Abstract
DNA sequence analysis of PCR amplified Igh/c-myc junction fragments of T(12;15) chromosome translocations and immunohistochemical determination of immunoglobulin isotype production were employed to study the clonal diversification of neoplastic translocated plasma cells that resided in peritoneal inflammatory granulomas of BALB/c mice harboring primary plasmacytomas. The diversity of plasma cells was found to take two major forms when the fine structure of the T(12;15) translocation was used as the clonotypic marker. First, mosaics of clones containing translocations that were apparently unrelated to each other were detected in nine out of 17 (53%) mice. Second, subclones derived from common T(12;15)+ progenitors by either secondary deletions in translocation breakpoint regions or aberrant isotype switching near translocation breaksites were found in five of 17 (29.5%) mice. When Ig expression was utilized as the clonotypic marker, clonal mosaics were shown to occur in all mice. This was demonstrated by the finding that the prevalent IgA- or IgG-producing plasmacytoma clone was invariably accompanied by smaller clones of IgG- or IgA-expressing neoplastic plasma cells, respectively. These results provided new insights into the clonal diversification at the terminal stage of plasmacytomagenesis. In addition, they suggested that BALB/c plasmacytomas may be uniquely useful for studying clonal diversity during B cell oncogenesis, since clonal evolution can be evaluated in a pool of tumor and tumor precursor cells that is clearly defined by the T(12;15) chromosomal translocation and the production of monoclonal immunoglobulin.
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Acknowledgements
We thank Dr Michael Potter for supporting this work, sharing his expertise on the histogenesis of plasmacytoma development and making many additional helpful suggestions in the course of the experiments. We gratefully acknowledge the contributions of Wendy duBois to animal husbandry. We are grateful to Drs Lynne D Rockwood, Rebecca Liddell and J Frederic Mushinski for reading the manuscript and providing editorial assistance.
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Kovalchuk, A., Mushinski, E. & Janz, S. Clonal diversification of primary BALB/c plasmacytomas harboring T(12;15) chromosomal translocations. Leukemia 14, 909–921 (2000). https://doi.org/10.1038/sj.leu.2401676
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DOI: https://doi.org/10.1038/sj.leu.2401676