Am I right in thinking that Sardinians are the closest non-africans population to Cushites?
They seem to be made up almost exclusively, of neolithic near-eastern farmers. Somalis have about 30-45% neolithic Middle-eastern DNA.
Don't forget the Mesolithic European input in Sardinia. Those high figures don't all derive from the Levant.
I am E-L29 (E1b1b1c1a), which is downstream from E-M123, which in Europe peaks in Sicily. My ancestors are from England, Denmark and Switzerland. My maternal line is U5a2a, downstream from mesolithic hunter-gatherers. This is from my 23andme:
'"Origin and Migrations of Haplogroup E-M123
Your paternal line traces back to the common ancestor of haplogroup E-M123, a man who may have lived in eastern Africa over 20,000 years ago. At some time during the next 10,000 years, some of his descendants migrated north to the Levant and the Middle East, where the lineage is quite common today. In fact, evidence once suggested that the southern Levant may have been the birthplace of the haplogroup. It was there, soon after the Ice Age drew to a close 11,500 years ago, that humans first learned to domesticate cereals and livestock, and completely transformed their way of life. In fact, farming and herding were such successful strategies that populations boomed, sparking waves of migration into Europe and Africa about 8,000 years ago. Some of those men likely bore the E-M123 haplogroup, and as they migrated they introduced not only their technology and culture, but also the paternal lineage.
Today, some of the highest concentrations of men bearing haplogroup E-M123 and its diverse branches are found in eastern Africa, where they make up between 5 and 10% of men in parts of Ethiopia, Kenya, and Somalia. Farther east, nearly 10% of men tested in Oman and 8% in Yemen carry the haplogroup. And to the north, they are found at low frequencies among Egyptians, Algerians, Tunisians, and others.
The other great peak of men bearing E-M123 is in the southern Levant. They are spread throughout the Middle East and in present-day Turkey at frequencies of about 5%, and make up about 13% of the male population in Jordan. Though generally rare in Europe, E-M123 can be found among men along the Mediterranean Sea, and is at its most common in Sicily (7%) and Sardinia (4%). Even at the far western edge, the lineage found in the Iberian Peninsula, especially among men from Portugal and the Spanish region of Galicia."
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Note that this discussion of E-M123 does not include the downstream haplotypes that would include most Sardinians and Somalis.
E1b1b is rare in Europe, but included Hitler, Einstein and Napoleon. US President Lyndon Baines Johnson was also E1b1b. I share an ancestor with Napoleon.