Extensive interbreeding occurred among multiple matriarchal ancestors during the domestication of dogs : Evidence from inter-and intraspecies polymorphisms in the D-loop region of mitochondrial DNA between dogs and wolves
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概要
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To test the hypothesis that the domestic dogs are derived from several different ancestral gray wolf populations, we compared the sequence of the displacement (D)-loop region of the mitochondrial DNA (mtDNA) from 24 breeds of domestic dog (34 individual dogs) and 3 subspecies of gray wolf (Canis lupus lupus, C. l. pallipes and C. l. chanco; 19 individuals). The intraspecific sequence variations within domestic dogs (0.00~3.19%) and within wolves (0.00~2.88%) were comparable to the interspecific variations between domestic dogs and wolves (0.30~3.35%). A repetitive sequence with repeat units (TACACGTA/GCG) that causes the size variation in the D-loop region was also found in both dogs and wolves. However, no nucleotide substitutions or repetitive arrays were specific for domestic dogs or for wolves. These results showed that there is a close genetic relationship between dogs and wolves. Two major clades appeared in the phylogenetic trees constructed by neighbor-joining and by the maximum parsimony method; one clade containing Chinese wolf (C. l. chanco) showed extensive variations while the other showed only slight variation. This showed that there were two major genetic components both in domestic dogs and in wolves. However, neither clades nor haplotypes specific for any dog breed were observed, whereas subspecies-specific clades were found in Asiatic wolves. These results suggested that the extant breeds of domestic dogs have maintained a large degree of mtDNA polymorphisms introduced from their ancestral wolf populations, and that extensive interbreedings had occurred among multiple matriarchal origins.
- 日本遺伝学会の論文
著者
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YONEKAWA Hiromichi
Department of Laboratory Animal Science, The Tokyo Metropolitan Institute of Medical Science
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KIKKAWA Yoshiaki
Department of Bioindustry, Tokyo University of Agriculture
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Yonekawa Hiromichi
Department Of Laboratory For Animal Science Tokyo Metropolitan Institute Of Medical Science
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Yonekawa Hiromichi
Tokyo Metropolitan Inst. Of Medical Sci.
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Yonekawa Hiromichi
Department Of Laboratory Animal Science The Tokyo Metripolitan Institute Of Medical Science
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Yonekawa Hiromichi
Dep. Of Lab. Animal Sci. The Tokyo Metropolitan Inst. Of Medical Sci.
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Yonekawa Hiromichi
Department Of Laboratory Animal Science The Tokyo Metropolitan Institute Of Medical Science (rinshok
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TSUDA Kaoru
Department of Laboratory Animal science, The Tokyo Metropolitan Institute of Medical Science
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TSUDA Kaoru
RIKEN BioResource Center
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Tsuda Kaoru
Department Of Laboratory Animal Science The Tokyo Metropolitan Institute Of Medical Science
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Kikkawa Y
Department Of Laboratory Animal Science The Tokyo Metropolitan Institute Of Medical Science
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Yonekawa H
Department Of Laboratory Animal Science The Tokyo Metroporitan Institute Of Medical Science
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Tanabe Yuichi
Deparmtnet Of Poultry And Animal Sciences Gifu University
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Kikkawa Y
Tokyo Metropolitan Inst. Medical Sci. Tokyo Jpn
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Yonekawa H
Tokyo Metropolitan Inst. Of Medical Sci.
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Yonekawa Hiromichi
Department Of Animal Science The Tokyo Metropolitan Institute Of Medical Science
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Kikkawa Yoshiaki
Department Of Bioindustry Tokyo University Of Agriculture
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Tsuda Kaoru
Department of Animal Science and Biotechnology, School of Veterinary Medicine, Azabu University
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Tanabe Yuichi
Department of Animal Science and Biotechnology, School of Veterinary Medicine, Azabu University
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