Adhesion and invasion-related genes of Edwardsiella tarda ETSJ54

Noel Verjan Garcia, Carlos Iregui, Ikuo Hirono


Edwardsiella tarda es una bacteria Gram-negativa que causa una enfermedad supurativa sistémica en peces y humanos. Recientemente, el secuenciamiento del genoma de una cepa de E. tarda altamente virulenta y resistente a múltiples antibióticos aislada en China demostró que este microorganismo posee un número de genes asociados con virulencia y sistemas secretores de toxinas que explican, en cierto grado, su capacidad de sobrevivir dentro de células fagocíticas y de infectar a diversos hospederos. Sin embargo, esta cepa de E. tarda carece de motilidad y
tiene una estructura genética codificadora del flagelo y un sistema secretor tipo IV incompletos. En este estudio, a través de un secuenciamiento genómico parcial de librerías de ADN de E. tarda ETSJ54 construidas en vectores cósmido y plásmido, se identificaron un número de genes asociados a estructuras de superficie como invasinas, pili, sistema secretor tipo IV, fimbria y otros genes relacionados con virulencia. Es de notar que la secuencia de nucleótidos de la gran mayoría de dichos genes presentó identidad con genes previamente reportados en el genoma de E. tarda EIB202; sin embargo, algunos genes no tuvieron identidad alguna con aquellos reportados para este microorganismo. Los resultados indican que E. tarda ETSJ54 posee varios elementos genéticos asociados con adhesión, invasión y colonización de tejidos de peces y diferencias en el contenido genético entre cepas de origen geográfico distinto constituye un estímulo para el desarrollo de nuevos proyectos de secuenciamiento que permitan identificar los genes asociados a este sistema secretor que aún no han sido descritos en E. tarda.

Palabras clave

Adhesins, fimbria, pathogenesis, pili/T4SS genes, virulence.

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