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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 2484 Thanos5150 02-Jun-17 15:42
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 690 Laird Scranton 02-Jun-17 15:53
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 614 Thanos5150 02-Jun-17 18:08
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 643 Laird Scranton 02-Jun-17 20:08
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 654 Thanos5150 02-Jun-17 23:19
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 625 Laird Scranton 03-Jun-17 03:56
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 581 Notinham 03-Jun-17 05:04
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 554 Thanos5150 03-Jun-17 14:49
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 546 Notinham 03-Jun-17 16:00
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 800 Eddie Larry 04-Jun-17 00:38
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 384 Heliograph 29-Jun-17 11:06
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 471 Eddie Larry 29-Jun-17 14:16
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 477 Thanos5150 29-Jun-17 16:33
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 614 Notinham 02-Jun-17 16:06
Ancient Egyptians were closely related to people who lived along the eastern Mediterranean 605 HH Holmes 26-Jun-17 19:38
Mod Note > Duplicate Topic Merged 472 Dr. Troglodyte 27-Jun-17 12:39
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 502 Heliograph 29-Jun-17 10:53
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 507 MDaines 29-Jun-17 14:06
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 560 Thanos5150 29-Jun-17 16:25
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 503 MDaines 30-Jun-17 10:56
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 547 Thanos5150 30-Jun-17 13:56
Egyptian Style Head? 496 Dr. Troglodyte 30-Jun-17 14:30
Re: Egyptian Style Head? 547 Eddie Larry 30-Jun-17 14:36
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 480 MDaines 01-Jul-17 07:53
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 557 Thanos5150 01-Jul-17 17:28
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 471 Eddie Larry 01-Jul-17 18:17
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 579 Thanos5150 01-Jul-17 18:38
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 571 MDaines 01-Jul-17 19:58
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 579 Thanos5150 03-Jul-17 14:05
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 490 Thanos5150 29-Jun-17 16:39
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 406 R Avry Wilson 29-Jun-17 17:10
Cuneiform vs Hieroglyph 579 Dr. Troglodyte 29-Jun-17 18:22
Re: Cuneiform vs Hieroglyph 490 Thanos5150 01-Jul-17 20:19
Re: Cuneiform vs Hieroglyph 534 Thanos5150 08-Jul-17 16:12
Re: Cuneiform vs Hieroglyph 285 Eddie Larry 08-Jul-17 18:04
Re: Cuneiform vs Hieroglyph 438 Thanos5150 08-Jul-17 19:30
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 387 Thanos5150 30-Jun-17 20:09
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 428 R Avry Wilson 01-Jul-17 01:55
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 428 Thanos5150 01-Jul-17 03:15
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 543 R Avry Wilson 02-Jul-17 22:02
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 445 MDaines 03-Jul-17 08:04
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 480 Thanos5150 03-Jul-17 14:10
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 420 Thanos5150 03-Jul-17 16:58
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 512 R Avry Wilson 03-Jul-17 22:56
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 356 Thanos5150 04-Jul-17 21:55
The scientific study 370 drrayeye 04-Jul-17 11:09
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 501 Notinham 03-Jul-17 14:17
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 509 Brian Patterson 04-Jul-17 17:58
The genetic evidence 563 drrayeye 04-Jul-17 19:48
Re: The genetic evidence 396 Brian Patterson 05-Jul-17 12:45
Re: The genetic evidence 424 drrayeye 05-Jul-17 15:40
Re: DNA Study Reveals AE Closely Related to Levant and Anatolian Populations 600 lostsheep 04-Jul-17 22:34


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