Cospeciation of Chemoautotrophic Bacteria and Deep Sea Clams

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 patte...

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Published inProceedings of the National Academy of Sciences - PNAS Vol. 95; no. 17; pp. 9962 - 9966
Main Authors Peek, Andrew S., Feldman, Robert A., Lutz, Richard A., Vrijenhoek, Robert C.
Format Journal Article
LanguageEnglish
Published United States National Academy of Sciences of the United States of America 18.08.1998
National Acad Sciences
National Academy of Sciences
The National Academy of Sciences
Subjects
Animals
Bacteria
Bacteria - classification
Bacteria - genetics
Biological Sciences
Bivalvia - classification
Bivalvia - genetics
Bivalvia - microbiology
Clams
DNA, Bacterial - genetics
DNA, Ribosomal - genetics
Evolution
Female
Likelihood Functions
Marine
Models, Genetic
Mollusca
Mollusks
Ovum - microbiology
Phylogenetics
Phylogeny
Ribosomal DNA
Species Specificity
Symbionts
Symbiosis
Taxa
Topology
Vesicomyidae
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Summary: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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Present address: Department of Ecology and Evolutionary Biology, 321 Steinhaus Hall, University of California at Irvine, Irvine, CA 92697-2525.
Present address: Diversa Corporation, 10665 Sorrento Valley Road, San Diego, CA 92121.
To whom reprint requests should be addressed at: Center for Theoretical and Applied Genetics, 71 Dudley Road, Rutgers University, New Brunswick, NJ 08901-8521. e-mail: peek@darwin.bio.uci.edu.
Communicated by Margaret G. Kidwell, University of Arizona, Tucson, AZ
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.95.17.9962