relatively matured erythroid cells.

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Selected References

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