Abstract
The microbiota consists of microbes living in or on an organism and has been implicated in host health and function. Environmental and host-related factors were shown to shape host microbiota composition and diversity in many fish species, but the role of host quantitative architecture across populations and among families within a population is not fully characterized. Here, Chinook salmon were used to determine if inter-population differences and additive genetic variation within populations influenced the gut microbiota diversity and composition. Specifically, hybrid stocks of Chinook salmon were created by crossing males from eight populations with eggs from an inbred line created from self-fertilized hermaphrodite salmon. Based on high-throughput sequencing of the 16S rRNA gene, significant gut microbial community diversity and composition differences were found among the hybrid stocks. Furthermore, additive genetic variance components varied among hybrid stocks, indicative of population-specific heritability patterns, suggesting the potential to select for specific gut microbiota composition for aquaculture purposes. Determining the role of host genetics in shaping their gut microbiota has important implications for predicting population responses to environmental changes and will thus impact conservation efforts for declining populations of Chinook salmon.
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Acknowledgements
This study is part of a larger cooperative project that involved the dedicated work of many researchers, and for their assistance in the field, we would like to acknowledge the following: N. Bernier, J. Camaj, E. Deck, A. Forest, X. He, K. O’Hagan-Wang, J. Drown, J.W. Heath, V.A. Heath, and J. Smit. We would like to thank Yellow Island Aquaculture, Ltd. for their invaluable logistical, financial, and technical support. This study was funded by a Natural Science and Engineering Research Council (NSERC) of Canada Strategic Partnership Grant and an NSERC Discovery Grant to DDH.
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DDH conceived and planned the experiments. DDH and SRC carried out field work. MZ carried out the wet laboratory sample preparations and experiments. All authors contributed to selecting the models and the computational framework for the data analysis. MZ, SRC, and DDH contributed to the interpretation of the results. MZ took the lead in performing the research, analyzing data and writing the manuscript. All authors provided critical feedback and helped shape the research, analysis, and manuscript.
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Ziab, M., Chaganti, S.R. & Heath, D.D. The effects of host quantitative genetic architecture on the gut microbiota composition of Chinook salmon (Oncorhynchus tshawytscha). Heredity 131, 43–55 (2023). https://doi.org/10.1038/s41437-023-00620-x
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DOI: https://doi.org/10.1038/s41437-023-00620-x