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Antonie van Leeuwenhoek

, Volume 90, Issue 4, pp 343–360 | Cite as

Bacterial endosymbioses in Solemya (Mollusca: Bivalvia)—Model systems for studies of symbiont–host adaptation

  • Frank J. Stewart
  • Colleen M. Cavanaugh
Original Paper

Abstract

Endosymbioses between chemosynthetic bacteria and marine invertebrates are remarkable biological adaptations to life in sulfide-rich environments. In these mutualistic associations, sulfur-oxidizing chemoautotrophic bacteria living directly within host cells both aid in the detoxification of toxic sulfide and fix carbon to support the metabolic needs of the host. Though best described for deep-sea vents and cold seeps, these symbioses are ubiquitous in shallow-water reducing environments. Indeed, considerable insight into sulfur-oxidizing endosymbioses in general comes from detailed studies of shallow-water protobranch clams in the genus Solemya. This review highlights the impressive body of work characterizing bacterial symbiosis in Solemya species, all of which are presumed to harbor endosymbionts. In particular, studies of the coastal Atlantic species Solemya  velum and its larger Pacific congener Solemya  reidi are the foundation for our understanding of the metabolism and physiology of marine bivalve symbioses, which are now known to occur in five families. Solemya  velum, in particular, is an excellent model organism for symbiosis research. This clam can be collected easily from coastal eelgrass beds and maintained in laboratory aquaria for extended periods. In addition, the genome of the S. velum symbiont is currently being sequenced. The integration of genomic data with additional experimental analyses will help reveal the molecular basis of the symbiont–host interaction in Solemya, thereby complementing the wide array of research programs aimed at better understanding the diverse relationships between bacterial and eukaryotic cells.

Keywords

Symbiosis Sulfur oxidation Gamma Proteobacteria Protobranch Intracellular Maternal transmission Y-shaped burrow 

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Notes

Acknowledgments

We thank our many colleagues for stimulating discussions over the years on solemyids and their symbionts, and especially J. Gijs Kuenen who was instrumental in the discovery of chemosynthetic bacteria in Solemya  velum and for his encouragement in the early stages of this research. Research in my laboratory on chemosynthetic symbioses has been supported by grants from NSF (Cell Biology, Ocean Science Division-Biological Oceanography, and RIDGE) and by a graduate fellowship from the NIH Genetics and Genomics Training Grant (FJS). We dedicate this paper to J. Gijs Kuenen on the embarkation (and continuation) of his hobby-de Microbiologie!

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© Springer Science+Business Media B.V. 2006

Authors and Affiliations

  1. 1.Department of Organismic and Evolutionary Biology, The Biological LaboratoriesHarvard UniversityCambridgeUSA

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