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. 1987 Jul;61(7):2232–2239. doi: 10.1128/jvi.61.7.2232-2239.1987

Polyomavirus tumor induction in mice: influences of viral coding and noncoding sequences on tumor profiles.

R Freund, G Mandel, G G Carmichael, J P Barncastle, C J Dawe, T L Benjamin
PMCID: PMC283687  PMID: 3035223

Abstract

We determined the DNA sequences of the noncoding regions of two polyomavirus strains that differ profoundly in their abilities to induce tumors in mice. Differences between strains were found, both on the late side of the replication origin in the region containing known enhancer elements and on the early side of the origin, affecting the number and location of large-T-antigen-binding sites. By constructing and analyzing recombinant viruses between these high- and low-tumor strains, we attempted to localize determinants which affect the frequency and histotype of tumors. Seven recombinants were constructed and propagated in vitro, and the tumor profile of each was established by inoculation into newborn C3H mice. Recombinants containing noncoding sequences from the high-tumor strain and coding sequences from the low-tumor strain behaved like the latter, inducing tumors at a low frequency and strictly of mesenchymal origin. Reciprocal recombinants with noncoding sequences of the low-tumor strain linked to structural determinants from the high-tumor strain induced several types of epithelial tumors typical of the high-tumor strain but at reduced frequency, in addition to mesenchymal tumors. A high frequency and full diversity of epithelial tumors required, in addition to structural regions from the high-tumor strain, noncoding sequences on the early side of the origin also present in this strain. A high-tumor profile thus resulted from the combined effects of structural and regulatory determinants in the high-tumor strain, with the former affecting primarily the tissue tropism and the latter affecting the frequency of tumors. No differential effects of the enhancer regions from the late side of the origin in the two virus strains were seen in this study.

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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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