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Title: The genome of the intracellular bacterium of the coastal bivalve, Solemya velum: a blueprint for thriving in and out of symbiosis

Journal Article · · BMC Genomics
 [1];  [1];  [1];  [2];  [3];  [4];  [5];  [5];  [6];  [7];  [8];  [8];  [8];  [1]
  1. Harvard Univ., Cambridge, MA (United States). Dept. of Organismic and Evolutionary Biology
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Civil and Environmental Engineering
  3. Polar Research Inst. of China, Shanghai (China). SOA Key Lab. for Polar Science
  4. TNO, Zeist (The Netherlands). Microbiology & Systems Biology Group
  5. Georgia Inst. of Technology, Atlanta, GA (United States). School of Biology
  6. Indiana Univ., Bloomington, IN (United States). Dept. of Biology
  7. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
  8. Univ. of California, Davis, CA (United States). Genome Center

Symbioses between chemoautotrophic bacteria and marine invertebrates are rare examples of living systems that are virtually independent of photosynthetic primary production. These associations have evolved multiple times in marine habitats, such as deep-sea hydrothermal vents and reducing sediments, characterized by steep gradients of oxygen and reduced chemicals. Due to difficulties associated with maintaining these symbioses in the laboratory and culturing the symbiotic bacteria, studies of chemosynthetic symbioses rely heavily on culture independent methods. The symbiosis between the coastal bivalve, Solemya velum, and its intracellular symbiont is a model for chemosynthetic symbioses given its accessibility in intertidal environments and the ability to maintain it under laboratory conditions. Here, to better understand this symbiosis, the genome of the S. velum endosymbiont was sequenced. Relative to the genomes of obligate symbiotic bacteria, which commonly undergo erosion and reduction, the S. velum symbiont genome was large (2.7 Mb), GC-rich (51%), and contained a large number (78) of mobile genetic elements. Comparative genomics identified sets of genes specific to the chemosynthetic lifestyle and necessary to sustain the symbiosis. In addition, a number of inferred metabolic pathways and cellular processes, including heterotrophy, branched electron transport, and motility, suggested that besides the ability to function as an endosymbiont, the bacterium may have the capacity to live outside the host. In conclusion, the physiological dexterity indicated by the genome substantially improves our understanding of the genetic and metabolic capabilities of the S. velum symbiont and the breadth of niches the partners may inhabit during their lifecycle.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1407257
Journal Information:
BMC Genomics, Vol. 15, Issue 1; ISSN 1471-2164
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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