Plasmid-Mediated Antibiotic Resistance in Clinical Bacteria

Plasmids are extrachromosomal DNA elements that play a pivotal role in the dissemination of antibiotic resistance among clinical bacterial pathogens. These mobile genetic platforms frequently carry genes encoding extended-spectrum β-lactamases, carbapenemases and other resistance determinants, which can be rapidly exchanged between strains and species via conjugation and other mechanisms of horizontal gene transfer. In healthcare settings, plasmid-borne resistance has been implicated in the emergence of high-risk clones of Escherichia coli, Klebsiella pneumoniae and other Enterobacterales, undermining last-resort therapies and fuelling outbreaks. Advances in high-resolution genomics and single-molecule mapping have illuminated the structure, transfer dynamics and evolutionary trajectories of resistance plasmids, revealing complex mosaics of transposons, insertion sequences and integrative elements. Globally, surveillance efforts have documented the displacement of older epidemic lineages by plasmid-rich clones carrying blaNDM, blaKPC or blaOXA variants. Practical applications of these insights include targeted infection control measures, plasmid-focused diagnostics and the design of inhibitors that destabilise conjugative machinery. The interplay between plasmid ecology, host adaptation and antimicrobial use underscores the urgent need for coordinated research and policy interventions to curb the spread of plasmid-mediated resistance.

Research from Nature Portfolio

Recent studies have mapped the global rise of carbapenem-resistant E. coli sequence type 410, identifying a hypervirulent B5/H24RxC subclone that carries an F-type plasmid encoding the blaNDM-5 gene. Genomic analysis demonstrated that this clone has disseminated across multiple continents, replacing earlier lineages and acquiring pathogenicity islands that enhance both resistance and virulence. In parallel, large-scale epidemiological work has charted the shifting spatiotemporal patterns of carbapenemase genes among nearly 8 000 clinical isolates from 75 countries. This analysis revealed successive waves of blaNDM-5, blaKPC-2 and blaOXA-48 spread on IncFII, IncFI and IncI plasmid backbones, with distinct transmission hubs identified in Europe, Asia and North America. Complementary advances in single-molecule optical DNA mapping have enabled strain-level typing and concurrent plasmid characterisation directly from clinical samples, achieving high accuracy without prior culture. This method has demonstrated the feasibility of coupling Cas9-targeted cleavage with nanofluidic mapping to pinpoint the plasmid context of resistance genes, paving the way for rapid, culture-free diagnostics in polymicrobial infections.

Plasmid-Mediated Antibiotic Resistance in Clinical Bacteria publication trend

The graph below shows the total number of articles in plasmid-mediated antibiotic resistance in clinical bacteria across all publications each year (not limited to Nature Index journals).

Technical terms

Plasmid: A self-replicating, extrachromosomal DNA molecule that can carry resistance genes.

Conjugation: A mechanism of horizontal gene transfer involving direct cell-to-cell DNA transfer.

Extended-spectrum β-lactamase (ESBL): An enzyme that confers resistance to third-generation cephalosporins.

Carbapenemase: A β-lactamase enzyme capable of hydrolysing carbapenem antibiotics.

Integrative and conjugative element (ICE): A DNA segment that integrates into the chromosome and can excise for conjugative transfer.

Transposon: A mobile DNA sequence capable of moving within and between DNA molecules.

Optical DNA mapping: A single-molecule technique that visualises DNA barcodes to identify genomic structures.

High-risk clone: A bacterial lineage associated with widespread antibiotic resistance and global dissemination.

References

1. Global emergence of a hypervirulent carbapenem-resistant Escherichia coli ST410 clone. Nature Communications (2024).
2. ICEberg 3.0: functional categorization and analysis of the integrative and conjugative elements in bacteria. Nucleic Acids Research (2023).
3. Strain-level bacterial typing directly from patient samples using optical DNA mapping. Communications Medicine (2023).
4. Carbapenem-resistant Escherichia coli exhibit diverse spatiotemporal epidemiological characteristics across the globe. Communications Biology (2024).
5. Escherichia coli Sequence Type 410 Is Causing New International High-Risk Clones. mSphere (2018).
6. Genomic Epidemiology of Global Carbapenemase-Producing Escherichia coli, 2015–2017 - Volume 28, Number 5—May 2022 - Emerging Infectious Diseases journal - CDC. Emerging Infectious Diseases (2022).