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Perceptive costs of reproduction drive ageing and physiology in male Drosophila

Abstract

Costs of reproduction are thought to result from natural selection optimizing organismal fitness within putative physiological constraints. Phenotypic and population genetic studies of reproductive costs are plentiful across taxa, but an understanding of their mechanistic basis would provide important insight into the diversity in life-history traits, including reproductive effort and ageing. Here, we dissect the causes and consequences of specific costs of reproduction in male Drosophila melanogaster. We find that key survival and physiological costs of reproduction arise from perception of the opposite sex, and they are reversed by the act of mating. In the absence of pheromone perception, males are free from reproductive costs on longevity, stress resistance and fat storage. The costs of perception and the benefits of mating are both mediated by evolutionarily conserved neuropeptidergic signalling molecules, as well as the transcription factor dFoxo. These results provide a molecular framework in which certain costs of reproduction arise as a result of self-imposed ‘decisions’ in response to perceptive neural circuits, which then orchestrate the control of life-history traits independently of physical or energetic effects associated with mating itself.

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Figure 1: Pheromone exposure, and not mating, drives the physiological costs of reproduction.
Figure 2: Pheromone exposure and mating drive separate global changes in the neurometabolome.
Figure 3: Self-imposed costs of reproduction are mediated by specific peptidergic neurons.
Figure 4: Self-imposed costs of reproduction are mediated through dFoxo signalling by a dILP2/3/5-independent mechanism.

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Acknowledgements

Members of the Pletcher laboratory provided comments on the experimental design and analysis. This research was supported by the US National Institutes of Health (R01AG030593 and R01AG051649 to S.D.P., R01AG049494 to D.E.L.P., and R01GM102279 to S.D.P and D.E.L.P.), the Glenn Medical Foundation (to S.D.P.), a Ruth L. Kirschstein National Research Service Award from NIA (F30AG048661, to Z.M.H.) and the University of Michigan Systems Biology Training Grant (T32GM008322, to Z.M.H.).

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Contributions

Z.M.H. and S.D.P. conceptualized the project, and Z.M.H., Y.L., D.E.L.P. and S.D.P. designed the experiments. Z.M.H., C.M.G. and J.C.J. performed the in vivo experiments, and Z.M.H., C.M.G. and S.D.P. analysed them. D.E.L.P. performed the metabolomics. Y.L. and S.D.P. analysed the metabolomics data, with input from Z.M.H. and D.E.L.P. S.K. created the NPF mutant used in Fig. 3. Z.M.H., Y.L. and S.D.P. wrote the manuscript, with comments from C.M.G. and D.E.L.P.

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Correspondence to Scott D. Pletcher.

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The authors declare no competing financial interests.

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Supplementary Figures 1–8; Supplementary Tables 1,2 (PDF 609 kb)

Supplementary File 1

Neurometabolomic dataset (XLSX 1208 kb)

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Harvanek, Z., Lyu, Y., Gendron, C. et al. Perceptive costs of reproduction drive ageing and physiology in male Drosophila. Nat Ecol Evol 1, 0152 (2017). https://doi.org/10.1038/s41559-017-0152

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