Spontaneous antibiotic resistance mutation associated pleiotropic changes in Escherichia coli O157:H7

I. Tóth; Márta Csík; L. Emçdy

doi:10.1556/avet.51.2003.1.3

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Acta Veterinaria Hungarica

Volume/Issue:: Volume 51: Issue 1

Spontaneous antibiotic resistance mutation associated pleiotropic changes in Escherichia coli O157:H7

Authors:

I. Tóth

I. Tóth Department of General and Thoracic Surgery, Semmelweis Teaching Hospital H-3529 Miskolc, Csabai kapu 9-11, Hungary

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Márta Csík

Márta Csík József Fodor' National Center for Public Health Budapest, Hungary

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L. Emçdy

L. Emçdy Department of Medical Microbiology and Immunology, University of Pécs Pécs, Hungary

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Pages:: 29–44

Online Publication Date:: 22 Jul 2005

Publication Date:: 01 Jan 2003

Article Category:: Journal Article

DOI:: https://doi.org/10.1556/avet.51.2003.1.3

Keywords:: mutation; mutation; mutation; Escherichia coli; O157:H7; non-motile; antibiotic resistance; flagella; fliC

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Besides the well-known O157:H7 clone causing enterohaemorrhagic colitis and haemolytic uraemic syndrome in Europe, Japan and North America, the number of Escherichia coli isolates with non-motile (NM) phenotype has considerably increased. We supposed that spontaneous antibiotic resistance mutation could cause this phenotypic change. To model our hypothesis we isolated rifampicin- (Rif) and ampicillin- (Amp) resistant mutants from E. coli O157:H7 prototype strains 7785 and EDL933. Among Rif^r mutants we could isolate strains with no or reduced motility, while the Amp^r mutants became hypermotile. The biochemical profile of the mutants had not changed but phage sensitivity and generation time of the mutants were altered. Among the representative strains we did not find polymorphism with Southern blot analysis and no polymorphism was found in the fliC gene of the mutants. The described characteristics have proven to be stable. In a mice virulence assay by intravenous infections the virulence of the derivatives was also found to be changed. In summary, we found that the antibiotic-resistant phenotype in E. coli O157:H7 was coexpressed with several other phenotypic changes including motility and virulence. It can be assumed that expression of the involved phenotypes may be under the influence of a common regulatory cascade. Further work is needed to identify the components and mechanism of this regulatory system.

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Acta Veterinaria Hungarica

Print ISSN:: 0236-6290

Online ISSN:: 1588-2705

Editorial Board

Mária BENKŐ (Acta Veterinaria Hungarica, Budapest, Hungary)
Gábor BODÓ (University of Veterinary Medicine, Budapest, Hungary)
Béla DÉNES (University of Veterinary Medicine, Budapest Hungary)
Edit ESZTERBAUER (Veterinary Medical Research Institute, Budapest, Hungary)
Hedvig FÉBEL (University of Veterinary Medicine, Budapest, Hungary)
László FODOR (University of Veterinary Medicine, Budapest, Hungary)
János GÁL (University of Veterinary Medicine, Budapest, Hungary)
Balázs HARRACH (Veterinary Medical Research Institute, Budapest, Hungary)
Peter MASSÁNYI (Slovak University of Agriculture in Nitra, Nitra, Slovak Republic)
Béla NAGY (Veterinary Medical Research Institute, Budapest, Hungary)
Tibor NÉMETH (University of Veterinary Medicine, Budapest, Hungary)
Zsuzsanna NEOGRÁDY (University of Veterinary Medicine, Budapest, Hungary)
Dušan PALIĆ (Ludwig Maximilian University, Munich, Germany)
Alessandra PELAGALLI (University of Naples Federico II, Naples, Italy)
Kurt PFISTER (Ludwig-Maximilians-University of Munich, Munich, Germany)
László SOLTI (University of Veterinary Medicine, Budapest, Hungary)
József SZABÓ (University of Veterinary Medicine, Budapest, Hungary)
Péter VAJDOVICH (University of Veterinary Medicine, Budapest, Hungary)
János VARGA (University of Veterinary Medicine, Budapest, Hungary)
Štefan VILČEK (University of Veterinary Medicine in Kosice, Kosice, Slovak Republic)
Károly VÖRÖS (University of Veterinary Medicine, Budapest, Hungary)
Herbert WEISSENBÖCK (University of Veterinary Medicine, Vienna, Austria)
Attila ZSARNOVSZKY (Szent István University, Gödöllő, Hungary)

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Acta Veterinaria Hungarica
Language	English
Size	A4
Year of Foundation	1951
Volumes per Year	1
Issues per Year	4
Founder	Magyar Tudományos Akadémia
Founder's Address	H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher	Akadémiai Kiadó
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Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-6290 (Print)
ISSN	1588-2705 (Online)