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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 2434 Thanos5150 02-Jun-17 15:42
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 675 Laird Scranton 02-Jun-17 15:53
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 606 Thanos5150 02-Jun-17 18:08
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 637 Laird Scranton 02-Jun-17 20:08
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 644 Thanos5150 02-Jun-17 23:19
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 618 Laird Scranton 03-Jun-17 03:56
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 575 Notinham 03-Jun-17 05:04
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 549 Thanos5150 03-Jun-17 14:49
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 535 Notinham 03-Jun-17 16:00
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 791 Eddie Larry 04-Jun-17 00:38
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 374 Heliograph 29-Jun-17 11:06
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 464 Eddie Larry 29-Jun-17 14:16
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 470 Thanos5150 29-Jun-17 16:33
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 607 Notinham 02-Jun-17 16:06
Ancient Egyptians were closely related to people who lived along the eastern Mediterranean 592 HH Holmes 26-Jun-17 19:38
Mod Note > Duplicate Topic Merged 466 Dr. Troglodyte 27-Jun-17 12:39
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 496 Heliograph 29-Jun-17 10:53
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 494 MDaines 29-Jun-17 14:06
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 555 Thanos5150 29-Jun-17 16:25
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 494 MDaines 30-Jun-17 10:56
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 537 Thanos5150 30-Jun-17 13:56
Egyptian Style Head? 485 Dr. Troglodyte 30-Jun-17 14:30
Re: Egyptian Style Head? 539 Eddie Larry 30-Jun-17 14:36
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 473 MDaines 01-Jul-17 07:53
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 549 Thanos5150 01-Jul-17 17:28
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 454 Eddie Larry 01-Jul-17 18:17
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 570 Thanos5150 01-Jul-17 18:38
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 558 MDaines 01-Jul-17 19:58
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 574 Thanos5150 03-Jul-17 14:05
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 484 Thanos5150 29-Jun-17 16:39
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 402 R Avry Wilson 29-Jun-17 17:10
Cuneiform vs Hieroglyph 568 Dr. Troglodyte 29-Jun-17 18:22
Re: Cuneiform vs Hieroglyph 479 Thanos5150 01-Jul-17 20:19
Re: Cuneiform vs Hieroglyph 520 Thanos5150 08-Jul-17 16:12
Re: Cuneiform vs Hieroglyph 279 Eddie Larry 08-Jul-17 18:04
Re: Cuneiform vs Hieroglyph 429 Thanos5150 08-Jul-17 19:30
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 375 Thanos5150 30-Jun-17 20:09
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 425 R Avry Wilson 01-Jul-17 01:55
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 421 Thanos5150 01-Jul-17 03:15
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 536 R Avry Wilson 02-Jul-17 22:02
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 436 MDaines 03-Jul-17 08:04
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 472 Thanos5150 03-Jul-17 14:10
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 413 Thanos5150 03-Jul-17 16:58
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 505 R Avry Wilson 03-Jul-17 22:56
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 351 Thanos5150 04-Jul-17 21:55
The scientific study 360 drrayeye 04-Jul-17 11:09
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 493 Notinham 03-Jul-17 14:17
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 499 Brian Patterson 04-Jul-17 17:58
The genetic evidence 554 drrayeye 04-Jul-17 19:48
Re: The genetic evidence 386 Brian Patterson 05-Jul-17 12:45
Re: The genetic evidence 412 drrayeye 05-Jul-17 15:40
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 585 lostsheep 04-Jul-17 22:34


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