Haplogroup R2 (Y-DNA)
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2008-05-28T17:06:47Z
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{{Infobox haplogroup
| name =R2
| map =
| origin-date =25,000 years BP
| origin-place =Central Asia
| ancestor =[[Haplogroup R (Y-DNA)|R]]
| descendants =
| mutations =M124
| members =[[Sinti]] ~50%
}}
'''R2''' is a [[Human Y-chromosome DNA haplogroups|Y-chromosome haplogroup]] characterized by [[genetic marker]] M124, and is rarely found outside India, Pakistan, Iran, and southern Central Asia.
==Term history==
Before the publication of the 2005 Y-Chromosome Phylogenetic Tree, haplogroup R2 was known as Haplogroup “P1” and formerly thought to be a sister [[clade]] of [[Haplogroup R (Y-DNA)|Haplogroup R]] rather than [[derived]] from it.<ref name=jgm2006>{{Harvcoltxt|Manoukian|2006}}</ref>
==Origins==
According to [[the Genographic Project]] conducted by the [[National Geographic Society]], haplogroup R2 arose about 25,000 years ago in southern Central Asia, and its members migrated southward as part of the second<ref>The first consisted of African migrants who traveled along the Indian coastline some 50,000 to 60,000 years ago.</ref> major wave of human migration into India.<ref name=genographic>{{Citation | contribution = Atlas of the Human Journey | author = National Geographic Society | author-link = National Geographic Society | title = The Genographic Project | publisher = National Geographic Society | place = Washington DC | year = 2005 | contribution-url = https://www3.nationalgeographic.com/genographic/atlas.html | url = https://www3.nationalgeographic.com/genographic/index.html}}.</ref>
According to {{Harvcoltxt|Sengupta et al.|2006}},
<blockquote>uncertainty neutralizes previous conclusions that the intrusion of HGs R1a1 and R2 from the northwest in Dravidian-speaking southern tribes is attributable to a single recent event. Rather, these HGs contain considerable demographic complexity, as implied by their high haplotype diversity. Specifically, they could have actually arrived in southern India from a southwestern Asian source region multiple times, with some episodes considerably earlier than others.</blockquote>
==Distribution==
At least 90% of R2 individuals are located in the [[Indian sub-continent]].<ref name=jgm2006>{{Harvcoltxt|Manoukian|2006}}</ref> It is also reported in [[Caucasus|Caucasian]] and [[Central Asia]]n populations.
<center>
{| class="wikitable"
|+Frequency of R2 in Social and Linguistic Subgroups of Indian Populations<br>(Source: {{Harvnb|Sengupta et al.|2006}})
|-
!
!width=110px| Tibeto-Burman
!width=110px| Austro-Asiatic
!width=110px| Dravidian
!width=110px| Indo-European
|-
!width=110px| Tribe
|align=center| 5.75% ||align=center| 10.94% ||align=center| 5.00% ||align=center| -
|-
! Lower Caste
|align=center| - ||align=center| - ||align=center| 13.79% ||align=center| 10.00%
|-
! Middle Caste
|align=center| - ||align=center| - ||align=center| 3.53% ||align=center| 18.75%
|-
! Upper Caste
|align=center| - ||align=center| - ||align=center| 10.17% ||align=center| 16.28%
|}
</center>
Haplogroup R2, along with haplogroups [[Haplogroup H (Y-DNA)|H]], [[Haplogroup L (Y-DNA)|L]], [[Haplogroup R1a1 (Y-DNA)|R1a1]], and [[Haplogroup J2 (Y-DNA)|J2]], forms the majority of the South Asian male population. The frequency is around 10-15% in [[India]] and [[Sri Lanka]] and 7-8% in [[Pakistan]]. Its spread within South Asia is very extensive, ranging from [[Balochistan (Pakistan)|Baluchistan]] in the west to [[Bengal]] in the east; [[Hunza]] in the north to [[Sri Lanka]] in the south.
Within South Asia, [[Sinhalese people|Sinhalese]] have a frequency of 38% while West [[Bengalis]] have a frequency of 23%. The [[Parsee]]s in Pakistan have this lineage at around 20%. Other South Asian communities that have a reasonably high frequency include Lodha, an Austro-Asiatic tribe in East India, with 35%, [[Pallan]]s, a Dravidian community in South India with 14% and Konkanasth or Chitpavan Brahmins of Western India with 9%. This lineage also forms 5% of [[Punjabi]] males. The R2 haplogroup is also found in 14% of the [[Burusho]] people who speak the language isolate called [[Burushaski]]<ref>{{cite journal|title=Y-chromosomal evidence for a limited Greek contribution to the Pathan population of Pakistan|author=Firasat S, Khaliq S, Mohyuddin A, Papaioannou M, Tyler-Smith C, Underhill PA, Ayub Q}}</ref>.
Some of the other studies like Bamshad et al., 2001, Kivisild et al., 2003 found Haplogroup 1(the old representation for non-R1a1 Haplogroup R [[subclade]]s) at around 40% among [[Telugu people|Telugus]] of coastal [[Andhra Pradesh]]. The identification of this Haplogroup with R2 is confirmed from Sanghamitra Sahoo et al., 2006 study which observed R2 ranging from 35% to 55% among non-Brahmin castes of this region.
Haplogroup R2 comprises 53% of Y-[[chromosomes]] among [[Sinti]] Roma, a subgroup of the Roma living in Germany who were relocated to Central Asia. This [[Roma people|Gypsy]] tribe has its ancient roots in India.
An R2 frequency of 15.8% was observed among [[Chechens]] but may not be representative because the [[sample size]] was only 19 individuals.<ref>{{cite journal | author = Nasidze et al. | year = 2003 | title = Testing hypotheses of language replacement in the Caucasus: evidence from the Y-chromosome | journal = Hum Genet | volume = 112 | pages = 255–261}}<br>{{Harvcoltxt|Manoukian|2006}}</ref>
R2 was found at an unusually high frequency of 44% among [[Kurmanji]]-speakers ([[Kurmanj]]s) in [[Georgia (country)|Georgia]], but at a much lower frequency of 8% among [[Kurmanj]]s in [[Turkmenistan]].<ref>{{cite journal | author = Nasidze et al. | year = 2005 | title = MtDNA and Y-chromosome Variation in Kurdish Groups | journal = Annals of Human Genetics | volume = 69 | pages = 401–412 | doi = 10.1046/j.1529-8817.2005.00174.x}}</ref>
In the Caucasus, around 3% of [[Azerbaijanis]], 2% of [[Armenians]], and 1% of [[Georgians]] belong to the R2 haplogroup. Approximately 1% of [[Turkish people|Turks]] also belong to this haplogroup.<ref>Cinnioğlu et al. (2003), "[http://hpgl.stanford.edu/publications/HG_2004_v114_p127-148.pdf Excavating Y-chromosome haplotype strata in Anatolia]."</ref>
In Central Asia, [[Tajikistan]] shows Haplogroup R2 at 6%, while the other [[-stan#Countries|'-stan' states]] vary around 2%. [[Bartangi]]s of Tajikistan have a high frequency of R2 at about 17%.
This haplogroup is rare among Europeans and non-existent in African, East Asian, Native American and Native Australian populations. Among Europeans there are at least two confirmed clusters of R2 individuals among [[Ashkenazi]] Jews, which may reflect either an Iranian or a Central Asian (Khazar) origin of a portion of this group.
==Manoukian's (2006) summary of the Genographic Project==
The following is [[Haplogroup R2 (Y-DNA)#CITEREFManoukian2006|Manoukian's (2006)]] summary of the findings of [[the Genographic Project]] conducted by the [[National Geographic Society]] and directed by [[Spencer Wells]]:
<blockquote style="background: white; border: 1px solid black; padding: 1em;">
* Haplogroup R, the ancestral clade to R1 and R2, appeared on the Central Asian Steppes around 35,000 to 30,000 years ago.
* R1, sister clade to R2, moved to the West from the Central Asian Steppes around 35,000 to 30,000 years ago. R1 pockets were established, from where R1a and R1b emerged.
* R2 moved into the Indian sub-continent around 25,000 years ago. The routes taken are not clear, although the Indus and Ganges rivers are possible theories put forward.
</blockquote>
==Manoukian's (2006) summary of Sengupta et al. (2006)==
[[Haplogroup R2 (Y-DNA)#CITEREFManoukian2006|Manoukian's (2006)]] summary of {{Harvcoltxt|Sengupta et al.|2006}} is as follows:
<blockquote style="background: white; border: 1px solid black; padding: 1em;">
* Haplogroup R2 is present both in Dravidian and Indo-European populations, meaning that R2 has a pan-Indian presence, and not restricted to any linguistic group.
* Haplogroup R2 has a more significant presence in middle and upper castes.
* The frequencies of R2 seem to mirror the frequencies of R1a (i.e. both lineages are strong and weak in the same social and linguistic subgroups). This may indicate that both R1a and R2 moved into India at roughly the same time or co-habited, although more research is needed.
* R1a1 and R2 haplogroups indicate demographic complexity that is inconsistent with a recent single history.
* R2 has a particularly strong presence in the Indian states of West Bengal, Uttar Pradesh and Gujarat, and in the area of Mumbai (Bombay).
* The paper claims that there is no evidence that Central Asia was the source of the R1a and R2 lineages in India. The theory that Central Asia could have been the recipient of the two lineages from India should not be ruled out.
</blockquote>
== Relationship to other haplogroups ==
R2 is a subgroup of [[Haplogroup R (Y-DNA)|Haplogroup R]] (M207).
{{Clade
| label1=[[Haplogroup R (Y-DNA)|Haplogroup R]]
| 1={{Clade
| label1=Haplogroup R1
| 1={{Clade
| label1=Haplogroup R1a
| 1={{Clade
| 1=[[Haplogroup R1a1 (Y-DNA)|Haplogroup R1a1]]}}
| 2=[[Haplogroup R1b (Y-DNA)|Haplogroup R1b]]}}
| 2=[[Haplogroup R2 (Y-DNA)|Haplogroup R2]]}}
}}
{{Y-DNA}}
==Prediction with Haplotypes==
[[Haplotype]] can be used to predict haplogroup. The chances of any person part of this haplogroup is the highest if [[List of DYS markers|DYS391]]=10, [[List of DYS markers|DYS392]]=10 and [[List of DYS markers|DYS426]]=12.
==See also==
*[[Genetics and Archaeogenetics of South Asia#R1a1 and R2|Genetics and Archaeogenetics of South Asia: R1a1 and R2]]
*[[Genealogical DNA test]]
==Notes==
<references/>
==References==
* {{Citation | last=Manoukian | first=Jean-Grégoire | author-link= | publication-date=2006-12-01 | year=2006 | title=A Synthesis of Haplogroup R2 | url=http://www.ethnoancestry.com/index_files/index_data/Haplogroup_R2_Manoukian.pdf}}.
* {{Citation | author=Sengupta et al. | year=2006 | title=Polarity and Temporality of High-Resolution Y-Chromosome Distributions in India Identify Both Indigenous and Exogenous Expansions and Reveal Minor Genetic Influence of Central Asian Pastoralists | periodical=Am. J. Hum. Genet. | volume=78 | pages=202-221}}.
==External links==
* [http://www.familytreedna.com/public/india The India Genealogical DNA Project]
[[Category:Human Y-DNA haplogroups|R2]]
[[ca:Haplogrup R2 del cromosoma Y humà]]