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

The complexity of nitrosoguanidine mutagenesis increases with size: observations of the mutational specificity of N-propyl-N'-nitro-N-nitrosoguanidine.

The mutational specificity of the monofunctional alkylating agent N-propyl-N'-nitro-N-nitrosoguanidine (PNNG) has been determined through the DNA sequence characterization of 109 LacI- mutations of Escherichia coli. The predominant mutation induced was the G:C----A:T transition (73%), presumably the result of O6-propylguanine damage. Transversions constituted 18% of the mutants, almost entirely due to G:C----T:A (9%) and A:T----C:G (8%) events. Two identical deletions, one single base pair frameshift and a tandem double base change were also recovered. In contrast, N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) was previously found to induce only transitions, again predominantly G:C----A:T events (98%). Moreover, the site specificity observed for PNNG-induced G:C----A:T transitions is quite distinct from that induced by MNNG. G:C----A:T transitions recovered following PNNG treatment do not appear to be influenced by neighbouring base sequence to the extent seen for MNNG.[1]


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