Enterococcus faecium strain:AA708
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Project description:The outbreak of multispecies of VanA-type vancomycin resistant enterococci (VRE) in Japan
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Project description:This study aims to determine the global gene expression in vancomycin resistant Enterococcus faecium (VRE) in response to a novel essential oil-vancomycin combination, and the individual components (vancomycin, carvacrol and cuminaldehyde) to help determine the mechanism of action of this antimicrobial formulation. This formulation increases the susceptibility of VRE to vancomycin and the array provides data on the synergistic mechanism of action. Five conditions (1. Control; 2. Carvacrol, 1.98 mM; 3. Cuminaldehyde, 4.20 mM; 4. Vancomycin, 0.031 mg/l; 5. Combination, 1.98 mM Carvacrol, 4.2 mM Cuminaldehyde, 0.031 mg/l vancomycin) all with 1% DMSO were tested in triplicate with a 60 minute exposure time before extraction.
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Project description:Enterococci are among the leading causes of hospital-acquired infections in the United States and Europe, with Enterococcus faecalis and Enterococcus faecium being the two most common species isolated from enterococcal infections. In the last decade, the proportion of enterococcal infections caused by E. faecium has steadily increased compared to other Enterococcus species. Although the underlying mechanism for the gradual replacement of E. faecalis by E. faecium in the hospital environment is not yet understood, many studies using genotyping and phylogenetic analysis have shown the emergence of a globally dispersed polyclonal subcluster of E. faecium strains in clinical environments. Systematic study of the molecular epidemiology and pathogenesis of E. faecium has been hindered by the lack of closed, complete E. faecium genomes that can be used as references.In this study, we report the complete genome sequence of the E. faecium strain TX16, also known as DO, which belongs to multilocus sequence type (ST) 18, and was the first E. faecium strain ever sequenced. Whole genome comparison of the TX16 genome with 21 E. faecium draft genomes confirmed that most clinical, outbreak, and hospital-associated (HA) strains (including STs 16, 17, 18, and 78), in addition to strains of non-hospital origin, group in the same clade (referred to as the HA clade) and are evolutionally considerably more closely related to each other by phylogenetic and gene content similarity analyses than to isolates in the community-associated (CA) clade with approximately a 3-4% average nucleotide sequence difference between the two clades at the core genome level. Our study also revealed that many genomic loci in the TX16 genome are unique to the HA clade. 380 ORFs in TX16 are HA-clade specific and antibiotic resistance genes are enriched in HA-clade strains. Mobile elements such as IS16 and transposons were also found almost exclusively in HA strains, as previously reported.Our findings along with other studies show that HA clonal lineages harbor specific genetic elements as well as sequence differences in the core genome which may confer selection advantages over the more heterogeneous CA E. faecium isolates. Which of these differences are important for the success of specific E. faecium lineages in the hospital environment remain(s) to be determined.
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Project description:Enterococcus faecium, traditionally considered a harmless gut commensal, is emerging as an important nosocomial pathogen showing increasing rates of multidrug resistance. We report the draft genome sequence of E. faecium strain LMG 8148, isolated in 1968 from a human in Gothenburg, Sweden. The draft genome has a total length of 2,697,490 bp, a GC-content of 38.3 %, and 2,402 predicted protein-coding sequences. The isolation of this strain predates the emergence of E. faecium as a nosocomial pathogen. Consequently, its genome can be useful in comparative genomic studies investigating the evolution of E. faecium as a pathogen.
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Project description:We report here the draft genome sequence of Enterococcus faecium strain ICIS 18, which was isolated from human feces. Analysis of the E. faecium ICIS 18 genome revealed genes encoding resistance to metals, fluoroquinolones, and beta-lactam antibiotics.
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