Abstract
In Burkitt's lymphoma (BL) cells the proto-oncogene c-myc is juxtaposed to one of the immunoglobulin (Ig) loci on chromosomes 2, 14, or 22. The c-myc gene becomes transcriptionally activated as a consequence of the chromosomal translocation and shows preferential usage of promoter P1 over P2, a phenomenon referred to as promoter shift. In order to define the responsible regulatory elements within the Ig λ locus, we studied the effect of the human Ig λ enhancer (HuEλ) on c-myc expression after stable transfection into BL cells. A 12 kb genomic fragment encompassing HuEλ, but not HuEλ alone, strongly activated c-myc expression and induced the promoter shift. To identify additional elements involved in c-myc deregulation, we mapped DNaseI hypersensitive sites within the 12 kb λ fragment on the construct. Besides one hypersensitive site corresponding to HuEλ, three additional sites were detected. Two of these elements displayed enhancer activity after transient transfection. The third element did not activate c-myc transcription, but was required for full c-myc activation and promoter shift. Deletion analyses of the c-myc promoter identified the immediate promoter region as sufficient for activation by the Ig λ locus, but also revealed that induction of the promoter shift requires additional upstream elements.
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Acknowledgements
We like to thank Raji Jayaraman, Eric Nisbet-Brown and Kenneth Cooke for helpful comments. This work was supportet by Die Deutsche Forschungsgemeinschaft, PO325/1-3 and Fonds der Chemischen Industrie. Correspondence should be sent to Armin Gerbitz.
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Gerbitz, A., Mautner, J., Geltinger, C. et al. Deregulation of the proto-oncogene c-myc through t(8;22) translocation in Burkitt's lymphoma. Oncogene 18, 1745–1753 (1999). https://doi.org/10.1038/sj.onc.1202468
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DOI: https://doi.org/10.1038/sj.onc.1202468
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