Disappearance of oxytetracycline resistance genes in aquatic systems.

Article Details

Citation

Copy to clipboard

Engemann CA, Adams L, Knapp CW, Graham DW

Disappearance of oxytetracycline resistance genes in aquatic systems.

FEMS Microbiol Lett. 2006 Oct;263(2):176-82.

PubMed ID

16978353 [ View in PubMed

]

Abstract

The disappearance of selected tetracycline resistance genes was investigated in different simulated receiving waters to determine conditions that maximize resistance gene loss after release. Wastewater from an operating cattle feedlot lagoon was provided to four pairs of duplicate 3-L flasks, and tet(O), tet(W), tet(M), tet(Q), and 16S rRNA gene levels were monitored over 29 days using real-time PCR. Treatments included simulated sunlight with 0, 25, and 250 microg L(-1) nominal oxytetracycline (OTC) levels, respectively, and 'dark' conditions. Gene disappearance rates were always highest when light was present, regardless of OTC level. First-order loss coefficients (k(d)) for the sum of resistance genes were 0.84, 0.75, and 0.81 day(-1) for 0.0, 25, and 250 microg L(-1) OTC treatments over the first 7 days after release, respectively, whereas k(d) was 0.49 day(-1) under dark conditions, which is significantly lower (P<0.10). k(d) varied fourfold among the four individual genes, although disappearance patterns were similar among genes. Results suggest that light exposure should be maximized in receiving waters in order to maximize resistance gene loss rate after release.

DrugBank Data that Cites this Article

Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Oxytetracycline	16S ribosomal RNA	Nucleotide	Enteric bacteria and other eubacteria	Unknown	Inhibitor	Details