From Cavalli-Sforza's, The History and Geography of Human Genes
The genetic structure of the Iranian plateau and surrounding areas is complex. Here will be presented a summary of general genetic patterns of various populations, with a link to a full study for those who want further reading.
Analysis of Y-chromosome and mtDNA shows that Iranian populations retain homogenity. Most DNA markers are west Eurasian, matching the Aryan/Indo-European origins of the Iranian race. Indeed east Eurasian and south Asian gene flows are almost absent. Towards the east, east Eurasian genes increase, particularly among the Turkmen and Uzbeks. The Hazaras also exhibit an extremely high proportion of east Eurasian genes. However certain isolated groups in eastern mountainous locales have retained west Eurasian lineages. In addition Tajiks and most Pashtuns are still predominantly west Eurasian.
According to a study published by the American Journal of Human Genetics...
" A simple pattern underlies the mtDNA variation in this region: a west-to-east divide with a sharp boundary. Populations located west of the Indus basin, including those from Iran, Anatolia and the Caucasus, exhibit a common mtDNA lineage composition, consisting mainly of western Eurasian lineages, with a very limited contribution from South Asia and eastern Eurasia (fig. 1). Indeed, the different Iranian populations show a striking degree of homogeneity."
Find the full study here
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