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An Escherichia coli mutant refractory to nitrosoguanidine mutagenesis

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Summary

A newly-isolated Escherichia coli mutant suffers only about 10% as many mutations as normal strains on exposure to nitrosoguanidine1. The responsible mutation, inm-1, maps at approximately minute 79 in the current E. coli genetic map. The mutant is normal for overall growth, nitrosoguanidine lethality, spontaneous mutagenesis, ultraviolet light lethality and mutagenesis, ethyl methanesulfonate lethality and mutagenesis, and the adaptive repair induced by alkylating agents. The existence of this mutation proves that nitrosoguanidine mutagenesis is not merely the result of reactions between the chemical and DNA, but requires specific cellular function(s), and underscores the peculiarity of nitrosoguanidine as a mutagen.

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Author notes

  1. Rosa Ruiz-Vázquez

    Present address: Max-Planck-Institut für Molekulare Genetik, D-1000, Berlin (Dahlem) 33

Authors and Affiliations

  1. Departmento de Genética, Facultad de Biologîa, Universidad de Sevilla, Spain

    Rosa Ruiz-Vázquez & E. Cerdá-Olmedo

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  1. Rosa Ruiz-Vázquez
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  2. E. Cerdá-Olmedo
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Communicated by K. Isono

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Ruiz-Vázquez, R., Cerdá-Olmedo, E. An Escherichia coli mutant refractory to nitrosoguanidine mutagenesis. Molec. gen. Genet. 178, 625–631 (1980). https://doi.org/10.1007/BF00337870

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  • DOI: https://doi.org/10.1007/BF00337870

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