Interploidy gene flow involving the sexual-asexual cycle facilitates the diversification of gynogenetic triploid Carassius fish
Abstract Asexual vertebrates are rare and at risk of extinction due to their restricted adaptability through the loss of genetic recombination. We explore the mechanisms behind the generation and maintenance of genetic diversity in triploid asexual (gynogenetic) Carassius auratus fish, which is wide...
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Nature Portfolio
2021
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oai:doaj.org-article:60c8c7c33c624c4da01a754688d6ed5b2021-11-21T12:19:53ZInterploidy gene flow involving the sexual-asexual cycle facilitates the diversification of gynogenetic triploid Carassius fish10.1038/s41598-021-01754-w2045-2322https://doaj.org/article/60c8c7c33c624c4da01a754688d6ed5b2021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-01754-whttps://doaj.org/toc/2045-2322Abstract Asexual vertebrates are rare and at risk of extinction due to their restricted adaptability through the loss of genetic recombination. We explore the mechanisms behind the generation and maintenance of genetic diversity in triploid asexual (gynogenetic) Carassius auratus fish, which is widespread in East Asian fresh waters and exhibits one of the most extensive distribution among asexual vertebrates despite its dependence on host sperm. Our analyses of genetic composition using dozens of genetic markers and genome-wide transcriptome sequencing uncover admixed genetic composition of Japanese asexual triploid Carassius consisting of both the diverged Japanese and Eurasian alleles, suggesting the involvement of Eurasian lineages in its origin. However, coexisting sexual diploid relatives and asexual triploids in Japan show regional genetic similarity in both mitochondrial and nuclear markers. These results are attributed to a unique unidirectional gene flow from diploids to sympatric triploids, with the involvement of occasional sexual reproduction. Additionally, the asexual triploid shows a weaker population structure than the sexual diploid, and multiple triploid lineages coexist in most Japanese rivers. The generated diversity via repeated interploidy gene flow as well as an increased establishment of immigrants is assumed to offset the cost of asexual reproduction and might contribute to the successful broad distribution of this asexual vertebrate.Tappei MishinaHirohiko TakeshimaMikumi TakadaKei’ichiro IguchiChunguang ZhangYahui ZhaoRyouka Kawahara-MikiYasuyuki HashiguchiRyoichi TabataTakeshi SasakiMutsumi NishidaKatsutoshi WatanabeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021) |
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Medicine R Science Q Tappei Mishina Hirohiko Takeshima Mikumi Takada Kei’ichiro Iguchi Chunguang Zhang Yahui Zhao Ryouka Kawahara-Miki Yasuyuki Hashiguchi Ryoichi Tabata Takeshi Sasaki Mutsumi Nishida Katsutoshi Watanabe Interploidy gene flow involving the sexual-asexual cycle facilitates the diversification of gynogenetic triploid Carassius fish |
| description |
Abstract Asexual vertebrates are rare and at risk of extinction due to their restricted adaptability through the loss of genetic recombination. We explore the mechanisms behind the generation and maintenance of genetic diversity in triploid asexual (gynogenetic) Carassius auratus fish, which is widespread in East Asian fresh waters and exhibits one of the most extensive distribution among asexual vertebrates despite its dependence on host sperm. Our analyses of genetic composition using dozens of genetic markers and genome-wide transcriptome sequencing uncover admixed genetic composition of Japanese asexual triploid Carassius consisting of both the diverged Japanese and Eurasian alleles, suggesting the involvement of Eurasian lineages in its origin. However, coexisting sexual diploid relatives and asexual triploids in Japan show regional genetic similarity in both mitochondrial and nuclear markers. These results are attributed to a unique unidirectional gene flow from diploids to sympatric triploids, with the involvement of occasional sexual reproduction. Additionally, the asexual triploid shows a weaker population structure than the sexual diploid, and multiple triploid lineages coexist in most Japanese rivers. The generated diversity via repeated interploidy gene flow as well as an increased establishment of immigrants is assumed to offset the cost of asexual reproduction and might contribute to the successful broad distribution of this asexual vertebrate. |
| format |
article |
| author |
Tappei Mishina Hirohiko Takeshima Mikumi Takada Kei’ichiro Iguchi Chunguang Zhang Yahui Zhao Ryouka Kawahara-Miki Yasuyuki Hashiguchi Ryoichi Tabata Takeshi Sasaki Mutsumi Nishida Katsutoshi Watanabe |
| author_facet |
Tappei Mishina Hirohiko Takeshima Mikumi Takada Kei’ichiro Iguchi Chunguang Zhang Yahui Zhao Ryouka Kawahara-Miki Yasuyuki Hashiguchi Ryoichi Tabata Takeshi Sasaki Mutsumi Nishida Katsutoshi Watanabe |
| author_sort |
Tappei Mishina |
| title |
Interploidy gene flow involving the sexual-asexual cycle facilitates the diversification of gynogenetic triploid Carassius fish |
| title_short |
Interploidy gene flow involving the sexual-asexual cycle facilitates the diversification of gynogenetic triploid Carassius fish |
| title_full |
Interploidy gene flow involving the sexual-asexual cycle facilitates the diversification of gynogenetic triploid Carassius fish |
| title_fullStr |
Interploidy gene flow involving the sexual-asexual cycle facilitates the diversification of gynogenetic triploid Carassius fish |
| title_full_unstemmed |
Interploidy gene flow involving the sexual-asexual cycle facilitates the diversification of gynogenetic triploid Carassius fish |
| title_sort |
interploidy gene flow involving the sexual-asexual cycle facilitates the diversification of gynogenetic triploid carassius fish |
| publisher |
Nature Portfolio |
| publishDate |
2021 |
| url |
https://doaj.org/article/60c8c7c33c624c4da01a754688d6ed5b |
| work_keys_str_mv |
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