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A survey of a complete gene synteny comparison has been carried out between twenty fully sequenced strains from the genus  Escherichia  with the aim of finding yet uncharacterised genes implicated in the metabolism of uropathogenic strains of  E. coli  (UPEC). Several sets of adjacent colinear genes have been identified which are present in all four UPEC included in this study (CFT073, F11, UTI89, and 536), annotated with putative metabolic functions, but are not found in any other strains considered. An operon closely homologous to that encoding the L-sorbose degradation pathway in  Klebsiella pneumoniae  has been identified in  E. coli  CFT073; this operon is present in all of the UPEC considered, but only in 7 of the other 16 strains. The operon's function has been confirmed by cloning the genes into  E. coli  DH5 α  and testing for growth on L-sorbose. The functional genomic approach combining in silico and in vitro work presented here can be used as a basis for the discovery of other uncharacterised genes contributing to bacterial survival in specific environments.

comparative and functional genomics

The Analysis of Multiple Genome Comparisons in Genus<i>Escherichia</i>and Its Application to the Discovery of Uncharacterised Metabolic Genes in Uropathogenic<i>Escherichia coli</i>CFT073

The Analysis of Multiple Genome Comparisons in GenusEscherichiaand Its Application to the Discovery of Uncharacterised Metabolic Genes in UropathogenicEscherichia coliCFT073