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mt DNA haplogroup A which is widespread in Asia today occurs at levels below 10%, but reaches higher concentrations in some parts of China, Korea and Japan.“Some ethnic Chinese populations, such as the Dong and the Yi, carry haplogroup A at levels as high as 30%.The second most frequent haplogroup V in Korean was not present in Chinese, but its frequency was similar in Japanese.
It was also the most frequent haplogroup in Chinese (95%) as well as in Japanese (45%).
The frequencies of the haplogroups V, IV, and X were 15.4%, 1%, and 1%, respectively.
Surprisingly, Japanese also display the highest frequency of haplogroup O3a5, which is a Han Chinese and Sino-Tibetan specific O3 branch.
Japanese Haplogroup O3a5 (O3e) 10/47= 23% This frequency is about 5% higher than the frequency of O3a5 among Manchus, Koreans and other Northeast Asians.
Another study published in 2005 on 81 sets of Y chromosomes of six populations across Japan showed: – The Japanese have at least two very deep pre-Yayoi ancestral Y chromosome lineages (D-P37.1 and C-M8) that descend from Paleolithic founders who had diverged from the mainland and that were then isolated from those populations on the mainland for a very long time.
Scientists thought these D lineages to mean the Jomon populations in Japan once upon a time the same ancestors as Tibetans from central Asia who are found with the highest frequency of continental D lineages is found in central Asia.The Ainu who are widely considered to be of the “old” proto-Mongoloid stock closely related to the Tibetan Buryat and Yakut peoples, and descended from the Jomon people who lived in the Tohoku area until they were later pushed northwards into Hokkaido, afterwhich they resided around the Sea of Okhotsk, mainly Hokkaido, Sakhalin, Kuril Islands and the tip of Kamchatka.However, the DNA sequences show that Ainu are actually more remotely distanced from the Jomon than is commonly believed, as they were influenced by Siberians (as with Koreans).This means that Japanese origins were not as prominently from Siberia as was commonly thought, since Japanese bear more of C1, whereas C3 is found only in northern populations of Japan.Haplogroup D was observed among Japanese (25%) and Tibetans (40%); it was also observed among Han Chinese, Mongolians and Koreans.M9, which appears to have arisen in Tibet.] While Haplogroup M is widespread throughout South and East Asia, it originates from the Indian sub-continent where it is more diverse on there than anywhere else in the world.Overall, Japanese are closest to Tibetans and Han Chinese, but only marginally more so than to the Koreans.Recently, diversity on the nonrecombining portion of the Y chromosome (NRY) has been applied to the study of human history.Since NRY is passed from father to son without recombination, polymorphisms in this region are valuable for investigating male-mediated gene flow and for complementing maternally based studies of mt DNA.The DNA sequence SNP study done by Japanese researchers in 2005 (the biggest contributor of DNA of each East Asian people is bolded) showed the following results: Korean DNA sequence is made up of: 40.6% Uniquely Korean 21.9% Chinese 1.6% Ainu 17.4% Okinawan 18.5% Unidentified Japanese DNA sequence is made up of: 4.8% Uniquely Japanese 24.2% Korean 25.8% Chinese 8.1% Ainu 16.1% Okinawan 21% Unidentified Chinese DNA sequence is made up of: 60.6% Uniquely Chinese 1.5% Japanese 10.6% Korean 1.5% Ainu 10.6% Okinawan 15.2% Unidentified The biggest components in Japanese are Chinese, Korean, Okinawan.A closer look at the Chinese gene pool The shared Chinese gene pool between Japanese and Koreans is thought to be formed of Dong-Yi stock (originating from China’s Shandong peninsula) that later formed the Puyo peoples of the Paekche kingdom and Koguyro kingdoms of the Korean peninsula.