Abstract
Numerous studies have shown that the retroviral oncogene v-myb encodes a transcription factor (v-Myb) which interferes with the differentiation program of myelomonocytic cells. It is generally thought that v-Myb deregulates the expression of specific target genes and thereby causes transformation of these cells. By using an estrogen-inducible version of v-Myb we have previously identified the gene for the chicken A2B adenosine receptor (A2B-AR), a member of the seven-pass transmembrane receptor superfamily, as a bona fide target gene for v-Myb. The chicken A2B-AR gene is expressed in v-myb transformed myeloblasts as well as in c-myb expressing erythroblasts, offering the opportunity to study how Myb transcription factors activate a target gene in two different hematopoietic lineages. Here, we report the characterization of the promoter of the A2B-AR gene. We show that the A2B-AR promoter region contains an exceptionally large number of Myb binding sites, many of which contribute to the Myb-inducibility of the promoter. The same sites were required for promoter activity in myelomonocytic and erythroid cells. In contrast to the promoters of other Myb target genes the A2B-AR promoter was not activated synergistically by Myb and other lineage-specific transcription factors that have been identified as Myb cooperation partners before. Taken together, our data suggest that the activation of the A2B-AR promoter by Myb depends on the simultaneous binding of a large number of Myb molecules.
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Acknowledgements
We thank O Burk and S Worpenberg who performed the initial screening and characterization of genomic A2B-AR clones. This work was supported by grants from the DFG (GRK233/1−97 and SFB 291/A13) and the Fonds der chemischen Industrie.
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The accession number for the A2B-AR promoter sequence is AF508797.
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Kattmann, D., Klempnauer, KH. Identification and characterization of the Myb-inducible promoter of the chicken adenosine receptor 2B gene. Oncogene 21, 4663–4673 (2002). https://doi.org/10.1038/sj.onc.1205579
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DOI: https://doi.org/10.1038/sj.onc.1205579