Project description:The emerging foodborne pathogen, Aeromonas hydrophila, co-infects humans and animals, especially fish, threatening aquacultural production and public health. Previously we found that Scatophagus argus, a widely cultivated fish species with high economic value, exhibited enhanced growth but increased susceptibility to A. hydrophila infection under freshwater conditions compared to seawater conditions. However, the exact mechanisms involved remain unclear.Our study demonstrated that enhanced virulence of A. hydrophila 201416 isolated from S. argus induced by increasing salinity was associated with altered quorum sensing-related gene expression and regulated behaviors. Results from virulence assays combining phenotypic characterization indicated that increased salinity (from 0 to 35 g/L NaCl) impeded Ah201416 infection of S. argus, a trend aligning with increased biofilm mass and swimming motility, but opposite to bacterial growth. RNA-sequencing and quantitative reverse transcriptional PCR analysis confirmed significant upregulation of genes related to flagellar assembly (flgB, flgH, flgC, flgI, flhA, and fliA), bacterial secretion (HlyD and Ahh1), and quorum sensing (AhyR, LuxO, and LuxE) of Ah201416 in response to elevated salinity. These findings suggested that increased salinity not merely enhanced the virulence of Ah201416 but bolstered the resistance of S. argus, thereby mitigating its susceptibility. This study provides further insights into the microbial risks associated with A. hydrophila in aquacultural production, which is critical to developing appropriate prevention and control strategies and ensuring safe seafood supply.
Project description:Land cover change has long been recognized that marked effect the amount of soil organic carbon. However, little is known about microbial-mediated effect processes and mechanism on soil organic carbon. In this study, the soil samples in a degenerated succession from alpine meadow to alpine steppe meadow in Qinghai-Tibetan Plateau degenerated, were analyzed by using GeoChip functional gene arrays.
Project description:We compared the eggshell proteome of the crocodile lizard (Shinisaurus crocodilurus) to the oviparous Mongolia racerunner (Eremias argus).
Project description:Using WGBS we investigated blood DNA methylation profiles of Cooinda the Alpine dingo and determined putative regulatory elements (unmethylated regions, UMRs, and lowly methylated regions, LMRs).