Apr 21, 2018

A Freeloader?: The Highly Eroded Yet Large Genome of the Serratia symbiotica symbiont of Cinara strobi

BioRxiv : the Preprint Server for Biology
Alejandro Manzano-MarínEmmanuelle Jousselin

Abstract

Genome reduction is pervasive among maternally-inherited bacterial endosymbionts. This genome reduction can eventually lead to serious deterioration of essential metabolic pathways, thus rendering an obligate endosymbiont unable to provide essential nutrients to its host. This loss of essential pathways can lead to either symbiont complementation (sharing of the nutrient production with a novel co-obligate symbiont) or symbiont replacement (complete takeover of nutrient production by the novel symbiont). However, the process by which these two evolutionary events happen remains somewhat enigmatic by the lack of examples of intermediate stages of this process. Cinara aphids (Hemiptera: Aphididae) typically harbour two obligate bacterial symbionts: Buchnera and Serratia symbiotica . However, the latter has been replaced by different bacterial taxa in specific lineages, and thus species within this aphid lineage could provide important clues into the process of symbiont replacement. In the present study, using 16S rRNA high-throughput amplicon sequencing, we determined that the aphid Cinara strobi harbours not two, but three fixed bacterial symbionts: Buchnera aphidicola , a Sodalis sp., and S. symbiotica . Through genome assembly...Continue Reading

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Mentioned in this Paper

Metabolic Process, Cellular
Study
Biochemical Pathway
Coccomyces strobi
Aphis chenopodii glauci preparation
Buchnera aphidicola
Genome
Cinara
Cinara strobi
Serratia symbiotica

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