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REPAIR OF PYRIMIDINE DIMERS IN ULTRAVIOLET‐IRRADIATED CHLAM YDOMONAS

Abstract— A UV‐specific endonuclease was used to monitor the presence of UV‐induced pyrimidine dimers in the DNA of Chlamydomonas reinhardi. All of the dimers induced by 50 J/m2 of 254 nm light are removed by a 2 h exposure to photoreactivating light. Nearly all of the dimers are removed by the wild‐type strain of Chlamydomonas upon incubation for 24h in the dark. Two UV‐sensitive mutants, UVS 1 and UVS 6, are deficient in removal of dimers in the dark. These results are interpreted to mean that Chlamydomonas has an excision‐repair pathway for coping with UV‐induced damage.