The oncogene Nup98-HOXA9 induces gene transcription in myeloid cells Journal Article
| Authors: | Ghannam, G.; Takeda, A.; Camarata, T.; Moore, M. A.; Viale, A.; Yaseen, N. R. |
| Article Title: | The oncogene Nup98-HOXA9 induces gene transcription in myeloid cells |
| Abstract: | The nucleoporin Nup98 gene is frequently rearranged in acute myelogenous leukemia (AML). In most cases this results in fusion of the N terminus of Nup98 to the DNA binding domain of a homeodomain transcription factor. The prototype of these fusions, Nup98-HOXA9, is associated with human AML and induces AML in mouse models. To understand the mechanisms by which Nup98-HOXA9 causes AML, we expressed it in myeloid cells and identified its target genes using high density oligonucleotide microarrays. The analysis was performed in triplicate and was confirmed by quantitative real time PCR. Of the 102 Nup98-HOXA9 target genes identified, 92 were up-regulated, and only 10 were down-regulated, suggesting a transcriptional activation function. A similar analysis of wild-type HOXA9 revealed 13 target genes, 12 of which were up-regulated, and 1 was down-regulated. In contrast, wild-type Nup98 had no effect on gene expression, demonstrating that the HOXA9 DNA binding domain is required for gene regulation. Co-transfection experiments using a luciferase reporter linked to the promoter of one of the Nup98-HOXA9 target genes confirmed up-regulation at the transcriptional level by Nup98-HOXA9 but not by either HOXA9 or Nup98. These data indicate that Nup98-HOXA9 is an aberrant transcription factor whose activity depends on the HOXA9 DNA binding domain but has a stronger and wider transcriptional effect than HOXA9. Several of the genes regulated by Nup98-HOXA9 are associated with increased cell proliferation and survival as well as drug metabolism, providing insights into the pathogenesis and epidemiology of Nup98-HOXA9-induced AML. |
| Keywords: | acute granulocytic leukemia; human cell; pathogenesis; flow cytometry; polymerase chain reaction; protein domain; cell proliferation; metabolism; animals; mice; gene; cell survival; gene targeting; cell cycle; cell division; genes; gene expression; models, biological; down-regulation; transcription factor; genetic transcription; homeodomain proteins; transcription, genetic; transfection; luminescent proteins; oncogene; blotting, western; gene expression regulation, neoplastic; dna; gene rearrangement; hybrid protein; amino terminal sequence; genetic transfection; reverse transcriptase polymerase chain reaction; oligonucleotide array sequence analysis; oncogene proteins, fusion; green fluorescent proteins; plasmids; protein structure, tertiary; genes, reporter; dna microarray; gene induction; bone marrow cell; up-regulation; epidemiology; image processing, computer-assisted; luciferases; biochemistry; retroviridae; nuclear pore complex proteins; myeloid cells; k562 cells; drug products; nucleoporin; activation analysis; trans-activation (genetics); leukemia, myelocytic, acute; humans; human; priority journal; article; hoxa9 gene; nup98 gene |
| Journal Title: | Journal of Biological Chemistry |
| Volume: | 279 |
| Issue: | 2 |
| ISSN: | 0021-9258 |
| Publisher: | American Society for Biochemistry and Molecular Biology |
| Date Published: | 2004-01-09 |
| Start Page: | 866 |
| End Page: | 875 |
| Language: | English |
| DOI: | 10.1074/jbc.M307280200 |
| PROVIDER: | scopus |
| PUBMED: | 14561764 |
| DOI/URL: | |
| Notes: | J. Biol. Chem. -- Cited By (since 1996):44 -- Export Date: 16 June 2014 -- CODEN: JBCHA -- Source: Scopus |
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