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. 1985 Oct;56(1):258–267. doi: 10.1128/jvi.56.1.258-267.1985

Concerted DNA rearrangements in Moloney murine leukemia virus-induced thymomas: a potential synergistic relationship in oncogenesis.

P N Tsichlis, P G Strauss, M A Lohse
PMCID: PMC252516  PMID: 2993654

Abstract

Rat thymic lymphomas induced by Moloney murine leukemia virus carry DNA rearrangements due to provirus integration in at least five independent cellular DNA domains (Mlvi-1, Mlvi-2, Mlvi-3, RMoInt-1, and c-myc). We had previously shown that rearrangements in more than one of these domains could occur in the same tumor. In this report we extend these findings by showing that, with one exception, tumors containing provirus insertions in Mlvi-1 always contained provirus insertions in a second locus, Mlvi-2. To determine whether both events occurred in the same population of tumor cells, we examined the clonal nature of these tumors by taking advantage of allelic polymorphisms that occur naturally in both Mlvi-1 and Mlvi-2. Tumors with provirus insertions in both Mlvi-1 and Mlvi-2 arising in rats heterozygous at one of these loci were identified. DNA from these tumors was analyzed by restriction endonuclease digestion and hybridization to DNA probes derived from both Mlvi-1 and Mlvi-2. Thus, we determined the clonal nature of three thymomas and showed that in these tumors both insertion events occurred in the same population of tumor cells. The concomitant appearance of provirus insertions in Mlvi-1 and Mlvi-2 suggests a synergism of these two events that may be important in tumor induction and progression.

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Selected References

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