Different Endosymbiotic Interactions in Two Hydra Species Reflect the Evolutionary History of Endosymbiosis
KAUST DepartmentComputational Bioscience Research Center (CBRC)
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AbstractEndosymbiosis is an important evolutionary event for organisms, and there is widespread interest in understanding the evolution of endosymbiosis establishment. Hydra is one of the most suitable organisms for studying the evolution of endosymbiosis. Within the genus Hydra, H. viridissima and H. vulgaris show endosymbiosis with green algae. Previous studies suggested that the endosymbiosis in H. vulgaris took place much more recently than that in H. viridissima, noting that the establishment of the interaction between H. vulgaris and its algae is not as stable as in H. viridissima. To investigate the on-going process of endosymbiosis, we first compared growth and tolerance to starvation in symbiotic and aposymbiotic polyps of both species. The results revealed that symbiotic H. viridissima had a higher growth rate and greater tolerance to starvation than aposymbiotic polyps. By contrast, growth of symbiotic H. vulgaris was identical to that of aposymbiotic polyps, and symbiotic H. vulgaris was less tolerant to starvation. Moreover, our gene expression analysis showed a pattern of differential gene expression in H. viridissima similar to that in other endosymbiotically established organisms, and contrary to that observed in H. vulgaris. We also showed that H. viridissima could cope with oxidative stress that caused damage, such as cell death, in H. vulgaris. These observations support the idea that oxidative stress related genes play an important role in the on-going process of endosymbiosis evolution. The different evolutionary stages of endosymbiosis studied here provide a deeper insight into the evolutionary processes occurring toward a stable endosymbiosis.
CitationDifferent Endosymbiotic Interactions in Two Hydra Species Reflect the Evolutionary History of Endosymbiosis 2016, 8 (7):2155 Genome Biology and Evolution
SponsorsThe authors thank Ikuko Masujima, Takako Komatsu, and Tae Yamada for helping with Hydra spp. maintenance, and the collaborators of the Beijing Institute for Genomics (BGI) and the Bioscience Core Lab in King Abdullah University of Science and Technology (KAUST) for carrying out sequencing. The authors would also like to thank the ROIS National Institute of Genetics for the use of their NIG supercomputer. This work was supported by the Graduate University for Advanced Studies (SOKENDAI) to M.I. and by KAUST baseline fund to T.G.
PublisherOxford University Press (OUP)
JournalGenome Biology and Evolution
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