Abstract
Trypsin participates in many fundamental biological processes, the most notably in digesting food. The 12 species of Drosophila provide a great opportunity to analyze the duplication pattern of trypsins and their association with dietary changes. Here, we find that the trypsin family expands dramatically after speciation. The duplication events are strongly related to the host preferences, with significantly more copy numbers in species breeding on rotting fruits. Temporal analysis of the duplication events indicates that the occurrences of these events are not simultaneous, but rather correlate to the ecological change or host shift. Furthermore, we find that the specialists and generalists have different adaptive selections, which is revealed by dynamic duplication and/or deletion and relatively high Ka/Ks values on the duplicated events in specialists. Our findings suggest that the duplication of trypsin genes has played an important role in the adaption of Drosophila to the diverse ecosystems.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (30970198, 0930008 and J1103512) and Qing Lan Project to S.Y. We thank Robin Burns for helpful discussions and suggestions on the manuscript, which significantly improved the writing.
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The authors declare that they have no competing interests.
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Li, L., Memon, S., Fan, Y. et al. Recent duplications drive rapid diversification of trypsin genes in 12 Drosophila . Genetica 140, 297–305 (2012). https://doi.org/10.1007/s10709-012-9682-5
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DOI: https://doi.org/10.1007/s10709-012-9682-5