A Hopeful Sea-Monster: A Very Large Homologous Recombination Event Impacting the Core Genome of the Marine Pathogen Vibrio anguillarum
Vibrio anguillarum is the causative agent of vibriosis in many species important to aquaculture. We generated whole genome sequence (WGS) data on a diverse collection of 64 V. anguillarum strains, which we supplemented with 41 publicly available genomes to produce a combined dataset of 105 strains....
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Published in | Frontiers in microbiology Vol. 11; p. 1430 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Frontiers Media S.A
29.06.2020
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Subjects | |
Online Access | Get full text |
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Summary: | Vibrio anguillarum
is the causative agent of vibriosis in many species important to aquaculture. We generated whole genome sequence (WGS) data on a diverse collection of 64
V. anguillarum
strains, which we supplemented with 41 publicly available genomes to produce a combined dataset of 105 strains. These WGS data resolved six major lineages (L1-L6), and the additional use of multilocus sequence analysis (MLSA) clarified the association of L1 with serotype O1 and
Salmonidae
hosts (salmon/trout), and L2 with serotypes O2a/O2b/O2c and
Gadidae
hosts (cod). Our analysis also revealed a large-scale homologous replacement of 526-kb of core genome in an L2 strain from a con-specific donor. Although the strains affected by this recombination event are exclusively associated with
Gadidae
, we find no clear genetic evidence that it has played a causal role in host specialism. Whilst it is established that
Vibrio
species freely recombine, to our knowledge this is the first report of a contiguous recombinational replacement of this magnitude in any
Vibrio
genome. We also note a smaller accessory region of high single nucleotide polymorphism (SNP) density and gene content variation that contains lipopolysaccharide biosynthesis genes which may play a role in determining serotype. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Reviewed by: Carolin Charlotte Wendling, ETH Zürich, Switzerland; Panos G. Kalatzis, University of Copenhagen, Denmark; Fabini Orata, University of Alberta, Canada Edited by: Rafal Mostowy, Jagiellonian University, Poland This article was submitted to Evolutionary and Genomic Microbiology, a section of the journal Frontiers in Microbiology |
ISSN: | 1664-302X 1664-302X |
DOI: | 10.3389/fmicb.2020.01430 |