Edwardsiella piscicida identified in the southeastern USA by gyrB sequence, species-specific and repetitive sequence-mediated PCR

Matt J. Griffin, Cynthia Ware, Sylvie M. Quiniou, James M. Steadman, Patricia S. Gaunt, Lester H. Khoo, Esteban Soto Martinez

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

A new Edwardsiella taxon was recently described from fishes of Europe and Asia. Phenotypically similar to E. tarda, extensive genetic and phenotypic characterization determined this new strain does not belong to any established Edwardsiella taxa, leading to the adoption of a new taxon, E. piscicida. Concurrent research in the USA also identified 2 genetically distinct taxa within the group of organisms traditionally classified as E. tarda. Comparisons of gyrB sequences between US isolates and E. piscicida from Europe and Asia identified several US isolates with >99.6% similarity to the gyrB sequence of the E. piscicida type strain (ET883) but <87% similarity to the E. tarda type strain (ATCC #15947). A discriminatory PCR was developed for the identification of E. tarda and 2 genetic variants of E. piscicida (E. piscicida and E. piscicida-like species). Using these PCR assays, a survey was conducted of 44 archived bacterial specimens from disease case submissions to the Aquatic Research and Diagnostic Laboratory (Stoneville, MS, USA) between 2007 and 2012. All 44 isolates, originally identified phenotypically and biochemically as E. tarda, were identified as E. piscicida by PCR. Repetitive sequence-mediated PCR (rep-PCR) analysis of these archived specimens suggests they are largely homogenous, similar to what has been observed for E. ictaluri. The gyrB sequence data, coupled with the E. piscicida specific-PCR and rep-PCR data, confirms that E. piscicida has been isolated from fish disease cases in the southeastern USA. Moreover, our survey data suggests E. piscicida may be more prevalent in catfish aquaculture than E. tarda.

Original languageEnglish (US)
Pages (from-to)23-35
Number of pages13
JournalDiseases of Aquatic Organisms
Volume108
Issue number1
DOIs
StatePublished - Feb 4 2014
Externally publishedYes

Fingerprint

repetitive sequences
new taxon
Edwardsiella
aquaculture
assay
fish
Edwardsiella piscicida
Edwardsiella tarda
fish diseases
new taxa
Europe
Asia
catfish

Keywords

  • E. piscicida
  • Edwardsiella tarda
  • GyrB
  • PCR
  • Rep-PCR
  • Repetitive sequence-mediated PCR

ASJC Scopus subject areas

  • Aquatic Science
  • Ecology, Evolution, Behavior and Systematics

Cite this

Edwardsiella piscicida identified in the southeastern USA by gyrB sequence, species-specific and repetitive sequence-mediated PCR. / Griffin, Matt J.; Ware, Cynthia; Quiniou, Sylvie M.; Steadman, James M.; Gaunt, Patricia S.; Khoo, Lester H.; Soto Martinez, Esteban.

In: Diseases of Aquatic Organisms, Vol. 108, No. 1, 04.02.2014, p. 23-35.

Research output: Contribution to journalArticle

Griffin, Matt J. ; Ware, Cynthia ; Quiniou, Sylvie M. ; Steadman, James M. ; Gaunt, Patricia S. ; Khoo, Lester H. ; Soto Martinez, Esteban. / Edwardsiella piscicida identified in the southeastern USA by gyrB sequence, species-specific and repetitive sequence-mediated PCR. In: Diseases of Aquatic Organisms. 2014 ; Vol. 108, No. 1. pp. 23-35.
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