Haplogroup IJ (Y-DNA)

Haplogroup IJ
Possible time of origin	approximately 44,400 years BP
Possible place of origin	West Asia, Aegean Region, Iran
Ancestor	IJK
Descendants	I, J
Defining mutations	M429/P125, P123, P124, P126, P127, P129, P130, S2, S22

Haplogroup IJ (M429/P125) is a human Y-chromosome DNA haplogroup, an immediate descendant of Haplogroup IJK (formerly known as Haplogroup F-L15). IJK is a branch of Haplogroup HIJK.

The immediate descendants of IJ are Haplogroup I (I1: The original paternal lineage of Nordic Europe, I2: The main paternal lineage of Mesolithic Europeans) and Haplogroup J (J1: The dominant Arabic paternal lineage, J2: The Greco-Anatolian paternal lineage). Its sole sibling is K (which includes most of the world's male population).

Haplogroup IJ derived populations account for a significant proportion of the pre-modern populations of Europe (esp. Scandinavia for I1 and the Dinaric Alps for I2), the Middle East (esp. Arabia/The Caucasus for J1 and The Levant/Mesopotamia for J2) and coastal North Africa. As a result of mass migrations during the modern era, they are now also significant in The Americas and Australasia.

While old estimates suggested that the most recent common ancestor of haplogroup IJ could have lived 30,500 years ago, the latest estimates suggest that he lived 42,400–46,400 years before present.

Both of the primary branches of haplogroup IJ – I-M170 and J-M304 – are found among modern populations of the Caucasus, Anatolia, and Southwest Asia. This tends to suggest that Haplogroup IJ branched from IJK in West Asia and/or the Middle East.

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