Open AccessCospeciation of chemoautotrophic bacteria and deep sea clams
Author(s) -
Andrew S. Peek,
Robert A. Feldman,
Richard A. Lutz,
Robert C. Vrijenhoek
Publication year - 1998
Publication title -
proceedings of the national academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.95.17.9962
Subject(s) - biology , phylogenetic tree , phylogenetics , cytochrome c oxidase subunit i , evolutionary biology , bacteria , horizontal gene transfer , 16s ribosomal rna , symbiosis , zoology , cytochrome c oxidase , genetics , gene , ecology , mitochondrion
Vesicomyid clams depend entirely on sulfur-oxidizing endosymbiotic bacteria for their nutriment. Endosymbionts that are transmitted cytoplasmically through eggs, such as these, should exhibit a phylogenetic pattern that closely parallels the phylogeny of host mitochondrial genes. Such parallel patterns are rarely observed, however, because they are obscured easily by small amounts of horizontal symbiont transmission or occasional host switching. The present symbiont genealogy, based on bacterial small subunit (16S) rDNA sequences, was closely congruent with the host genealogy, based on clam mitochondrial cytochrome oxidase subunit I and large subunit (16S) rDNA sequences. This phylogenetic evidence supports the hypothesis of cospeciation and a long term association between the participants in this symbiosis.
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