Singlet molecular oxygen induced mutagenicity in a mammalian SV40-based shuttle vector.
We have determined the deleterious effects of singlet oxygen (1O2), generated by thermal decomposition of the water-soluble endoperoxide 3,3'-(1,4-naphthylidene)dipropionate (NDPO2), on plasmid DNA. By following the electrophoretic mobility of DNA on agarose gels, we detected single and double strand breaks induced by treatment with NDPO2. The vector employed was a mammalian shuttle vector and the mutagenic consequences of these damages were investigated, using as mutation target the supF suppressor tRNA gene. A high increase of the mutation frequency, over the background, was observed in plasmids transfected in bacteria or after passage through mammalian cells. Trapping agents and quencher effects and other controls confirm the involvement of 1O2 in DNA damage and mutagenicity. These findings indicate that 1O2 can induce DNA lesions which are repaired by an error-prone process in prokaryotic and eukaryotic cells.
Di Mascio
P
P
Institut fur Physiologische Chemie I, University of Dusseldorf, W. Germany.
Menck
C F
CF
Nigro
R G
RG
Sarasin
A
A
Sies
H
H
D000818:Animals; D002460:Cell Line; D004926:Escherichia coli / Q000235:genetics; D005822:Genetic Vectors; D009154:Mutation; D010100:Oxygen / Q000494:pharmacology; D010777:Photochemistry; D010957:Plasmids / Q000187:drug effects* / Q000528:radiation effects; D015183:Restriction Mapping; D013539:Simian virus 40 / Q000187:drug effects / Q000235:genetics* / Q000528:radiation effects; D026082:Singlet Oxygen
D026082:Singlet Oxygen; D010100:Oxygen