Subclades
Note: The systematic subclade names have changed several times in recent years, and they are likely to change again, as new markers are discovered which clarify the sequential branching of the tree. The scheme below is taken from ISOGG, which updates (Ytree 2011) Karafet et al. (2008).
- I-M438 (L68 {rs35547782}, M438/P215/S31 {rs17307294}) Low frequency in Armenia, Georgia and Turkey.
- I-L460 (L460)
- I-P37.2 (P37.2)
- I-M26 (L158, L159.1/S169.1, M26) 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
- I-L160 (L160)
- I-M161 (M161) Very rare (1 in Puerto Rico)
- I-L247 (L247,L277.2)
- I-L160 (L160)
- I-M423 (L178, M423)
- I-L621 (Former I2a2a in the Y2010 tree) (L69.2, L621) low frequency in Great Britain (aka I2a Disles)
- I-L147.5 (L147.5) Typical of the Balkan Slavic-speaking populations, especially the populations of Bosnia and Herzegovina and Croatia; also found with high frequency in Moldavia and Romania and high haplotype diversity values, but lower overall frequency, among the populations of Slovakia and the Czech Republic (aka I2a Dinaric)
- I-P41.2 (P41.2/M359.2) Very rare (2 in Bosnia and Herzegovina, 1 in Turkey, 1 in England and 1 in Croatia)
- I-L147.5 (L147.5) Typical of the Balkan Slavic-speaking populations, especially the populations of Bosnia and Herzegovina and Croatia; also found with high frequency in Moldavia and Romania and high haplotype diversity values, but lower overall frequency, among the populations of Slovakia and the Czech Republic (aka I2a Dinaric)
- I-L161 (L161) low frequency in Ireland and Great Britain (aka I2a Isles)
- I-L621 (Former I2a2a in the Y2010 tree) (L69.2, L621) low frequency in Great Britain (aka I2a Disles)
- I-L233 (L233)
- I-M26 (L158, L159.1/S169.1, M26) 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
- I-P214 (L35/S150, L37/S153, L181, M436/P214/S33, P216/S30, P217/S23, P218/S32)
- I-M223 (L34/S151, L36/S152, L59, L368, M223, P219/S24, P220/S119, P221/S120, P222/U250/S118, P223/S117) Occurs at a moderate frequency among populations of Northwest Europe, with a peak frequency in the region of Lower Saxony in central Germany; offshoots appear in Romania, Moldova and Russia (especially around Vladimir, Ryazan, Nizhny Novgorod, and the Republic of Mordovia)
- I-M284 (M284) Generally limited to a low frequency in Great Britain
- I-L126 (L126/S165, L137/S166)
- I-L369 (L369)
- I-L126 (L126/S165, L137/S166)
- I-L701 (L701)
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- I-P78 (P78)
- I-L699 (L699/L703)
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- I-Z161 (Z161)
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- I-L801 (L801) L801 seems to be equivalent to Z76.
- I2a2a3a1 (P95)
- I-Z78 (Z78)
- I-L1198 (L1198)
- I-Z190 (Z190)
- I-L1198 (L1198)
- I-L623 (L623)
- I-L801 (L801) L801 seems to be equivalent to Z76.
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- I-M284 (M284) Generally limited to a low frequency in Great Britain
- I-L40(L38/S154, L39/S155, L40/S156, L65.1/S159.1, L272.3)
- I-M223 (L34/S151, L36/S152, L59, L368, M223, P219/S24, P220/S119, P221/S120, P222/U250/S118, P223/S117) Occurs at a moderate frequency among populations of Northwest Europe, with a peak frequency in the region of Lower Saxony in central Germany; offshoots appear in Romania, Moldova and Russia (especially around Vladimir, Ryazan, Nizhny Novgorod, and the Republic of Mordovia)
- I-P37.2 (P37.2)
- I-L415 (L415, L416, L417)
- I-L596 (L596/S292, L597/S333)
- I-L460 (L460)
Read more about this topic: Haplogroup I2 (Y-DNA)