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Understanding the evolutionary relationships among microorganisms is fundamental to microbial ecology and taxonomy. Phylogenetic trees are essential tools for inferring these relationships, relying primarily on comparative analyses of molecular sequences such as DNA, RNA, or proteins. In microbial studies, these trees typically depict the evolutionary paths of diverse bacterial and archaeal species by mapping genetic differences accumulated over time.Phylogenetic trees are composed of tips,...
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Multi-locus Variable-number Tandem-repeat Analysis of the Fish-pathogenic Bacterium Yersinia ruckeri by Multiplex PCR and Capillary Electrophoresis
10:33

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Published on: June 17, 2019

Multilocus sequence phylogenetic analysis of Avibacterium.

M Bisgaard1, N Nørskov-Lauritsen2, S J de Wit3

  • 1Department of Veterinary Disease Biology, Faculty of Life Sciences, University of Copenhagen, 4 Stigbøjlen, DK-1870 Frederiksberg C, Denmark.

Microbiology (Reading, England)
|January 14, 2012
PubMed
Summary
This summary is machine-generated.

The genus Avibacterium likely contains only two or three species, with identification challenging even using DNA sequencing. Further taxonomic revision is recommended for unresolved Avibacterium isolates.

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Area of Science:

  • Bacteriology
  • Microbial Taxonomy
  • Genetics

Background:

  • The genus Avibacterium comprises several species, some of which are difficult to differentiate.
  • Accurate species identification is crucial for understanding bacterial ecology and disease transmission.

Purpose of the Study:

  • To investigate the phylogenetic relationships and species boundaries within the genus Avibacterium.
  • To assess the reliability of DNA sequencing for differentiating Avibacterium species.

Main Methods:

  • Phylogenetic analysis of partially sequenced housekeeping genes (recN, rpoB, infB, pgi, sodA).
  • Examination of 49 field isolates and six type/reference strains of Avibacterium.

Main Results:

  • Confirmed the existence of Avibacterium paragallinarum.
  • A species complex including Avibacterium volantium, Avibacterium avium, Avibacterium gallinarum, Avibacterium endocarditis, and Avibacterium sp. A could not be resolved.
  • Identified low genetic diversity or evidence of horizontal gene transfer (HGT) among isolates, complicating species identification.

Conclusions:

  • Species identification within the genus Avibacterium is problematic, even with DNA sequencing, except for Avibacterium paragallinarum.
  • The genus Avibacterium likely contains only two or three species.
  • Recommends designating unresolved isolates as Avibacterium sp. pending taxonomic revision.