Haplogroup B (mtDNA)


In human mitochondrial genetics, haplogroup B is a human mitochondrial DNA haplogroup.

Origin

Haplogroup B is believed to have arisen in Asia some 50,000 years before present. Its ancestral haplogroup was haplogroup R.
The greatest variety of haplogroup B is in China. It is therefore likely that it underwent its earliest diversification in mainland East or South East Asia.

Distribution

Basal B was found in Upper Paleolithic Tianyuan man.
Haplogroup B is now most common among populations native to Southeast Asia, as well as speakers of Sino-Tibetan languages and Austronesian languages.
A subclade of B4b is one of five haplogroups found among the indigenous peoples of the Americas, the others being A, C, D, and X.
Because the migration to the Americas by the ancestors of indigenous Americans is generally believed to have been from northeastern Siberia via Beringia, it is surprising that Haplogroup B and Haplogroup X have not been found in Paleo-Siberian tribes of northeastern Siberia. However, Haplogroup B has been found among Turkic, Mongolic, and Tungusic populations of Siberia, such as Tuvans, Altays, Shors, Khakassians, Yakuts, Buryats, Mongols, Negidals, and Evenks. This haplogroup is also found among populations in China, Indonesia, Iran, Iraq, Japan, Korea, Laos, Madagascar, Malaysia, Melanesia, Micronesia, Mongolia, the Philippines, Polynesia, Thailand, and Vietnam.
Although haplogroup B in general has been found in many Siberian population samples, the subclade that is phylogenetically closest to American B2, namely B4b1, has been found mainly in populations of southern China and Southeast Asia, especially Filipinos and Austronesian speakers of eastern Indonesia and the aborigines of Taiwan and Hainan. However, B4b1 has been observed in populations as far north as Turochak and Choya districts in the north of Altai Republic, Miyazaki and Tokyo, Japan, South Korea, Tuva, and Hulunbuir.

Table of Frequencies of MtDNA Haplogroup B

Subclades

Tree

This phylogenetic tree of haplogroup B subclades is based on the paper by Mannis van Oven and Manfred Kayser Updated comprehensive phylogenetic tree of global human mitochondrial DNA variation and subsequent published research.
In his popular book The Seven Daughters of Eve, Bryan Sykes named the originator of this mtDNA haplogroup Ina.