Project description:This study examines the transcriptomic response of biofilms of the PAH-degrading Sphingomonas sp. LH128 on solute stress when actively degrading and growing on the PAH compound. To address the effect of solute stress on bacterial physiology and transcriptomic response, NaCl was used as osmolyte. Both acute and chronic solute stress was invoked to assess differences in short-term and long-term responses.
Project description:We report the differential expression of a PAH degrading bacterium in different states of substrate induction. Separate substrate cultivation of the same batch of bacterial isolates; total RNA extraction, processing and sequencing; gene expression analysis using bioinformatics softwares and experimental validation using qRT-PCR.
Project description:Filamentous fungi are widely used in the production of biomass degrading enzymes, e.g. cellulases and pectinases. In order to study the secretome of biomass degrading fungi, proteomics studies were carried out on the extracellular proteins of fungal strains.
Project description:This study examines the transcriptomic response of biofilms of the PAH-degrading Sphingomonas sp. LH128 on solute stress when actively degrading and growing on the PAH compound. To address the effect of solute stress on bacterial physiology and transcriptomic response, NaCl was used as osmolyte. Both acute and chronic solute stress was invoked to assess differences in short-term and long-term responses. Transcriptomic response of phenanthrene degrading Sphingomonas sp. LH128 biofilms as a response to short-term and long-term solute (NaCl) stress was studied using genome-wide gene expression analysis. For this purpose, the strain was grown in customized continuous glass flow chambers that contain solid phenanthrene as a sole carbon source and that allow easy recovery of biofilm cells for transcriptomic and physiological analysis. A NaCl stress of 450 mM was imposed on LH128 biofilms growing on phenanthrene crystals coated on glass slides either for 4 hours (acute stress) or for 3 days (chronic stress). RNA was extracted from the biofilm and cDNA was synthesized and labeled with Cy3. Transcriptomic response in the stressed biofilms of three replicates per conditions were analyzed and compared with non-stressed
Project description:<p>Gut microbiota dysbiosis has been implicated in pulmonary arterial hypertension (PAH). However, most studies have focused on the bacterial community and the exact role and mechanisms of multi-kingdom gut microbiota, including bacteria, archaea and fungi in PAH remains largely unclear. Idiopathic PAH (IPAH) patients exhibited distinct gut microbiota profiles with altered bacterial, archaeal and fungal compositions compared to healthy controls. Fecal microbiota transplantation (FMT) from IPAH patients or monocrotaline (MCT)-induced PAH rats to antibiotic treated rats induced PAH phenotypes, including increased right ventricular systolic pressure (RVSP) and pulmonary vascular remodeling. Conversely, FMT from normal rats to MCT-PAH rats ameliorated PAH symptoms and reversed multi-kingdom gut microbiota dysbiosis. Metabolomics revealed significant alterations in plasma metabolites. Our findings established a causal link between multi-kingdom gut microbiota dysbiosis and PAH, demonstrating the therapeutic potential of FMT in reversing PAH phenotypes. More importantly, in addition to gut bacteria, gut archaeal and fungal communities also significantly correlate with PAH pathogenesis, highlighting their indispensable role in the gut.</p>