Abstract
Although there are some documented examples on population dynamics of transposable elements (TEs) in model organisms, the evolutionary dynamics of TEs in domesticated species has not been systematically investigated. The objective of this study is to understand population dynamics of TEs during silkworm domestication. In this work, using transposon-display we examined the polymorphism of seven TE families [they represent about 59% of silkworm (Bombyx mori) total TE content] in four domesticated silkworm populations and one wild silkworm population. Maximum likelihood (ML) was used to estimate selection pressure. Population differentiation and structure were performed by using AMOVA analysis and program DISTRUCT, respectively. The results of transposon-display showed that significant differentiation occurred between the domesticated silkworm and wild silkworm. These TEs have experienced expansions and fixation in the domesticated silkworm but not in wild silkworm. Furthermore, the ML results indicated that purifying selection of TEs in the domesticated silkworm were significantly weaker than that in the wild silkworm. Interestingly, an adaptation insertion induced by BmMITE-2 was found, and this insertion can reduce the polymorphism of the flanking regions of its neighboring COQ7 gene. Our results suggested that TEs expanded and were fixed in the domesticated silkworm might result from demographic effects and artificial selection during domestication. We concluded that the data presented in this study have general implication in animal and crop improvements as well as in domestication of new species.
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Acknowledgements
We thank Dr. Zhou-He Du for his help in collecting wild silkworm samples and Dr. Fang-Yin Dai for his help in collecting domesticated silkworm samples. This work was supported by Fundamental and Advanced Research Project of Chongqing Municipality (No. cstc2016jcyjA0258 to MJH), the National Natural Science Foundation of China (No. 31401106 to MJH and No. 31560308 and 31700318 to HHZ), the Natural Science Foundation of Jiangxi Province (No. 20171BAB204016 to HHZ), Fundamental Research Funds for the Central Universities (SWU115035 to MJH), the China Postdoctoral Science Foundation (No. 2017M612891 to HHZ) and State Key Laboratory of Silkworm Genome Biology (No. sklsgb161718-8 to HHZ).
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HHZ, MJH and HEX designed the study. MJH, HEX, HHZ and XMX performed the experiments. MJH and HEX analyzed the data. HHZ and MJH drafted and revised the manuscript. All authors read and approved the final manuscript.
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13258_2018_713_MOESM10_ESM.pdf
Fig. S10—Likelihood curves and values of Nes. (A) Likelihood curves of Nes for domesticated silkworm population. Each color curve is representing one domesticated silkworm population. On each curve, the maximum likelihood Nes is showed. (B) Likelihood curves of Nes for wild silkworm population. The maximum likelihood Nes is showed. (C) The maximum likelihood Nes and 95% confidence intervals of each TE family in each population is showed (PDF 376 KB)
13258_2018_713_MOESM11_ESM.pdf
Fig. S11—Gels for detecting strains of BmMITE-2 present or absent in the domesticated silkworm. 1-23 represents DaoZao, ShangSanHuBan, DaoZaoN, FangSi, JiaQiu, DiWuBaiLuan, JianPuZhai, TuZhong-01, 655, ReHei, C108N, LuoSa8,DaXianTuZhong, HuangBo, WenZhouDiFangZhong, XuYiZhong, GaoHua, GaoBai, 872, J115, Fa408, YinDuZhong, Ou18, M represent DNA marker (PDF 417 KB)
13258_2018_713_MOESM12_ESM.pdf
Fig. S12—The phylogenetic tree was reconstructed by Bayesian approach. The phylogenetic tree was reconstructed based on sequences of CR regions for mitochondrial DNA. The red triangles represents strains that the BmMITE-2 present in the 3’UTR of COQ7 gene (NM001099608), others represents strains that the BmMITE-2 absent at this site. (PDF 347 KB)
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Han, MJ., Xu, HE., Xiong, XM. et al. Evolutionary dynamics of transposable elements during silkworm domestication. Genes Genom 40, 1041–1051 (2018). https://doi.org/10.1007/s13258-018-0713-1
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DOI: https://doi.org/10.1007/s13258-018-0713-1