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Reference: Kiefer J and Feige M (1993) The significance of DNA double-strand breaks in the UV inactivation of yeast cells. Mutat Res 299(3-4):219-24

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Abstract


The radiation-sensitive mutant rad 54-3 of Saccharomyces cerevisiae temperature-conditional for the repair of DNA double-strand breaks was exposed to 254 nm ultraviolet radiation and incubated at the restrictive and permissive temperatures. A large difference in survival was seen indicating the involvement of double-strand breaks in cellular inactivation at least in this strain. Pulsed-field gel electrophoresis of DNA showed that double-strand breaks are not directly induced but develop upon incubation under growth conditions. Their number is highest after about 4 h, after 8 h repair is complete in wild-type cells. With the aid of the excision-deficient double mutant rad3rad54 it could be demonstrated that strand break formation proceeds independent of excision repair.

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Journal Article
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Kiefer J, Feige M
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