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• W13025488 abstract "The aim of these studies continues to be the investigation into the molecular mechanisms that underlie the virulence process in Yersinia pestis. In particular, the focus of this work centers on the identification of novel genes and pathways responsible for the pathogenic properties of this organism. In spite of more than four decades of intense investigation in this field, the dilemma as to what makes Y. pestis such a virulent and lethal pathogen remains unanswered. The method being employed makes use microarray technology (DNA chip) that enables the examination of the global activities of the whole complement of genes in this pathogen. Two primary resources available to the investigators (one directly obtained from a separate CBNP-funded project) make these studies possible: (1) Whole genome comparisons of the genes in Y. pestis and its near neighbors with attenuated or non pathogenic characteristics, and (2) the ability to duplicate in vitro, conditions that mimic the infection process of this pathogen. This year we have extended our studies from the original work of characterizing the global transcriptional regulation in Y. pestis triggered during temperature transition from 26 C to 37 C (roughly conditions found in the flea vector and the mammalian host, respectively) to studies of regulation encountered during shift between growth from conditions of neutral pH to acidic pH (the latter conditions, those mimic the environment found inside macrophages, a likely environment found by these cells during infection.). For this work, DNA arrays containing some 5,000 genes (the entire genome of Y. pestis plus those genes found uniquely in the enteropathogen, and near neighbor, Y. pseudotuberculosis) are used to monitor the simultaneous expression levels of each gene of known and unknown function in Y. pestis. Those genes that are up-regulate under the experimental conditions represent genes potentially involved in the pathogenic process. The ultimate role in pathogenicity of those candidate genes uncovered from these studies will be further ascertained by direct knock outs (gene inactivation) and by in vivo studies using an animal model. Discovery of new virulence factors in Y. pestis will directly impact the development of new signatures for detection and geo-location since it will help us to understand and identify those genes that are essential in making the organism pathogenic. These are genes that cannot be altered or removed from the pathogen and as such constitute the best type of signature that we can utilize in their detection and identification. Applications such as this will also enable the utilization of similar technologies to study other pathogens such as Francisella and Brucella, for which we know substantially less in terms of their modality of virulence." @default.
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• W13025488 date "2002-10-15" @default.
• W13025488 modified "2023-09-26" @default.
• W13025488 title "Global Expression Studies of Yersinia Pestis Pathogenicity" @default.
• W13025488 doi "https://doi.org/10.2172/15002520" @default.
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