Detection and linkage to mobile genetic elements of tetracycline resistance gene tet(M) in Escherichia coli isolates from pigs

BMC Veterinary Research

Yvonne Agersø¹  Lisbeth E de Vries¹  José A Orden²  José A Ruiz-Santa-Quiteria²  Ricardo de la Fuente²  Sonia Jurado-Rabadán² 

[1] National Food Institute, Technical University of Denmark, Copenhagen V, Denmark;Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, 28040 Madrid, Spain

关键词: Horizontal gene transfer;    tet(M);    Pigs;    E. coli;   

Others  :  864977
DOI  :  10.1186/1746-6148-10-155

 received in 2013-12-12, accepted in 2014-07-04,  发布年份 2014

【 摘 要 】

Background

In Escherichia coli the genes involved in the acquisition of tetracycline resistance are mainly tet(A) and tet(B). In addition, tet(M) is the most common tetracycline resistance determinant in enterococci and it is associated with conjugative transposons and plasmids. Although tet(M) has been identified in E. coli, to our knowledge, there are no previous reports studying the linkage of the tet(M) gene in E. coli to different mobile genetic elements. The aim of this study was to determine the occurrence of tet(A), tet(B), and tet(M) genes in doxycycline-resistant E. coli isolates from pigs, as well as the detection of mobile genetic elements linked to tet(M) in E. coli and its possible transfer from enterococci.

Results

tet(A) was the most frequently detected gene (87.9%) in doxycycline-resistant isolates. tet(M) was found in 13.1% E. coli isolates. The tet(M) gene was detected in relation with conjugative transposons in 10 out of 36 enterococci isolates analyzed but not in any of E. coli isolates positive for tet(M). Southern blot showed that in E. coli and in most of the enterococci isolates the tet(M) gene was carried on a plasmid. According to the phylogenetic analysis, E. coli contained a new tet(M) allele grouping separately. Mating experiments revealed that tet(M) was carried on a mobile element successfully transferred between enterococci and between enterococci and E. coli.

Conclusions

The detection of tet(M) in E. coli isolates from pigs was higher than expected. In our study, tet(M) detected in E. coli seems not to have been transferred from enterococci, although it can not be ruled out that the horizontal transfer of this gene occurred from other intestinal tract bacteria.

【 授权许可】

   
2014 Jurado-Rabadán et al.; licensee BioMed Central Ltd.

【 图 表 】

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