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Polzin, J.* ; Arevalo, P.* ; Nussbaumer, T. ; Polz, M.F.* ; Bright, M.*

Polyclonal symbiont populations in hydrothermal vent tubeworms and the environment.

Proc. Biol. Sci. 286:20181281 (2019)
Verlagsversion Forschungsdaten DOI
Open Access Gold (Paid Option)
Creative Commons Lizenzvertrag
Horizontally transmitted symbioses usually house multiple and variable symbiont genotypes that are acquired from a much more diverse environmental pool via partner choice mechanisms. However, in the deep-sea hydrothermal vent tubeworm Riftia pachyptila (Vestimentifera, Siboglinidae), it has been suggested that the Candidatus Endoriftia persephone symbiont is monoclonal. Here, we show with high-coverage metagenomics that adult R. pachyptila house a polyclonal symbiont population consisting of one dominant and several low-frequency variants. This dominance of one genotype is confirmed by multilocus gene sequencing of amplified housekeeping genes in a broad range of host individuals where three out of four loci (atpA, uvrD and recA) revealed no genomic differences, while one locus (gyrB) was more diverse in adults than in juveniles. We also analysed a metagenome of free-living Endoriftia and found that the free-living population showed greater sequence variability than the host-associated population. Most juveniles and adults shared a specific dominant genotype, while other genotypes can dominate in few individuals. We suggest that although generally permissive, partner choice is selective enough to restrict uptake of some genotypes present in the environment.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Tubeworm Symbiosis ; Mutualism ; Population Genetics ; Metagenomics ; Partner Choice ; Symbiont Distribution; Riftia-pachyptila; Evolution; Endosymbionts; Transmission; Cooperation; Diversity; Sanctions; Sulfide; Light
ISSN (print) / ISBN 0962-8452
e-ISSN 1471-2954
Quellenangaben Band: 286, Heft: 1896, Seiten: , Artikelnummer: 20181281 Supplement: ,
Verlag Royal Society of London
Verlagsort 6-9 Carlton House Terrace, London Sw1y 5ag, England
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Environmental Medicine (IEM)