Summary
Mouse plasmacytomas (MPC) carry one of three reciprocal translocations that juxtapose c-myc to one of the three Immunoglobulin (Ig) loci. Here we describe an exceptional MPC, induced by pristane oil and Abelson (A-MuLV) virus. It does not carry any of the three c-myc/Ig translocations, but contains a previously unknown reciprocal T(6;12) translocation affecting the bands known to carry the IgK (6C/1) and N-myc (12B) loci, respectively. Northern blot analysis showed high N-myc but no c-myc expression. This is consistent with the constitutive activation of N-myc by a juxtaposition of the IgK and N-myc loci. Reciprocal translocation in B-cell derived tumors are believed to involve the Ig loci by the action of some enzyme that participates in the physiological rearrangement of the Ig loci. Only transcriptionally active chromatin regions are accessible to such recombinases (Alt et al. 1987). N-myc is not expressed in B-cells, but it is transcriptionally active during the early pro- and pre-B cell stage, whereafter it and the surrounding chromatin region becomes inactive (Smith et al. 1992). It is therefore most likely that the N-myc/Kappa translocation has arisen at an early stage of B-cell differentiation. This would imply that the myc/Ig translocations do not block B-cell differentiation. They also reaffirm the functional equivalence of N- and c-myc in relation to B-cell carcinogenesis, as shown by our previous work on tumor induction in N-myc transgenic mice (Wang et al. 1992).
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Silva, S., Wang, Y., Babonits, M., Axelson, H., Wiener, F., Klein, G. (1992). An Exceptional Mouse Plasmacytoma with a New Kappa/N-myc [T(6; 12) (C1; B)] Translocation Expresses N-myc But Not c-myc. In: Potter, M., Melchers, F. (eds) Mechanisms in B-Cell Neoplasia 1992. Current Topics in Microbiology and Immunology, vol 182. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-77633-5_31
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DOI: https://doi.org/10.1007/978-3-642-77633-5_31
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