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

Abstract:

: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.

journal_name

Carcinogenesis

journal_title

Carcinogenesis

authors

van der Vliet GM,Zielenska M,Anderson MW,Glickman BW

doi

10.1093/carcin/10.5.949

subject

Has Abstract

pub_date

1989-05-01 00:00:00

pages

949-52

issue

5

eissn

0143-3334

issn

1460-2180

journal_volume

10

pub_type

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