Analysis of the excision repair of nondimer DNA damage induced by solar ultraviolet radiation in ICR 2A frog cells
The excision repair of solar uv-induced nondimer DNA damage was examined in ICR 2A frog cells through the use of the bromodeoxyuridine (BrdUrd) photolysis assay. A relatively pure population of nondimer DNA photoproducts was induced by irradiation of ICR 2A cells with the Mylar-filtered solar ultraviolet (uv) wavelengths produced by a fluorescent sunlamp followed by exposure to photoreactivating light (PRL) which removes most of the small yield of pyrimidine dimers induced by this treatment. Cultures of cells were also exposed to 254 nm uv, which induces primarily dimers, and /sup 60/Co ..gamma.. rays. Through use of a modification of the BrdUrd photolysis assay possessing enhanced sensitivity, it was found that the solar uv-induced nondimer DNA damage was repaired by a short patch repair mechanism in which less than approximately 20 nucleotides are inserted into a repaired region. Similar results were also obtained for ..gamma..-irradiated cells. In contrast, excision repair of 254-nm-induced dimers was accomplished by a long-patch process in which an average of about 180 nucleotides are inserted into the repaired sites.
- Research Organization:
- Univ. of Texas Health Science Center, Dallas
- OSTI ID:
- 5321714
- Journal Information:
- Radiat. Res.; (United States), Vol. 103:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ANIMAL CELLS
BIOLOGICAL RADIATION EFFECTS
DNA
EXCISION REPAIR
BUDR
COBALT 60
EXTREME ULTRAVIOLET RADIATION
GAMMA RADIATION
PHOTOLYSIS
PYRIMIDINE DIMERS
SOLAR RADIATION
ANTIMETABOLITES
AZINES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOLOGICAL EFFECTS
BIOLOGICAL RECOVERY
BIOLOGICAL REPAIR
BROMOURACILS
CHEMICAL REACTIONS
COBALT ISOTOPES
DECOMPOSITION
DNA REPAIR
DRUGS
ELECTROMAGNETIC RADIATION
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IONIZING RADIATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MINUTES LIVING RADIOISOTOPES
NUCLEI
NUCLEIC ACIDS
NUCLEOSIDES
NUCLEOTIDES
ODD-ODD NUCLEI
ORGANIC BROMINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PYRIMIDINES
RADIATION EFFECTS
RADIATIONS
RADIOISOTOPES
RECOVERY
REPAIR
RIBOSIDES
STELLAR RADIATION
ULTRAVIOLET RADIATION
URACILS
YEARS LIVING RADIOISOTOPES
560152* - Radiation Effects on Animals- Animals