RRC ID 53200
Author Theethakaew C, Nakamura S, Motooka D, Matsuda S, Kodama T, Chonsin K, Suthienkul O, Iida T.
Title Plasmid dynamics in Vibrio parahaemolyticus strains related to shrimp Acute Hepatopancreatic Necrosis Syndrome (AHPNS).
Journal Infect. Genet. Evol.
Abstract Vibrio parahaemolyticus is a causative agent of acute hapatopancreatic necrosis syndrome (AHPNS) which causes early mortality in white shrimp. Emergence of AHPNS has caused tremendous economic loss for aquaculture industry particularly in Asia since 2010. Previous studies reported that strains causing AHPNS harbor a 69-kb plasmid with possession of virulence genes, pirA and pirB. However, genetic variation of the 69-kb plasmid among AHPNS related strains has not been investigated. This study aimed to analyze genetic composition and diversity of the 69-kb plasmid in strains isolated from shrimps affected by AHPNS. Plasmids recovered from V. parahaemolyticus strain VPE61 which represented typical AHPNS pathogenicity, strain VP2HP which did not represent AHPNS pathogenicity but was isolated from AHPNS affected shrimp and other AHPNS V. parahaemolyticus isolates in Genbank were investigated. Protein coding genes of the 69-kb plasmid from the strain VPE61 were identical to that of AHPNS strain from Vietnam except the inverted complement 3.4-kb transposon covering pirA and pirB. The strain VP2HP possessed remarkable large 183-kb plasmid which shared similar protein coding genes to those of the 69-kb plasmid from strain VPE61. However, the 3.4-kb transposon covering pirA and pirB was absent from the 183-kb plasmid in strain VP2HP. A number of protein coding genes from the 183-kb plasmid were also detected in other AHPNS strains. In summary, this study identified a novel 183-kb plasmid that is related to AHPNS causing strains. Homologous recombination of the 69-kb AHPNS plasmid and other naturally occurring plasmids together with loss and gain of AHPNS virulence genes in V. parahaemolyticus were observed. The outcome of this research enables understanding of plasmid dynamics that possibly affect variable degrees of AHPNS pathogenicity.
Volume 51
Pages 211-218
Published 2017-7
DOI 10.1016/j.meegid.2017.04.007
PII S1567-1348(17)30120-X
PMID 28404482
MeSH Animals Aquaculture / economics Bacterial Proteins / genetics* Bacterial Proteins / metabolism DNA Transposable Elements Genetic Variation Hepatopancreas / pathology Hepatopancreas / virology* Penaeidae / microbiology* Phylogeny Plasmids / chemistry* Plasmids / metabolism Vibrio parahaemolyticus / classification Vibrio parahaemolyticus / genetics* Vibrio parahaemolyticus / pathogenicity* Vietnam Virulence
IF 2.545
Resource
Pathogenic bacteria 病原細菌