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Related Experiment Videos

Genes and spectrum: the theoretical limits

S G Amyes1

  • 1Department of Medical Microbiology, Medical School, University of Edinburgh, Scotland.

Clinical Infectious Diseases : an Official Publication of the Infectious Diseases Society of America
|August 26, 1998
PubMed
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Antibiotic resistance evolves through gene mutations or imported genes. Versatile class A beta-lactamases adapt to new antibiotics, while other mechanisms rely on acquiring new genes.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Antibiotic resistance arises from chromosomal mutations or mobile genetic elements.
  • Mobile genes, particularly class A beta-lactamases, demonstrate significant adaptability to evolving antibiotic pressures.
  • Mechanisms of resistance vary in their capacity for adaptation.

Purpose of the Study:

  • To investigate the adaptability of different antibiotic resistance mechanisms.
  • To identify the most versatile resistance genes and their evolutionary strategies.
  • To understand the genetic basis of resistance evolution in bacteria.

Main Methods:

  • Analysis of genetic mutations in chromosomal and mobile genes.
  • Comparative genomics of beta-lactamase evolution.

Related Experiment Videos

  • Examination of trimethoprim resistance mechanisms in different bacterial species.

    • Main Results:

    • Class A beta-lactamases (TEM, SHV) exhibit high adaptability through successive mutations, broadening cephalosporin hydrolysis.
    • Class C beta-lactamases show some adaptability with subtle gene changes.
    • Trimethoprim resistance in gram-positive bacteria involves plasmid capture and minor modifications of dihydrofolate reductase.

    Conclusions:

    • Bacterial antibiotic resistance evolves through diverse genetic strategies.
    • Mobile genetic elements, especially class A beta-lactamases, are key drivers of adaptive resistance.
    • Less adaptable mechanisms often depend on acquiring novel resistance genes.