Multilocus Sequence Analysis of Putative Vibrio Mediterranei Strains and Description of Vibrio Thalassae Sp. Nov

Syst Appl Microbiol. 2014 Jul;37(5):320-8. doi: 10.1016/j.syapm.2014.05.005. Epub 2014 May 27.

Abstract

A multilocus sequence analysis based on partial gyrB, mreB, rpoD and pyrH genes was undertaken with 61 putative Vibrio mediterranei/V. shilonii strains from different hosts (mussels, oysters, clams, coral, fish and plankton) or habitat (seawater and sediment) and geographical origins (Mediterranean, Atlantic and Pacific). A consistent grouping was obtained with individual and concatenated gene sequences, and the clade, comprising 54 strains, was split into three subclades by all methods: subclade A (40 strains, including AK1, the former type strain of Vibrio shilonii), subclade B (8 strains) corresponding to the species V. mediterranei, and subclade C (six strains) representing a new species, V. thalassae sp. nov., with strain MD16(T) (=CECT 8203(T)=KCTC 32373(T)) as the proposed type strain. Average nucleotide identity (ANI) values, determined as a measure of genomic similarity, confirmed these assignments, and supported that strains in subclade C were a different species from V. mediterranei, with ANIb and ANIm figures lower than 90.0%. The synonymy of V. shilonii and V. mediterranei was also stressed by both MLSA and ANI determinations (97.0% between both type strains). No connection was found between geographic origin or sample type and MLSA grouping.

Keywords: ANI; MLSA; Partial genome sequences; Vibrio mediterranei; Vibrio shiloi; Vibrio shilonii; Vibrio thalassae.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Aquatic Organisms / microbiology*
  • Bacterial Proteins / genetics
  • Cluster Analysis
  • DNA, Bacterial / chemistry
  • DNA, Bacterial / genetics
  • DNA, Ribosomal / chemistry
  • DNA, Ribosomal / genetics
  • Molecular Sequence Data
  • Multilocus Sequence Typing*
  • Phylogeny
  • RNA, Ribosomal, 16S / genetics
  • Sequence Analysis, DNA
  • Vibrio / classification*
  • Vibrio / genetics
  • Vibrio / isolation & purification*

Substances

  • Bacterial Proteins
  • DNA, Bacterial
  • DNA, Ribosomal
  • RNA, Ribosomal, 16S

Associated data

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