Abstract
In this study, CA46 and ST486, two Epstein–Barr (EBV) negative cell lines derived from sporadic BL, were analyzed by multicolor spectral karyotyping, G-banding, fluorescence in situ hybridization with single-copy gene probes, and comparative genomic hybridization (CGH). In addition to reciprocal t(8;14)(q24;q32) translocation involving c-myc and IgH loci, we identified a t(7;8;14)(q11.2;q24;q32) translocation in CA 46 cells and t(8;14;18)(q24;q32;q23) in ST486 cells. Both rearrangements were not previously described in BL and resulted in transposition of myc sequences in a new genomic configuration. Several DNA imbalances mapped by CGH at the same sites in both lines, may reflect recurrent genomic changes that are relevant to pathogenesis of BL. We tested the tumorigenicity of these lines by injecting cells intraperitoneally in SCID mice. In two separate experiments, CA46 cells produced tumors 2 weeks after cell inoculation while ST486 cells induced only one tumor after a long latency period. Partial duplication of the long arm of chromosome 1 involving variable bands but always band 1q23 is the second most common alteration in BL and is known to be associated with aggressive tumors and poor prognosis. Duplication of the bands 1q23–24 commonly observed in EBV-negative lines was identified only in highly tumorigenic CA46 cells suggesting that this region harbor gene(s) associated with tumor cell invasiveness.
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Acknowledgements
We thank Dr Douglas Kingma from the Laboratory of Pathology, National Cancer Institute, Bethesda, Maryland, for histological diagnosis of the tumors.
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Zimonjic, D., Keck-Waggoner, C. & Popescu, N. Novel genomic imbalances and chromosome translocations involving c-myc gene in Burkitt's lymphoma. Leukemia 15, 1582–1588 (2001). https://doi.org/10.1038/sj.leu.2402281
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DOI: https://doi.org/10.1038/sj.leu.2402281
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