Related Experiment Video
Updated: Feb 11, 2026

Production of Chemicals by Klebsiella pneumoniae Using Bamboo Hydrolysate as Feedstock
Published on: June 29, 2017
Decoding Hypervirulence in Carbapenem-Resistant Klebsiella pneumoniae: Genomic and Phenotypic Profiling Reveals
Li Xu1, Jiayang Li2, Wenqi Wu2
1Jinling Clinical Medical College, Nanjing Medical University, Nanjing, China.
Background:
The global dissemination of hypervirulent carbapenem-resistant Klebsiella pneumoniae (hv-CRKP) poses escalating threats to public health. Substantial controversy persists regarding its true virulence potential, highlighting the need for reliable biomarkers to enable early diagnosis and targeted therapy.
Methods:
Using a mouse subcutaneous challenge model, we characterized 59 carbapenem-resistant K. pneumoniae (CRKP) isolates, identifying 37.29% (22/59) as convergent hv-CRKP. Phenotypic and genotypic characterization, integrated with genome-wide association study (GWAS) and transcriptomic analysis, was performed, and reliable biomarkers for accurate hv-CRKP detection were identified.
Results:
Patients infected with hv-CRKP exhibited significantly higher sepsis incidence (P = .028) and increased mortality. Capsule production and hypermucoviscosity robustly discriminated hv-CRKP from CRKP. GWAS analysis revealed that chromosomally encoded factors, independent of plasmid-borne elements, critically contribute to hypervirulence. Transcriptomics revealed rcsA-mediated capsule upregulation enhances macrophage phagocytosis resistance and bacterial survival, revealing a pivotal pathogenic mechanism. Both multivariable logistic regression and LASSO regression confirmed capsule production and rcsA expression as independent and robust diagnostic biomarkers to accurately assess virulence potential in carbapenem-resistant strains.
Conclusions:
We conclude that clinical application of the term "hv-CRKP" requires prudent validation and emphasize the urgency of developing biomarkers to precisely identify truly hypervirulent CRKP strains.
Related Concept Videos
Biosynthesis of Polysaccharides
Genomics
Genomic Imprinting and Inheritance
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
Cellulose and Pectic Polysaccharides
As a cell matures, its cell wall specializes according to its type. For example, the...
Key Techniques in Microbiology
Pneumonia I: Introduction
Risk Factors
Various factors influence the likelihood of developing pneumonia. Age plays a crucial role, with infants, children under two, and individuals over 65 at increased risk due to their...

