Abstract
Human and rat cells transfected with UV-irradiated linear double-stranded DNA from calf thymus displayed a mutator activity. This phenotype was identified by growing a lytic thermosensitive single-stranded DNA virus (parvovirus H-1) in those cells and determining viral reversion frequencies. Likewise, exogenous UV-irradiated closed circular DNAs, either double-stranded (simian virus 40) or single-stranded (phi X174), enhanced the ability of recipient cells to mutate parvovirus H-1. The magnitude of mutator activity expression increased along with the number of UV lesions present in the inoculated DNA up to a saturation level. Unirradiated DNA displayed little inducing capacity, irrespective of whether it was single or double stranded. Deprivation of a functional replication origin did not impede UV-irradiated simian virus 40 DNA from providing rat and human cells with a mutator function. Our data suggest that in mammalian cells a trans-acting mutagenic signal might be generated from UV-irradiated DNA without the necessity for damaged DNA to replicate.
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Selected References
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