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Identification of genes associated with the penetration activity of the human type of Edwardsiella tarda EdwGII through human colon epithelial cell monolayers.

Abstract：

:Edwardsiella tarda is a Gram-negative pathogen with a broad host range including fish and humans. E. tarda causes gastrointestinal and extraintestinal infections in humans. In present study, the penetration activities of 22 strains of E. tarda, including 10 human isolates and 12 diseased fish isolates, through Caco-2 cell monolayers were evaluated. All the human isolates exhibited penetration activity in contrast to the fish isolates, which did not. In order to identify genes responsible for penetration activity, we screened transposon (Tn) insertion mutants for reduced penetration activity. Two Tn insertion mutants showed markedly reduced penetration activity, and we identified the wecC and fliF genes as Tn insertion sites. The wecC and fliF genes encode UDP-N-acetyl-d-mannosamine dehydrogenase, which is involved in synthesis of enterobacterial common antigen and flagellar basal body M-ring protein, respectively. Motility activity, including swarming and swimming, by the wecC mutant was weaker than that by the wild-type strain, while the fliF mutant was immotile. These results indicated that the swarming and swimming abilities mediated by the wecC and fliF genes appeared to be essential for penetration activity of E. tarda through Caco-2 cell monolayers. We also demonstrated that it was possible to group E. tarda strains into two types of human isolates and diseased fish isolates based on distribution of the wecC gene, type III and type VI secretion system genes. PCR detection of the wecC gene may represent a useful method for detecting the human type of E. tarda, which may have the ability to cause human infection.

journal_name

Microb Pathog

journal_title

Microbial pathogenesis

authors

Suezawa C,Yasuda M,Negayama K,Kameyama T,Hirauchi M,Nakai T,Okuda J

doi

10.1016/j.micpath.2016.04.007

subject

Has Abstract

pub_date

2016-06-01 00:00:00

pages

148-156

eissn

0882-4010

issn

1096-1208

pii

S0882-4010(15)30007-3

journal_volume

95

pub_type

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