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Haplogroup O-M122
In human population genetics, haplogroups define the major lineages of direct paternal (male) lines back to a shared common ancestor in Africa. Haplogroup O-M122 is an Eastern Eurasian Y-chromosome haplogroup. The lineage has spread from Southeast Asia across East Asia. It dominates the paternal lineages there with extremely high frequencies.
This lineage is a descendant haplogroup of haplogroup O-M175.
==Origins==
Most researchers believe that O-M122 first appeared in Southeast Asia approximately 25,000-30,000 years ago . In a systematic sampling and genetic screening of an East Asian–specific Y-chromosome haplogroup (O-M122) in 2,332 individuals from diverse East Asian populations, results indicate that the O-M122 lineage is dominant in East Asian populations, with an average frequency of 44.3%. Microsatellite data show that the O-M122 haplotypes are more diverse in Southeast Asia than those in northern East Asia . This suggests a southern origin of the O-M122 mutation to be likely.
It was also part of the settlement of East Asia. However, the prehistoric peopling of East Asia by modern humans remains controversial with respect to early population migrations and the place of the O-M122 lineage in these migrations is ambivalent.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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