A team of researchers from the Hospital Universitario La Paz Research Institute (IdiPAZ, Madrid) and Roche Spain (Barcelona) announced the sequencing of the whole genome of three antibiotic resistant strains of Klebsiella pneunomiae isolated from a recent outbreak in a Spanish hospital. The sequence data, generated using Roche’s 454 GS FLX+ System, is some of the first for this particular bacterial species, providing new insights into how antibiotic resistance evolves within this microorganism and can lead to hospital outbreaks.

Klebsiella pneumoniae is a bacterium frequently found in the mouth and gut of healthy humans. In most instances, it does not lead to disease but it can mutate opportunistically and cause diverse types of infections. The bacterium also has a significant capacity to acquire antibiotic resistance. Three closely related isolates of a pathogenic strain of K. pneumonia with increasing degrees of antibiotic resistance were obtained in the Microbiology department at Hospital Universitario La Paz and sequenced at LifeSequencing in Valencia, Spain, using the long read GS FLX+ System, developed by 454 Life Sciences, a Roche Company. The sequencing data was assembled using the GS De Novo Assembler software and functional annotation was performed to identify the relevant genes codified in the three genomes with BG7, the optimized system developed by Era 7 Bioinformatics, providing rich functional annotation of 454 Sequencing data.

The researchers found that the three bacteria strains showed an increasing resistance pattern to a wide range of the antibiotics most commonly used at the hospital. Comparison of the genomes will give insights regarding how antibiotic resistance evolves within K. pneumonia and will aid in efforts to reduce the increasing prevalence of antibiotic resistance worldwide. In addition, the comparison of these genomes with other previously studied bacteria will help to understand how a microorganism that is part of our normal microbiome can become a dangerous pathogen.

Source: Roche