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Molecular Approaches for the Characterization of Foodborne Pathogens in Poultry


<p>1. Utilize genomic, proteomic, and phenotype approaches to improve characterization of foodborne pathogens. 1a. Apply several molecular technologies to further characterize genomic variability of C. jejuni isolates. 1b. Optimize phenotype microarray technology for Campylobacter spp. 1c. Perform proteomic comparisons on the 5 genetically diverse C. jejuni isolates employed in aforementioned genomic characterization investigations (Objective 1: Sub-Objective 1a: C) so as to increase our basic knowledge of differential protein expression. 1d. Perform metagenomic/microbial ecology analyses on chicken gastrointestinal material to increase our basic knowledge of the microbial ecology of the broiler chicken gut. 1e. Develop a database on Campylobacter spp., containing molecular, phylogenetic, proteomic, metabalomic, epidemiologic, and metadata information.</p> <p>2. Develop, refine, and implement improved methods for the cultural recovery of Campylobacter spp, and potential emerging foodborne pathogens, specifically as it meets regulatory and public health needs. 2a. Utilize genomic, phenotypic, and in silico metabolic reconstruction technologies to develop improved media for isolation of C. jejuni. 2b. Compare existing and newly refined media for recovery of C. jejuni and emerging Campylobacter spp. from the poultry farm environment as well as recovery of isolates most likely involved in public exposure.</p> <p>3. Using a systems approach, compare Campylobacter spp. with varied colonization abilities for the identification of potential genes or proteins involved in colonization, virulence, and gene expression. 3a. Compare C. jejuni isolates that vary in their ability to colonize broiler chickens, for the identification of genes, proteins, and phenotypes involved in colonization. 3b. Compare C. jejuni isolates that vary in their levels of eukaryotic cell (Caco-2) adherence and invasion for the identification of genes, proteins, and phenotypes involved in virulence.</p>

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Improved understanding of mechanisms used during poultry colonization as well as defining the impact of applied interventions on Campylobacter spp. and associated chicken microflora is a high priority. The approaches of this project are to 1) further define novel regions in the Campylobacter spp. genome; 2) define colonization mechanisms by comparing Campylobacter spp. isolates exhibiting varying degrees of colonization in chickens; and 3) refine media components and methods for culture based recovery of Campylobacter spp. Our approach follows a coordinate driven model incorporating a comprehensive and multidisciplinary (systems biology) strategy that combines pathogen genomics, proteomics, metabolomics, and metagenomics. The overall impact of this research is to obtain information so as to provide scientifically sound guidance to assist the development of intervention strategies against Campylobacter spp. during broiler production. This should positively impact public health, with a concurrent understanding of the mechanisms and the long-term consequences of intervention application.

Seal, Bruce; Line, John; Hiett, Kelli
USDA - Agricultural Research Service
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