Haplogroup O-M268


In human genetics, Haplogroup O-M268, also known as O1b, is a Y-chromosome DNA haplogroup. Haplogroup O-M268 is a primary subclade of haplogroup O-F265, itself a primary descendant branch of Haplogroup O-M175.

Origin

In a paper published in 2011 by a group of Chinese researchers affiliated with Fudan University, it has been suggested that China is the origin of the expansion of haplogroup O-P31.

Distribution

Haplogroup O-P31 is notable for the peculiarities of its geographical distribution. Like all clades of Haplogroup O-M175, Haplogroup O-P31 is found only among the males of modern Eastern Eurasian populations. However, Haplogroup O-P31 is generally found with high frequency only among certain populations, such as the Austroasiatic peoples of India, Bangladesh and Southeast Asia, the Nicobarese of the Nicobar Islands in the Indian Ocean, Koreans, and Japanese.
Besides its widespread and patchy distribution, Haplogroup O1b-P31 is also notable for the fact that it can be divided into three major subclades that show almost completely disjunct distribution. One of these subclades, O1B1-K18 can be mainly divided into two subclades O1b1a1-PK4 and O1b1a2-PAGE59. O1b1a1-PK4 is found among some populations of South and Southeast Asia, as well as among the Japanese of Japan, the Balinese of Indonesia and Southern China. O1b1a2-PAGE59 is relatively rare and mainly distributed in East Asia, especially in Han Chinese. Another subclade, Haplogroup O1b2-M176, is found almost exclusively among the Japanese, Koreans, and some Manchurians.

Phylogenetics

Phylogenetic History

Prior to 2002, there were in academic literature at least seven naming systems for the Y-Chromosome Phylogenetic tree. This led to considerable confusion. In 2002, the major research groups came together and formed the Y-Chromosome Consortium. They published a joint paper that created a single new tree that all agreed to use. Later, a group of citizen scientists with an interest in population genetics and genetic genealogy formed a working group to create an amateur tree aiming at being above all timely. The table below brings together all of these works at the point of the landmark 2002 YCC Tree. This allows a researcher reviewing older published literature to quickly move between nomenclatures.
YCC 2002/2008 ''''''YCC 2002 YCC 2005 YCC 2008 YCC 2010r ISOGG 2006ISOGG 2007ISOGG 2008ISOGG 2009ISOGG 2010ISOGG 2011ISOGG 2012
O-M17526VII1U28Eu16H9IO*OOOOOOOOOO
O-M11926VII1U32Eu16H9HO1*O1aO1aO1aO1aO1aO1aO1aO1aO1aO1a
O-M10126VII1U32Eu16H9HO1aO1a1O1a1aO1a1aO1a1O1a1O1a1aO1a1aO1a1aO1a1aO1a1a
O-M5026VII1U32Eu16H10HO1bO1a2O1a2O1a2O1a2O1a2O1a2O1a2O1a2O1a2O1a2
O-P3126VII1U33Eu16H5IO2*O2O2O2O2O2O2O2O2O2O2
O-M9526VII1U34Eu16H11GO2a*O2aO2aO2aO2aO2aO2aO2aO2aO2a1O2a1
O-M8826VII1U34Eu16H12GO2a1O2a1O2a1O2a1O2a1O2a1O2a1O2a1O2a1O2a1aO2a1a
O-SRY46520VII1U35Eu16H5IO2b*O2bO2bO2bO2bO2bO2bO2bO2bO2bO2b
O-47z5VII1U26Eu16H5IO2b1O2b1aO2b1O2b1O2b1aO2b1aO2b1O2b1O2b1O2b1O2b1
O-M12226VII1U29Eu16H6LO3*O3O3O3O3O3O3O3O3O3O3
O-M12126VII1U29Eu16H6LO3aO3aO3a1O3a1O3a1O3a1O3a1O3a1O3a1O3a1aO3a1a
O-M16426VII1U29Eu16H6LO3bO3bO3a2O3a2O3a2O3a2O3a2O3a2O3a2O3a1bO3a1b
O-M15913VII1U31Eu16H6LO3cO3cO3a3aO3a3aO3a3O3a3O3a3aO3a3aO3a3aO3a3aO3a3a
O-M726VII1U29Eu16H7LO3d*O3cO3a3bO3a3bO3a4O3a4O3a3bO3a3bO3a3bO3a2bO3a2b
O-M11326VII1U29Eu16H7LO3d1O3c1O3a3b1O3a3b1-O3a4aO3a3b1O3a3b1O3a3b1O3a2b1O3a2b1
O-M13426VII1U30Eu16H8LO3e*O3dO3a3cO3a3cO3a5O3a5O3a3cO3a3cO3a3cO3a2c1O3a2c1
O-M11726VII1U30Eu16H8LO3e1*O3d1O3a3c1O3a3c1O3a5aO3a5aO3a3c1O3a3c1O3a3c1O3a2c1aO3a2c1a
O-M16226VII1U30Eu16H8LO3e1aO3d1aO3a3c1aO3a3c1aO3a5a1O3a5a1O3a3c1aO3a3c1aO3a3c1aO3a2c1a1O3a2c1a1

Original Research Publications

The following research teams per their publications were represented in the creation of the YCC Tree.

Phylogenetic Trees

This phylogenetic tree of haplogroup O subclades is based on the YCC 2008 tree and subsequent published research.

Y-DNA O Subclades

Y-DNA Backbone Tree

Footnotes

Works Cited

Journals
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