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. 1991 Oct;65(10):5174–5183. doi: 10.1128/jvi.65.10.5174-5183.1991

The polyomavirus early region gene in transgenic mice causes vascular and bone tumors.

R Wang 1, V L Bautch 1
PMCID: PMC248994  PMID: 1654437

Abstract

Transgenic mice carrying the entire polyomavirus (Py) early region consistently develop both vascular and bone tumors. This tumor spectrum represents a subset of the tumors found in mice infected with Py and an expansion of the vascular tumor spectrum seen in Py middle T antigen (MT) transgenic mice (V. L. Bautch, S. Toda, J. A. Hassell, and D. Hanahan, Cell 51:529-538, 1987). Transgenic mice of three independent lineages develop these pathologies, and mice of individual lineages also develop lymphangiomas and fibrosarcomas. All tumors are of mesenchymal origin, and all tumor tissues express the Py transgene. Some unaffected tissues, including the testes of mice of all lineages, also express the Py transgene. The number of transgene expression sites in mice of a given lineage correlates with the severity and latency of the tumor phenotype in these animals. Analysis of transgene transcripts indicates that RNAs for Py large T antigen (LT), MT, and small T antigen (ST) are present in both tumors and testes of transgenic mice. The ratio of LT RNA to MT and ST RNAs, however, is higher in testes than in tumors and other unaffected tissues, indicating that tissue-specific differences in the relative amounts of the alternatively spliced Py RNAs exist. The finding that some sites of Py transgene expression are susceptible to tumor formation while other expressing tissues such as testes are refractory to tumorigenesis suggests that mechanisms of viral pathogenesis are influenced by a tissue specificity in the effects of the Py early region.

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Selected References

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