Molecular Epidemiology and Genomics of Methicillin-Resistant Staphylococcus aureus
Summary
Molecular epidemiology and genomics of methicillin-resistant Staphylococcus aureus (MRSA) integrate high-resolution sequencing and advanced bioinformatic analysis to trace the origins, spread and evolution of resistant clones. Whole-genome sequencing (WGS) has revealed extensive genetic diversity among MRSA populations, driven by the acquisition of staphylococcal cassette chromosome mec (SCCmec) elements that carry the mecA gene and confer methicillin resistance. Multilocus sequence typing (MLST) and single nucleotide polymorphism (SNP) profiling define clonal complexes that circulate in hospitals, communities and livestock. Comparative genomics has illuminated patterns of horizontal gene transfer, chromosomal reassortment and the emergence of novel lineages in wildlife reservoirs. A One Health perspective highlights bidirectional transmission between animals and humans, underscoring the need for integrated surveillance across clinical, agricultural and environmental settings. Genomic epidemiology informs infection control by pinpointing outbreak sources, mapping regional dissemination and guiding the development of molecular diagnostics and targeted interventions.
Research from Nature Portfolio
Recent studies have demonstrated that methicillin resistance predates clinical antibiotic use, originating in European hedgehogs colonised by a dermatophyte that produces natural β-lactam antibiotics. Genomic analysis of hedgehog-associated Staphylococcus aureus lineages revealed that mecA-carrying clones circulated in wild populations long before the antibiotic era and later spread to livestock and humans. These findings reshape our understanding of resistance evolution by identifying a natural selective environment and emphasising ecological connectivity. The work underscores the importance of a One Health framework for anticipating the emergence of resistance determinants and tailoring global surveillance strategies.
Molecular Epidemiology and Genomics of Methicillin-Resistant Staphylococcus aureus publication trend
The graph below shows the total number of articles in molecular epidemiology and genomics of methicillin-resistant staphylococcus aureus across all publications each year (not limited to Nature Index journals).
Technical terms
Whole-genome sequencing (WGS): High-throughput determination of the complete DNA sequence of an organism’s genome, enabling detailed comparison of genetic variation.
Staphylococcal cassette chromosome mec (SCCmec): A mobile genetic element in Staphylococcus aureus that carries the mecA gene and regulatory regions conferring methicillin resistance.
mecA gene: A gene encoding an altered penicillin-binding protein (PBP2a) with reduced affinity for β-lactam antibiotics, responsible for methicillin resistance.
Multilocus sequence typing (MLST): A genotyping method that sequences internal fragments of multiple housekeeping genes to assign isolates to sequence types and clonal complexes.
Single nucleotide polymorphism (SNP): A single base-pair variation in the genome used as a high-resolution marker for phylogenetic and epidemiological analysis.
One Health: An integrated approach recognising the interconnection of human, animal and environmental health in the emergence and control of infectious diseases.
References
- Historic methicillin-resistant Staphylococcus aureus: expanding current knowledge using molecular epidemiological characterization of a Swiss legacy collection. Genome Medicine (2024).
- SCCmecFinder, a Web-Based Tool for Typing of Staphylococcal Cassette Chromosome mec in Staphylococcus aureus Using Whole-Genome Sequence Data. mSphere (2018).
- Whole genome sequencing identifies zoonotic transmission of MRSA isolates with the novel mecA homologue mecC. EMBO Molecular Medicine (2013).
- Emergence of methicillin resistance predates the clinical use of antibiotics. Nature (2022).
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