Novel type 4 secretion system (T4SS)-related genes of Edwardsiella tarda

Edwardsiella tarda is a Gram-negative bacterium that causes edwardsiellosis, a disease of fish and mammals including humans and characterized by multiple abscesses. Different strains of E. tarda possess a number of virulence, antibioticresistance, and toxin secretion system-related genes that explai...

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Bibliographic Details
Main Authors: Verjan García, Noel, Iregui, Carlos, Hirano, Ikuo
Format: Article in Journal/Newspaper
Language:English
Published: 2015
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Online Access:https://dialnet.unirioja.es/servlet/oaiart?codigo=5634707
Description
Summary:Edwardsiella tarda is a Gram-negative bacterium that causes edwardsiellosis, a disease of fish and mammals including humans and characterized by multiple abscesses. Different strains of E. tarda possess a number of virulence, antibioticresistance, and toxin secretion system-related genes that explain in some extent its capacity to survive within phagocytic cells and to infect a variety of hosts. Previously we introduced a virulent E. tarda strain (ETSJ54) isolated from Japanese flounder (Paralichthys olivaceus) with edwardsiellosis and reported a number of virulence-related genes. In this study we have re-analyzed the sequencing data of ETSJ54 and identified novel type IV secretion system-related genes, most of them were flanked by transposase and plasmid encoding genes. Interestingly, their nucleotide sequence had no identity to those of the genes published in the E. tarda EIB202 genome, a virulent strain isolated from turbot (Scophthalmus maximus) in China. The results suggest differences in gene content between geographically distinct E. tarda strains that may encourage additional E. tarda genome sequencing projects. Edwardsiella tarda é uma bactéria Gram-negativas responsáveis pela edwardsiellosis, uma doença de peixes e mamíferos, incluindo os seres humanos, que é caracterizada pela formação de múltiplos abscessos. Diferentes cepas de E. Tarda possui um número de genes associados com a virulência e resistência a múltiplos antibióticos, sistemas secretores de toxinas, para explicar em certa medida a sua capacidade de sobreviver no interior das células fagocíticas e infectar diferentes hospedeiros. Em estudos anteriores o nosso grupo sequenciou parcialmente o genoma de uma estirpe virulenta de E. tarda (ETSJ54) isolado do linguado japonês Paralichthysolivaceus) com edwardsiellosis e relatou uma série de genes associados à virulência. Neste estudo foram analisados de novo os dados de seqüenciamento e, neste processo foram identificados vários genes que codificam para a estrutura de superfície Pili e sistema ...