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Genomic Signals of Adaptation towards Mutualism and Sociality in Two Ambrosia Beetle Complexes

Red de Estudios Moleculares Avanzados, Instituto de Ecología A.C, Xalapa, Veracruz 91070, Mexico
Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Ciudad de México 04500, Mexico
Cátedras CONACyT/Centro de Investigación en Alimentación y Desarrollo, Hermosillo 83304, Mexico
Tropical Research and Education Center, University of Florida, Homestead, FL 33031, USA
Department of Plant Pathology, University of California–Riverside, Riverside, CA 92521, USA
Department of Plant Pathology, University of California, Davis, CA 95616-8751, USA
Cátedras CONACyT/Instituto de Ecología A.C., Xalapa, Veracruz 91070, Mexico
Author to whom correspondence should be addressed.
Received: 14 October 2018 / Revised: 8 December 2018 / Accepted: 20 December 2018 / Published: 22 December 2018
(This article belongs to the Special Issue Evolution of Mutualistic Symbiosis)
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Mutualistic symbiosis and eusociality have developed through gradual evolutionary processes at different times in specific lineages. Like some species of termites and ants, ambrosia beetles have independently evolved a mutualistic nutritional symbiosis with fungi, which has been associated with the evolution of complex social behaviors in some members of this group. We sequenced the transcriptomes of two ambrosia complexes (Euwallacea sp. near fornicatusFusarium euwallaceae and Xyleborus glabratus–Raffaelea lauricola) to find evolutionary signatures associated with mutualism and behavior evolution. We identified signatures of positive selection in genes related to nutrient homeostasis; regulation of gene expression; development and function of the nervous system, which may be involved in diet specialization; behavioral changes; and social evolution in this lineage. Finally, we found convergent changes in evolutionary rates of proteins across lineages with phylogenetically independent origins of sociality and mutualism, suggesting a constrained evolution of conserved genes in social species, and an evolutionary rate acceleration related to changes in selective pressures in mutualistic lineages. View Full-Text
Keywords: mutualism; sociality evolution; ambrosia beetle complexes; polyphagous shot hole borer; redbay ambrosia beetle mutualism; sociality evolution; ambrosia beetle complexes; polyphagous shot hole borer; redbay ambrosia beetle

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Blaz, J.; Barrera-Redondo, J.; Vázquez-Rosas-Landa, M.; Canedo-Téxon, A.; Aguirre von Wobeser, E.; Carrillo, D.; Stouthamer, R.; Eskalen, A.; Villafán, E.; Alonso-Sánchez, A.; Lamelas, A.; Ibarra-Juarez, L.A.; Pérez-Torres, C.A.; Ibarra-Laclette, E. Genomic Signals of Adaptation towards Mutualism and Sociality in Two Ambrosia Beetle Complexes. Life 2019, 9, 2.

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