| comparative analysis of two genomic regions among four strains of buchnera aphidicola, primary endosymbiont of aphids. | preliminary analysis of two selected genomic regions of buchnera aphidicola bcc, the primary endosymbiont of the cedar aphid cinara cedri, has revealed a number of interesting features when compared with the corresponding homologous regions of the three b. aphidicola genomes previously sequenced, that are associated with different aphid species. both regions exhibit a significant reduction in length and gene number in b. aphidicola bcc, as it could be expected since it possess the smallest bacte ... | 2004 | 15716086 |
| a small microbial genome: the end of a long symbiotic relationship? | 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 approximately 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 sym ... | 2006 | 17038625 |
| evolution of the secondary symbiont "candidatus serratia symbiotica" in aphid species of the subfamily lachninae. | buchnera aphidicola bcc, the primary endosymbiont of the aphid cinara cedri (subfamily lachninae), is losing its symbiotic capacity and might be replaced by the coresident "candidatus serratia symbiotica." phylogenetic and morphological analyses within the subfamily lachninae indicate two different "ca. serratia symbiotica" lineages and support the longtime coevolution of both symbionts in c. cedri. | 2008 | 18502932 |
| the striking case of tryptophan provision in the cedar aphid cinara cedri. | buchnera aphidicola bcc has lost its symbiotic role as the tryptophan supplier to the aphid cinara cedri. we report the presence of a plasmid in this endosymbiont that contains the trpeg genes. the remaining genes for the pathway (trpdcba) are located on the chromosome of the secondary endosymbiont "candidatus serratia symbiotica." thus, we propose that a symbiotic consortium is necessary to provide tryptophan. | 2008 | 18586942 |
| Serratia symbiotica from the aphid Cinara cedri: a missing link from facultative to obligate insect endosymbiont. | The genome sequencing of Buchnera aphidicola BCc from the aphid Cinara cedri, which is the smallest known Buchnera genome, revealed that this bacterium had lost its symbiotic role, as it was not able to synthesize tryptophan and riboflavin. Moreover, the biosynthesis of tryptophan is shared with the endosymbiont Serratia symbiotica SCc, which coexists with B. aphidicola in this aphid. The whole-genome sequencing of S. symbiotica SCc reveals an endosymbiont in a stage of genome reduction that is ... | 2011 | 22102823 |