Haplogroup U (mtDNA)

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Haplogroup U
Possible time of origin55,000 BP
Possible place of origin
AncestorR
DescendantsU1, U5, U6, U2'3'4'7'8'9
Defining mutations11467, 12308, 12372[1]
 
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Haplogroup U
Possible time of origin55,000 BP
Possible place of origin
AncestorR
DescendantsU1, U5, U6, U2'3'4'7'8'9
Defining mutations11467, 12308, 12372[1]

In human mitochondrial genetics, Haplogroup U is a human mitochondrial DNA (mtDNA) haplogroup. U subgroups are widely distributed across Western Eurasia, North Africa, and South Asia.

Origins[edit]

Haplogroup U descends from a woman in the Haplogroup R (mtDNA) branch of the phylogenetic tree, who lived around 55,000 years ago.[2]

Distribution[edit]

Haplogroup U is found in 15% of Indian caste and 8% of Indian tribal populations.[2] Haplogroup U is found in approximately 11% of native Europeans and is held as the oldest maternal haplogroup found in that region.[2][3][4] In a 2013 study, all but one of the ancient modern human sequences from Europe belonged to maternal haplogroup U, thus confirming previous findings that haplogroup U was the dominant type of Mitochondrial DNA (mtDNA) in Europe before the spread of agriculture into Europe.[5]

Haplogroup U is subdivided into Haplogroups U1-U9. Haplogroup K is a subclade of U8.[6] The old age has led to a wide distribution of the descendant subgroups across Western Eurasia, North Africa, and South Asia. Some subclades of U have a more specific geographic range.

Subclades[edit]

Haplogroup U1[edit]

Haplogroup U1 is found at very low frequency throughout Europe. It is found more often in eastern Europe, Anatolia and the Near East. It is also found at low frequencies in India. Haplogroup U1 is a very ancient haplogroup, with an estimated age of about 32,000 years. U1 is found in the Svanetia region at 4.2%. Subclade U1a is found from India to Europe, but is extremely rare among the northern and Atlantic fringes of Europe including the British Isles and Scandinavia. Several examples in Tuscany have been noted. In India, U1a has been found in the Kerala region. U1b has a similar spread but is rarer than U1a. Some examples of U1b have been found among Jewish diaspora. Subclades U1a and U1b appear in equal frequency in eastern Europe.[7]

The U1 subclades are: U1a (with deep-subclades U1a1, U1a1a, U1a1a1, U1a1b)[8] and U1b.[8]

DNA analysis of excavated remains now located at St. Augustine convent in Goa, India revealed the unique mtDNA subclade U1b, which is absent in India, but present in Georgia and surrounding regions.[9] Since the genetic analysis corroborates archaeological and literary evidence, it is believed that the excavated remains belong to Queen Ketevan of Georgia.[9]

Haplogroup U2[edit]

Haplogroup U2 is most common in South Asia[10] but is also found in low frequency in Central and West Asia, as well as in Europe as U2e (the Western Eurasian variety of U2 is named U2e).[11] The overall frequency of U2 in South Asia is largely accounted for by the group U2i in India whereas haplogroup U2e, common in Europe, is entirely absent; given that these lineages diverged approximately 50,000-years-ago, these data have been interpreted as indicating very low maternal-line gene-flow between South Asia and Europe throughout this period.[10] Approximately one half of the U mtDNAs in India belong to the Indian-specific branches of haplogroup U2 (U2i: U2a, U2b and U2c).[10] While U2 is typically found in India, it is also present in the Nogais peoples, descendants of various Mongolic and Turkic tribes, who formed the Nogai Horde.[12] Both U2 and U4 are found in the Kets and Nganasans, the indigenous inhabitants of the Yenisey River Basin and the Taimyr Peninsula.[13]

The U2 subclades are: U2a,[14] U2b,[15] U2c,[16] U2d,[17] and U2e.[18] With the India-specific subclades U2a, U2b, and U2c collectively referred to as U2i, the Eurasian haplogroup U2d appears to be a sister clade with the Indian haplogroup U2c,[19] while U2e is considered a Western Eurasian-specific subclade.[11]

Haplogroup U2 has been found in the remains of a 30,000-year-old hunter-gatherer from the Kostyonki, Voronezh Oblast in Central-South European Russia.,[20] in 4,800 to 4,000-year-old human remains from a Late Neolithic Bell-Beaker site in Kromsdorf Germany,[21] and in 2,000-year-old human remains from Bøgebjerggård in Southern Denmark. However, haplogroup U2 is rare in present day Scandinavians.[22] The remains of a 2,000-year-old West Eurasian male of haplogroup U2e1 was found in the Xiongnu Cemetery of Northeast Mongolia.[23]

Haplogroup U3[edit]

Haplogroup U3 is defined by the HVR1 transition A16343G. It is found at low levels throughout Europe (about 1% of the population), the Near East (about 2.5% of the population), and Central Asia (about 1% of the population). U3 is present in the Svan population from the Svaneti region (about 4.2% of the population) and among Lithuanian Romani, Polish Romani, and Spanish Romani populations (36-56%).[24][25][26]

The U3 subclades are: U3a[27] and U3b.[27]

Haplogroup U3 has been found in 6400-year-old remains (U3a) discovered in the caves at Wadi El‐Makkukh near Jericho associated with the Chalcolithic period.[28] Haplogroup U3 was already present in the West Eurasian gene pool around 6,000-years-ago and probably also its subclade U3a as well.[28]

Haplogroup U4[edit]

Haplogroup U4 has its origin in the Upper Palaeolithic, dating to approximately 25,000 years ago and has been implicated in the expansion of modern humans into Europe occurring before the Last Glacial Maximum.[29] U4 is an ancient mitochondrial haplogroup[30] and is relatively rare in modern populations.[31] U4 is found in Europe with highest concentrations in Scandinavia and the Baltic states[32] and is associated with the remnants of ancient European hunting-gatherers preserved in the indigenous populations of Siberia.[33][34][35] U4 is found in Nganasans the indigenous inhabitants of the Taimyr Peninsula,[13][36] in the Mansi (16.3%) an endangered people,[35] and in the Ket people (28.9%) of the Yenisey River.[35] U4 is also preserved in the Kalash people a unique tribe among the Indo-Aryan peoples of Pakistan where it attains its highest frequency of 34%.[37][38]

The U4 subclades are: U4a.[39] U4b,[40] U4c,[41] and U4d.[42]

Bryan Sykes provided this popular description for haplogroup U4: "The clan of Ulrike (German for Mistress of All) is not among the original 'Seven Daughters of Eve' clans, but with just under 2% of Europeans among its members, it has a claim to being included among the numerically important clans. Ulrike lived about 18,000 years ago in the cold refuges of the Ukraine at the northern limits of human habitation. Though Ulrike's descendants are nowhere common, the clan is found today mainly in the east and north of Europe with particularly high concentrations in Scandinavia and the Baltic states."[43]

Haplogroup U4 is associated with ancient European hunter-gatherers and has been found in 7,200 to 6,000-year-old remains of the Pitted Ware culture in Gotland Sweden and in 4,400 to 3,800-year-old remains from the Damsbo site of the Danish Bell-Beaker culture.[44][45][46] Remains identified as subclade U4a2 are associated with the Battle Axe culture which flourished 5,200 to 4,300 years ago in eastern and central Europe and encompassed most of continental northern Europe from the Volga River in the east to the Rhine River in the west.[47] Mitochondrial DNA recovered from 3,500 to 3,300-year-old remains at the Bredtoftegård site in Denmark associated with the Nordic Bronze Age include haplogroup U4 with 16179T in its HVR1 indicative of subclade U4c1.[46][48][49][50]

Haplogroup U5[edit]

The age of U5 is estimated at 30-50,000 years.[51] Approximately 11% of total Europeans and 10% of European-Americans are in haplogroup U5. In 'The Seven Daughters of Eve', this haplogroup, as well as Haplogroup U in general, is labelled 'Clan Ursula'. Haplogroup U5 is believed to be the oldest single branch of Haplogroup U, hence the sharing of the 'Ursula' designation by both groups. Because of that, it is widely believed that it was this branch who then interbred with another ancient European race, the Neanderthals themselves.

U5 has been found in human remains dating from the Mesolithic in England, Germany, Lithuania, Poland, Portugal, Russia,[52] Sweden,[53] France [54] and Spain. [55] Haplogroup U5 and its subclades U5a and U5b form the highest population concentrations in the far north, in Sami, Finns, and Estonians, but it is spread widely at lower levels throughout Europe. This distribution, and the age of the haplogroup, indicate individuals from this haplogroup were part of the initial expansion tracking the retreat of ice sheets from Europe around 10.000 years ago.

Haplogroup U5 is found also in small frequencies and at much lower diversity in the Near East and parts of northern Africa (areas with sizable U6 concentrations), suggesting back-migration of people from Europe to the south.[56]

Mitochondrial haplogroup U5a has also been associated with HIV infected individuals displaying accelerated progression to AIDS and death.[57]

Haplogroup U6[edit]

Haplogroup U6 was named 'Ulla' by Bryan Sykes. It is common (around 10% of the people) [56] in North Africa (with a maximum of 29% in an Algerian Mozabites[62]) and the Canary Islands (18% on average with a peak frequency of 50.1% in La Gomera). It is also found in the Iberian peninsula, where it has the highest diversity (10 out of 19 sublineages are only found in this region and not in Africa),[63] Eastern Africa and occasionally in other locations.

U6 is thought to have entered North Africa around 30,000 years ago from the Near-East. In spite of the highest diversity of Iberian U6, Maca-Meyer argues for an Near East origin of this clade based on the highest diversity of subclade U6a in that region,[63] where it would have arrived from West Asia. She estimates the age of U6 between 25,000 and 66,000 years BP. However U6 has its highest frequencies in North Africa and seems to be a specific haplogroup of that region.

U6 has three main subclades:[63]

Subgroup U6a reflects the first African expansion from the Maghrib returning to the east. Derivative clade U6a1 signals a posterior movement from East Africa back to the Maghrib and the Near East. This migration coincides with the probable Afroasiatic linguistic expansion. U6b and U6c clades, restricted to West Africa, had more localized expansions. U6b probably reached the Iberian Peninsula during the Capsian diffusion in North Africa. Two autochthonous derivatives of these clades (U6b1 and U6c1) indicate the arrival of North African settlers to the Canarian Archipelago in prehistoric times, most probably due to the Saharan desiccation. The absence of these Canarian lineages nowadays in Africa suggests important demographic movements in the western area of this Continent.

—Maca-Meyer 2003

U6a and U6b share a common basal mutation (16219) that is not present in U6c.

Haplogroup U7[edit]

Haplogroup U7 is considered a West Eurasian-specific mtDNA haplogroup, believed to have originated in the Black Sea area approximately 30,000-years-ago.[64][65][66] In modern populations, U7 occurs at low frequency in the Caucasus,[67] the western Siberian tribes,[68] West Asia (about 4% in the Near East, 5% in Pakistan, and 10% in Iranians),[69] South Asia (about 12% in Gujarat, the westernmost state of India, while for the whole of India its frequency stays around 2%),[70] and the Vedda people of Sri Lanka where it reaches it highest frequency of 13.33% (subclade U7a).[71] One third of the West Eurasian-specific mtDNAs found in India are in haplogroups U7, R2 and W. It is speculated that large-scale immigration carried these mitochondrial haplogroups into India.[72]

The U7 subclades are: U7a (with deep-subclades U7a1, U7a2, U7a2a, U7a2b)[73] and U7b.[73]

Genetic analysis of individuals associated with the Late Hallstatt culture from Baden-Württemberg Germany considered to be examples of Iron Age “princely burials” included haplogroup U7.[74] Haplogroup U7 was reported to have been found in 1200-year-old human remains (dating to around AD 834), in a woman believed to be from a Royal Clan, who was buried with the Viking Oseberg ship in Norway.[75] Haplogroup U7 was found in 1000-year-old human remains (dating to around AD 1000-1250) in a Christian cemetery is Kongemarken Denmark. However, U7 is rare among present-day ethnic Scandinavians.[76]

Haplogroup U8[edit]

Haplogroup K[edit]

See main article Haplogroup K (mtDNA). Haplogroup K makes up a sizeable fraction of European and West Asian mtDNA lineages. It is now known it is actually a subclade of haplogroup U8b'K,[6] and is believed to have first arisen in northeastern Italy. Haplogroup UK shows some evidence of being highly protective against AIDS progression.[57]

Haplogroup U9[edit]

Haplogroup U9 is a rare clade in mtDNA phylogeny, characterized only recently in a few populations of Pakistan (Quintana-Murci et al. 2004). Its presence in Ethiopia and Yemen, together with some Indian-specific M lineages in the Yemeni sample, points to gene flow along the coast of the Arabian Sea. Haplogroups U9 and U4 share two common mutations at the root of their phylogeny. It is interesting that, in Pakistan, U9 occurs frequently only among the so-called “negroid Makrani” population. In this particular population, lineages specific to sub-Saharan Africans occur as frequently as 39%, which suggests that U9 lineages in Pakistan may have an African origin (Quintana-Murci et al. 2004). Regardless of which coast of the Arabian Sea may have been the origin of U9, its Ethiopian–southern Arabian–Indus Basin distribution hints that its diversification from U4 may have occurred in regions far away from the current area of the highest diversity and frequency of haplogroup U4—East Europe and western Siberia.[77]

Tree[edit]

This phylogenetic tree of haplogroup U subclades is based on the paper by Mannis van Oven and Manfred Kayser Updated comprehensive phylogenetic tree of global human mitochondrial DNA variation[1] and subsequent published research.

See also[edit]

Evolutionary tree of human mitochondrial DNA (mtDNA) haplogroups

 Mitochondrial Eve (L)  
L0L1–6
L1L2L3 L4L5L6
 MN 
CZDEGQ AS R IWXY
CZBFR0 pre-JTP U
HVJTK
HVJT

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External links[edit]