Abstract
The discovery of bacterium-bivalve symbioses capable of utilizing methane as a carbon and energy source indicates that the endosymbionts of hydrothermal vent and cold seep bivalves are not restricted to sulfur-oxidizing chemoautotrophic bacteria but also include methanotrophic bacteria. The phylogenetic origin of methanotrophic endosymbionts and their relationship to known symbiotic and free-living bacteria, however, have remained unexplored. In situ localization and phylogenetic analysis of a symbiont 16S rRNA gene cloned from the gills of a recently described deep-sea mussel species demonstrate that this symbiont represents a new taxon which is closely related to free-living, cultivable Type I methanotrophic bacteria. This symbiont is distinct from known chemoautotrophic symbionts. Thus, despite compelling similarities between the symbioses, chemoautotrophic and methanotrophic symbionts of marine bivalves have independent phylogenetic origins.
MeSH Terms
Animals
Bacteria/classification,genetics
Base Sequence
Biological Evolution
Bivalvia/microbiology,ultrastructure
DNA, Ribosomal/genetics
Gills/microbiology,ultrastructure
In Situ Hybridization
Methylococcaceae/classification,genetics,isolation & purification,ultrastructure
Molecular Sequence Data
Phylogeny
RNA, Ribosomal, 16S/genetics
Symbiosis
Chemicals
DNA, Ribosomal
RNA, Ribosomal, 16S
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Distel D L
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138.
Cavanaugh C M
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