Genetic complementation of UV-induced DNA repair in Chinese hamster ovary cells of the denV gene of phage T4
The denV gene of phage T4, encoding the pyrimidine dimer-specific DNA repair enzyme endonuclease V, has been introduced by DNA transfection into the UV-sensitive DNA repair-deficient Chinese hamster ovary (CHO) cell line UV5. Transformants were first selected for resistance to the antibiotic G418 conferred by the neo gene from Tn5 carried by the same plasmid. A majority of the isolated G418-resistant UV5 clones also showed an increased resistance to 254-nm UV light. One clone, designated I-A1, was found to have an intermediate level of colony-forming ability after UV irradiation when compared to UV5 and wild-type AA8 cells. A Southern blot showed that I-A1 carried a single integrated intact copy of the denV gene. Alkaline sucrose gradients revealed a dose-dependent appearance of breaks in the DNA of I-A1 cells following UV-irradiation, while unirradiated cells did not exhibit any significant breaks. Analysis of DNA repair by I-A1 was at least equal to the level of repair in AA8 cells. These results show that the prokaryotic denV gene can restore UV repair capabilities in vivo to CHO UV5 cells defective in repair of UV-induced damage.
- Research Organization:
- Temple Univ. School of Medicine, Philadelphia, PA
- OSTI ID:
- 6190602
- Journal Information:
- Proc. Natl. Acad. Sci. U.S.A.; (United States), Vol. 82:22
- Country of Publication:
- United States
- Language:
- English
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CHO CELLS
DNA REPAIR
GENETIC RADIATION EFFECTS
BACTERIOPHAGES
DOSE-RESPONSE RELATIONSHIPS
ENDONUCLEASES
GENES
ULTRAVIOLET RADIATION
ANIMAL CELLS
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
BIOLOGICAL RECOVERY
BIOLOGICAL REPAIR
DNA-ASE
ELECTROMAGNETIC RADIATION
ENZYMES
ESTERASES
GENETIC EFFECTS
HYDROLASES
MICROORGANISMS
PARASITES
PHOSPHODIESTERASES
RADIATION EFFECTS
RADIATIONS
RECOVERY
REPAIR
VIRUSES
560121* - Radiation Effects on Cells- External Source- (-1987)