Haplogroup L3 (mtDNA)

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Haplogroup L3
Possible time of origin80,000–104,000 YBP[1] or 60,000–70,000 YBP[2]
Possible place of originEast Africa,[3] or Asia[4]
AncestorL3'4
DescendantsL3a, L3b'f, L3c'd, L3e'i'k'x, L3h, M, N
Defining mutations769, 1018, 16311[5]

Haplogroup L3 is a human mitochondrial DNA (mtDNA) haplogroup. The clade has played a pivotal role in the prehistory of the human species. It represents the most common parent maternal lineage of all people outside Africa, and for many individuals within the continent as well.[6][7]

Origin[edit]

Ancient dispersal of haplogroup L3, its descendant M and N lineages, and other mtDNA clades. Numbers represent thousand years before present.

Haplogroup L3's exact place of origin is uncertain. According to the Recent African origin of modern humans (Out-of-Africa) theory, the clade is believed to have arisen and dispersed from East Africa between 84,000 and 104,000 years ago.[1] An analysis of 369 complete African L3 sequences placed the maximal date of the clade's expansion at around 70,000 years ago. This virtually rules out a successful exit out of Africa before 74,000, the date of the Toba volcanic super-eruption in Sumatra.[2] The Time to Most Recent Common Ancestor for the L3 lineage has also recently been estimated to date to between 58,900 and 70,200 years ago, around the time of and associated with the Out-of-Africa expansion of the ancestors of non-African modern humans from Eastern Africa into Eurasia around 70,000 years ago, and also with a similar expansion within Africa around that time also from the East of the continent.[2]

An Asia center of origin and dispersal for haplogroup L3 has also been hypothesized based on the similar coalescence dates of L3 and its Eurasian-distributed M and N derivative clades (~71 kya), the distant location in Southeast Asia of the oldest subclades of M and N, and the comparable age of the paternal haplogroup DE. According to this hypothesis, after an initial Out-of-Africa migration of early anatomically modern humans around 125 kya, fully modern human L3-carrying females are thus proposed to have back-migrated from the maternal haplogroup's place of origin in Eurasia around 70 kya along with males bearing the paternal haplogroup E, which is also proposed to have originated in Eurasia. These new Eurasian lineages are then suggested to have largely replaced the old autochthonous male and female African lineages.[4]

Distribution[edit]

Projected spatial distribution of haplogroup L3 in Africa and the Arabian peninsula.

L3 is common in Northeast Africa and some other parts of East Africa,[8] in contrast to others parts of Africa where the haplogroups L1 and L2 represent around two thirds of mtDNA lineages.[9] L3 sublineages are also frequent in the Arabian peninsula.

L3 is subdivided into several clades, two of which spawned the macrohaplogroups M and N that are today carried by most people outside Africa.[9] There is at least one relatively deep non-M, non-N clade of L3 outside Africa, L3f1b6, which is found at a frequency of 1% in Asturias, Spain. It diverged from African L3 lineages at least 10,000 years ago.[10]

According to Maca-Meyer et al. (2001), "L3 is more related to Eurasian haplogroups than to the most divergent African clusters L1 and L2".[11] L3 is the haplogroup from which all modern humans outside Africa derive.[12] However, there are more branches of l3 within Africa than outside of it, the two distinct non-African branches being M and N.

Haplogroup L3 has been observed in an ancient fossil belonging to the Pre-Pottery Neolithic B culture.[13] L3x2a was observed in a 4,500 year old hunter-gather excavated in Mota, Ethiopia, with the ancient fossil found to be most closely related to the modern Ari foragers.[14][15] Haplogroup L3 has also been found among ancient Egyptian mummies excavated at the Abusir el-Meleq archaeological site in Middle Egypt, which date from the Pre-Ptolemaic/late New Kingdom and Ptolemaic periods.[16] Additionally, haplogroup L3 has been observed in ancient Guanche fossils excavated in Gran Canaria and Tenerife on the Canary Islands, which have been radiocarbon-dated to between the 7th and 11th centuries CE. All of the clade-bearing individuals were inhumed at the Gran Canaria site, with most of these specimens found to belong to the L3b1a subclade (3/4; 75%). The Guanche skeletons also bore an autochthonous Maghrebi genomic component that peaks among modern Berbers, which suggests that they originated from ancestral Berber populations inhabiting northwestern Affoundnat a high ncy[17]

Subclade distribution[edit]

L3 subclade distribution: L3b, L3d, L3e, L3f, L3h, L3i, L3x and L3w.
  • L3a – East Africa.[6][7] Moderate to high frequencies found among the Sanye, Samburu, Iraqw, Yaaku, El-Molo and other minor indigenous populations from the East African Rift Valley.[18]
  • L3b'f
    • L3b – Lineage originated in Central Africa. Subclades spread to East Africa with the Bantu migration.[7]
      • L3b1a – Common subclade. Estimated age of 11.7-14.8 ka.[7]
        • L3b1a2 – Subclade found in Northeast Africa, the Maghreb, and Middle East. Emerged 12-14 ka.[20][19]
    • L3f – Northeast Africa, Sahel, Arabian peninsula, Iberia. Gaalien,[21] Beja[21]
      • L3f1
        • L3f1a – Carried by migrants from Eastern Africa into the Sahel and Central Africa.[7]
        • L3f1b – Carried by migrants from Eastern Africa into the Sahel and Central Africa.[7]
          • L3f1b1 - Carried into South Africa with the Bantu migration.[7]
          • L3f1b4 - Carried into South Africa with the Bantu migration.[7]
        • L3f1b6 – Asturias, Spain.[10]
      • L3f2 – Primarily distributed in East Africa.[7] Also found in North Africa and Central Africa.[20]
      • L3f3 – Spread into Chad and the Sahel from Eastern Africa around 8-9 ka.[7] Found in the Chad Basin.[20][22]
  • L3c'd
  • L3e'i'k'x
    • L3e – West-Central Africa. It is the most common L3 sub-clade in Bantu-speaking populations.[26] L3e is suggested to be associated with a Central African origin and is also the most common L3 subclade amongst African Americans, Afro-Brazilians and Caribbeans[27]
    • L3i Almost exclusively found in East Africa.[7]
      • L3i1
        • L3i1b – Subclade is found in Yemen, Ethiopia, and among Gujarati Indians.[20]
      • L3i2 (former L3w) – Found in the Horn of Africa and Oman.[20]
    • L3k – Rare haplogroup primarily found in North Africa and the Sahel.[7][20]
    • L3x – Almost exclusively found in East Africa.[7] Found among Ethiopian Oromos,[23] Egyptians[Note 2][31]
  • L3h – Almost exclusively found in East Africa.[7]
    • L3h1 – Primarily found in East Africa with branches of L3h1b1 sporadically found in the Sahel and North Africa.[19][20]
    • L3h2 – Found in Northeast Africa and Socotra.[19][20]

Tree[edit]

This phylogenetic tree of haplogroup L3 subclades is based on the paper by Mannis van Oven and Manfred Kayser Updated comprehensive phylogenetic tree of global human mitochondrial DNA variation[5] and subsequent published research.[32]

Most Recent Common Ancestor (MRCA)

  • L1-6
    • L2-6
      • L2'3'4'6
        • L3'4'6
          • L3'4
            • L3
              • L3a
                • L3a1
                  • L3a1a
                  • L3a1b
                • L3a2
                  • L3a2a
              • L3b'f
                • L3b
                  • L3b1
                    • L3b1a
                      • L3b1a1
                      • L3b1a2
                      • L3b1a3
                      • L3b1a4
                      • L3b1a5
                        • L3b1a5a
                        • L3b1a6
                        • L3b1a7
                          • L3b1a7
                        • L3b1a8
                        • L3b1a9
                          • L3b1a9a
                      • L3b1a10
                      • L3b1a11
                    • L3b1b
                      • L3b1b1
                  • L3b2
                    • L3b2a
                    • L3b2a
                  • L3b3
                • L3f
                  • L3f1
                    • L3f1a
                      • L3f1a1
                    • L3f1b
                      • L3f1b1
                      • L3f1b2
                        • L3f1b2a
                        • L3f1b3
                        • L3f1b4
                          • L3f1b4a
                            • L3f1b4a1
                          • L3f1b4b
                          • L3f1b4c
                      • L3f1b5
                  • L3f2
                    • L3f2a
                    • L3f2b
                  • L3f3
                    • L3f3a
                    • L3f3b
              • L3c'd
                • L3c
                • L3d
                  • L3d1-5
                    • L3d1
                      • L3d1a
                        • L3d1a1
                          • L3d1a1a
                      • L3d1b
                        • L3d1b1
                      • L3d1c
                      • L3d1d
                    • 199
                      • L3d2
                      • L3d5
                    • L3d3
                      • L3d3a
                    • L3d4
                    • L3d5
              • L3e'i'k'x
                • L3e
                  • L3e1
                    • L3e1a
                      • L3e1a1
                        • L3e1a1a
                      • 152
                        • L3e1a2
                        • L3e1a3
                    • L3e1b
                    • L3e1c
                    • L3e1d
                    • L3e1e
                  • L3e2
                    • L3e2a
                      • L3e2a1
                        • L3e2a1a
                        • L3e2a1b
                          • L3e2a1b1
                    • L3e2b
                      • L3e2b1
                        • L3e2b1a
                      • L3e2b2
                      • L3e2b3
                  • L3e3'4'5
                    • L3e3'4
                      • L3e3
                        • L3e3a
                        • L3e3b
                          • L3e3b1
                        • L3e4
                    • L3e5
                • L3i
                  • L3i1
                    • L3i1a
                    • L3i1b
                  • L3i2
                • L3k
                  • L3k1
                • L3x
                  • L3x1
                    • L3x1a
                      • L3x1a1
                      • L3x1a2
                    • L3x1b
                  • L3x2
                    • L3x2a
                      • L3x2a1
                        • L3x2a1a
                    • L3x2b
              • L3h
                • L3h1
                  • L3h1a
                    • L3h1a1
                    • L3h1a2
                      • L3h1a2a
                      • L3h1a2b
                  • L3h1b
                    • L3h1b1
                      • L3h1b1a
                        • L3h1b1a1
                    • L3h1b2
                • L3h2
              • M
              • N

See also[edit]

Phylogenetic tree of human mitochondrial DNA (mtDNA) haplogroups

  Mitochondrial Eve (L)    
L0 L1–6  
L1 L2   L3     L4 L5 L6
M N  
CZ D E G Q   O A S R   I W X Y
C Z B F R0   pre-JT   P   U
HV JT K
H V J T

References[edit]

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Notes[edit]

  1. ^ See Supplemental_TreeUpdatedOctober.xls found under the Supplementary data of Soares et al. 2011
  2. ^ GUR46 on table 1. is a mtDNA haplogroup L3x2a.

External links[edit]