Project description:Salmonella Heidelberg is currently the 9th common serovar and has more than twice the average incidence of blood infections in Salmonella. A recent Salmonella Heidelberg outbreak in chicken infected 634 people during 2013-2014, with a hospitalization rate of 38% and an invasive illness rate of 15%. While the company’s history suggested longstanding sanitation issues, the strains’ characteristics which may have contributed to the outbreak are unknown. We hypothesized that the outbreak strains of S. Heidelberg might possess enhanced stress tolerance or virulence capabilities. Consequently, we obtained nine food isolates collected during the outbreak investigation and several reference isolates and tested their tolerance to processing stresses, their ability to form biofilms, and their invasiveness in vitro. We further performed RNA-sequencing on three isolates with varying heat tolerance to determine the mechanism behind our isolates’ enhanced heat tolerance. Ultimately, we determined that (i) many Salmonella Heidelberg isolates associated with a foodborne outbreak have enhanced heat resistance (ii) Salmonella Heidelberg outbreak isolates have enhanced biofilm-forming ability under stressful conditions, compared to the reference strain (iii) exposure to heat stress may also increase Salmonella Heidelberg isolates’ antibiotic resistance and virulence capabilities and (iv) Salmonella Heidelberg outbreak-associated isolates are primed to better survive stress and cause illness. This data helps explain the severity and scope of the outbreak these isolates are associated with and can be used to inform regulatory decisions on Salmonella in poultry and to develop assays to screen isolates for stress tolerance and likelihood of causing severe illness.
Project description:A comparative proteomics analysis on AAL toxin treated jai1 mutant and its wild type revealed that JA pathway promoted AAL toxin induced PCD by regulating the relevant PCD components and/or through other hormone pathways in a SlCOI1 dependent manner.</br></br>Additional contact: <a href="mailto:xixizhangmin@123.com" target="_top">Min Zhang</a>, Zhejiang University.
Project description:BM samples were collected from two adult healthy donors and two AA patients at the first hospital affiliated from Zhejiang Chinese University. Mononuclear cells (MNCs) were isolated using Ficoll-Hypaque gradient separation. CD34+ cells were purified from MNCs with the human anti-CD34 MicroBeads Isolation kit according to the manufactures specifications. Isolated cell was the purification of CD34+ cell. Then, MNCs mixed with CD34+ cells at 4:1 ratio and were analyzed by 10×Genomics.
2021-08-15 | GSE181989 | GEO
Project description:Salmonella Telelkebir from CATG of ZJU
| PRJNA666303 | ENA
Project description:Listeria monocytogenes isolates from CATG ZJU