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Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations
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Published on: December 7, 2021

Multilocus genetics to reconstruct aeromonad evolution.

Frédéric Roger1, Hélène Marchandin, Estelle Jumas-Bilak

  • 1Laboratoire de Bactériologie-Virologie, Université Montpellier, France.

BMC Microbiology
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PubMed
Summary

Aeromonas bacteria show high genetic diversity, with some strains adapting to specific hosts and causing disease. This ongoing evolution suggests adaptation to specialized environments and niches.

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Genetics

Background:

  • Aeromonas species are diverse bacteria with varied lifestyles.
  • Understanding human aeromonosis requires investigating genetic diversity and evolutionary patterns in Aeromonas.
  • This study analyzed Aeromonas isolates from human, animal, and environmental sources.

Purpose of the Study:

  • To investigate genetic diversity, population structure, and evolution of Aeromonas species.
  • To identify specific characteristics of clinical Aeromonas isolates.
  • To improve the understanding of human aeromonosis.

Main Methods:

  • Genotyping of 195 Aeromonas isolates using multilocus sequence analysis (MLSA).
  • MLSA employed seven genes: dnaK, gltA, gyrB, radA, rpoB, tsf, and zipA.
  • Multilocus-based phylogenetic analysis (MLPA) was used to determine clades and population structure.

Main Results:

  • High genetic diversity was observed across the Aeromonas population.
  • MLPA identified 11 clades, including major ones for A. veronii, A. hydrophila, and A. caviae.
  • Clinical isolates showed lower genetic diversity than environmental ones, with some strains exhibiting host adaptation and disease specialization.

Conclusions:

  • Aeromonas evolution has led to significant genetic diversity and host-specific adaptations.
  • The A. caviae clade exhibits a distinct evolutionary rate.
  • The population structure suggests ongoing adaptation to specialized niches, with varying evolutionary advancement across clades.