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More info on Haplogroup E1b1a (Y-DNA)

Haplogroup E1b1a (Y-DNA): Wikis

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Haplogroup E1b1a or E-M2
Time of origin approx 20,000-30,000 years BP[1]
Place of origin West Africa[1]
Ancestor E1b1
Descendants E1b1a1, E1b1a2, E1b1a3, E1b1a4, E1b1a5, E1b1a6, E1b1a7, E1b1a8, E1b1a9
Defining mutations DYS271/M2/SY81, M180/P88, P1/PN1, P46, P182, P189, P211, P293

In human genetics, Haplogroup E1b1a (M2) is a Y-chromosome haplogroup. From 2002 to 2008, it was known as Haplogroup E3a.

It can also be referred to with mutational nomenclature as E-M2.

It is sometime associated with Haplotype IV from Ngo and Lucotte nomenclature however it is not proved and the clues are weak.

Contents

Origin

Phylogenetic relationship of E1b1a with other haplogroup E clades.

Haplogroup E1b1a is the main haplogroup in sub-Saharan Africa, where it reaches frequencies of over 80% in West Africa.[2] It has been hypothesized that E1b1a originated in Northern Africa and then spread to sub-Saharan Africa with the Bantu expansion [3]. However, Rosa et al. (2007) and others suggest that it likely originated in and expanded from West Africa (i.e., the Sudanese Belt) within the last 20,000 to 30,000 years based on the fact that the frequency and diversity of E1b1a in this region are among the highest found.[1][4][5] E-M2 is considered to be the signature Y-DNA for the Bantu expansion, however, it should be considered the signature y-DNA for the Niger-Congo phylum or language, which means that E1b1a was probably the most common chromosome in West Africa when the Niger-Congo language emerged at least 15,000 YBP(years before present).[4][6]

Distribution

There exists a west-to-east as well as a south-to-north clinal distribution with respect to E1b1a, in other words, the diversity and frequency increases as you move from East and North Africa to West and Southern Africa.[7] . This is why it is observed in low frequencies in the Horn of Africa, North Africa, and Southwest Asia, where the E1b1b haplogroup has its highest frequencies, and its small presence in those areas is generally attributed to the slave trade and/or the Bantu expansion.[7][8]

Subclades of E1b1a

E1b1a is the single most common Y-chromosome haplogroup among people of Sub-Saharan African descent both inside and outside of Africa. It is observed at frequencies of 58%-60% in African Americans.[2] The E1b1a subclades E1b1a7 and E1b1a8 are widely found throughout sub-saharan Africans. However, according to Karafet, E1b1a9 has been found only in one Gambian. The haplogroups E1b1a2, E1b1a3, E1b1a4, E1b1a5, and E1b1a6 are quite uncommon as well.[9]

Tree

This phylogenetic tree of haplogroup subclades is based on the YCC 2008 tree [10] and subsequent published research.

  • E1b1a (M2, P1, M180 [P88], P46, P182, P189, P211, P293)
    • E1b1a1 (M58)
    • E1b1a2 (M116.2)
    • E1b1a3 (M149)
    • E1b1a4 (M154)
    • E1b1a5 (M155)
    • E1b1a6 (M10, M66, M156, M195)
    • E1b1a7 (M191/P86, U186, P253/U247)
      • E1b1a7a (P252/U174)
        • E1b1a7a1 (P9.2)
        • E1b1a7a2 (P115)
        • E1b1a7a3 (P116)
          • E1b1a7a3a (P113)
    • E1b1a8 (U175)
      • E1b1a8a (U209, P277, P278)
        • E1b1a8a1 (U290)
          • E1b1a8a1a (U181)
        • E1b1a8a2 (P59)
    • E1b1a9 (P268, P269)

Human Y-chromosome DNA (Y-DNA) haplogroups (by ethnic groups · famous haplotypes)

most recent common Y-ancestor
|
A BT
|
B CT
|
CF DE
| |
C F D E
|
G H IJK
|
IJ K
| |
I J L MNOPS T
|
M NO P S
| |
N O Q R

See also

Notes

  1. ^ a b c Rosa et al. (2007), Y-chromosomal diversity in the population of Guinea-Bissau: a multiethnic perspective, BMC Evolutionary Biology (2007), 7:124 doi:10.1186/1471-2148-7-124
  2. ^ a b Sims et al. (2007), Sub-Populations Within the Major European and African Derived Haplogroups R1b3 and E3a Are Differentiated by Previously Phylogenetically Undefined Y-SNPs, HUMAN MUTATION Mutation in Brief #940 (2007) Online
  3. ^ http://www.isogg.org/tree/ISOGG_HapgrpE09.html Y-DNA Haplogroup E and its Subclades - 2009
  4. ^ a b http://www.familytreedna.com/pdf/AJHG_2004_v74_p1023-1034.pdf 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
  5. ^ https://genographic.nationalgeographic.com/genographic/atlas.html?card=my031, Genographic Project e3a-m2 map
  6. ^ http://www3.interscience.wiley.com/cgi-bin/fulltext/114209614/PDFSTART Niger-Congo Speaking Populations and the Formation of the Brazilian Gene Pool: mtDNA and Y-Chromosome Data
  7. ^ a b Luis, J.R.; D. J. Rowold (2004 March). "The Levant versus the Horn of Africa: Evidence for Bidirectional Corridors of Human Migrations". The American Society Of Human Genetics 74 (3). {{doi:10.1086/382286}}. http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B8JDD-4RBW515-R&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=0feab96dcec628d2f90d4e8df0239acb.  
  8. ^ Sanchez et al., High frequencies of Y chromosome lineages characterized by E3b1, DYS19-11, DYS392-12 in Somali males, Eu J of Hum Genet (2005) 13, 856–866
  9. ^ Karafet, T. et al.: 2008, May "New binary polymorphisms reshape and increase resolution of the human Y chromosomal haplogroup tree", "Genome Research" volume 18(5), page 834.
  10. ^ Karafet et al. 2008

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