Coagulase-Negative Staphylococci Pathogenesis and Antibiotic Resistance

Coagulase-Negative Staphylococci (CoNS) represent a diverse group of skin commensal bacteria that have emerged as important opportunistic pathogens, particularly in nosocomial and device‐associated infections. Although historically considered benign, species such as S. epidermidis, S. haemolyticus and S. lugdunensis are now recognised for their capacity to form biofilms on medical implants, evade host immunity and exchange antibiotic‐resistance determinants. Central to their pathogenicity is the staphylococcal cassette chromosome mec (SCCmec), which carries the mecA gene conferring methicillin resistance and can be mobilised across species through horizontal gene transfer. Recent advances in genomic sequencing have uncovered the complexity of virulence factors including adhesins, enzymes and quorum sensing systems, and revealed genetic hotspots that facilitate recombination. The global distribution of multidrug‐resistant CoNS strains underscores their role as reservoirs of resistance genes, with significant implications for therapeutic strategies and infection control. A more nuanced understanding of CoNS ecology, molecular mechanisms of resistance and interspecies gene flow is essential for the development of targeted antimicrobials and preventative measures.

Research from Nature Portfolio

Recent studies have illuminated the structured patterns of gene exchange among co‐circulating CoNS lineages. Genomic analyses of isolates from diverse animal hosts demonstrated that specific lineages act as hubs for phages, plasmids and mobilisable resistance and virulence genes, overcoming ecological barriers to horizontal transfer. Frequent recombination events were detected irrespective of host species, revealing that ecological overlap and geographical proximity drive the dissemination of antibiotic‐resistance elements. These findings provide a refined map of the evolutionary networks that underpin CoNS pathogenicity and resistance spread.

Coagulase-Negative Staphylococci Pathogenesis and Antibiotic Resistance publication trend

The graph below shows the total number of articles in coagulase-negative staphylococci pathogenesis and antibiotic resistance across all publications each year (not limited to Nature Index journals).

Technical terms

Coagulase-Negative Staphylococci (CoNS): A group of staphylococcal species that do not produce the enzyme coagulase and are common skin commensals and opportunistic pathogens.

Staphylococcal Cassette Chromosome mec (SCCmec): A mobile genetic element carrying the mecA gene that confers methicillin resistance and can integrate into the staphylococcal chromosome.

mecA gene: The gene encoding penicillin‐binding protein PBP2a, which mediates resistance to methicillin and other β‐lactam antibiotics.

Horizontal gene transfer: The movement of genetic material between organisms by means other than traditional reproduction, facilitating the spread of resistance genes.

Biofilm: A structured community of bacterial cells encased in a self‐produced extracellular matrix, enhancing adherence and tolerance to antibiotics and host defences.

References

1. Leaky barriers to gene sharing between locally co-existing coagulase-negative Staphylococcus species. Communications Biology (2023).
2. Current types of staphylococcal cassette chromosome mec (SCCmec) in clinically relevant coagulase-negative staphylococcal (CoNS) species. Critical Reviews in Microbiology (2023).
3. A Comprehensive Study on Antibiotic Resistance among Coagulase-Negative Staphylococci (CoNS) Strains Isolated from Ready-to-Eat Food Served in Bars and Restaurants. Foods (2023).