4.6 Article

Phylogenetic Revision of the Genus Aliivibrio: Intra- and Inter-Species Variance Among Clusters Suggest a Wider Diversity of Species

Journal

FRONTIERS IN MICROBIOLOGY
Volume 12, Issue -, Pages -

Publisher

FRONTIERS MEDIA SA
DOI: 10.3389/fmicb.2021.626759

Keywords

Vibrionaceae; Aliivibrio; phylogeny; multilocus sequence analysis; marine bacteria; species group coherence; marker gene

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Funding

  1. UiT The Arctic University of Norway
  2. Research Council of Norway (RCN) by the Nofima basic grant [194050/F40]

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Genus Aliivibrio, known for bioluminescence and pathogenic behavior affecting fish farming, has been reclassified and poorly understood phylogenetically since 2007. Through MLSA with 143 bacterial strains, this study identified 12 clades and proposed a new species, Aliivibrio sp. friggae. Marker gene analysis revealed gyrB, pyrH, and recA as superior to 16S rRNA for accurate species classification in Aliivibrio.
Genus Aliivibrio is known to harbor species exhibiting bioluminescence as well as pathogenic behavior affecting the fish farming industry. Current phylogenetic understanding of Aliivibrio has largely remained dormant after reclassification disentangled it from the Vibrio genus in 2007. There is growing evidence of wider diversity, but until now the lack of genomes and selective use of type strains have limited the ability to compare and classify strains firmly. In this study, a total of 143 bacterial strains, including 51 novel sequenced strains, were used to strengthen phylogenetic relationships in Aliivibrio by exploring intra-species and inter-species relations. Multilocus sequence analysis (MLSA), applying the six housekeeping genes 16S ribosomal RNA (rRNA), gapA, gyrB, pyrH, recA, and rpoA, inferred 12 clades and a singular branch in Aliivibrio. Along with four new phylogenetic clades, the MLSA resolved prior inconsistencies circumscribing Aliivibrio wodanis and formed a unique clade we propose as the novel species Aliivibrio sp. friggae. Furthermore, phylogenetic assessment of individual marker genes showed gyrB, pyrH, and recA superior to the 16S rRNA gene, resolving accurately for most species clades in Aliivibrio. In this study, we provide a robust phylogenetic groundwork for Aliivibrio as a reference point to classification of species.

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