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Thursday, November 17, 2011

Neolithic Patrilineal Signals on the Armenian Plateau


A recently released study on the Y-Chromosomes of Armenians from four distinct regions, the Ararat Valley, Gardman, Lake Van and Sasun shows a predominence of the J2-M172 haplogroup, combined with R1b, G2 and E1b1c1. The paper indicates settlement and population expansion dating back to the neolithic. This study , undertaken by Herrera, Underhill, Regueiro and others, recorded frequencies, calculated variance and compared these figures with neighbouring populations in an attempt to understand the migrations of the most frequent haplogroups observed within a neolithic context.


Frequencies of J2-M172 were very high, at 30% in the Gardman Region of present day Azerbaijan and 29% in the Lake Van region of eastern Turkey. J2a-M410(xM67) was the most frequent haplogroup subclade observed. A single P279 haplotype (J2a3), an extremely rare sublcade of J2 was also observed. Haplotype diversity, often used to determine the age of a particular haplogroup, was highest in neighbouring Palestine, followed by Crete, Syria, Greece and Lebanon. These figures, the authors suggest, could be indicative of an arrival of J2 chromosomes to the Armenian Plateau from the Levant possibly coinciding with the expansion of Agriculture.


The data observed in the Armenian Plateau, while carrying frequencies of Haplogroup J2 common in other areas of the Middle East, showed a much higher level of R1b, a correlation not observed in neighbouring populations like Iran, Iraq and the Levant. The authors suggest both R1b and J2, combined with other haplogroups E1b1b1-M35 and G2a are all indicative of Neolithic expansions and migrations. Yet R1b stands out from this group as it shows a very different frequency and spread from J, E and G haplogroups, which are much more frequent in the Fertile Crescent.

Wednesday, August 24, 2011

Genetic Diversity on the Comoros Islands show Seafaring Influence on Settlement




A recent Study in the European Journal of Human Genetics explores the rich and diverse history of the peoples of the Comoros islands. The Comoros islands are situated in the western Indian Ocean off the coast of Tanzania. Y chromosome and mitochondrial analysis showed a strong male genetic influence from South Asia and the Middle East, the latter attributed by authors to be as a result of settlement of Shirazi Persian Traders on the islands some 1000 years ago.


J2a, M410 was detected at a rate of 7% on the sample set of 381 Y Chromosomes. Interestingly, rare J* (xM172 xM267) was also found among samples from the Comoros.

The J1 and J2 data along with G2a and E1b1b data is attributed by authors to have come directly from a Middle Eastern origin and mostly from Shirazi Traders from the city of Shiraz in present day Iran.


By 1000 YBP, the Shirazi, traders with origins in the Persian city of Shiraz in present day Iran, had established themselves on the island of Kilwa. The Shirazi were responsible for the generalisation of Islam on the Swahili coast by 500 YBP. They had built mosques on Kilwa, Zanzibar and Anjouan by 800 YBP...A possible source of the Northern Y chromosomes is therefore the Shirazi traders from Southern Iran who established trading posts on the Comoros by 800 YBP.
Link

Monday, May 30, 2011

Haplogroup J2 subclade M340 downstream of P279

Recent testing at Family Tree DNA has confirmed that a very rare subclade of J2, M340 reported in Anatolia in the paper "Excavating Y-Chromosome Haplotype Strata in Anatolia" has been shown to reside downstream of an equally rare subclade P279. Both P279 and M340 reside upstream of L26 and L27, SNP's derived in many but not all M172 haplotypes.


To date only 4 cases of the P279 subclade (formerly referred to as J2a3) have been reported FTDNA as well as 2 cases from published data. King and Underhill reported M340 in a sample from region 8-Western Coastal Anatolia. Other known cases to date are also from Anatolia, Syria, and single samples have been reported with origins in Southern Russia and Southern France.

Tuesday, March 15, 2011

The coming of the Greeks to Provence and Corsica


A new paper released by King, Underhill, Chiaroni et al tries to unravel the Y chromosome contribution of ancient greek settlements to the Southern French regions of Provence and Corsica. Their conclusions in analyzing the data is that upwards of 17% of the paternal lineages in Provence could be of Ancient Greek origin. The study itself focuses on E1b1b V-13 as the signature greek marker. Their conclusions also suggest that southern France had little contribution from the Neolithic period. However, how they arrived at these conclusions, while they may be valid, could be, in part, erroneous. Southern France, especially around the testing areas along the Rhone was not simply a Roman territory, it was part of "Rome" itself, with senatorial representation. The study tries to negate the contribution of E-V13 from Roman sources by comparing Provence to other Roman conquered areas such as Spain and England. This comparison is apples and oranges as southern France was far more tightly integrated into the Roman Empire than most other areas outside present day Italy. Therefore, some of the E-V13 found in southern france may be indicative of Roman settlement and not just of Greek origin.


The paper also suggests that Haplogroup subclades G2a3a-M406 and J2a4h-M530 are indicative of Neolithic migrations. And therefore the absence of these subclades suggests little or no Neolithic contribution to the present day genetic makeup in Provence. This assumption can lead to false conclusions as G2a3a and J2a4h are likely indicative of multiple origins from the Middle East and based on certain dating methods could be indicative of post-neolithic migrations. So, the authors conceivably could be looking at the right haplogroups but the wrong subclades to estimate Neolithic contributions to the present day genetic makeup of Southern France.


Criticisms aside, the authors provide solid evidence that Greek settlement in southern France is evidenced in today's genetic makeup of men from the region. There are some clear correlations of haplotypes and their study involves a much deeper analysis both of subclades and haplotype STR's allowing for more accurate comparisons. Combined with archaelogical evidence, viticulture and historical knowledge, this region of southern France carries with it, traces of ancient Greek origins in their genes as well.


Looking at J2-M172, the authors found 10% derived M172 haplotypes in their sample study. 8% were derived for M530, J2a4h with 445=6 while 2% were derived for J2a4b, M67. Many J2 subclades were completely absent from the region including J2a4b1-M92, J2a4h with 445=10, J2a*, J2a4* and all subclades of J2b.

Tuesday, December 14, 2010

Haplogroup J2 in the Maronites of Lebanon

A recent paper by the genographic consortium, Influences of History, Geography and Religion on Genetic Structure: The Maronites of Lebanon, demonstrates again the ancient and deep link between Haplogroup J2 and Lebanon. M172, Haplogroup J2 was the most frequent haplogroup found in all 3 Lebanese groups-Lebanese Muslims, Orthodox and Maronites. The frequency of Haplogroup J2 in the Lebanese Maronite community was 34.74%, one of the highest frequencies of M172 published to date. The study also showed however that Haplogroup J2 was found in 26.23% of Lebanese Muslims and 25.85% of Lebanese Greek Orthodox also being the most frequent haplogroup in these respective communities. The aim of the study was to describe the genetic structure of Lebanon and the effect of how social history may have contributed to genetic differentiation between these Lebanese religious groups. While the study did show some minor variance between the communities genetic structure, it revealed no significant distinction of major haplogroups. Supplemental data however did show that J2-M172 with DYS 391=9, often a characteristic of the L70 subclade of YCC Haplogroup J2a4h was almost completely limited to the Lebanese Christian population.


The Maronite community in Lebanon dates back to the 5th Century and is among the first Christian communities in the Near East. The liturgical language of the Maronite Church is Aramaic (Syriac). Their initial settlements were in the Mountains of Lebanon where they remained relatively isolated until the time of the Crusades. They are one of the largest Christian sects in Lebanon. The very high presence of Haplogroup J2-M172 among Maronites strongly suggests J2 was among the founding lineages of the community.

Monday, February 1, 2010

New L267 SNP may define distinct cluster of J2a4


Family Tree DNA's Walk Through the Y program has yielded hundreds of new SNP's that are helping to define the Y-Chromosome Tree. One such SNP, named L267 was recently found in a participant in the program whose paternal origin lies in Calabria, Southern Italy. The mutation, an A to G transition at position 2948591 on the Y chromosome is thus far, unique to this participant. The mutation was not found in other participants from other J2a4 subclades, J2-M67 and J2-L25 (rs34534058). Thus, it appears L267 could define a subclade under J2a4.



Similar haplotypes come largely from Eastern Anatolia and Armenia indicative of the possibility of a more recent spread from Anatolia to Italy for this cluster. The cluster can be viewed in the Haplogroup J project's results identified as J2a4 Cluster C. Further testing of this SNP is in progress.


Additional SNP's have also been identified in J2a4h (L25) including L192.2, L229, L230, L231, L243, L254 and L264 which so far look to define clusters within this subclade of J2, M172.

Monday, January 25, 2010

Indian Muslim population shows genetic affinity with non-Muslim Indian Geographic Neighbours

A 2009 study by India's National DNA Analysis Centre shows Indian Muslims display a genetic affinity with their neighbouring Non-Muslim populations along with low levels of Arabian, Central Asian and Iranian admixture. The study sampled 431 Indian Muslims from Uttar Pradesh, Gujarat, Andhra Pradesh and Tamil Nadu. The results showed distinctions between the Muslim communities based on geographic origins and a greater affinity to their neighbouring non-muslims than to each other. However, the study also does note a contribution to the genetic structure of Indian Muslims coming from Iranian and Arabian populaitons. The study does show some distinctive Y-DNA haplogroup frequencies especially in Haplogroup J:


Most noteworthy were the J2, J2a and JxJ2 frequencies of the Indian Shia population which were substantially higher than those of Indian Non-Muslims.

The spread of Islam in India was predominantly cultural conversion association with minor but still detectable levels of gene flow from outside, primarily from Iran and Central Asia, rather than directly from the Arabian Peninsula.
Traces of sub-Saharan and Middle Eastern lineages in Indian Muslim populations