Abstract
We investigated the source of spontaneous polyploidization in the critically endangered Acipenser mikadoi. Fourteen sib progeny of A. mikadoi and 11 hybrids between an A. mikadoi female and a Huso dauricus male, all showing atypically high ploidy, were analysed. Parent assignment based on five highly polymorphic microsatellite markers confirmed spontaneous duplication of maternal chromosome sets via retention of the second polar body to be the source of spontaneous polyploidization. To our knowledge, this provides the first evidence of the maternal origin of spontaneous polyploidization in A. mikadoi. Factorial correspondence analysis of the multilocus microsatellite genotypes placed the parent fish of spontaneous polyploids in clearly delineated clusters of A. mikadoi and H. dauricus, and parent fish had mitochondrial control region haplotypes corresponding to their presumed species. Thus, parent fish were confirmed to be of pure genetic origin, and hybridization did not promote the observed spontaneous polyploidization.
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Acknowledgements
The present study was financially supported in part by the Japan Society for the Promotion of Science [JSPS; KAKENHI grant nos. 21658067, 24248033 and 14F04751; the latter is a JSPS Postdoctoral Fellowship for Overseas Researchers through which Milos Havelka was supported]. The study was also financially supported in part by the Ministry of Education, Youth and Sports of the Czech Republic (Projects CENAKVA No. CZ.1.05/2.1.00/01.0024, and CENAKVA II No. LO1205, under the NPU I program), and the Czech Science Foundation (No. 14-28375P). The Lucidus Consultancy is gratefully acknowledged for the English corrections and suggestions.
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12562_2017_1083_MOESM1_ESM.xlsx
Supplementary material Table S1. Genotypes with private dam and sire alleles observed at all analysed loci for parent Acipenser mikadoi, spontaneous polyploids, and their full siblings with typical ploidy level of purebred A. mikadoi. (XLSX 37 kb)
12562_2017_1083_MOESM2_ESM.xlsx
Supplementary material Table S2. Genotypes with private dam and sire alleles observed at all analysed loci for parent A. mikadoi dam and Huso dauricus sire, spontaneous polyploids and their full siblings with typical ploidy level of hybrids A. mikadoi × H. dauricus. (XLSX 40 kb)
12562_2017_1083_MOESM3_ESM.pdf
Supplementary material Fig. S1. Scheme of investigation of the increase of private alleles in spontaneous polyploids. (PDF 2192 kb)
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Havelka, M., Zhou, H., Hagihara, S. et al. Spontaneous polyploidization in critically endangered Acipenser mikadoi . Fish Sci 83, 587–595 (2017). https://doi.org/10.1007/s12562-017-1083-3
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DOI: https://doi.org/10.1007/s12562-017-1083-3