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Type of Publication: | Journal article |
Publication status: | Published |
Author: | Boscaro, Vittorio; Kolisko, Martin; Felletti, Michele; Vannini, Claudia; Lynn, Denis H; Keeling, Patrick J |
Year of publication: | 2017 |
Published in: | Nature ecology & evolution ; 1 (2017), 8. - pp. 1160-1167. - eISSN 2397-334X |
Pubmed ID: | 29046583 |
DOI (citable link): | https://dx.doi.org/10.1038/s41559-017-0237-0 |
Summary: |
Endosymbiosis plays an important role in ecology and evolution, but fundamental aspects of the origin of intracellular symbionts remain unclear. The extreme age of many symbiotic relationships, lack of data on free-living ancestors and uniqueness of each event hinder investigations. Here, we describe multiple strains of the bacterium Polynucleobacter that evolved independently and under similar conditions from closely related, free-living ancestors to become obligate endosymbionts of closely related ciliate hosts. As these genomes reduced in parallel from similar starting states, they provide unique glimpses into the mechanisms underlying genome reduction in symbionts. We found that gene loss is contingently lineage-specific, with no evidence for ordered streamlining. However, some genes in otherwise disrupted pathways are retained, possibly reflecting cryptic genetic network complexity. We also measured substitution rates between many endosymbiotic and free-living pairs for hundreds of genes, which showed that genetic drift, and not mutation pressure, is the main non-selective factor driving molecular evolution in endosymbionts.
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Subject (DDC): | 570 Biosciences, Biology |
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BOSCARO, Vittorio, Martin KOLISKO, Michele FELLETTI, Claudia VANNINI, Denis H LYNN, Patrick J KEELING, 2017. Parallel genome reduction in symbionts descended from closely related free-living bacteria. In: Nature ecology & evolution. 1(8), pp. 1160-1167. eISSN 2397-334X. Available under: doi: 10.1038/s41559-017-0237-0
@article{Boscaro2017Paral-41344, title={Parallel genome reduction in symbionts descended from closely related free-living bacteria}, year={2017}, doi={10.1038/s41559-017-0237-0}, number={8}, volume={1}, journal={Nature ecology & evolution}, pages={1160--1167}, author={Boscaro, Vittorio and Kolisko, Martin and Felletti, Michele and Vannini, Claudia and Lynn, Denis H and Keeling, Patrick J} }
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