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Joos, S. ; Falk, M.H. ; Lichtner, P.* ; Haluska, F.G.* ; Henglein, B.* ; Lenoir, G.M.* ; Bornkamm, G.W.

Variable breakpoints in Burkitt lymphoma cells with chromosomal t(8;14) translocation separate c-myc and the IgH locus up to several hundred kb.

Hum. Mol. Genet. 1, 625-632 (1992)
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In about 80% of Burkitt's lymphoma cases, the tumour cell harbours a reciprocal chromosomal translocation which invariably transposes the coding exons 2 and 3 of c-myc from chromosome 8 to the immunoglobulin heavy chain locus on chromosome 14. Those t(8;14) translocations which disrupt chromosome 8 within or close to the c-myc gene are well documented. In this study we have focussed on t(8;14) translocations with the chromosomal breakpoint far upstream of c-myc. We analyzed the breakpoint position in 44 BL cell lines with t(8;14) translocations of different geographical origin and identified 9 cell lines with the breakpoint more than 14 kb upstream of c-myc. In these cell lines the positions of the translocation junctions on the derivative chromosomes 8q- and 14q+ were mapped by pulsed field gel electrophoresis and multicolour fluorescence in situ hybridization. The breakpoints occur at distances between 55 and more than 340 kb upstream of c-myc with no preferential site on chromosome 8. On chromosome 14, however, the translocation breakpoints are clustered in a narrow region 5′ of the intron enhancer of the immunoglobulin heavy chain gene. In 7 of 9 cases, the enhancer is fused to the c-myc bearing sequences of chromosome 8. In two cases, the translocation has occurred in switch μ and downstream of Cμ, respectively. The impact of these results with respect to the hypothesis, that cisregulatory sequences from the immunoglobulin heavy chain locus can deregulate c-myc expression in a manner sufficient for tumour formation, is discussed.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
ISSN (print) / ISBN 0964-6906
e-ISSN 1460-2083
Quellenangaben Band: 1, Heft: 8, Seiten: 625-632 Artikelnummer: , Supplement: ,
Verlag Oxford University Press
Begutachtungsstatus Peer reviewed