Preliminary genetic characterization of two lineages of black rats (Rattus rattus sensu lato) in Japan, with evidence for introgression at several localities

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概要

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• We conducted a pilot survey of genetic diversity among 37 karyotyped individuals of the black rat Rattus rattus (sensu lato) from six localities on the Japanese Islands, using complete gene sequences of mitochondrial cytochrome b (cyt b) and nuclear interphotoreceptor retinoid binding protein (IRBP). Our sampling included two previously documented karyotypic groups: ‘Oceanian’ with 2n = 38 and ‘Asian’ with 2n = 42. Cyt b sequences for most individuals clustered according to their karyotypic groups, with an average between-group divergence of 3.8%. One exception was that individuals from Kagoshima (Kyushu Island) showed ‘Asian’ karyotypes combined with a cyt b haplotype that differed by a single nucleotide substitution from the haplotype of the ‘Oceanian’ karyotypic group. Six IRBP haplotypes were identified. They belonged to three distinct IRBP lineages (I-III), with an average inter-lineage divergence of 1%. Among homozygous individuals, these lineages showed good association with the karyotypic groups: IRBP lineage I occurred only with ‘Oceanian’ karyotypes, while IRBP lineages II and III both occurred with ‘Asian’ karyotypes. Individuals from Kagoshima all possessed IRBP of ‘Asian’ lineages, despite the presence of an ‘Oceanian’ mitochondrial type. The Chichijima population (Ogasawara Islands) featured exclusively ‘Asian’ karyotypes and cyt b sequences, but various combinations of all three IRBP lineages. The Kagoshima and Chichijima populations thus provide strong evidence of viable hybridization and genetic introgression between the two karyotypic groups, but with variable genetic outcomes. Our results demonstrate the potential of combined analysis of karyotypes and mitochondrial and nuclear gene sequences to elucidate the complex dispersal and population history of the black rat.

• 2005-10-25

著者

• 鈴木 仁

  北海道大学大学院地球環境科学研究院

• 土屋 公幸

  株式会社応用生物

• 鈴木 仁

  東京慈恵会医科大学

• 土屋 公幸

  宮崎医大

• 土屋 公幸

  宮崎医科大学附属動物実験施設

• 土屋 公幸

  応用生物(株)

• 土屋 公幸

  株式会社応用動物

• 土屋 公幸

  国立遺伝学研究所

• 土屋 公幸

  宮崎医科大学付属実験動物施設

• 鈴木 仁

  北大院・地球環境

• 鈴木 仁

  北大・院地球環境

• 土谷 公幸

  Experimental Animal Center Miyazaki Medical College

• Suzuki Hitoshi

  Laboratory of Ecology and Genetics, Graduate School of Environmental Earth Science, Hokkaido Univers

• Tsuchiya K

  Laboratory Of Wild Animals Department Of Animal Sciences Faculty Of Agriculture Tokyo University Of

• Tsuchiya Kimiyuki

  Applied Biology Co. Ltd. Tokyo Jpn

• Tsuchiya Kimiyuki

  Ooyo Seibutsu Inc.

• Tsuchiya Kimiyuki

  Laboratory Of Wild Animals Department Of Animal Sciences Tokyo University Of Agriculture

• Tsuchiya Kimisachi

  Department Of Agriculture Tokyo University Of Agriculture

• Tsuchiya K

  Department Of Zootechnical Sciences Faculty Of Agriculture Tokyo University Of Agriculture

• Tsuchiya K

  Miyazaki Medical Coll. Miyazaki Jpn

• Tsuchiya K

  Experimental Animal Center Miyazaki Medical College

• Tsuchiya K

  Tokyo Univ. Agriculture Kanagawa Jpn

• 土屋 公幸

  宮崎医科大学付属動物実験施設

• Tsuchiya Kimiyuki

  Department Zootechnical Science Tokyo University Of Agriculture

• Tsuchiya Kimiyuki

  Laboratory Of Wild Animals Department Of Zootechnical Sciences Faculty Of Agriculture

• Suzuki H

  Laboratory Of Ecology And Genetics Graduate School Of Environmental Earth Science Hokkaido Universit

• 鈴木 仁

  分子遺伝

• Tsuchiya Kimiyuki

  Laboratory Of Bioresources Applied Biology Co. Ltd.

• Tsuchiya Kimiyuki

  Department Of Agriculture Tokyo University Of Agriculture

• Aplin Ken

  Australian National Wildlife Collection Csiro Sustainable Ecosystems

• Suzuki Sosuke

  Kobe Quarantine Station

• Tsuchiya Kimiyuki

  Lab. Of Wild Animals Dep. Of Animal Sciences Fac. Of Agriculture Tokyo Univ. Of Agriculture

• Tsuchiya Kimiyuki

  Exp. Anim. Center Miyazaki Med. Coll.

• CHINEN Alejandro

  Laboratory of Ecology and Genetics, Graduate School of Environmental Earth Science, Hokkaido Univers

• Chinen Alejandro

  Laboratory Of Ecology And Genetics Graduate School Of Environmental Earth Science Hokkaido Universit

• Suzuki H

  Laboratory Of Ecology And Genetics Graduate School Of Environmental Earth Science Hokkaido Universit

• Suzuki Hitoshi

  Laboratory For Photobiology Photodynamics Research Center Riken

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