Iranian Peoples - Genetics

Genetics

Two Y-DNA haplogroups are supposed to be connected with Iranic peoples: J2 and R1a1.

R1 is more closely linked to Iranians, while R1b is linked to Europeans.

J2a:

Haplogroup J2 especially the clade J2a is frequently found among almost all groups of Iranic people. In comparison with the haplogroup R1a1, J2 is not only restricted to geographically eastern and western Iranic populations, but also found among north-western and south-western Iranic populations such as the Bakhtiaris and Mazanderani, as well as geographically north-western Iranic Ossetians. Despite its supposed origin in the fertile crescent, J2a is also found among Iranic populations in the east such as the Yagnobi which are of Soghdian origin as well as the Parsis of India. Beside the relatively high percentage among the Yagnobis in Central Asia, other Iranic populations tend to have a higher frequency of J2a when compared to neighboring Turkic populations. The relatively strong presence of J2a among Ossetians as well as Yagnobis proves distant from the supposed Mesopotamian origin region of J2, are carriers of this Haplogroup.

In the Indo-Iranian context, the occurrence of J2a in South Asia is limited to caste populations, with the highest frequencies found among northern areas of South Asia. Compared with R1a1, J2a shows a more conservative distribution, stronger limited to Indo-Iranian origin groups.

R:

Many Haplotypes of Y-chromosomal Haplogroup R have been found throughout the Iranian Plateau, and it has been suggested that this Haplogroup may have had its origins in Iran. Cambridge University geneticist Toomas Kivisild has suggested : "Given the geographic spread and STR diversities of sister clades R1 and R2, the latter of which is restricted to India, Pakistan, Iran, and southern central Asia, it is possible that southern and western Asia were the source for R1 and R1a differentiation."(Kivisild et al. 2003). A similar conclusion was given by population geneticist Miguel Regueiro in the Journal of Human Heredity (Regueiro et al. Human Heredity vol. 61 (2006), pp. 132–143)

Genetic studies conducted by Cavalli-Sforza have revealed that Iranians have weak correlation with Near Eastern groups, and are closer to surrounding Indo-Europeans speaking populations. This study is partially supported by another one, based on Y-Chromosome haplogroups.

The findings of this study reveal many common genetic markers found among the Iranian people from the Tigris river of Iraq to the Indus of Pakistan. This correlates with the Iranian languages spoken from the Caucasus to Kurdish areas in the Zagros region and eastwards to western Pakistan and Tajikistan and parts of Uzbekistan in Central Asia. The extensive gene flow is perhaps an indication of the spread of Iranian-speaking people, whose languages are now spoken mainly on the Iranian plateau and adjacent regions.

Another recent study of the genetic landscape of Iran was done by a team of Cambridge geneticists led by Dr. Maziar Ashrafian Bonab (an Iranian Azarbaijani). Bonab remarked that his group had done extensive DNA testing on different language groups, including Indo-European and non Indo-European speakers, in Iran. The study found that the Azerbaijanis of Iran do not have a similar FSt and other genetic markers found in Anatolian and European Turks. However, the genetic Fst and other genetic traits like MRca and mtDNA of Iranian Azeris were identical to Persians in Iran. Azaris of Iran also show very close genetic ties to Kurds.