A Novel Trimethoprim Resistance Gene, dfrA36, Characterized from Escherichia coli from Calves.

Wüthrich, Dominik; Brilhante, Michael; Hausherr, Anna; Becker, Jens; Meylan, Mireille; Perreten, Vincent (2019). A Novel Trimethoprim Resistance Gene, dfrA36, Characterized from Escherichia coli from Calves. mSphere, 4(3) American Society for Microbiology 10.1128/mSphere.00255-19

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Whole-genome sequencing of trimethoprim-resistant Escherichia coli strains MF2165 and PF9285 from healthy Swiss fattening calves revealed a so far uncharacterized dihydrofolate reductase gene, dfrA36 Functionality and association with trimethoprim resistance were demonstrated by cloning and expressing dfrA36 in E. coli The DfrA36 protein showed the closest amino acid identity (49.4%) to DfrA20 from Pasteurella multocida and to the Dfr determinants DfrG (41.2%), DfrD (40.8%), and DfrK (40.0%) found in Gram-positive bacteria. The dfrA36 gene was integrated within a florfenicol/chloramphenicol-sulfonamide resistance ISCR2 element (floR-ISCR2-dfrA36-sul2) next to a Tn21-like transposon that contained genes with resistance to sulfonamides (sul1), streptomycin (aadA1), gentamicin/tobramycin/kanamycin (aadB), and quaternary ammonium compounds (qacEΔ1). A search of GenBank databases revealed that dfrA36 was present in 26 other E. coli strains from different origins as well as in AcinetobacterIMPORTANCE The presence of dfrA36 associated with ISCR2 in Escherichia coli from animals, as well as its presence in other E. coli strains from different sources and countries and in Acinetobacter, highlights the global spread of this gene and its potential for further dissemination. The genetic link of ISCR2-dfrA36 with other antibiotic and disinfectant resistance genes showed that multidrug-resistant E. coli may be selected and maintained by the use of either one of several antimicrobials.

Item Type:

Journal Article (Original Article)

Division/Institute:

05 Veterinary Medicine > Research Foci > Veterinary Public Health / Herd Health Management
05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP) > Institute of Veterinary Bacteriology > Molecular Bacterial Epidemiology and Infectiology
05 Veterinary Medicine > Research Foci > Host-Pathogen Interaction
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV)
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > Clinic for Ruminants
05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP)
05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP) > Institute of Veterinary Bacteriology

UniBE Contributor:

Wüthrich, Dominik; Quinta Brilhante, Michael; Hausherr, Anna; Becker, Jens Michael; Meylan, Mireille and Perreten, Vincent

Subjects:

500 Science > 570 Life sciences; biology
600 Technology > 630 Agriculture

ISSN:

2379-5042

Publisher:

American Society for Microbiology

Language:

English

Submitter:

Vincent Perreten

Date Deposited:

20 Sep 2019 12:33

Last Modified:

03 Nov 2019 00:41

Publisher DOI:

10.1128/mSphere.00255-19

PubMed ID:

31068437

Uncontrolled Keywords:

Escherichia coli animals antibiotic resistance gene cassettes trimethoprim

BORIS DOI:

10.7892/boris.133379

URI:

https://boris.unibe.ch/id/eprint/133379

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