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Chad Genetic Diversity Reveals an African History Marked by Multiple Holocene Eurasian Migrations
Understanding human genetic diversity in Africa is important for interpreting the evolution of all humans, yet vast regions in Africa, such as Chad, remain genetically poorly investigated. Here, we use genotype data from 480 samples from Chad, the Near East, and southern Europe, as well as whole-genome sequencing from 19 of them, to show that many populations today derive their genomes from ancient African-Eurasian admixtures. We found evidence of early Eurasian backflow to Africa in people speaking the unclassified isolate Laal language in southern Chad and estimate from linkage-disequilibrium decay that this occurred 4,750–7,200 years ago. It brought to Africa a Y chromosome lineage (R1b-V88) whose closest relatives are widespread in present-day Eurasia; we estimate from sequence data that the Chad R1b-V88 Y chromosomes coalesced 5,700–7,300 years ago. This migration could thus have originated among Near Eastern farmers during the African Humid Period. We also found that the previously documented Eurasian backflow into Africa, which occurred 3,000 years ago and was thought to be mostly limited to East Africa, had a more westward impact affecting populations in northern Chad, such as the Toubou, who have 20%–30% Eurasian ancestry today. We observed a decline in heterozygosity in admixed Africans and found that the Eurasian admixture can bias inferences on their coalescent history and confound genetic signals from adaptation and archaic introgression.

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DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 2707 Thanos5150 02-Jun-17 15:42
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 770 Laird Scranton 02-Jun-17 15:53
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 675 Thanos5150 02-Jun-17 18:08
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 697 Laird Scranton 02-Jun-17 20:08
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 720 Thanos5150 02-Jun-17 23:19
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 691 Laird Scranton 03-Jun-17 03:56
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 648 Notinham 03-Jun-17 05:04
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 607 Thanos5150 03-Jun-17 14:49
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 619 Notinham 03-Jun-17 16:00
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 883 Eddie Larry 04-Jun-17 00:38
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 447 Heliograph 29-Jun-17 11:06
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 536 Eddie Larry 29-Jun-17 14:16
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 583 Thanos5150 29-Jun-17 16:33
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 658 Notinham 02-Jun-17 16:06
Ancient Egyptians were closely related to people who lived along the eastern Mediterranean 662 HH Holmes 26-Jun-17 19:38
Mod Note > Duplicate Topic Merged 512 Dr. Troglodyte 27-Jun-17 12:39
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 554 Heliograph 29-Jun-17 10:53
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 561 MDaines 29-Jun-17 14:06
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 640 Thanos5150 29-Jun-17 16:25
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 559 MDaines 30-Jun-17 10:56
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 639 Thanos5150 30-Jun-17 13:56
Egyptian Style Head? 533 Dr. Troglodyte 30-Jun-17 14:30
Re: Egyptian Style Head? 598 Eddie Larry 30-Jun-17 14:36
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 571 MDaines 01-Jul-17 07:53
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 605 Thanos5150 01-Jul-17 17:28
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 535 Eddie Larry 01-Jul-17 18:17
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 681 Thanos5150 01-Jul-17 18:38
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 648 MDaines 01-Jul-17 19:58
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 636 Thanos5150 03-Jul-17 14:05
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 558 Thanos5150 29-Jun-17 16:39
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 445 R Avry Wilson 29-Jun-17 17:10
Cuneiform vs Hieroglyph 651 Dr. Troglodyte 29-Jun-17 18:22
Re: Cuneiform vs Hieroglyph 566 Thanos5150 01-Jul-17 20:19
Re: Cuneiform vs Hieroglyph 630 Thanos5150 08-Jul-17 16:12
Re: Cuneiform vs Hieroglyph 326 Eddie Larry 08-Jul-17 18:04
Re: Cuneiform vs Hieroglyph 504 Thanos5150 08-Jul-17 19:30
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 441 Thanos5150 30-Jun-17 20:09
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 515 R Avry Wilson 01-Jul-17 01:55
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 487 Thanos5150 01-Jul-17 03:15
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 578 R Avry Wilson 02-Jul-17 22:02
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 527 MDaines 03-Jul-17 08:04
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 565 Thanos5150 03-Jul-17 14:10
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 489 Thanos5150 03-Jul-17 16:58
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 567 R Avry Wilson 03-Jul-17 22:56
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 415 Thanos5150 04-Jul-17 21:55
The scientific study 439 drrayeye 04-Jul-17 11:09
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 562 Notinham 03-Jul-17 14:17
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 563 Brian Patterson 04-Jul-17 17:58
The genetic evidence 622 drrayeye 04-Jul-17 19:48
Re: The genetic evidence 457 Brian Patterson 05-Jul-17 12:45
Re: The genetic evidence 474 drrayeye 05-Jul-17 15:40
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 667 lostsheep 04-Jul-17 22:34


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