Identification of Salmonella gallinarum virulence genes in a chicken infection model using PCR-based signature-tagged mutagenesis

Devendra H. Shah; Mi-Hwa Lee; Jin-ho Park; Ji Hoon Lee; Seong-kug Eo; Jung-thek Kwon; Joon-seok Chae

doi:10.1099/mic.0.28126-0

journal article Dec 01, 2005

Identification of Salmonella gallinarum virulence genes in a chicken infection model using PCR-based signature-tagged mutagenesis

Devendra H. Shah Mi-Hwa Lee Jin-ho Park

Ji Hoon Lee

Seong-kug Eo Jung-thek Kwon Joon-seok Chae

Microbiology Vol. 151 No. 12 pp. 3957-3968 · Microbiology Society

View at Publisher Save 10.1099/mic.0.28126-0

Abstract

Salmonella gallinarum (SG) is a non-motile host-adapted salmonella that causes fowl typhoid, a severe systemic disease responsible for significant economic losses to the poultry industry worldwide. This study describes the application of a PCR-based signature-tagged mutagenesis system to identify in vivo-essential genes of SG. Ninety-six pools representing 1152 SG mutants were screened in a natural-host chicken infection model. Twenty presumptive attenuated mutants were identified and examined further. The identity of the disrupted gene in each mutant was determined by cloning of the DNA sequences adjacent to the transposon, followed by sequencing and comparison with the bacterial genome database. In vitro and in vivo competition indices were determined for each identified mutant and a total of 18 unique, attenuating gene disruptions were identified. These mutations represented six broad genomic classes: Salmonella pathogenicity island-1 (SPI-1), SPI-2, SPI-10, SPI-13, SPI-14 and non-SPI-encoded virulence genes. SPI-13 and SPI-14 are newly identified and designated in this study. Most of the genes identified in this study were not previously believed or known to play a role in the pathogenesis of SG infection in chickens. Each STM identified mutant showed competitiveness and/or virulence defects, confirmed by in vitro and in vivo assays, and challenge tests. This study should contribute to a better understanding of the pathogenic mechanisms involved in progression of disease caused by SG, and identification of novel live vaccine candidates and new potential antibiotic targets.

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Details

Published: Dec 01, 2005
Vol/Issue: 151(12)
Pages: 3957-3968

Authors

D

Devendra H. Shah