Adaptive variation of buchnera endosymbiont density in aphid host acyrthosiphon pisum controlled by environmental conditions - Institut Pasteur de Lille Accéder directement au contenu
Article Dans Une Revue ACS Omega Année : 2021

Adaptive variation of buchnera endosymbiont density in aphid host acyrthosiphon pisum controlled by environmental conditions

Résumé

The scarcity of transcriptional regulatory genes in Buchnera aphidicola, an obligate endosymbiont in aphids, suggests the stability of expressed gene patterns and metabolic pathways. This observation argues in favor of the hypothesis that this endosymbiont bacteria might contribute little to the host adaptation when aphid hosts are facing challenging fluctuating environment. Finding evidence for the increased expression or silenced genes involved in metabolic pathways under the pressure of stress conditions and/or a given environment has been challenging for experimenters with this bacterial symbiotic model. Transcriptomic data have shown that Buchnera gene expression changes are confined to a narrow range when the aphids face brutal environmental variations. In this report, we demonstrate that instead of manipulating individual genes, the conditions may act on the relative mass of endosymbiont corresponding to the needs of the host. The control of the fluctuating number of endosymbiont cells per individual host appears to be an unexpected regulatory modality that contributes to the adaptation of aphids to their environment. This feature may account for the success of the symbiotic advantages in overcoming the drastic changes in temperature and food supplies during evolution.
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hal-03296049 , version 1 (22-07-2021)

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F. Neiers, Jean-Michel Saliou, Loïc Briand, Alain Robichon. Adaptive variation of buchnera endosymbiont density in aphid host acyrthosiphon pisum controlled by environmental conditions. ACS Omega, 2021, 6 (28), pp.17902-17914. ⟨10.1021/acsomega.1c01465⟩. ⟨hal-03296049⟩
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