Summary
The induction in Saccharomyces cerevisiae of mitotic gene conversion and crossing-over by photoaddition of mono and bifunctional psoralen derivatives as well as by mono (HN1) and bifunctional (HN2) nitrogen mustards or 254 nm ultraviolet (UV) radiation was compared in wild type and in a mutant, pso2-1, initially selected for sensitivity to DNA cross-linking agents. The induction of the same recombinational events by photoaddition of one mono and one bifunctional derivative of psoralen was also examined in the rad52-1 diploid strain.
The non-reciprocal (gene conversion) and the reciprocal (crossing-over) events follow the same patterns for each agent tested regarding the relative sensitivities of the wild type and repair-deficient strains.
The pso2-1 strain retains the same or even a greater ability to perform recombination than the wild type following exposure to monofunctional agents, as well as to HN2 and UV. In contrast, this mutant is not able to perform mitotic recombination as efficiently as the wild type specifically after photoaddition of bifunctional furocoumarins. Such a difference is not simply due to the relative toxicity of the inducing agents.
The rad52-1 mutant is blocked in induced recombination by the photoaddition of both the mono and bifunctional furocoumarins tested and the same was already established for UV and γ-rays.
The rad52-1 and pso2-1 mutant strains have in common a high sensitivity in the G2 phase of the cell cycle and a loss of the ability to restitute high molecular weight DNA after the appearance of DNA double strand breaks related to the incision of inter-strand cross-links. This leads to a generalised block in recombination ability in rad52 whereas in the pso2-1 mutant the nature of the deficiency in recombination is much more specific.
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Saeki, T., Cassier, C. & Moustacchi, E. Induction in Saccharomyces cerevisiae of mitotic recombination by mono and bifunctional agents: Comparison of the pso 2-1 and rad52 repair deficient mutants to the wild-type. Mol Gen Genet 190, 255–264 (1983). https://doi.org/10.1007/BF00330648
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DOI: https://doi.org/10.1007/BF00330648