Haplogroup IJ (Y-DNA)

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Haplogroup IJ
Time of origin
Place of origin	Middle East
Ancestor	F
Descendants	I, J
Defining mutations	M429, P123, P124, P125, P126, P127, P129, P130, S2, S22

In human genetics, Haplogroup IJ is a human Y-chromosome DNA haplogroup. Haplogroup IJ is a descendant branch of the greater Haplogroup F.

[edit] Origin

It is notable that no example of a Haplogroup IJ* Y-chromosome has been found among any modern human population; the existence of the Haplogroup IJ node has been inferred from the fact that certain mutations are shared in common among all Y-chromosomes belonging to the descendant haplogroups I and J. The lack of any examples of Haplogroup IJ* belonging to neither Haplogroup I nor Haplogroup J complicates any attempt to deduce the geographical location where Haplogroup IJ first appeared; however, the fact that both Haplogroup I and Haplogroup J are found among modern populations of the Caucasus, Anatolia, and Southwest Asia tends to support the hypothesis that Haplogroup IJ derived from Haplogroup F in the vicinity of West Asia or the Middle East and subsequently spread throughout Western Eurasia.

The TMRCA (time to most recent common ancestor) for the IJ clade, expressed in ky (confidence interval), is 38.5 (30.5-46.2)^[1].