Genome sequence of Shigella flexneri 2a: insights into pathogenicity through comparison with genomes of Escherichia coli K12 and O157.

Abstract:

:We have sequenced the genome of Shigella flexneri serotype 2a, the most prevalent species and serotype that causes bacillary dysentery or shigellosis in man. The whole genome is composed of a 4 607 203 bp chromosome and a 221 618 bp virulence plasmid, designated pCP301. While the plasmid shows minor divergence from that sequenced in serotype 5a, striking characteristics of the chromosome have been revealed. The S.flexneri chromosome has, astonishingly, 314 IS elements, more than 7-fold over those possessed by its close relatives, the non-pathogenic K12 strain and enterohemorrhagic O157:H7 strain of Escherichia coli. There are 13 translocations and inversions compared with the E.coli sequences, all involve a segment larger than 5 kb, and most are associated with deletions or acquired DNA sequences, of which several are likely to be bacteriophage-transmitted pathogenicity islands. Furthermore, S.flexneri, resembling another human-restricted enteric pathogen, Salmonella typhi, also has hundreds of pseudogenes compared with the E.coli strains. All of these could be subjected to investigations towards novel preventative and treatment strategies against shigellosis.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Jin Q,Yuan Z,Xu J,Wang Y,Shen Y,Lu W,Wang J,Liu H,Yang J,Yang F,Zhang X,Zhang J,Yang G,Wu H,Qu D,Dong J,Sun L,Xue Y,Zhao A,Gao Y,Zhu J,Kan B,Ding K,Chen S,Cheng H,Yao Z,He B,Chen R,Ma D,Qiang B,

doi

10.1093/nar/gkf566

keywords:

subject

Has Abstract

pub_date

2002-10-15 00:00:00

pages

4432-41

issue

20

eissn

0305-1048

issn

1362-4962

journal_volume

30

pub_type

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