Resistance Mutations in gyrA and parC are Common in Escherichia Communities of both Fluoroquinolone-Polluted and Uncontaminated Aquatic Environments
Artikel i vetenskaplig tidskrift, 2015

Alterations in the target proteins of fluoroquinolones, especially in GyrA and ParC, are known to cause resistance. Here, we investigated environmental Escherichia communities to explore the possible link between the abundance of mutations, and the exposure to fluoroquinolones. Sediment samples were collected from a relatively pristine lake, up and downstream from a sewage treatment plant, and from several industrially polluted sites. The quinolone resistance-determining regions of gyrA and parC were analyzed using amplicon sequencing of metagenomic DNA. Five non-synonymous substitutions were present in all samples, and all of these mutations have been previously linked to fluoroquinolone resistance in Escherichia coli. In GyrA, substitutions S83L and D87N were on average detected at frequencies of 86 and 32%, respectively, and 31% of all amplicons encoded both substitutions. In ParC, substitutions S80I, E84G, and E84V were detected in 42, 0.9, and 6.0% of the amplicons, respectively, and 6.5% encoded double substitutions. There was no significant correlation between the level of fluoroquinolone pollution and the relative abundance of resistance mutations, with the exception of the most polluted site, which showed the highest abundance of said substitutions in both genes. Our results demonstrate that resistance mutations can be common in environmental Escherichia, even in the absence of a fluoroquinolone selective pressure.

Fluoroquinolones

pharmaceutical pollution

antibiotic resistance

Författare

Anna Johnning

Chalmers, Matematiska vetenskaper, matematisk statistik

Göteborgs universitet

Erik Kristiansson

Göteborgs universitet

Chalmers, Matematiska vetenskaper, matematisk statistik

Jerker Fick

Umeå universitet

Birgitta Weijdegård

Göteborgs universitet

D. G. Joakim Larsson

Göteborgs universitet

Frontiers in Microbiology

1664-302X (ISSN)

Vol. 6 DEC 1355- 01355

Ämneskategorier

Mikrobiologi

Bioinformatik och systembiologi

Styrkeområden

Livsvetenskaper och teknik

DOI

10.3389/fmicb.2015.01355

Mer information

Senast uppdaterat

2018-02-27