A Cryptic Clonal Line of the Loach Misgurnus anguillicaudatus (Teleostei: Cobitidae) Evidenced by Induced Gynogenesis, Interspecific Hybridization, Microsatellite Genotyping and Multilocus DNA Fingerprinting
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概要
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In Memanbetsu town, Hokkaido island, Japan, a high frequency of natural triploid loaches Misgurnus anguillicaudatus (7.4% on average) was detected by flow cytometry for relative DNA content. Among sympatric diploid females (n=6) from a single population, we found two unique females that laid unreduced diploid eggs. They gave normal diploid progeny even after induction of gynogenesis with genetically inert UV-irradiated sperm. When fertilized with normal loach sperm, some unreduced eggs developed into triploids, but the rest into diploids. Hybridization using goldfish Carassius auratus sperm gave both normal diploid loaches and inviable allotriploid hybrids possessing the diploid loach genome and the haploid goldfish genome. Microsatellite genotyping and DNA fingerprinting demonstrated that the diploid progeny developing from the unreduced eggs were genetically identical to the mother, while the triploids had some of the paternal DNA. These results indicate that the diploid eggs reproduced unisexually as a diploid clone and in other cases developed into triploids after accidental incorporation of sperm nucleus. The presence of at least one clonal line in this area was shown by the identical DNA fingerprint detected in five out of 17 diploid loaches examined.
- 社団法人日本動物学会の論文
- 2002-05-25
著者
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YAMAHA Etsuro
Nanae Fresh Water Laboratory, Field Science Center for Northern Biosphere, Hokkaido University
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MORISHIMA KAGAYAKI
Graduate School of Fisheries Sciences, Hokkaido University
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ARAI KATSUTOSHI
Graduate School of Fisheries Sciences, Hokkaido University
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Morishima Kagayaki
Graduate School Of Fisheries Sciences Hokkaido University
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Horie Shin
Graduate School of Fisheries Sciences, Hokkaido University
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Yamaha Etsuro
Nanae Fresh Water Laboratory Field Science Center For Northern Biosphere Hokkaido University
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Yamaha Etsuro
Nanae Fish Culture Experimental Station Faculty Of Fisheries Hokkaido University
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Arai Katsutoshi
Graduate School Of Fisheries Sciences Hokkaido University
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Horie Shin
Graduate School Of Fisheries Sciences Hokkaido University
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Arai K
Laboratory Of Breeding Science Graduate School Of Fisheries Science Hokkaido University
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Arai Katsutoshi
Graduate School Of Biosphere Sciences Hiroshima University
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