Genetics. Published Articles Ahead of Print: June 18, 2005, Copyright © 2005
doi:10.1534/genetics.105.045526


A more recent version of this article appeared on October 1, 2005.


Article

Intermediate mutation frequencies favor evolution of multidrug resistance

1 INSERM U722 - Université Paris 7
2 Hôpital Louis Mourier
3 Hôpital Bichat
4 Hôpital Poincaré
5 Hôpital Avicenne
6 INSERM U571 Faculte de medecine- Necker

* To whom correspondence should be addressed. E-mail: matic{at}necker.fr.

Submitted on May 11, 2005
Revised on May 20, 2005
Accepted on 20 May 2005


Abstract

Studying the interplay between mutation frequencies and antibiotic resistance among Escherichia coli natural isolates, we observed that modest modifications of mutation frequency may significantly influence the evolution of antibiotic resistance. The strains having intermediate mutation frequencies have significantly more antibiotic resistances than strains having low and high mutation frequencies.

Key Words: bacteria, drug resistance, evolution, mutagenesis, mutators




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