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Nucleic Acids Research, 1977, Vol. 4, No. 8 2893-2902
© 1977

Articles

Photoreactivation and dark repair of ultraviolet light-induced pyrimidine dimers in chloroplast DNA

Gary D. Small and Carolyn S. Greimann

Division of Biochemistry, Physiology, and Pharmacology, Section on Biochemistry, The University of South Dakota Vermillion, SD 57069, USA

Received June 10, 1977. A UV-specific endonuclease was used to detect ultraviolet light-induced pyrimidine dimers in chloroplast DNA of Chlamydomonas reinhardi that was specifically labeled with tritiated thymidine. All of the dimers induced by 100 J/m2 of 254 nm light are removed by photoreaction. Wild-type cells exposed to 50 J/m2 of UV light removed over 80% of the dimers from chloroplast DNA after 24 h of incubation in growth medium in the dark. A UV-sensitive mutant, UVS 1, defective in the excision of pyrimidine dimers from nuclear DNA is capable of removing pyrimidine dimers from chloroplast DNA nearly as well as wild-type, suggesting that nuclear and chloroplast DNA dark-repair systems are under separate genetic control.


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