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Distinct evolutionary origins of common multi-drug resistance phenotypes in Salmonella typhimurium DT104: a convergent process for adaptation under stress

  • Le Tang
  • Song-Ling Zhu
  • Xin Fang
  • Yong-Guo Li
  • Cornelis Poppe
  • Randal N. Johnston
  • Gui-Rong LiuEmail author
  • Shu-Lin LiuEmail author
Original Article
  • 28 Downloads

Abstract

Antimicrobial resistance makes pathogenic bacteria hard to control, but little is known about the general processes of resistance gain or loss. Here, we compared distinct S. typhimurium DT104 strains resistant to zero, two, five, or more of the tested antimicrobials. We found that common resistance phenotypes could be encoded by distinct genes, on SGI-1 or plasmid. We also demonstrated close clonality among all the tested non-resistant and differently resistant DT104 strains, demonstrating dynamic acquisition or loss (by total deletion or gradual decaying of multi-drug resistance gene clusters) of the genetic traits. These findings reflect convergent processes to make the bacteria resistant to multiple antimicrobials by acquiring the needed traits from stochastically available origins. When the antimicrobial stress is absent, the resistance genes may be dropped off quickly, so the bacteria can save the cost for maintaining unneeded genes. Therefore, this work reiterates the importance of strictly controlled use of antimicrobials.

Keywords

Salmonella typhimurium DT104 Antimicrobial resistance SGI-1 P972816 Convergent process Pathogenic evolution 

Notes

Funding

This study was funded by a grant of the National Natural Science Foundation of China (NSFC31600001), a National Postdoctoral Fellowship of China (2016M600266), and an Alberta Innovates Health Solutions (AIHS) Postdoctoral Fellowship of Canada to LT; Genome Canada grant 256177 to CP; and grants of the National Science Foundation of China (NSFC81030029, 81271786, 81671980, and 81871623) to SLL.

Compliance with ethical standards

Conflict of interest

All authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Le Tang
    • 1
    • 2
    • 6
  • Song-Ling Zhu
    • 1
    • 2
  • Xin Fang
    • 1
    • 2
  • Yong-Guo Li
    • 3
  • Cornelis Poppe
    • 4
  • Randal N. Johnston
    • 5
  • Gui-Rong Liu
    • 1
    • 2
    Email author
  • Shu-Lin Liu
    • 1
    • 2
    • 3
    • 7
    Email author
  1. 1.Systemomics Center, College of Pharmacy, and Genomics Research CenterHarbin Medical UniversityHarbinChina
  2. 2.HMU-UCCSM Centre for Infection and GenomicsHarbin Medical UniversityHarbinChina
  3. 3.Department of Infectious Diseases of First Affiliated HospitalHarbin Medical UniversityHarbinChina
  4. 4.Laboratory for Foodborne ZoonosesPublic Health Agency of CanadaGuelphCanada
  5. 5.Department of Biochemistry and Molecular BiologyUniversity of CalgaryCalgaryCanada
  6. 6.Department of Ecosystems and Public HealthUniversity of CalgaryCalgaryCanada
  7. 7.Microbiology, Immunology and Infectious DiseasesUniversity of CalgaryCalgaryCanada

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