Isolates in a corridor of migrations: a high-resolution analysis of Y-chromosome variation in Jordan

Isolates in a corridor of migrations: a high-resolution analysis of Y-chromosome variation in Jordan

A high-resolution, Y-chromosome analysis using 46 binary markers has been carried out in two Jordan populations, one from the metropolitan area of Amman and the other from the Dead Sea, an area geographically isolated. Comparisons with neighboring populations showed that whereas the sample from Amman did not significantly differ from their Levantine neighbors, the Dead Sea sample clearly behaved as a genetic outlier in the region. Its high R1*-M173 frequency (40%) has until now only been found in northern Cameroonian samples. This contrasts with the comparatively low presence of J representatives (9%), which is the modal clade in Middle Eastern populations, including Amman. The Dead Sea sample also showed a high presence of E3b3a-M34 lineages (31%), which is only comparable to that found in Ethiopians. Although ancient and recent ties with sub-Saharan and eastern Africans cannot be discarded, it seems that isolation, strong drift, and/or founder effects are responsible for the anomalous Y-chromosome pool of this population. These results demonstrate that, at a fine scale, the smooth, continental clines detected for several Y-chromosome markers are often disrupted by genetically divergent populations.

Finally, I have located the full text for this paper.

y-chr-jordy-chr-jord-2

I’d guess the m34 is a legacy from the Kebaran’s m123 that kept m78 company in it’s expansion. Cruciani had it as Asian in origin and present in East Africa from later back migrations. You also see  Asian R1-M173, also found in Cameroon.

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