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. 1982 Sep;43(3):1072–1081. doi: 10.1128/jvi.43.3.1072-1081.1982

Polyoma virus mutant with normal transforming ability but impaired tumorigenic potential.

C Gelinas, P Chartrand, M Bastin
PMCID: PMC256219  PMID: 6292450

Abstract

Cloned DNA from the P155 mutant of polyoma virus transforms cells in culture as efficiently as wild-type DNA, but has a much lower tumorigenic potential when injected into newborn rats. Like cells transformed by wild-type DNA, cells transformed by the mutant DNA grow in low serum concentrations, form colonies in agar suspension, and grow to high saturation densities compared with untransformed cells. They are, however, much less tumorigenic since they transplant 100- to 2,000-fold less efficiently than cells transformed by wild-type DNA. Substitution of the region between 89.7 and 1.8 map units by the corresponding region of P155 DNA decreased the tumorigenicity of wild-type DNA. When this region was isolated from wild-type DNA and substituted in P155 DNA, the tumorigenicity of the latter increased to values comparable to those of wild-type DNA. This showed that the lesion affecting tumorigenicity occurred between 89.7 and 1.8 map units on the polyoma virus genome. Sequence analysis in this region revealed a 12-base-pair deletion between nucleotides 1,347 and 1,360. This identified P155 as an mlt mutant, i.e., a mutant with a deletion from a region which encodes parts of the large and middle T antigens.

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