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Thomson, N.R.; Clayton, D.J.; Windhorst, D.; Vernikos, G.; Davidson, S.; Churcher, C.; Quail, M.A.; Stevens, Mark; Jones, M.A.; Watson, M.; Barron, A.; Layton, A.; Pickard, D.; Kingsley, R.A.; Bignell, A.; Clark, L.; Harris, B.; Ormond, D.; Abdellah, Z.; Brooks, K.; Cherevach, I.; Chillingworth, T.; Woodward, J.; Norberczak, H.; Lord, A.; Arrowsmith, C.; Jagels, K.; Moule, S.; Mungall, K.; Sanders, M. ... view all 38 authors View less authors (2008)
Publisher: Cold Spring Harbor Laboratory Press
Types: Article
Subjects: QR, Letter, QH426, enterica serovar typhimurium escherichia-coli pathogenicity islands sequence-analysis identification genes gallinarum infection virulence dna
We have determined the complete genome sequences of a host-promiscuous Salmonella enterica serovar Enteritidis PT4 isolate P125109 and a chicken-restricted Salmonella enterica serovar Gallinarum isolate 287/91. Genome comparisons between these and other Salmonella isolates indicate that S. Gallinarum 287/ 91 is a recently evolved descendent of S. Enteritidis. Significantly, the genome of S. Gallinarum has undergone extensive degradation through deletion and pseudogene formation. Comparison of the pseudogenes in S. Gallinarum with those identified previously in other host-adapted bacteria reveals the loss of many common functional traits and provides insights into possible mechanisms of host and tissue adaptation. We propose that experimental analysis in chickens and mice of S. Enteritidis-harboring mutations in functional homologs of the pseudogenes present in S. Gallinarum could provide an experimentally tractable route toward unraveling the genetic basis of host adaptation in S. enterica.
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