PMID: 6969848Aug 1, 1980Paper

Further studies on the induction of mutation in Haemophilus influenzae by N-methyl-N'-nitro-N-nitrosoguanidine: lack of an inducible error-free repair system and the effect of exposure medium

Mutation Research
R F Kimball

Abstract

Haemophilus influenzae is shown to lack the inducible, error-free repair system for alkylation damage that others have found in Escherichia coli. Prior growth in a low concentration of N-methyl-N'-nitro-N-nitrosoguanidine had only an additive effect on a subsequent brief exposure to a high concentration. Furthermore, chloramphenicol did not significantly modify the mutagenic response. In both respects, H. influenzae differs from E. coli. Experiments carried out in preparation for these tests showed that exposure to N-methyl-N'-nitro-N-nitrosoguanidine in complex growth medium was more effective by about an order of magnitude than exposure in pH 6.0 tris--maelare buffer in inducing mutations, in killing the cells, and in causing strand breaks in the preexisting DNA and gaps in newly synthesized DNA. Thus the effect of the medium is on the amount of initial damage rather than on some special feature of the mutation process. Part but not all of the effect can be accounted for by the difference in pH of the 2 media. The nature of the mutagenic process is the same under the 2 exposure conditions; i.e., reparable pre-mutational damage is produced by the agent and subsequently converted to final mutation by replication. The dose--effe...Continue Reading

References

May 19, 1977·Nature·L Samson, J Cairns
Mar 24, 1971·Nature: New Biology·N GuerolaE Cerdá-Olmedo
Jul 5, 1979·Nature·P Robins, J Cairns

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Citations

Sep 25, 1990·Nucleic Acids Research·F MorohoshiN Munakata
Mar 1, 1988·Microbiological Reviews·E C Friedberg
Feb 1, 1983·Journal of Bacteriology·C T HaddenS Mitra
Sep 1, 1982·Mutation Research·T Gichner, J Velemínský
Dec 1, 1991·Journal of Bacteriology·A R Fernandez de Henestrosa, J Barbé
Jun 1, 1991·Journal of Bacteriology·P Vaughan, B Sedgwick

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