The Promise of Cross-Species Coexpression Analysis in Studying the Coevolution and Ecology of Host-Symbiont Interactions
Measuring gene expression simultaneously in both hosts and symbionts offers a powerful approach to explore the biology underlying species interactions. Such dual or simultaneous RNAseq approaches have primarily been used to gain insight into gene function in model systems, but there is opportunity to expand and apply these tools in new ways to understand ecological and evolutionary questions. By incorporating genetic diversity in both hosts and symbionts and studying how gene expression is correlated between partner species, we can gain new insight into host-symbiont coevolution and the ecology of species interactions. In this perspective, we explore how these relatively new tools could be applied to study such questions. We review the mechanisms that could be generating patterns of cross-species gene coexpression, including indirect genetic effects and selective filters, how these tools could be applied across different biological and temporal scales, and outline other methodological considerations and experiment possibilities.
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