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Area of Science:

  • Microbiology
  • Molecular Biology
  • Antimicrobial Resistance

Background:

  • Methicillin-resistant Staphylococcus aureus (MRSA) poses a significant public health threat.
  • Novel cephalosporins like ceftobiprole and ceftaroline show activity against MRSA.
  • Understanding resistance mechanisms is crucial for effective treatment strategies.

Purpose of the Study:

  • To investigate the role of mecA mutations in conferring resistance to ceftobiprole and ceftaroline.
  • To characterize resistance mechanisms in MRSA strains exposed to these antibiotics.

Main Methods:

  • Utilized MRSA strains COL and SF8300 for experimental evolution.
  • Passaged strains in the presence of ceftaroline to select for resistant mutants.
  • Sequenced relevant genes (e.g., mecA, pbp2, pbp4, gdpP) in resistant isolates.
  • Assessed resistance levels to ceftobiprole and ceftaroline.

Main Results:

  • A single mecA mutation (E447K) in strain SF8300 resulted in low-level resistance to ceftaroline.
  • Introduction of the E447K mecA mutation into strain COL conferred high-level resistance to ceftobiprole but low-level resistance to ceftaroline.
  • A ceftaroline-resistant mutant of strain COL acquired mutations in pbp2, pbp4, and gdpP, but not in mecA, conferring high-level resistance to both cephalosporins.

Conclusions:

  • mecA mutations can contribute to resistance against novel cephalosporins, but the effect varies depending on the specific mutation and strain background.
  • Alternative resistance mechanisms involving mutations in other genes (pbp2, pbp4, gdpP) can also lead to high-level resistance to ceftobiprole and ceftaroline in MRSA.
  • These findings highlight the complex genetic basis of cephalosporin resistance in MRSA and the potential for diverse resistance pathways.