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. 1985 Jan;53(1):292–295. doi: 10.1128/jvi.53.1.292-295.1985

Integration of spleen focus-forming virus proviruses in Friend tumor cells.

F Moreau-Gachelin, J Robert-Lezenes, F Wendling, A Tavitian, P Tambourin
PMCID: PMC255034  PMID: 2981349

Abstract

Using the Southern blot procedure, we studied the presumed spleen focus-forming virus (SFFV) provirus integration sites in the genome of the premalignant and the malignant cells isolated during the course of Friend erythroleukemia. Two restriction endonucleases, PstI and BamHI, discriminated the presumed integrated SFFV proviruses from the endogenous xenotropic-mink cell focus-forming viral sequences. No SFFV integration sites were detectable in the premalignant cells, suggesting a random integration of SFFV proviruses in the genome of these cells. In contrast, SFFV proviruses were detected at a single or very few sites in the genome of all malignant cells we analyzed. These results indicate that the event leading to the malignant transformation in acute Friend leukemia is clonal. In two of the six animals examined, tumors cells isolated from the spleens and the livers of individual mice showed identical SFFV integration patterns. This last result suggests that in some cases different tumors in a same leukemic animal could be derived from a unique clonal event.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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