July 15, 2005

The southern origin of O3

Haplogroup O3 is the main Y-chromosome lineage present in modern East Asian Mongoloids. A new study sampled extensively East Asian populations to determine the time depth and geographical origin of this ancient and widespread marker.

American Journal of Human Genetics (Onlin early)

Y-Chromosome Evidence of Southern Origin of the East Asian–Specific Haplogroup O3-M122

Hong Shi et al.

The prehistoric peopling of East Asia by modern humans remains controversial with respect to early population migrations. Here, we present a systematic sampling and genetic screening of an East Asian–specific Y-chromosome haplogroup (O3-M122) in 2,332 individuals from diverse East Asian populations. Our results indicate that the O3-M122 lineage is dominant in East Asian populations, with an average frequency of 44.3%. The microsatellite data show that the O3-M122 haplotypes in southern East Asia are more diverse than those in northern East Asia, suggesting a southern origin of the O3-M122 mutation. It was estimated that the early northward migration of the O3-M122 lineages in East Asia occurred ∼25,000–30,000 years ago, consistent with the fossil records of modern humans in East Asia.


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