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

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Mutational specificity of the ferrous ion in a supF gene of endonuclease III/VIII deficient Escherichia coli.

When 125 microM Fe2+/EDTA treated plasmid pUB3 was used to transfect an Escherichia coli NKJ2004 (nth nei) host, which is totally defective in glycosylases for thymine glycol and 5-hydroxycytosine, a 3.7 fold increase in mutation frequency was observed. Among 46 supF mutants sequenced, 28 had base substitutions, with G:C-->C:G transversion predominant (14 cases), followed by G:C-->T:A transversion (6 cases) and G:C-->A:T transition (6 cases). The results are consistent with our previous Fe2+ mutagenesis results where, in the wild type host, 78% were base substitutions, with G:C-->C:G transversion (59%) predominant, followed by G:C-->T:A transversion (28%) and G:C-->A:T transition (11%). Treatment of pUB3 DNA with Fe2+/EDTA did not yield formation of Endonuclease III sensitive sites. The possibility of 5-hydroxycytosine as the causative lesion for Fe2+ induced G:C-->C:G transversion is discussed.[1]

References

  1. Mutational specificity of the ferrous ion in a supF gene of endonuclease III/VIII deficient Escherichia coli. Shimamura, H., Akasaka, S., Kubo, K., Saito, Y., Nakajima, S., Tano, K., Utsumi, H., Yamamoto, K. J. Radiat. Res. (1997) [Pubmed]
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