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Haplogroup D-M55

Human Y-chromosome DNA haplogroup From Wikipedia, the free encyclopedia

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Haplogroup D-M55 (M64.1/Page44.1) also known as Haplogroup D1a2a is a Y-chromosome haplogroup. It is one of two branches of Haplogroup D1a. The other is D1a1, which is found with high frequency in Tibetans and other Tibeto-Burmese populations and geographical close groups. D is also distributed with low to medium frequency in Central Asia, East Asia, and Mainland Southeast Asia.

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Haplogroup D-M55 is found in about 33%[4][5][6][7][8] of present-day Japanese males. It has been found in fourteen of a sample of sixteen or 87.5% of a sample of Ainu males in one study published in 2004[9] and in three of a sample of four or 75% of a sample of Ainu males in another study published in 2005 in which some individuals from the 2004 study may have been retested.[5] It is currently the most common Y-DNA haplogroup in Japan if O1-F265 and O2-M122 (TMRCA approx. 30,000 ~ 35,000 ybp) are considered as separate haplogroups.

In 2017 it was confirmed that the Japanese branch of haplogroup D-M55 is distinct and isolated from other branches of haplogroup D since about 50,000 years ago. The split in D1a may have occurred near the Tibetan Plateau.[10]

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History

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Migration route of haplogroup D
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Migration route of Y-DNA haplogroups in East Asia

Among the subgroups of Haplogroup D, the ancestor of D-M55 went eastward to reach the Japanese archipelago.[11] According to Michael F. Hammer of the University of Arizona, haplogroup D originated near the Tibetan Plateau and migrated into Japan where it eventually became D-M55.[12] Mitsuru Sakitani said that Haplogroup D1 came from Tibet to northern Kyushu via the Altai Mountains and the Korean Peninsula more than 50,000 years ago, and Haplogroup D-M55 (D1a2a) was born in the Japanese archipelago.[11]

Recent studies suggest that D-M55 became dominant during the late Jōmon period, shortly before the arrival of the Yayoi, suggesting a population boom and bust.[13]

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Frequency

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The average frequency in Japanese is about 30%.[4][5][7][8] High frequencies are found in various places in Japan, especially in Hokkaidō, eastern Honshū, southern Kyūshū, and Okinawa.

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Ancient DNA

A Jōmon period man excavated from Funadomari remains (about 3,800 - 3,500 YBP) in Rebun Island in Hokkaido belongs to Haplogroup D1a2a2a(D-CTS220).[21]

The analysis of a Jōmon sample (Ikawazu) and an ancient sample from the Tibetan Plateau (Chokhopani, Ch) found only partially shared ancestry, suggesting a positive genetic bottleneck regarding the spread of haplogroup D from an ancient population related to the Tibetan Chokhopani sample (and modern Tibeto-Burmese groups).[22]

Phylogenetic tree

By ISOGG tree(Version: 14.151).[23]

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References

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