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Journal Article

Horizontally transmitted symbiont populations in deep-sea mussels are genetically isolated

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Ansorge,  Rebecca
Department of Symbiosis, Max Planck Institute for Marine Microbiology, Max Planck Society;

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Dubilier,  Nicole
Department of Symbiosis, Max Planck Institute for Marine Microbiology, Max Planck Society;

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Citation

Picazo, D. R., Dagan, T., Ansorge, R., Petersen, J. M., Dubilier, N., & Kupczok, A. (2019). Horizontally transmitted symbiont populations in deep-sea mussels are genetically isolated. The ISME Journal, 13(12), 2954-2968. doi:10.1038/s41396-019-0475-z.


Cite as: https://hdl.handle.net/21.11116/0000-0005-BA6C-1
Abstract
Eukaryotes are habitats for bacterial organisms where the host
colonization and dispersal among individual hosts have consequences for
the bacterial ecology and evolution. Vertical symbiont transmission
leads to geographic isolation of the microbial population and
consequently to genetic isolation of microbiotas from individual hosts.
In contrast, the extent of geographic and genetic isolation of
horizontally transmitted microbiota is poorly characterized. Here we
show that chemosynthetic symbionts of individual Bathymodiolus brooksi
mussels constitute genetically isolated subpopulations. The
reconstruction of core genome-wide strains from high-resolution
metagenomes revealed distinct phylogenetic clades. Nucleotide diversity
and strain composition vary along the mussel life span and individual
hosts show a high degree of genetic isolation. Our results suggest that
the uptake of environmental bacteria is a restricted process in B.
brooksi, where self-infection of the gill tissue results in serial
founder effects during symbiont evolution. We conclude that bacterial
colonization dynamics over the host life cycle is thus an important
determinant of population structure and genome evolution of horizontally
transmitted symbionts.