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Salmonella enterica

ABSTRACT: Genomic Characterization of Environmental Salmonella from the Shenandoah Valley of Virginia

PROVIDER: PRJNA605356 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR12185267_1.fastq.gz	Fastqsanger.gz
	SRR12185267_2.fastq.gz	Fastqsanger.gz
	SRR12185268_1.fastq.gz	Fastqsanger.gz
	SRR12185268_2.fastq.gz	Fastqsanger.gz
	SRR12185269_1.fastq.gz	Fastqsanger.gz

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The role of Salmonella Genomic Island 4 in metal tolerance of Salmonella enterica serovar I 4,[5],12:i:- pork outbreak isolate USDA15WA-1

Project description:Multidrug-resistant (MDR; resistance to >3 antimicrobial classes) Salmonella enterica serovar I 4,[5],12:i:- strains were linked to a 2015 foodborne outbreak from pork. Strain USDA15WA-1, associated with the outbreak, harbors an MDR module and the metal tolerance element Salmonella Genomic Island 4 (SGI-4). Characterization of SGI-4 revealed that conjugational transfer of SGI-4 resulted in the mobile genetic element (MGE) replicating as a plasmid or integrating into the chromosome. Tolerance to copper, arsenic, and antimony compounds was increased in Salmonella strains containing SGI-4 compared to strains lacking the MGE. Following Salmonella exposure to copper, RNA-seq transcriptional analysis demonstrated significant differential expression of diverse genes and pathways, including induction of numerous metal tolerance genes (copper, arsenic, silver, and mercury). Evaluation of swine administered elevated concentrations of zinc oxide (2,000 mg/kg) and copper sulfate (200 mg/kg) as an antimicrobial feed additive (Zn+Cu) in their diet for 4 weeks prior to and 3 weeks post-inoculation with serovar I 4,[5],12:i:- indicated that Salmonella shedding levels declined at a slower rate in pigs receiving in-feed Zn+Cu compared to control pigs (no Zn+Cu). The presence of metal tolerance genes in MDR Salmonella serovar I 4,[5],12:i:- may provide benefits for environmental survival or swine colonization in metal-containing settings.

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Genomic comparison of Salmonella enterica serovars and Salmonella bongori

Project description:This experiment set includes 64 arrays representing 26 serovars and strains of Salmonella spp. including many representatives of subspecies I, Arizona from subsp. IIIa, and S. bongori from subsp. V. The genomic DNA from all strains were labeled with Cy5 and hybridized against an equal amount (1.5 ug) of S. typhimurium SL1344 reference genomic DNA that was labeled with Cy3, all on an S. typhimurium SL1344 spotted DNA microarray. Most of the arrays are present in triplicate to account for variability in probe generation, hybridization, and slide quality. Several are represented in duplicate, and a few without any replicates. Set of arrays organized by shared biological context, such as organism, tumors types, processes, etc. Keywords: Logical Set

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Dendritic cells infected with Salmonella enterica

Project description:Salmonella enterica causes serious global burden of morbidity and mortality and is a major cause of infant bacteremia in sub Saharan Africa. Diseases caused by Salmonella are treatable with antibiotics but successful antibiotic treatment has become difficult due to antimicrobial resistance. An effective vaccine together with public health effort may therefore be a better strategy to control these infections. Protective immunity against Salmonella depends primarily on T cell-mediated immune responses and therefore identifying relevant T cell antigens is necessary for Salmonella vaccine development. Our laboratory has used an immunoproteomics approach to identify Chlamydia T cell antigens that exhibited significant protection against Chlamydia infection in mice. In this study, we infected murine bone marrow derived dendritic cells from C57BL/6 mice with Salmonella enterica strain SL1344 followed by isolation of MHC class I and II- molecules and elution of bound peptides. The sequences of the peptides were then identified using tandem mass spectrometry. We identified 87 MHC class II and 23 MHC class I Salmonella derived peptides. Four of 12 peptides stimulated IFN-? production by CD4 T cells from the spleens of mice with persistent Salmonella infection. These antigens will be useful for Salmonella immunobiology research and are potential Salmonella vaccine candidates.

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