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Accelerated evolution in bacterial endosymbionts of aphids
C Buades1, J M Michelena, A Latorre
1Department of Genetics, University of Valencia, Spain.
Summary
Aphid endosymbiosis involves at least two distinct processes. One ancient symbiosis with Buchnera aphidicola, and newer ones with different bacteria, suggest ongoing evolutionary activity in aphids.
Area of Science:
- Microbial Ecology
- Evolutionary Biology
- Insect-Microbe Interactions
Background:
- Aphids harbor endosymbiotic bacteria essential for their nutrition.
- Previous studies suggested a single ancient endosymbiotic event in aphids.
Purpose of the Study:
- To investigate the possibility of multiple endosymbiotic processes in aphids.
- To analyze the evolutionary rates and genomic characteristics of aphid endosymbionts.
Main Methods:
- Comparative analysis of Adenine-Thymine (A+T) content in bacterial genomes.
- Examination of evolutionary rates for specific genes, such as the beta-subunit of the F-ATPase complex.
- Phylogenetic analysis of endosymbiotic bacteria.
Main Results:
- Evidence suggests at least two distinct endosymbiotic processes in aphids.
- The ancient endosymbiont Buchnera aphidicola was integrated over 150 million years ago.
- Newer endosymbiotic bacteria exhibit lower A+T content and slower evolutionary rates compared to B. aphidicola.
Conclusions:
- Endosymbiotic relationships are dynamic and actively shape aphid evolution.
- The presence of multiple endosymbiotic events indicates ongoing adaptation and diversification.
- Aphid endosymbiosis provides a model for studying the evolution of host-microbe interactions.