Abstract
Tumor cell metaphases of classical Hodgkin's lymphoma (cHL) characteristically display highly rearranged karyotypes with chromosome numbers in the hyperploid range and marked intraclonal variability. The causes of this cytogenetic pattern remain largely unknown. An unusual type of chromosomal abnormality coined as segmental chromosomal aberration (SCA) has been recurrently observed in HL cell lines and was suggested to be associated with ribosomal DNA (rDNA) rearrangements. Moreover, centrosome abnormalities provoking deficient chromosome segregation have been reported in many solid tumors and also in cHL cell lines. Whether SCA, rDNA rearrangements or centrosome abnormalities also occur in primary cHL is not yet known. Thus, we performed extensive molecular cytogenetic and immunohistological studies in two cHL cases. Both cases presented SCA associated with genomic gains of the REL and JAK2 loci, respectively. The SCA involving JAK2 was associated with rDNA rearrangements. The absolute centrosome size of HRS cells in both cases was significantly larger than in non-HRS cells, but the relative centrosome size of HRS cells corrected for nuclear size was in the same range as that of the non-neoplastic cells. These findings demonstrate that the various mechanisms associated with chromosomal instability warrant a more detailed characterization in cHL.
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Acknowledgements
This article is dedicated to Professor Dr Werner Grote, Director of the Institute of Human Genetics of the University Hospital Schleswig-Holstein (Campus Kiel), on the occasion of his 65th birthday. We thank Dorit Schuster and Claudia Becher for their excellent technical assistance and Dr Jochen Heukeshoven for peptide synthesis. Clones for rDNA sequences and the centromere of chromosome 20 were kindly provided by Dr Mariano Rocchi from the University of Bari (Italy, http://www.biologia.uniba.it/rmc).
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Martín-Subero, J., Knippschild, U., Harder, L. et al. Segmental chromosomal aberrations and centrosome amplifications: pathogenetic mechanisms in Hodgkin and Reed–Sternberg cells of classical Hodgkin's lymphoma?. Leukemia 17, 2214–2219 (2003). https://doi.org/10.1038/sj.leu.2403129
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DOI: https://doi.org/10.1038/sj.leu.2403129
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