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Molecular Insights into Carbapenem Resistance in Klebsiella pneumoniae: From Mobile Genetic Elements to Precision Diagnostics and Infection Control
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Molecular Insights into Carbapenem Resistance in Klebsiella pneumoniae: From Mobile Genetic Elements to Precision Diagnostics and Infection Control
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Journal Article
Molecular Insights into Carbapenem Resistance in Klebsiella pneumoniae: From Mobile Genetic Elements to Precision Diagnostics and Infection Control
2026
Overview
Carbapenem-resistant Klebsiella pneumoniae (CRKP) has become one of the most serious problems confronting modern healthcare, particularly in intensive care units where patients are highly susceptible, procedures are frequent, and antibiotic exposure is often prolonged. In this review, carbapenem resistance in K. pneumoniae is presented not as a fixed feature of individual bacteria, but as a process that is constantly changing and closely interconnected. We bring together evidence showing how the spread of successful bacterial lineages, the exchange of resistance genes, and gradual genetic adjustment combine to drive both the rapid spread and the long-lasting presence of resistance. A major focus is placed on mobile genetic elements, including commonly encountered plasmid backbones, transposons, and insertion sequences that carry carbapenemase genes such as blaKPC, blaNDM, and blaOXA-48-like. These elements allow resistance genes to move easily between bacteria and across different biological environments. The human gut plays a particularly important role in this process. Its microbial community serves as a largely unseen reservoir where resistance genes can circulate and accumulate well before infection becomes clinically apparent, making prevention and control more difficult. This review also discusses the key biological factors that shape resistance levels, including carbapenemase production, changes in the bacterial cell membrane, and systems that expel antibiotics from the cell, and explains how these features work together. Advances in molecular testing have made it possible to identify resistance more quickly, supporting earlier clinical decisions and infection control measures. Even so, current tests remain limited by narrow targets and may miss low-level carriage, hidden genetic reservoirs, or newly emerging resistance patterns. Finally, we look ahead to approaches that move beyond detection alone, emphasizing the need for integrated surveillance, thoughtful antibiotic use, and coordinated system-wide strategies to lessen the impact of CRKP.
Publisher
MDPI AG,Multidisciplinary Digital Publishing Institute (MDPI)
Subject
/ Anti-Bacterial Agents - pharmacology
/ Bacterial Proteins - genetics
/ Carbapenem-Resistant Enterobacteriaceae - drug effects
/ Carbapenem-Resistant Enterobacteriaceae - genetics
/ Cloning
/ Costs
/ Drug Resistance, Bacterial - genetics
/ Genes
/ Humans
/ Interspersed Repetitive Sequences
/ Klebsiella Infections - diagnosis
/ Klebsiella Infections - drug therapy
/ Klebsiella Infections - microbiology
/ Klebsiella pneumoniae - drug effects
/ Klebsiella pneumoniae - genetics
/ Mutation
/ Plasmids
/ Review
