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. 1972 Mar;109(3):979–986. doi: 10.1128/jb.109.3.979-986.1972

Repair of Pyrimidine Dimer Damage Induced in Yeast by Ultraviolet Light

Michael A Resnick a,1, Jane K Setlow a
PMCID: PMC247317  PMID: 4551759

Abstract

Crude extracts from ultraviolet (UV)-irradiated yeast cells compete with UV-irradiated transforming deoxyribonucleic acid (DNA) for photoreactivating enzyme. The amount of competition is taken as a measure of the level of cyclobutyl pyrimidine dimers in the yeast DNA. A calibration of the competition using UV-irradiated calf thymus DNA indicates that an incident UV dose (1,500 ergs/mm2) yielding 1% survivors of wild-type cells produces between 2.5 × 104 to 5 × 104 dimers per cell. Wild-type cells irradiated in the exponential phase of growth remove or alter more than 90% of the dimers within 220 min after irradiation. Pyrimidine dimers induced in stationary-phase wild-type cells appear to remain in the DNA; however, with incubation, they become less photoreactivable in vivo, although remaining photoreactivable in vitro. In contrast, exponentially growing or stationary-phase UV-sensitive cells (rad2-17) show almost no detectable alteration of dimers. We conclude that the UV-sensitive cells lack an early step in the repair of UV-induced pyrimidine dimers.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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