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A nonsense mutation (UAG) in the thymidine kinase gene of herpes simplex virus type 1 can be suppressed in vivo to produce active thymidine kinase by prior infection with a defective simian virus 40 stock which acts as a vector to introduce a functional suppressor tRNA gene into mammalian cells in culture. The suppression is specific for UAG, but not UGA or missense, mutants and restores thymidine kinase activity to 20 to 40% of the wild-type level. These results suggest that many cell lines susceptible to simian virus 40 infection may be transiently converted to a suppressor-positive phenotype for use in the genetic study of mammalian viruses.

Functional suppression in mammalian cells of nonsense mutations in the herpes simplex virus thymidine kinase gene by suppressor tRNA genes