Journal
SCIENCE
Volume 314, Issue 5797, Pages 312-313Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1130441
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Intracellular bacteria are characterized by genome reduction. The 422,434 - base pair genome of Buchnera aphidicola BCc, primary endosymbiont of the aphid Cinara cedri, is similar to 200 kilobases smaller than the previously sequenced B. aphidicola genomes. B. aphidicola BCc has lost most metabolic functions, including the ability to synthesize the essential amino acid tryptophan and riboflavin. In addition, most retained genes are evolving rapidly. Possibly, B. aphidicola BCc is losing its symbiotic capacity and is being complemented ( and might be replaced) by the highly abundant coexisting secondary symbiont.
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