Haplogroup N | |
---|---|
Possible time of origin | ~55-70,000 YBP [1] [2] or 50-65,000 YBP [3] |
Possible place of origin | Asia [4] [5] [6] [7] [8] or East Africa [9] [10] [11] |
Ancestor | L3 |
Descendants | N1'5, N2, N8, N9, N10, N11, N13, N14, N21, N22, A, I, O, R, S, X, Y, W |
Defining mutations | 8701, 9540, 10398, 10873, 15301 [12] |
Haplogroup N is a human mitochondrial DNA (mtDNA) clade. A macrohaplogroup, its descendant lineages are distributed across many continents. Like its sibling macrohaplogroup M, macrohaplogroup N is a descendant of the haplogroup L3.
All mtDNA haplogroups found outside of Africa are descendants of either haplogroup N or its sibling haplogroup M. M and N are the signature maternal haplogroups that define the theory of the recent African origin of modern humans and subsequent early human migrations around the world. The global distribution of haplogroups N and M indicates that there was likely at least one major prehistoric migration of humans out of Africa, with both N and M later evolving outside the continent. [7]
There is widespread agreement in the scientific community concerning the African ancestry of haplogroup L3 (haplogroup N's parent clade). [13] However, whether or not the mutations which define haplogroup N itself first occurred within Asia or Africa has been a subject for ongoing discussion and study. [13]
The out of Africa hypothesis has gained generalized consensus. However, many specific questions remain unsettled. To know whether the two M and N macrohaplogroups that colonized Eurasia were already present in Africa before the exit is puzzling.
Torroni et al. 2006 state that Haplogroups M, N and R occurred somewhere between East Africa and the Persian Gulf. [14]
Also related to the origins of haplogroup N is whether ancestral haplogroups M, N and R were part of the same migration out of Africa, or whether Haplogroup N left Africa via the Northern route through the Levant, and M left Africa via Horn of Africa. This theory was suggested because haplogroup N is by far the predominant haplogroup in Western Eurasia, and haplogroup M is absent in Western Eurasia, but is predominant in India and is common in regions East of India. However, the mitochondrial DNA variation in isolated "relict" populations in southeast Asia and among Indigenous Australians supports the view that there was only a single dispersal from Africa. Southeast Asian populations and Indigenous Australians all possess deep rooted clades of both haplogroups M and N. [15] The distribution of the earliest branches within haplogroups M, N, and R across Eurasia and Oceania therefore supports a three-founder-mtDNA scenario and a single migration route out of Africa. [16] These findings also highlight the importance of Indian subcontinent in the early genetic history of human settlement and expansion. [17]
The hypothesis of Asia as the place of origin of haplogroup N is supported by the following:
A study (Vai et al. 2019), finds a basal branch of maternal haplogroup N in early Neolithic North African remains from the Libyan site of Takarkori. The authors propose that N most likely split from L3 in the Arabian peninsula and later migrated back to North Africa, with its sister haplogroup M also likely splitting from L3 in the Middle East, but also suggest that N may have possibly diverged in North Africa, and state that more information is necessary to be certain. [3]
According to Toomas Kivisild "the lack of L3 lineages other than M and N in India and among non-African mitochondria in general suggests that the earliest migration(s) of modern humans already carried these two mtDNA ancestors, via a departure route over the Horn of Africa. [9]
In 2019, a study by Vai et al. presented evidence of a basal branch of haplogroup N from the Neolithic Sahara. They suggest that N either diverged from haplogroup L3 in the Near East (possibly in the Arabian peninsula, following the exit of L3 from Africa), then back-migrated to North Africa, or that it instead may have originated in North Africa (having diverged from L3 there). [3]
Haplogroup N is derived from the ancestral L3 macrohaplogroup, which represents the migration discussed in the theory of the recent African origin of modern humans. Haplogroup N is the ancestral haplogroup to almost all clades today distributed in Europe and Oceania, as well as many found in Asia and the Americas. It is believed to have arisen at a similar time to haplogroup M.
Haplogroup N's derived clades include the macro-haplogroup R and its descendants, and haplogroups A, I, S, W, X, and Y.
Rare unclassified haplogroup N* has been found among fossils belonging to the Cardial and Epicardial culture (Cardium pottery) and the Pre-Pottery Neolithic B. [18] A rare unclassified form of N has been also been reported in modern Algeria. [19]
This phylogenetic tree of haplogroup N subclades is based on the paper by Mannis van Oven and Manfred Kayser Updated comprehensive phylogenetic tree of global human mitochondrial DNA variation [12] and subsequent published research.
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 |
A haplotype is a group of alleles in an organism that are inherited together from a single parent, and a haplogroup is a group of similar haplotypes that share a common ancestor with a single-nucleotide polymorphism mutation. More specifically, a haplotype is a combination of alleles at different chromosomal regions that are closely linked and that tend to be inherited together. As a haplogroup consists of similar haplotypes, it is usually possible to predict a haplogroup from haplotypes. Haplogroups pertain to a single line of descent. As such, membership of a haplogroup, by any individual, relies on a relatively small proportion of the genetic material possessed by that individual.
Haplogroup M is a human mitochondrial DNA (mtDNA) haplogroup. An enormous haplogroup spanning all the continents, the macro-haplogroup M, like its sibling the macro-haplogroup N, is a descendant of the haplogroup L3.
Haplogroup U is a human mitochondrial DNA haplogroup (mtDNA). The clade arose from haplogroup R, likely during the early Upper Paleolithic. Its various subclades are found widely distributed across Northern and Eastern Europe, Central, Western and South Asia, as well as North Africa, the Horn of Africa, and the Canary Islands.
Haplogroup R is a widely distributed human mitochondrial DNA (mtDNA) haplogroup. Haplogroup R is associated with the peopling of Eurasia after about 70,000 years ago, and is distributed in modern populations throughout the world outside of sub-Saharan Africa.
In human mitochondrial genetics, haplogroup B is a human mitochondrial DNA (mtDNA) haplogroup.
Haplogroup F is a human mitochondrial DNA (mtDNA) haplogroup. The clade is most common in East Asia and Southeast Asia. It has not been found among Native Americans.
In human mitochondrial genetics, Haplogroup A is a human mitochondrial DNA (mtDNA) haplogroup.
In human mitochondrial genetics, Haplogroup C is a human mitochondrial DNA (mtDNA) haplogroup.
In human mitochondrial genetics, Haplogroup D is a human mitochondrial DNA (mtDNA) haplogroup. It is a descendant haplogroup of haplogroup M, thought to have arisen somewhere in East Asia, between roughly 60,000 and 35,000 years ago.
Haplogroup L3 is a human mitochondrial DNA (mtDNA) haplogroup. The clade has played a pivotal role in the early dispersal of anatomically modern humans.
In human mitochondrial genetics, Haplogroup Z is a human mitochondrial DNA (mtDNA) haplogroup.
Haplogroup N (M231) is a Y-chromosome DNA haplogroup defined by the presence of the single-nucleotide polymorphism (SNP) marker M231.
In human genetics, a human mitochondrial DNA haplogroup is a haplogroup defined by differences in human mitochondrial DNA. Haplogroups are used to represent the major branch points on the mitochondrial phylogenetic tree. Understanding the evolutionary path of the female lineage has helped population geneticists trace the matrilineal inheritance of modern humans back to human origins in Africa and the subsequent spread around the globe.
In human mitochondrial genetics, Haplogroup Y is a human mitochondrial DNA (mtDNA) haplogroup.
In human mitochondrial genetics, Haplogroup M30 is a human mitochondrial DNA (mtDNA) haplogroup.
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In human mitochondrial genetics, L is the mitochondrial DNA macro-haplogroup that is at the root of the anatomically modern human mtDNA phylogenetic tree. As such, it represents the most ancestral mitochondrial lineage of all currently living modern humans, also dubbed "Mitochondrial Eve".
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Haplogroup C-M48 also known as C2b1a2 is a Y-chromosome DNA haplogroup.
Haplogroup D, also known as D-CTS3946, is a Y-chromosome haplogroup. Like its relative distant sibling, haplogroup E-M96, D-CTS3946 has the YAP+ unique-event polymorphism, which defines their parent, haplogroup DE. D-CTS3946 has two basal branches, D1 and D2. D1 and D2 are found primarily in East Asia, at low frequency in Central Asia and Southeast Asia, and at very low frequency in Western Africa and Western Asia.
Haplogroup L3 (the African clade that gave rise to the two basal non-African clades, haplogroups M and N) is 84,000 years old, and haplogroups M and N themselves are almost identical in age at 63,000 years old, with haplogroup R diverging rapidly within haplogroup N 60,000 years ago.
subclades. L3b d, L3e and L3f, for instance, are clearly of African origin, whereas haplogroup N is of apparently Eurasian origin
The scenario of a back-migration into Africa is supported by another feature of the mtDNA phylogeny. Haplogroup M's Eurasian sister clade, haplogroup N, which has a very similar age to M and no indication of an African origin
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