Page "Japanese people" Paragraph 35

A 2005 study by Michael F. Hammer reports genetic similarities between the Japanese and several other Asian populations, which shows that the common Y-DNA haplogroups of Japanese are D-P37. 1 ( 34. 7 %), O-P31 ( 31. 7 %), O-M122 ( 20. 1 %), C-M8 ( 5. 4 %), C-M217 ( 3. 1 %), NO ( 2. 3 %) and N ( 1. 5 %).

The patrilines belonging to D-P37. 1 are found in all Japanese groups, but are more frequently found in Ainu ( 75. 0 %) and Okinawa ( 55. 6 %) and are less frequently found in Shikoku ( 25. 7 %) and Kyushu ( 26. 4 %).

Haplogroup O and C-M8 are not found in Ainu, and C-M217 is not found in Okinawa.

Haplogroup N is detected in samples of central Japanese, but is not found in Ainu and Okinawa.

This study, and others, report that Y-chromosome patrilines crossed from the Asian mainland into the Japanese archipelago, and continue to make up a large proportion of the Japanese male lineage.

If focusing haplogroup O-P31 in those researches, the patrilines derived from its subclade O-SRY465 are frequently found in both Japanese ( mean 32 %, with frequency in various samples ranging from 26 % to 36 %) and Koreans ( mean 30 %, with frequency in various samples ranging from 19 % to 40 %).

According to the research, these patrilines have undergone extensive genetic admixture with the Jōmon period populations previously established in Japan.