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Expression of resistance to methicillin
1Dept of Medical Microbiology, University of Zürich, Switzerland.
Trends in Microbiology
|October 1, 1994
Summary
Methicillin-resistant staphylococci possess PBP2a, encoded by the mecA gene, contributing to resistance. Other genes, like fem and aux, also influence resistance levels in these bacteria.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Methicillin resistance in staphylococci is a significant clinical challenge.
- The mecA gene encodes a low-affinity penicillin-binding protein, PBP2a, crucial for resistance.
- Resistance expression is heterogeneous and influenced by multiple genetic factors.
Purpose of the Study:
- To elucidate the genetic basis of methicillin resistance heterogeneity in staphylococci.
- To understand the role of PBP2a and other chromosomal genes in resistance mechanisms.
Main Methods:
- Analysis of the mecA gene and its encoded PBP2a protein.
- Investigation of the contribution of fem and aux genes to resistance.
- Comparative genomics of resistant and susceptible staphylococcal strains.
Main Results:
- Identification of PBP2a as a key determinant of methicillin resistance.
- Demonstration that fem and aux genes modulate PBP2a expression and activity.
- Characterization of the genetic interplay governing resistance levels.
Conclusions:
- PBP2a, encoded by mecA, is essential for methicillin resistance in staphylococci.
- Chromosomal genes, including fem and aux, play a critical role in the heterogeneous expression of methicillin resistance.
- Understanding these genetic mechanisms is vital for developing strategies to combat antibiotic resistance.