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Dryad

Data from: Microbial solutions to dietary stress: Experimental evolution reveals host-microbiome interplay in Drosophila melanogaster

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Jan 16, 2025 version files 586.43 KB

Abstract

Can the microbiome serve as a reservoir of adaptive potential for hosts? To address this question, we leveraged ~150 generations of experimental evolution in Drosophila melanogaster in a stressful, high-sugar (HS) diet. We performed a fully reciprocal transplant experiment using the control and HS bacteria. If the microbiome confers benefits to hosts, then transplant recipients should gain fitness benefits compared to controls. Interestingly, we found that such benefits exist, but their magnitude depends on evolutionary history—mismatches between fly evolution and microbiome reduced fecundity and potentially exerted fitness costs, especially in the stressful HS diet. The dominant HS bacteria (​​Acetobacter pasteurianus) uniquely encoded several genes to enable uric acid degradation, mediating the toxic effects of uric acid accumulation due to the HS diet for flies. Our study demonstrates that host genotype x microbiome x environment interactions have substantial effects on host phenotype, highlighting how host evolution and ecological context together shape the adaptive potential of the microbiome.