@article{
 title = {Human X-chromosomal lineages in Europe reveal Middle Eastern and Asiatic contacts},
 type = {article},
 year = {2004},
 identifiers = {[object Object]},
 pages = {301-311},
 volume = {12},
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 group_id = {b2078731-0913-33b9-8902-a53629a24e83},
 last_modified = {2017-06-19T13:44:31.550Z},
 tags = {03/06/15},
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 abstract = {Within Europe, classical genetic markers, nuclear autosomal and Y-chromosome DNA polymorphisms display an east-west frequency gradient. This has been taken as evidence for the westward migration of Neolithic farmers from the Middle East. In contrast, most studies of mtDNA variation in Europe and the Middle East have not revealed clinal distributions. Here we report an analysis of dys44 haplotypes, consisting of 35 polymorphisms on an 8 kb segment of the dystrophin gene on Xp21, in a sample of 1203 Eurasian chromosomes. Our results do not show a significant genetic structure in Europe, though when Middle Eastern samples are included a very low but significant genetic structure, rooted in Middle Eastern heterogeneity, is observed. This structure was not correlated to either geography or language, indicating that neither of these factors are a barrier to gene flow within Europe and/or the Middle East. Spatial autocorrelation analysis did not show clinal variation from the Middle East to Europe, though an underlying and ancient east-west cline across the Eurasian continent was detected. Clines provide a strong signal of ancient major population migration(s), and we suggest that the observed cline likely resulted from an ancient, bifurcating migration out of Africa that influenced the colonizing of Europe, Asia and the Americas. Our study reveals that, in addition to settlements from the Near East, Europe has been influenced by other major population movements, such as expansion(s) from Asia, as well as by recent gene flow from within Europe and the Middle East.European Journal of Human Genetics (2004) 12, 301-311. doi:10.1038/sj.ejhg.5201097 Published online 15 October 2003},
 bibtype = {article},
 author = {Xiao, F X and Yotova, V and Zietkiewicz, E and Lovell, A and Gehl, D and Bourgeois, S and Moreau, C and Spanaki, C and Plaitakis, A and Moisan, J P and Labuda, D},
 journal = {Eur J Hum Genet},
 number = {4}
}

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Clines provide a strong signal of ancient major population migration(s), and we suggest that the observed cline likely resulted from an ancient, bifurcating migration out of Africa that influenced the colonizing of Europe, Asia and the Americas. 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