Molecular Characterization of Methicillin-Resistant Staphylococcus aureus
Summary
Methicillin-resistant Staphylococcus aureus (MRSA) remains a leading cause of healthcare- and community-associated infections worldwide. Molecular characterisation of MRSA hinges on identifying the mecA gene, which encodes an altered penicillin-binding protein (PBP2a) within a mobile genetic element known as the staphylococcal cassette chromosome mec (SCCmec). Typing schemes such as multilocus sequence typing (MLST), spa typing and SCCmec subtyping have revealed a limited number of pandemic clonal complexes (notably CC8, CC22 and CC30), each associated with distinct resistance and virulence profiles. Whole-genome sequencing has further delineated the accessory genome that governs toxin production, biofilm formation and environmental persistence. Integration of these approaches underpins surveillance, guides infection control and informs the development of novel therapeutic and diagnostic strategies. The global significance of MRSA lies not only in its capacity to acquire additional resistance determinants but also in its propensity to cause outbreaks across hospital, community and environmental settings.
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Molecular Characterization of Methicillin-Resistant Staphylococcus aureus publication trend
The graph below shows the total number of articles in molecular characterization of methicillin-resistant staphylococcus aureus across all publications each year (not limited to Nature Index journals).
Technical terms
SCCmec: A mobile genetic element carrying mecA that confers methicillin resistance.
mecA: Gene encoding penicillin-binding protein PBP2a, reducing affinity for β-lactam antibiotics.
Multilocus sequence typing (MLST): A method that assigns sequence types based on housekeeping gene alleles.
spa typing: Sequencing of the protein A gene’s variable X region to classify S. aureus strains.
Panton-Valentine leukocidin (PVL): A toxin associated with severe skin and soft tissue infections.
References
- Emerging Challenges in Staphylococcus aureus Bloodstream Infections: Insights from Coagulase Typing, Toxin Genes, and Antibiotic Resistance Patterns. Advances in Medicine (2023).
- The Prevalence of the Virulence Genes of Staphylococcus aureus in Sickle Cell Disease Patients at KSUMC, Riyadh, Saudi Arabia. Antibiotics (2023).
- Distribution of the Most Prevalent Spa Types among Clinical Isolates of Methicillin-Resistant and -Susceptible Staphylococcus aureus around the World: A Review. Frontiers in Microbiology (2018).
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