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].
Subclades
IJ (M429, P123, P124, P125, P126, P127, P129, P130, S2, S22) per ISOGG 2008
I (M170, P19, M258, P38, P212, U179) Haplogroup I notation updated to ISOGG 2008
I*
I1 (M253, M307, M450/S109, P30, P40, S62, S63, S64, S65, S66, S107, S108, S110, S111) (formerly I1a) Typical of populations of Scandinavia and Northwest Europe, with a moderate distribution throughout Eastern Europe
I1*
I1a (M21) (formerly I1a2)
I1b (M227) (formerly I1a1) Appears to be limited to a marginally low frequency of approximately 1% among Slavic and Uralic peoples of Eastern Europe; also detected in a single Lebanese man
I2a (P37.2) (formerly I1b1) Typical of the South Slavic peoples of the Balkans, especially the populations of Bosnia and Croatia; also found with high haplotype diversity values, but lower overall frequency, among the West Slavic populations of Slovakia and the Czech Republic; a node of elevated frequency in Moldavia correlates with that observed for Haplogroup I2a (but not for Haplogroup I1)
I2a*
I2a1 (M423)
I2a1*
I2a1a (P41.2/M359.2) (formerly I1b1a) Typical of the population of the so-called "archaic zone" of Sardinia; also found at low frequencies among populations of Southwest Europe, particularly in Castile, Béarn, and the Basque Country
I2b1 (M223, P219/S24, P220/S119, P221/S120, P222/U250/S118, P223/S117) (formerly I1b2a - old I1c) Occurs at a moderate frequency among populations of Northwest Europe, with a peak frequency in the region of Lower Saxony in central Germany; minor offshoots appear in Moldavia and Russia (especially around Vladimir, Ryazan, Nizhny Novgorod, and the Republic of Mordovia)
I2b1*
I2b1a (M284) (formerly I1b2a1) Generally limited to a low frequency in Great Britain
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