亚剂量抗生素诱导抗性基因水平迁移

Translated title of the contribution: Antibiotics Induce Horizontal Gene Transfer of Resistance at Sublethal Concentrations

Qi Yi Yuan, Hong Jie Chen, Laurence Haller, Yi Liang He

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

In order to explore the conjugation of genes encoding extended-spectrum β-lactamase (ESBL), ESBL-expressing P. aeruginosa and E. coli strains isolated from the wastewater of major hospitals in Singapore were used as donors. gfp-tagged E. coli SCC1 strains resistant to chloramphenicol (CHL) were chosen as recipients. Using response surface analysis, we detected and analyzed the induction of conjugal transfer under single-exposure and co-exposure of tetracycline (TC), sulfamethoxazole (SMZ), and ceftazidime (CAZ) at sublethal concentrations. It was found that the ESBL plasmid could be conjugal transferred from P. aeruginosa and E. coli strains to the recipient E. coli SCC1 strains at an average frequency of 0.001 5 and 0.004 2, respectively, without stress from inducing antibiotics, thus showing a low fitness cost and higher conjugal frequency between E. coli strains under the exposure of sub-MIC antibiotics. A significant conjugation between E. coli strains occurred under the single-exposure or co-exposure of a TC concentration of <0.03 mg•L-1 and a CAZ concentration of <0.002 mg•L-1, as inhibited by a sub-MIC level of TC. The conjugation between P. aeruginosa and E. coli strains was stimulated under the exposure of TC and CAZ with concentrations 5-times larger than the MIC, while no significant induction was detected from the sub-MIC antibiotics.

Translated title of the contributionAntibiotics Induce Horizontal Gene Transfer of Resistance at Sublethal Concentrations
Original languageChinese (Traditional)
Pages (from-to)3748-3757
Number of pages10
JournalHuanjing Kexue/Environmental Science
Volume41
Issue number8
DOIs
StatePublished - 15 Aug 2020
Externally publishedYes

Keywords

  • Antibiotics
  • Extended-spectrum β-lactamase (ESBL)
  • Plasmids
  • Response surface analysis
  • Sublethal
  • Transconjugants

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