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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 2548 Thanos5150 02-Jun-17 15:42
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 718 Laird Scranton 02-Jun-17 15:53
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 627 Thanos5150 02-Jun-17 18:08
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 658 Laird Scranton 02-Jun-17 20:08
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 671 Thanos5150 02-Jun-17 23:19
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 651 Laird Scranton 03-Jun-17 03:56
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 605 Notinham 03-Jun-17 05:04
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 564 Thanos5150 03-Jun-17 14:49
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 561 Notinham 03-Jun-17 16:00
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 831 Eddie Larry 04-Jun-17 00:38
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 403 Heliograph 29-Jun-17 11:06
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 493 Eddie Larry 29-Jun-17 14:16
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 499 Thanos5150 29-Jun-17 16:33
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 625 Notinham 02-Jun-17 16:06
Ancient Egyptians were closely related to people who lived along the eastern Mediterranean 623 HH Holmes 26-Jun-17 19:38
Mod Note > Duplicate Topic Merged 482 Dr. Troglodyte 27-Jun-17 12:39
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 515 Heliograph 29-Jun-17 10:53
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 524 MDaines 29-Jun-17 14:06
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 593 Thanos5150 29-Jun-17 16:25
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 522 MDaines 30-Jun-17 10:56
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 571 Thanos5150 30-Jun-17 13:56
Egyptian Style Head? 507 Dr. Troglodyte 30-Jun-17 14:30
Re: Egyptian Style Head? 555 Eddie Larry 30-Jun-17 14:36
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 507 MDaines 01-Jul-17 07:53
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 569 Thanos5150 01-Jul-17 17:28
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 498 Eddie Larry 01-Jul-17 18:17
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 604 Thanos5150 01-Jul-17 18:38
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 594 MDaines 01-Jul-17 19:58
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 590 Thanos5150 03-Jul-17 14:05
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 504 Thanos5150 29-Jun-17 16:39
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 421 R Avry Wilson 29-Jun-17 17:10
Cuneiform vs Hieroglyph 603 Dr. Troglodyte 29-Jun-17 18:22
Re: Cuneiform vs Hieroglyph 510 Thanos5150 01-Jul-17 20:19
Re: Cuneiform vs Hieroglyph 557 Thanos5150 08-Jul-17 16:12
Re: Cuneiform vs Hieroglyph 294 Eddie Larry 08-Jul-17 18:04
Re: Cuneiform vs Hieroglyph 462 Thanos5150 08-Jul-17 19:30
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 400 Thanos5150 30-Jun-17 20:09
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 463 R Avry Wilson 01-Jul-17 01:55
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 439 Thanos5150 01-Jul-17 03:15
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 552 R Avry Wilson 02-Jul-17 22:02
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 463 MDaines 03-Jul-17 08:04
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 504 Thanos5150 03-Jul-17 14:10
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 431 Thanos5150 03-Jul-17 16:58
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 533 R Avry Wilson 03-Jul-17 22:56
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 369 Thanos5150 04-Jul-17 21:55
The scientific study 385 drrayeye 04-Jul-17 11:09
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 527 Notinham 03-Jul-17 14:17
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 528 Brian Patterson 04-Jul-17 17:58
The genetic evidence 582 drrayeye 04-Jul-17 19:48
Re: The genetic evidence 419 Brian Patterson 05-Jul-17 12:45
Re: The genetic evidence 432 drrayeye 05-Jul-17 15:40
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 620 lostsheep 04-Jul-17 22:34


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