Haplogroup E (Y-DNA)

Infobox haplogroup
name = E or E-M96
origin-place = East Africa or Near East [ [http://www.isogg.org/tree/ISOGG_HapgrpE08.html Y-DNA Haplogroup E and its Subclades - 2008] ]
origin-date = approx. 52,500 years BP [*Karafet et al. (2008), [http://www.genome.org/cgi/content/abstract/gr.7172008v1 Abstract New Binary Polymorphisms Reshape and Increase Resolution of the Human Y-Chromosomal Haplogroup Tree] , Genome Research, DOI: 10.1101/gr.7172008]
ancestor = DE
descendants = E1, E2
mutations = M96

In human genetics, Haplogroup E (M96) is a human Y-chromosome DNA haplogroup.

This clade is divided into two sub-clades: E1 (or E-P147), defined by SNP mutation P147, and E2 (or E-M75), defined by M75.

E1 is in turn divided in important sub-clades as follows:::*E1a (formerly E1), defined by mutations M33 and M132. Two sub-clades are recognized::::*E1a1 (or E-M44, formerly E1a):::*E1a2 (or E-P110)::*E1b, defined by mutation P177. This in turn contains two very significant sub-clades: :::*E1b1 (formerly E3). E1b1 is further divided into two sub-clades ::::*E1b1a (formerly E3a)::::*E1b1b (formerly E3b):::*E1b2 (formerly E4)

E2 is less commonly found, and has two recognized sub-clades:::*E2a M41/P210::*E2b M54, M90, M98. This clade contains E2b1 (E-M85), formerly known as E2b2, and its sub-clades.

E1a and E2 are found almost exclusively in Africa, and only E1b1b is observed in significant frequencies in Europe and western Asia in addition to Africa. Most Sub-Saharan Africans belong to subclades of E other than E1b1b, while most non-Africans who belong to haplogroup E belong to its E1b1b subclade. [Fulvio Cruciani et al, Phylogeographic Analysis of Haplogroup E1b1b (E-M215) Y Chromosomes Reveals Multiple Migratory Events Within and Out Of Africa, Am. J. Hum. Genet, p. 74]

Haplogroup E would appear to have arisen in Northeast Africa based on the concentration and variety of E subclades in that area today. But the fact that Haplogroup E is closely linked with Haplogroup D, which is not found in Africa, leaves open the possibility that E first arose in the Near or Middle East and was subsequently carried into Africa by a back migration [ [http://www.isogg.org/tree/ISOGG_HapgrpE08.html Y-DNA Haplogroup E and its Subclades - 2008] ] . Indeed, geneticist Stephen Oppenheimer theorizes that early humans first (successfully) left Africa across the mouth of the Red Sea, between Ethiopia and Yemen [ [http://www.bradshawfoundation.com/stephenoppenheimer/] ] . This further suggests that, if haplogroup DE first crossed over to Yemen, D carried on to southeast Asia, while E stayed back in, or near, Arabia.

ubclades

Subclades of Haplogroup E include E1a, E2, E1b1a (M2) and E1b1b (M35).

E1a

E1a (M33) headed for West Africa and today it is mainly present in the region of Mali. One study has found haplogroup E1a-M33 Y-chromosomes in as much as 34% (15/44) of a sample of Malian men. Haplogroup E1a has also been detected among samples obtained from Moroccan Berbers, Sahrawis, Burkina Faso, northern Cameroon, Senegal, Sudan, Egypt, and Calabria (including both Italian and Albanian inhabitants of the region).Ornella Semino, Chiara Magri, Giorgia Benuzzi, Alice A. Lin, Nadia Al-Zahery, Vincenza Battaglia, Liliana Maccioni, Costas Triantaphyllidis, Peidong Shen, Peter J. Oefner, Lev A. Zhivotovsky, Roy King, Antonio Torroni, L. Luca Cavalli-Sforza, Peter A. Underhill, and A. Silvana Santachiara-Benerecetti, "Origin, Diffusion, and Differentiation of Y-Chromosome Haplogroups E and J: Inferences on the Neolithization of Europe and Later Migratory Events in the Mediterranean Area," "American Journal of Human Genetics" 74:1023–1034, 2004.] J. R. Luis, D. J. Rowold, M. Regueiro, B. Caeiro, C. Cinnioğlu, C. Roseman, P. A. Underhill, L. L. Cavalli-Sforza, and R. J. Herrera, "The Levant versus the Horn of Africa: Evidence for Bidirectional Corridors of Human Migrations," "American Journal of Human Genetics" 74:532-544, 2004.]

The small presence (<4%) of Haplogroup E1a in North Africa and Europe is generally attributed to the slave trade, as it is characteristic of West African populations.

E1b

E1b1, a sub-clade of E1b, is by far the most frequent clade of E, diverged into two main haplogroups: E1b1b (M35) approximately 24-27 000 years ago (Cruciani "et al." 2004), followed by E1b1a (M2) some 10,000 years later. Major sub-clades...

E1b1a

E1b1a is almost exclusively associated with West/Central/South/Southeastern Africans. It is the single most common Y haplogroup in sub-Saharan Africa as well as among African Americans and West Indians. Outside of Africa, it is observed in negligibly small frequencies and its spread is generally attributed to the slave trade.

E1b1b

E1b1b, which is at once the most common Y haplogroup among Ethiopians, Somalis, Eritreans and North African Berbers and Arabs, is the third most common haplogroup in Europe. [ [http://www.dnaheritage.com/surnameform.asp?GroupUnique=847878844&Surname=Britton The Britton Surname Project at DNA Heritage] ] It is also common in the Near East, from where it spread into the Balkans and the rest of Europe. E1b1b has three common subclades: M78, M81, and M34.

E1b1b1a (E-M78)

M78 is found throughout North Africa and the Horn of Africa, as well as the Near East and Europe. Its network shows high geographic structuring. The α cluster is particular to Europe, where it is highest in the Balkans. It enjoys frequencies of about 23.8% among Greeks with a frequency of about 47% in the Peloponnese region of Greece, [http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1181965 Semino et al. (2004), Origin, Diffusion, and Differentiation of Y-Chromosome Haplogroups E and J: Inferences on the Neolithization of Europe and Later Migratory Events in the Mediterranean Area] ] about 25% among Albanians at large with a frequency of 46% among Albanians in Kosovo [ [http://mbe.oxfordjournals.org/cgi/content/full/22/10/1964 Peričic et al. (2005), High-Resolution Phylogenetic Analysis of Southeastern Europe Traces Major Episodes of Paternal Gene Flow Among Slavic Populations] ] , and frequencies of about 20% in some South Slavic populations (Serbs, Macedonians, Bulgarians) [Perici] . Among Jews both in Europe and the Middle East, E1b1b is the second most common Y haplogroup after J. [ [http://www.familytreedna.com/public/JewishE3bProject Jewish E1b1b (E3b) Project at FTDNA] ] A β and a γ cluster are particular to North and Northeast Africa, respectively. A fourth, δ, cluster is found in all regions albeit at low frequencies. Cruciani suggests that it was the δ cluster that spread M78 throughout North and Northeast Africa, the Near East and later Europe, c. 14 KYA. It was only during later population expansions bearing the α, β and γ clusters (which diverged from the δ cluster) that led to E1b1b's current high frequency.

In Northeast Africa, the subclade M34 appears to be restricted to Ethiopia. However, M34 chromosomes have been found in a large majority of the populations from the Near East. M34 chromosomes from Ethiopia show lower variances than those from the Near East and appear closely related in the M34 network. Thus, it is assumed that M34 chromosomes were introduced into Ethiopia from the Near East. [Cruciani, 2004]

E1b1b1b (E-M81)

M81, the other major subclade of E1b1b, is heavily concentrated in North Africa among both the Berber and Arab populations of that region. M81 is also found, albeit at low frequencies of 1.6-4%, in Iberia. Cruciani attributes its presence in Iberia to a recent migration of M81 carrying peoples from the Maghreb, perhaps coinciding with the Islamic conquest of Spain.

Scholars such as Hammer et al. and Semino et al. have linked the spread of E1b1b into Europe to an ancient migration from East Africa mediated through North African and Middle Eastern farmers during the Neolithic period. However, given the predominance of α cluster of subclade M78 in Europe, Cruciani concluded that it was spread through Europe via peoples indigenous to Southeastern Europe, perhaps in response to the arrival of Neolithic farming by way of cultural contact with the Near East. In turn, it originally arrived into Europe, perhaps, directly from North or Northeast Africa. Thus, its distribution is not simply due to a process of uniform spread of people from a single Near Eastern origin, but rather a series of distinct migrations.

E2

E2 (M75) is present among sub-Saharan Africans in both West and East Africa. The highest concentration of haplogroup E2 has been found among South African and Kenyan Bantus, with moderate frequencies of this haplogroup being observed in samples from Burkina Faso, Hutu and Tutsi from Rwanda, Fon from Benin, Iraqw from Tanzania, [Called "Wairak" and misidentified as Bantu in Luis "et al." (2004).] unidentified South African Khoisan, Sudan, northern Cameroon, and Senegal, as well as small frequencies in the Qatar, Oman, and Ethiopian Oromo samples.

The minor presence of Haplogroup E2 in the Omani and Qatari (<5%) as well as the Oromo (<2%) samples is attributable to the slave trade and the Bantu Expansion, as it is characteristic of West, Central, Southern, and Southeastern African populations. [Sanchez et al. (2005). "High frequencies of Y chromosome lineages characterized by E3b1, DYS19-11, DYS392-12 in Somali males". European Journal of Human Genetics; 13:856–866]

Notes

References

*B. Arredi "et al.": A Predominantly Neolithic Origin for Y-Chromosomal DNA Variation in North Africa. American Journal Of Human Genetics, 2004, p. 338–345
*F. Cruciani "et al.": A Back Migration from Asia to Sub-Saharan Africa Is Supported by High-Resolution Analysis of Human Y-Chromosome Haplotypes. American Journal Of Human Genetics, 2002, p. 1197–1214
*F. Cruciani "et al.": Phylogeographic Analysis of Haplogroup E3b (E-M215) Y Chromosomes Reveals Multiple Migratory Events Within and Out Of Africa. American Journal Of Human Genetics, 2004, p. 1014–1022
*F. Cruciani "et al.": [http://www3.interscience.wiley.com/homepages/38515/pdf/916.pdf Molecular Dissection of the Y Chromosome Haplogroup M-78]
*J. R. Luis "et al.": [http://hpgl.stanford.edu/publications/AJHG_2004_v74_p000-0130.pdf The Levant versus the Horn of Africa: Evidence for Bidirectional Corridors of Human Migrations.] ( [http://hpgl.stanford.edu/publications/AJHG_2004_v74_errata.pdf Errata] ) American Journal Of Human Genetics, 2004, p. 523-544
*J. J. Sanchez "et al.": High frequencies of Y chromosome lineages characterized by E3b1, DYS19-11, DYS392-12 in Somali males. European Journal of Human Genetics, 2005, p. 856–86
*A. Salas "et al.": The Making of the African mtDNA Landscape. American Journal Of Human Genetics, 2002, p. 1082–1111
*O. Semino "et al.": Origin, Diffusion, and Differentiation of Y-Chromosome Haplogroups E and J: Inferences on the Neolithization of Europe and Later Migratory Events in the Mediterranean Area. American Journal of Human Genetics, 2004, p. 1023-1034
*E. T. Wood "et al.": Contrasting patterns of Y chromosome and mtDNA variation in Africa: evidence for sex-biased demographic processes. European Journal of Human Genetics, 2005, p. 867–876
*F. Cruciani "et al.": Tracing Past Human Male Movements in Northern/Eastern Africa and Western Eurasia: New Clues from Y-chromosomal Haplogroups E-M78 and J-M12, 2007.

External links

* [http://www.familytreedna.com/public/india The India Genealogical Project]
* [http://www.familytreedna.com/public/scandinavianydna The Scandinavian yDNA Genealogical Project]
* [http://mbe.oxfordjournals.org/content/vol22/issue10/images/large/molbiolevolmsi185f04_ht.jpeg Map of E1b1b1 distribution in Europe]

Projects

* [http://www.familytreedna.com/public/e3b E1b1b (E3b) Y-DNA Project at FTDNA]
* [http://www.haplozone.net/e3b/project Haplozone::The E-M35 Phylogeny Project (former E3b Project)]
* [http://www.familytreedna.com/public/JewishE3bProject Jewish E1b1b (E3b) Project at FTDNA]