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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Repair of exogenous (plasmid) DNA damaged by photoaddition of 8-methoxypsoralen in the yeast Saccharomyces cerevisiae.

The contribution of different repair pathways to the repair of 8-methoxypsoralen (8-MOP) plus UVA induced lesions on a centromeric plasmid (YCp50) was investigated in the yeast Saccharomyces cerevisiae using the lithium acetate transformation method. The pathways of excision-resynthesis (RAD1) and recombination (RAD52) were found to be involved in the repair of exogenous as well as of genomic DNA. Mutants in RAD6 and PSO2 genes showed the same transformation efficiency with 8-MOP plus UVA treated plasmid as wild-type cells suggesting that these latter pathways involved in mutagenesis are not operating on plasmid DNA although required for the repair of 8-MOP photoadducts induced in genomic DNA. These results indicate that DNA-repair gene products may be differently involved in the repair of exogenous and endogenous DNA depending on the repair system and the nature of the DNA damage considered.[1]


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