Reference: Fedorova IV (1978) [Reparation after the action of 8-methoxypsoralen and light (lambda=365 nm) on radiosensitive mutants of Saccharomyces cerevisiae yeasts]. Genetika 14(11):1884-91

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Abstract


The method of repeated irradiation allowed to study kinetics of excision of mono-adducts induced by 8-methoxypsoralen (8-MOP) plus light (lambda=365 nm) in DNA of UV-sensitive mutants rad4 and rad15 and X-ray sensitive mutants rad54, xrs2, xrs4. The survival of the mutant rad4 was not practically increased after incubation in complete liquid medium for 3 hours at 28 degrees C before the repeated irradiation. These data suggest that the mutant rad4 is characterized by nearly complete absence of the mono-adduct excision. The survival of mutants rad15 and rad54 in the same environment was increased less effectively than the survival of the control radioresistant strain, but the mutants xrs2 and xrs4 did not differ from the control strain. Possible causes of differences in survival between radiosensitive strains are discussed. The increased sensitivity of the excision defective strain (rad4) and of the postreplicative recombination defective strains (xrs2, xrs4, rad54) to the lethal effect of 8-MOP plus light (lambda=365 nm) suggests that two systems of reparation take part in the removal of photoproducts induced by 8-MOP in DNA of yeast cells.

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Fedorova IV
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