Shigella CGH

ABSTRACT: Background Compelling evidence indicates that Shigella species, the etiologic agents of bacillary dysentery, as well as enteroinvasive Escherichia coli, are derived from multiple origins of Escherichia coli and form a single pathovar. To further understand the genome diversity and virulence evolution of Shigella, comparative genomic hybridization microarray analysis was employed to compare the gene content of E. coli K-12 with those of 43 Shigella strains from all serotypes. Results For the 43 strains subjected to CGH microarray analyses, the common backbone of the Shigella genome was estimated to contain more than 1,900 open reading frames, with a mean number of 729 undetectable ORFs. The mosaic distribution of absent regions indicated that insertions and/or deletions have led to the highly diversified genomes of pathogenic strains. Conclusion These results support the hypothesis that by gain and loss of functions, Shigella species became successful human pathogens through convergent evolution from diverse genomic backgrounds. Moreover, we also found many specific differences between different lineages, providing a window into understanding bacterial speciation and taxonomic relationships. Keywords: comparative genomic hybridization

ORGANISM(S): Shigella flexneri 2a str. 301 Escherichia coli K-12 Shigella flexneri Escherichia coli Shigella boydii Shigella dysenteriae Sd197 Shigella dysenteriae Shigella boydii Sb227 Shigella sonnei Ss046

PROVIDER: GSE5212 | GEO | 2007/07/01

SECONDARY ACCESSION(S): PRJNA96505

REPOSITORIES: GEO