Abstract
New polyomavirus mutants (PyEC-C) selected on LT1 cells and exhibiting a strong cytopathic effect in all embryonal carcinoma (EC) cell lines tested have been isolated. They were derived by a sequence duplication event from a new multiadapted mutant isolated in PCC4 cells. A quantitative analysis of viral DNA replication and transcription in 3T6 and EC cell lines was performed to compare PyEC-C mutants and PyEC mutants previously isolated on F9 or PCC4 cell lines. Analysis of the results indicated that PyEC-C mutants were more efficient in all EC cell lines tested than all other PyEC mutants; on the contrary, they were less adapted to 3T6 cells than wild-type polyomavirus. In both 3T6 and EC cells, uncoupling between early transcription and viral DNA replication was observed; different viruses were shown to replicate with the same efficiency, while their levels of early transcripts differed by two orders of magnitude. Attempts to correlate the genome structure of the mutants with their biological properties indicate that duplication of protein-binding sequences is not the only event responsible for their phenotype. PyEC mutants were also analyzed with respect to their interactions with early mouse embryos and embryonal stem (ES) cell lines derived from the inner cell mass of blastocysts. They showed different degrees of expression in ES cells and preimplantation embryos. ES cells were most efficiently infected and lysed by mutants which exhibit both a multiadapted and a lytic phenotype in EC cells. Preimplantation embryos were not permissive to any PyEC mutants. However, EC-multiadapted mutants were infectious in blastocysts after two days of in vitro culture.
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