K
Keiichi Omoto
Researcher at University of Tokyo
Publications - 98
Citations - 2454
Keiichi Omoto is an academic researcher from University of Tokyo. The author has contributed to research in topics: Population & Allele. The author has an hindex of 24, co-authored 98 publications receiving 2392 citations. Previous affiliations of Keiichi Omoto include International Research Center for Japanese Studies & University of St Andrews.
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Journal ArticleDOI
Dual origins of the Japanese: common ground for hunter-gatherer and farmer Y chromosomes
Michael F. Hammer,Tatiana M. Karafet,Hwayong Park,Keiichi Omoto,Shinji Harihara,Mark Stoneking,Satoshi Horai +6 more
TL;DR: Coalescent analyses of Y chromosome short tandem repeat diversity indicated that haplogroups D and C began their expansions in Japan ∼20,000 and ∼12,000 years ago, respectively, while haplogroup O-47z began its expansion only ∼4,400 years ago.
Journal Article
mtDNA polymorphism in East Asian Populations, with special reference to the peopling of Japan.
Satoshi Horai,K. Murayama,K. Hayasaka,S. Matsubayashi,Y. Hattori,Goonnapa Fucharoen,Shinji Harihara,Kyung Sook Park,Keiichi Omoto,I.-H. Pan +9 more
TL;DR: The results of this study are compatible with the hybridization model on the origin of modern Japanese, and it is suggested that approximately 65% of the gene pool in mainland Japanese was derived from the continental gene flow after the Yayoi Age.
Journal ArticleDOI
Genetic Origins of the Japanese: A Partial Support for the Dual Structure Hypothesis
Keiichi Omoto,Naruya Saitou +1 more
TL;DR: A modified version of the dual structure model is proposed which may explain the genetic, morphological, and archaeological evidence concerning the formation of modern Japanese populations.
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Genetic origins of the Ainu inferred from combined DNA analyses of maternal and paternal lineages
Atsushi Tajima,Masanori Hayami,Katsushi Tokunaga,Takeo Juji,Masafumi Matsuo,Sangkot Marzuki,Keiichi Omoto,Satoshi Horai +7 more
TL;DR: The present findings suggest that the Ainu retain a certain degree of their own genetic uniqueness, while having higher genetic affinities with other regional populations in Japan and the Nivkhi among Asian populations.
Journal ArticleDOI
Y chromosome markers and trans-bering strait dispersals
Tatiana M. Karafet,Stephen L. Zegura,Jennifer Vuturo-Brady,Olga L. Posukh,Ludmila P. Osipova,Victor Wiebe,Francine C. Romero,Jeffrey C. Long,Shinji Harihara,Feng Jin,Bumbein Dashnyam,Tudevdagva Gerelsaikhan,Keiichi Omoto,Michael F. Hammer +13 more
TL;DR: Data do not support the Greenberg et al. (1986) tripartite model for the early peopling of the Americas and the perplexing presence of the 1T haplotype in northeastern Siberia may be due to back-migration from the New World to Asia.