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Title of Journal: Curr Microbiol

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Abbravation: Current Microbiology

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Springer US

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DOI

10.1016/0006-2952(61)90688-8

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1432-0991

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Genetic Variability of AdeRS TwoComponent System

Authors: S Montaña E Vilacoba G M Traglia M Almuzara M Pennini A Fernández A Sucari D Centrón M S Ramírez
Publish Date: 2015/05/05
Volume: 71, Issue: 1, Pages: 76-82
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Abstract

The emergence of tigecycline resistance has increased in the last years Although tigecyclineresistant Acinetobacter baumannii isolates were described all over the world few reports regarding the molecular basis of this resistance are available It has been recognized that the overexpression of AdeABC efflux pump is related to the tigecyclineresistant phenotype In 37 clinical A baumannii isolates we first determined the tigecyclineresistant phenotype and then within a selected group we analyzed the sequence of the adeRS operon which is involved in the expression of the AdeABC efflux pump Nucleotide sequence analysis of adeR and adeS showed the presence of 5 and 16 alleles respectively These results expose a high genetic variability in both genes the adeS gene being more susceptible to genetic variation The presence of 2 AdeR and 2 AdeS new variants were reported Two of the new AdeRS variants were present in the intermediate and the resistant tigecycline A baumannii isolates suggesting a putative role in the development of the observed phenotype More studies need to be addressed to determine the role of the genetic variability observed in the adeRS operon

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