Ecological specificity of the metagenome in a set of lower termite species supports contribution of the microbiome to adaptation of the host

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2019
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Waidele, Lena
Korb, Judith
Dedeine, Franck
Staubach, Fabian
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Background:
Elucidating the interplay between hosts and their microbiomes in ecological adaptation has become a central theme in evolutionary biology. A textbook example of microbiome-mediated adaptation is the adaptation of lower termites to a wood-based diet, as they depend on their gut microbiome to digest wood. Lower termites have further adapted to different life types. Termites of the wood-dwelling life type never leave their nests and feed on a uniform diet. Termites of the foraging life type forage for food outside the nest and have access to other nutrients. Here we sought to investigate whether the microbiome that is involved in food substrate breakdown and nutrient acquisition might contribute to adaptation to these dietary differences. We reasoned that this should leave ecological imprints on the microbiome.

Results:
We investigated the protist and bacterial microbiomes of a total of 29 replicate colonies from five termite species, covering both life types, using metagenomic shotgun sequencing. The microbiome of wood-dwelling species with a uniform wood diet was enriched for genes involved in lignocellulose degradation. Furthermore, metagenomic patterns suggest that the microbiome of wood-dwelling species relied primarily on direct fixation of atmospheric nitrogen, while the microbiome of foraging species entailed the necessary pathways to utilize nitrogen in the form of nitrate for example from soil.

Conclusion:
Our findings are consistent with the notion that the microbiome of wood-dwelling species bears an imprint of its specialization on degrading a uniform wood diet, while the microbiome of the foraging species might reflect its adaption to access growth limiting nutrients from more diverse sources. This supports the idea that specific subsets of functions encoded by the microbiome can contribute to host adaptation.

Zusammenfassung in einer weiteren Sprache
Fachgebiet (DDC)
570 Biowissenschaften, Biologie
Schlagwörter
Lower termites, Metagenomics, Ecology, Adaptation
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ISO 690WAIDELE, Lena, Judith KORB, Christian R. VOOLSTRA, Franck DEDEINE, Fabian STAUBACH, 2019. Ecological specificity of the metagenome in a set of lower termite species supports contribution of the microbiome to adaptation of the host. In: Animal Microbiome. BioMed Central. 2019(1), 13. eISSN 2524-4671. Available under: doi: 10.1186/s42523-019-0014-2
BibTex
@article{Waidele2019-12Ecolo-50709,
  year={2019},
  doi={10.1186/s42523-019-0014-2},
  title={Ecological specificity of the metagenome in a set of lower termite species supports contribution of the microbiome to adaptation of the host},
  number={1},
  journal={Animal Microbiome},
  author={Waidele, Lena and Korb, Judith and Voolstra, Christian R. and Dedeine, Franck and Staubach, Fabian},
  note={Article Number: 13}
}
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    <dcterms:abstract xml:lang="eng">Background:&lt;br /&gt;Elucidating the interplay between hosts and their microbiomes in ecological adaptation has become a central theme in evolutionary biology. A textbook example of microbiome-mediated adaptation is the adaptation of lower termites to a wood-based diet, as they depend on their gut microbiome to digest wood. Lower termites have further adapted to different life types. Termites of the wood-dwelling life type never leave their nests and feed on a uniform diet. Termites of the foraging life type forage for food outside the nest and have access to other nutrients. Here we sought to investigate whether the microbiome that is involved in food substrate breakdown and nutrient acquisition might contribute to adaptation to these dietary differences. We reasoned that this should leave ecological imprints on the microbiome.&lt;br /&gt;&lt;br /&gt;Results:&lt;br /&gt;We investigated the protist and bacterial microbiomes of a total of 29 replicate colonies from five termite species, covering both life types, using metagenomic shotgun sequencing. The microbiome of wood-dwelling species with a uniform wood diet was enriched for genes involved in lignocellulose degradation. Furthermore, metagenomic patterns suggest that the microbiome of wood-dwelling species relied primarily on direct fixation of atmospheric nitrogen, while the microbiome of foraging species entailed the necessary pathways to utilize nitrogen in the form of nitrate for example from soil.&lt;br /&gt;&lt;br /&gt;Conclusion:&lt;br /&gt;Our findings are consistent with the notion that the microbiome of wood-dwelling species bears an imprint of its specialization on degrading a uniform wood diet, while the microbiome of the foraging species might reflect its adaption to access growth limiting nutrients from more diverse sources. This supports the idea that specific subsets of functions encoded by the microbiome can contribute to host adaptation.</dcterms:abstract>
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