Angela
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They do compare the modern samples to ancient samples, which is important.
See:
Marc Haber et al
https://www.biorxiv.org/content/biorxiv/early/2019/08/29/749341.full.pdf
"Abstract
We report high-coverage whole-genome sequencing data from 46 Yemeni individuals as well asgenome-wide genotyping data from 169 Yemenis from diverse locations. We use this datasetto definethe genetic diversity in Yemen and how it relates to people elsewhere in the Near East. Yemen is avast region with substantial cultural and geographic diversity, but we found little genetic structurecorrelating with geography among the Yemenis – probably reflecting continuous movement of peoplebetween the regions. African ancestry from admixture in the past 800 years is widespread in Yemenand is the main contributor to the country’s limited genetic structure, with some individuals inHudayda and Hadramout having up to 20% of their genetic ancestry from Africa. In contrast,individuals from Maarib appear to have been genetically isolated from the African gene flow and thushave genomes likely to reflect Yemen’s ancestry before the admixture. This ancestry was comparableto the ancestry present during the Bronze Age in the distant Northern regions of the Near East. Afterthe Bronze Age, the South and North of the Near East therefore followed different genetic trajectories:in the North the Levantines admixed with a Eurasian population carrying steppe ancestry whoseimpact never reached as far south as the Yemen, where people instead admixed with Africansleadingto the genetic structure observed in the Near East today."
So, they have found it too.
"1) The Africancline, which appears to be a major contributor to genetic diversity in Yemen and 2) The Eurasian cline,towards which the Northern Near Easterners appear shifted compared with the Yemenis. TheNorthern Near Easterners are themselves structured on the African cline with Palestinians, Jordanians,Syrians, and Lebanese Muslims having more African ancestry than Assyrians, Jews, Druze andLebanese Christians (Figure 4) confirming our previous observation."
"We found two significant admixtureevents in the Lebanese Muslims; the first occurred around 600BCE-500CE (Z=3.5) and the secondoccurred around 1580CE-1750CE (Z=3.4), confirming our previous results on the date of admixture inNorth of the Near East.19 In contrast, we detect one significant admixture event in Yemen occurring1190CE-1290CE (Z=14.6) and thus these results suggest that the shifts of the North and South of theNear East along the African cline could arise from independent events."
"(Figure 8) confirm the observation from the PCA showing that most Yemenis have some Africanancestry which is maximized in Hudayda and Hadramout, with the later having in addition some EastAsian ancestry, while the Maarib individuals appear to be the least admixed of the populations testedin Yemen. The African and Asian ancestry in Yemen can also be observed in the present Y-chromosomeand mtDNA lineages (Figure 9 and Table 3) which are enriched with Y-haplogroups A, E, and R1a andmtDNA haplgroups L and M, respectively."
"We confirm the f4-statisticsresults by modelling the modern and ancient Near Easterners using qpGraph from the ADMIXTOOLSpackage and show that our data support a model where the North and South of the Near East splitfrom a population related to the Bronze Age population which inhabited the North of the Near East,but with the South regions having an excess of Epipaleolithic hunter-gatherer ancestry (Figure 11).After the split, the Northern regions of the Near East received gene flow from a Eurasian population4;19 which neverreached the South, where people instead admixed with Africansresulting in the geneticstructure we observe in the Near East today (Figure 11)."
Figure 9 shows a maximum likelihood true of y lineages from modern Yemen.
Figure 11
[/IMG]
See:
Marc Haber et al
https://www.biorxiv.org/content/biorxiv/early/2019/08/29/749341.full.pdf
"Abstract
We report high-coverage whole-genome sequencing data from 46 Yemeni individuals as well asgenome-wide genotyping data from 169 Yemenis from diverse locations. We use this datasetto definethe genetic diversity in Yemen and how it relates to people elsewhere in the Near East. Yemen is avast region with substantial cultural and geographic diversity, but we found little genetic structurecorrelating with geography among the Yemenis – probably reflecting continuous movement of peoplebetween the regions. African ancestry from admixture in the past 800 years is widespread in Yemenand is the main contributor to the country’s limited genetic structure, with some individuals inHudayda and Hadramout having up to 20% of their genetic ancestry from Africa. In contrast,individuals from Maarib appear to have been genetically isolated from the African gene flow and thushave genomes likely to reflect Yemen’s ancestry before the admixture. This ancestry was comparableto the ancestry present during the Bronze Age in the distant Northern regions of the Near East. Afterthe Bronze Age, the South and North of the Near East therefore followed different genetic trajectories:in the North the Levantines admixed with a Eurasian population carrying steppe ancestry whoseimpact never reached as far south as the Yemen, where people instead admixed with Africansleadingto the genetic structure observed in the Near East today."
So, they have found it too.
"1) The Africancline, which appears to be a major contributor to genetic diversity in Yemen and 2) The Eurasian cline,towards which the Northern Near Easterners appear shifted compared with the Yemenis. TheNorthern Near Easterners are themselves structured on the African cline with Palestinians, Jordanians,Syrians, and Lebanese Muslims having more African ancestry than Assyrians, Jews, Druze andLebanese Christians (Figure 4) confirming our previous observation."
"We found two significant admixtureevents in the Lebanese Muslims; the first occurred around 600BCE-500CE (Z=3.5) and the secondoccurred around 1580CE-1750CE (Z=3.4), confirming our previous results on the date of admixture inNorth of the Near East.19 In contrast, we detect one significant admixture event in Yemen occurring1190CE-1290CE (Z=14.6) and thus these results suggest that the shifts of the North and South of theNear East along the African cline could arise from independent events."
"(Figure 8) confirm the observation from the PCA showing that most Yemenis have some Africanancestry which is maximized in Hudayda and Hadramout, with the later having in addition some EastAsian ancestry, while the Maarib individuals appear to be the least admixed of the populations testedin Yemen. The African and Asian ancestry in Yemen can also be observed in the present Y-chromosomeand mtDNA lineages (Figure 9 and Table 3) which are enriched with Y-haplogroups A, E, and R1a andmtDNA haplgroups L and M, respectively."
"We confirm the f4-statisticsresults by modelling the modern and ancient Near Easterners using qpGraph from the ADMIXTOOLSpackage and show that our data support a model where the North and South of the Near East splitfrom a population related to the Bronze Age population which inhabited the North of the Near East,but with the South regions having an excess of Epipaleolithic hunter-gatherer ancestry (Figure 11).After the split, the Northern regions of the Near East received gene flow from a Eurasian population4;19 which neverreached the South, where people instead admixed with Africansresulting in the geneticstructure we observe in the Near East today (Figure 11)."
Figure 9 shows a maximum likelihood true of y lineages from modern Yemen.
Figure 11