Genetic Variation and Diversity of Japanese Loach Inferred from Mitochondrial DNA

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  • ミトコンドリアDNAによるドジョウの遺伝特性
  • ミトコンドリアDNAによるドジョウの遺伝特性--チトクロームb遺伝子の塩基配列による系統解析
  • ミトコンドリア DNA ニ ヨル ドジョウ ノ イデン トクセイ チトクローム b イデンシ ノ エンキ ハイレツ ニ ヨル ケイトウ カイセキ
  • ―チトクローム<I>b</I>遺伝子の塩基配列による系統解析―
  • — Phylogenetic analysis using the cytochrome <i>b</i> gene sequences—

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We conducted a phylogenetic analysis of the cytochrome b gene sequences (1,131-bp) in mitochondrial DNA, to elucidate genetic variation and diversity of the loach Misgurnus anguillicaudatus population in Japan. There were 147 haplotypes that were identified from 444 specimens collected from 123 sites. The phylogenetic tree based on the maximum parsimony method indicated three clades (A, B and C). Clade A resembled genetically the European loach M. fossilis, and the haplotypes were distributed from the North Kanto region northward. Clade B was closely related to the Chinese loach M. anguillicaudatus, and the haplotypes were distributed over the South Tohoku region westward. Clade C that composed of seven subclades seemed to be endemic to Japan, and the haplotypes of these subclades indicated regional or nationwide distribution. Distribution of Clade A and B in Japan appeared to derive from not only artificial release of individuals imported recently from China or Korea, but also diastrophism related to formation processes of the Japanese Islands. Also the estimated divergence time for evolutionary separations between clades was from the upper Miocene to the lower Pliocene (7.4 to 3.8 mya).

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