著者

Xiayire Xiaokaiti Takao Sato Kenji Kasai Kenichi Machida Kyomi Yamazaki Naomitsu Yamaji Hiroki Kikuchi Jun Gojobori Hitomi Hongo Yohey Terai Takashi Gakuhari

出版者

The Anthropological Society of Nippon

雑誌

Anthropological Science (ISSN:09187960)

巻号頁・発行日

pp.230617, (Released:2023-10-24)

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Archaeological evidence indicates that dogs appeared in Japan at least 9300 years ago, dur‍ing the Jomon period. The Jomon period dogs (Jomon dogs) retained the morphological characteristics of ancient domestic dogs throughout the Jomon period, possibly due to their geographical isolation ‍from continental dogs. Therefore, we expect them to retain the genetic characteristics of ancient domestic dogs. To explore this possibility, we determined the mitochondrial genomes of five Jomon dogs, including one of the oldest dogs in Japan (7400–7200 cal BP), and seven late-8th-century Japanese dogs (Suwada dogs). We analyzed these sequences with 719 mitochondrial genomes of an‍cient and modern canids. The dog mitochondrial DNA (mtDNA) sequences have been grouped into six clades (haplogroups A–F), and clade A comprises six sub-clades (sub-haplogroups A1–A6). Classification of the Jomon dogs’ mtDNA haplotypes revealed that these dogs belong to a nested A2/A3 sub-‍haplogroup not shared by other modern or ancient samples. The mtDNA sequences of Jomon dogs ‍form a monophyletic clade which is sister to the A3 sub-clade in the phylogenetic trees. Network analysis showed that the Jomon dogs’ mtDNA sub-clade diverged close to the base of the A2 and A3 haplotype network, which was centered by an ancient dog from South China. The Jomon dog mtDNAs diverged from A3 (~11500 years ago) soon after the A2 and A3 divergence (~12800 years ago), in‍di‍cating early divergence of the Jomon dogs’ sub-clade. These results suggest that the Jomon dogs were possibly introduced into the Japanese archipelago 11500–9300 years ago. The mtDNAs of late-8th-century dogs were more diverse and were different haplogroups than that of Jomon dogs, sug‍gesting that other haplogroups likely replaced the haplogroup of Jomon dogs through the introduction of dogs that accompanied the migration of people into Japan in later periods.

著者

Ryutaro Miyagi Yohey Terai

出版者

The Genetics Society of Japan

雑誌

Genes & Genetic Systems (ISSN:13417568)

巻号頁・発行日

vol.88, no.3, pp.145-153, 2013 (Released:2013-09-11)

参考文献数

76

被引用文献数

11 14

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The amazing coloration shown by diverse cichlid fish not only fascinates aquarium keepers, but also receives great attention from biologists interested in speciation because of its recently-revealed role in their adaptive radiation in an African lake. We review the important role of coloration in the speciation and adaptive evolution of Lake Victoria cichlids, which have experienced adaptive radiation during a very short evolutionary period. Mature male cichlids display their colors during mate choice. The color of their skin reflects light, and the reflected light forms a color signal that is received by the visual system of females. The adaptive divergence of visual perceptions shapes and diverges colorations, to match the adapted visual perceptions. The divergence of visual perception and coloration indicates that the divergence of color signals causes reproductive isolation between species, and this process leads to speciation. Differences in color signals among coexisting species act to maintain reproductive isolation by preventing hybridization. Thus, the diversity of coloration has caused speciation and has maintained species diversity in Lake Victoria cichlids.