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Acute Non-Lymphocytic Leukemias

The GATA site-dependent hemogen promoter is transcriptionally regulated by GATA1 in hematopoietic and leukemia cells

Abstract

Hemgn (a gene symbol for hemogen in mouse, EDAG in human and RP59 in rat) encodes a nuclear protein that is highly expressed in hematopoietic tissues and acute leukemia. To characterize its regulatory mechanisms, we examined the activities of a Hemgn promoter containing 2975 bp of 5′ flanking sequence and 196 bp of 5′ untranslated region (5′ UTR) sequence both in vitro and in vivo: this promoter is preferentially activated in a hematopoietic cell line, not in nonhematopoietic cell lines, and is sufficient to drive the transcription of a lacZ transgene in hematopoietic tissues in transgenic mice. Mutagenesis analyses showed that the 5′ UTR including two highly conserved GATA boxes is critical for the promoter activity. GATA1, not GATA2, binds to the GATA binding sites and transactivates the Hemgn promoter in a dose-dependent manner. Furthermore, the expression of human hemogen (EDAG) transcripts were closely correlated with levels of GATA1 transcripts in primary acute myeloid leukemia specimens. This study suggests that the Hemgn promoter contains critical regulatory elements for its transcription in hematopoietic tissues and Hemgn is a direct target of GATA1 in leukemia cells.

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Acknowledgements

We appreciate the access to microscopes in Dr Richard Vander Heide's laboratory and the Imaging Core Facilities of Karmanos Cancer Institute at Wayne State University. We thank Dr Giuseppe Rossi and Scott Goustin for helpful discussions. This work was supported by a grant from the Children's Research Center of Michigan (to L Li), the seed grant from the department of Internal Medicine at Wayne State University (to L Li), NHLBI/NIH HL58916 (to L Li), NCI Grant RO1 CA92308 (to JW Taub), NCI Grant RO1 CA76641 (to L Matherly), the Leukemia and Lymphoma Society (to JW Taub), and the Children's Research Center of Michigan (to Y Ge).

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Correspondence to L Li.

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Supplementary Information is available on the Leukemia website (http://www.nature.com/leu/)

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Yang, L., Wan, J., Ge, Y. et al. The GATA site-dependent hemogen promoter is transcriptionally regulated by GATA1 in hematopoietic and leukemia cells. Leukemia 20, 417–425 (2006). https://doi.org/10.1038/sj.leu.2404105

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