Project description:To understand the mechanism by which HLH-26 regulated protection against S. enterica infection after exposure to E. faecium, we used RNA sequencing to focus on transcriptional changes induced by E. faecium in hlh-26(ok1453) compared with wild-type animals.
Project description:Investigation of whole genome gene expression level changes in Lactococcus lactis KCTC 3769T,L. raffinolactis DSM 20443T, L. plantarum DSM 20686T, L. fujiensis JSM 16395T, L. garvieae KCTC 3772T, L. piscium DSM 6634T and L. chungangensis CAU 28T . This proves that transcriptional profiling can facilitate in elucidating the genetic distance between closely related strains.
Project description:Enterococcus faecium has emerged as a major opportunistic pathogen for two decades, with the spread of hospital-adapted multidrug-resistant clones. Members of the intestinal microbiota, they are subjected to numerous bacterial stresses, including antibiotics at subinhibitory concentrations (SICs). Since fluoroquinolones are extensively prescribed, SICs are very likely to occur in vivo with potential effects on bacterial metabolism with subsequent modulation of opportunistic traits. The aim of the study was to evaluate globally the impact of subinhibitory concentrations (SICs) of ciprofloxacin on antimicrobial resistance and pathogenicity of E. faecium. Transcriptomic analysis was performed by RNA-seq (HiSeq 2500, Illumina) using the vanB-positive reference strain E. faecium Aus0004 in the absence or presence of ciprofloxacin SIC (0.38 mg/L, i.e. MIC 1/8). Several genetic and phenotypic tests were used for validation. In the presence of ciprofloxacin SIC, 196 genes were significantly induced whereas 286 were significantly repressed, meaning that 16.8% of the E. faecium genome was altered. Amongst upregulated genes, EFAU004_02294 (fold change of 14.3) encoded a protein (EfmQnr) homologue of Qnr proteins involved in quinolone resistance in Gram-negative bacilli. Its implication in intrinsic and adaptive FQ resistance in E. faecium was experimentally ascertained. Moreover, EFAU004_02292 coding for the collagen adhesin Acm was also induced by SIC of ciprofloxacin (fold change of 8.2), and higher adhesion capabilities were demonstrated phenotypically. Both Efmqnr and Acm determinants may play an important role in the transition from a commensal to a pathogenic state of E. faecium that resides in the gut of patients receiving a fluoroquinolone therapy.
Project description:Investigation of whole genome gene expression level changes in Lactococcus lactis KCTC 3769T,L. raffinolactis DSM 20443T, L. plantarum DSM 20686T, L. fujiensis JSM 16395T, L. garvieae KCTC 3772T, L. piscium DSM 6634T and L. chungangensis CAU 28T . This proves that transcriptional profiling can facilitate in elucidating the genetic distance between closely related strains. A one chip study using total RNA recovered from of L. raffinolactis DSM 20443T, L. plantarum DSM 20686T, L. fujiensis JSM 16395T, L. garvieae KCTC 3772T, L. piscium DSM 6634T and L. chungangensis CAU 28T . For the the transcriptome of of L. raffinolactis DSM 20443T, L. plantarum DSM 20686T, L. fujiensis JSM 16395T, L. garvieae KCTC 3772T, L. piscium DSM 6634T and L. chungangensis CAU 28T was analyzed using the Lactococcus lactis KCTC 3769T microarray platform