Some animals have the remarkable capacity to acclimate across generations to projected future climate change1,2,3,4; however, the underlying molecular processes are unknown. We sequenced and assembled de novo transcriptomes of adult tropical reef fish exposed developmentally or transgenerationally to projected future ocean temperatures and correlated the resulting expression profiles with acclimated metabolic traits from the same fish. We identified 69 contigs representing 53 key genes involved in thermal acclimation of aerobic capacity. Metabolic genes were among the most upregulated transgenerationally, suggesting shifts in energy production for maintaining performance at elevated temperatures. Furthermore, immune- and stress-responsive genes were upregulated transgenerationally, indicating a new complement of genes allowing the second generation of fish to better cope with elevated temperatures. Other differentially expressed genes were involved with tissue development and transcriptional regulation. Overall, we found a similar suite of differentially expressed genes among developmental and transgenerational treatments. Heat-shock protein genes were surprisingly unresponsive, indicating that short-term heat-stress responses may not be a good indicator of long-term acclimation capacity. Our results are the first to reveal the molecular processes that may enable marine fishes to adjust to a future warmer environment over multiple generations.
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This study was supported by the Australian Research Council (ARC) and the ARC Centre of Excellence for Coral Reef Studies (P.L.M. and W.L.), the Competitive Research Funds OCRF-2014-CRG3-62140408 from the King Abdullah University of Science and Technology (T.Ravasi, M.L.B., T.Ryu, L.S., and Y.G.), the Australian Coral Reef Society (H.D.V.), and a GBRMPA Science for Management Award (H.D.V.). This project was completed under JCU Ethics A1233 and A1415. We thank J. L. Rummer for comments on the manuscript and members of the Molecular Ecology and Evolution Laboratory (JCU), Marine and Aquaculture Research Facilities Unit (JCU), Integrative Systems Biology Laboratory (KAUST), and Biosciences Core Laboratory (KAUST) for support and assistance.
The authors declare no competing financial interests.
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Veilleux, H., Ryu, T., Donelson, J. et al. Molecular processes of transgenerational acclimation to a warming ocean. Nature Clim Change 5, 1074–1078 (2015). https://doi.org/10.1038/nclimate2724
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