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Related Experiment Videos

Combinatorial genetic evolution of multiresistance.

Timothy R Walsh1

  • 1Department of Molecular and Cellular Medicine, School of Medical Sciences, University of Bristol, Bristol BS8 1TD, UK. t.r.walsh@bristol.ac.uk

Current Opinion in Microbiology
|September 1, 2006
PubMed
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Clinical bacteria acquire antibiotic resistance genes through environmental plasmids and mobile genetic elements. Antibiotic use can accelerate the spread of these resistance genes, posing long-term threats.

Area of Science:

  • Bacterial genetics and genomics
  • Antimicrobial resistance mechanisms
  • Molecular biology

Background:

  • The rapid increase in genetic data has not necessarily improved understanding of bacterial genetics or the dominance of specific antibiotic-resistant genotypes like blaCTX-M-15 and blaVIM-2.
  • Clinical bacterial isolates frequently utilize plasmids derived from environmental bacteria.
  • The proliferation of antibiotic resistance is exacerbated by mobile genetic elements.

Purpose of the Study:

  • To explore the genetic mechanisms underlying the prevalence of antibiotic resistance in clinical bacterial isolates.
  • To investigate the role of plasmids and other genetic elements in the dissemination of antibiotic resistance.
  • To understand how environmental factors, such as antibiotic presence, influence the spread of resistance.

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Main Methods:

  • Analysis of genetic information from clinical bacterial isolates.
  • Identification and characterization of plasmids and mobile genetic elements (transposons, integrons, IS elements, ISCR elements).
  • Investigation of bacterial responses to antibiotic exposure, including the SOS response.

Main Results:

  • Clinical isolates have acquired resistance through plasmids originating from environmental bacteria.
  • Combinatorial presence of transposons, integrons, insertion sequence (IS) elements, and IS common region (ISCR) elements contribute to antibiotic resistance clusters.
  • Antibiotics like fluoroquinolones can trigger bacterial SOS responses, promoting the transfer of large genetic elements and potentially long-term detrimental effects.

Conclusions:

  • Bacterial antibiotic resistance is a complex issue driven by the 'hijacking' of environmental plasmids and the accumulation of various mobile genetic elements.
  • The presence of antibiotics can act as a selective pressure, accelerating the spread of resistance genes and mobile genetic elements.
  • Understanding these genetic dynamics is crucial for combating the growing threat of antimicrobial resistance.