Abstract
Structural alterations in 3q27 affecting the BCL6 locus are among the most frequent changes in B-NHL. The aim of the present study was to establish an interphase-FISH assay for the detection of all diverse BCL6 translocations in B-NHL. Two different approaches were tested, one using a PAC-clone spanning the major breakpoint region (MBR) of BCL6(span-assay), and another using two BAC clones flanking the MBR (flank-assay). Interphase FISH with the span-assay detected the various BCL6 translocations in seven B-NHL cell lines. The dual-color flank-assay was evaluated in two laboratories independently: in normal controls, the cutoff level for false-positive signals was 2.6%, whereas the cutoff level for false-negatives in the seven cell lines was 7.5%. To test the feasibility of the FISH strategies, 30 samples from patients with B-NHL with cytogenetic abnormalities of 3q27 were evaluated with both assays. In 21 cases, the span-assay indicated a BCL6 rearrangement. In 18 of the 21 cases, the dual-color flank-assay confirmed the translocation including 12 different partner chromosomal loci. The three false-positive cases detected with the span-assay showed trisomy of chromosome 3 by cytogenetic analyses, and they were correctly classified as non-rearranged with the flank-assay. In summary, our FISH strategy using two differently labeled flanking BCL6 BAC probes provides a robust, sensitive, and reproducible method for the detection of common and uncommon abnormalities of BCL6 gene in interphase nuclei. The routine application of this assay to patients with B-NHL will allow the assessment of the diagnostic and prognostic significance of BCL6 rearrangements.
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Acknowledgements
This work was supported by grants from the Fondo de Investigación Sanitaria FIS-98/0491 and BECE-99/6023, by the Generalitat Valenciana, Conselleria de Educacion y Ciencia POST-99/12–61, by the Deutsche Krebshilfe Grants 10–1556-Schl4 and 10–1641-De1, and by the IZKF Kiel. We thank Gianluca Gaidano (Torino, Italy), for the OCI-Ly8 cell line; Hitoshi Ohno (Kyoto, Japan), for the YM cell line; Wen-Lin Kuo and Joe Grey (University of California, San Francisco) for PACs RMC03P056 and RMC03P061; Mariano Rocci (Bari, Italy), for PACs 1019H10 and 1098H17; and M Ordoñez, E Cervello, R Marques, M Botia, A Schneider, F Kahlert, L Askari, C Becher, D Schuster and R Zühlke-Jenisch for excellent technical assistance.
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Sanchez-Izquierdo, D., Siebert, R., Harder, L. et al. Detection of translocations affecting the BCL6 locus in B cell non-Hodgkin's lymphoma by interphase fluorescence in situ hybridization. Leukemia 15, 1475–1484 (2001). https://doi.org/10.1038/sj.leu.2402207
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DOI: https://doi.org/10.1038/sj.leu.2402207
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