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Phenotypic transformation of the host cell affected the formation of polyoma pseuodovirions. Polyoma virus infection of various transformed derivatives of mouse 3T3 cells resulted in the formation of predominantly pseudovirions, whereas infection of mouse 3T3 cells produced mainly polyoma virus. The effect that transformation of the host cell had on polyoma pseudovirus formation was further demonstrated by using phenotypic revertants isolated from some of the transformed cell lines. The revertants were characterized by their morphology, saturation densities, and colony-forming ability in methylcellulose suspension. By these criteria they were distinct from their transformed parents and similar to 3T3 cells. After infection, the revertants produced predominantly polyoma virus and few pseudovirus. Thus, for the cell lines used in this study, phenotypic transformation enhanced the formationof polyoma pseudovirions.

Phenotypic transformation of the host cell enhances polyoma pseudovirion formation