Paper.
I have discussed this paper before (see here), interpreting the genetic-cultural correlations with respect to long-term pan-European biopolitics. I consider that interpretation very important, and the main reason why the paper is important (from my perspective). I would suggest re-reading those Western Destiny posts.
However, there are some more minor points of interest with respect to the paper, which I will briefly examine here.
Excerpts, emphasis added, plus my comments:
Abstract
The Levant is a region in the Near East with an impressive record of continuous human existence and major cultural developments since the Paleolithic period. Genetic and archeological studies present solid evidence placing the Middle East and the Arabian Peninsula as the first stepping-stone outside Africa. There is, however, little understanding of demographic changes in the Middle East, particularly the Levant, after the first Out-of-Africa expansion and how the Levantine peoples relate genetically to each other and to their neighbors. In this study we analyze more than 500,000 genome-wide SNPs in 1,341 new samples from the Levant and compare them to samples from 48 populations worldwide. Our results show recent genetic stratifications in the Levant are driven by the religious affiliations of the populations within the region. Cultural changes within the last two millennia appear to have facilitated/maintained admixture between culturally similar populations from the Levant, Arabian Peninsula, and Africa. The same cultural changes seem to have resulted in genetic isolation of other groups by limiting admixture with culturally different neighboring populations. Consequently, Levant populations today fall into two main groups: one sharing more genetic characteristics with modern-day Europeans and Central Asians, and the other with closer genetic affinities to other Middle Easterners and Africans. Finally, we identify a putative Levantine ancestral component that diverged from other Middle Easterners ∼23,700–15,500 years ago during the last glacial period, and diverged from Europeans ∼15,900–9,100 years ago between the last glacial warming and the start of the Neolithic.
Again, culture, relating to endogamy vs. admixture, can significantly influence a people’s genetic makeup and their relative genetic kinship (and, hence, ethnic genetic interests) with other populations.
We show that religious affiliation had a strong impact on the genomes of the Levantines. In particular, conversion of the region’s populations to Islam appears to have introduced major rearrangements in populations’ relations through admixture with culturally similar but geographically remote populations, leading to genetic similarities between remarkably distant populations like Jordanians, Moroccans, and Yemenis. Conversely, other populations, like Christians and Druze, became genetically isolated in the new cultural environment.
Thus, the main point of interest.
We reconstructed the genetic structure of the Levantines and found that a pre-Islamic expansion Levant was more genetically similar to Europeans than to Middle Easterners.
This is an interesting secondary point, and one that must be considered when evaluating Levantine populations in the Classical World; for example, in the Roman Empire (and as immigrants to Rome itself). The Levantines of that time were genetically more similar to Europeans than are Middle Easterners of today. It is also reasonable to consider pre-Turkish Anatolians to be more similar to Europeans than Turks of today.
Genome-wide surveys in the Levant are limited and most of our knowledge comes from studies assessing the relationship of Diaspora Jewish groups to a Levantine/Middle Eastern origin [6], [7]. These studies show that the Jews form a distinctive cluster in the Middle East…
Note – Middle East.
In this study we analyze newly-generated genome-wide data from Lebanon in addition to individuals from 48 published global populations…The results suggest endogamous practices among the religious groups of Lebanon within a small geographical area not exceeding 10,452 km2 (half the size of the state of New Jersey or one third the size of Belgium…
Culture can lead to endogamy, with consequent genetic effects.
…an unsupervised…
Unsupervised = more objective,
…clustering method (ADMIXTURE) [10] was applied to the Lebanese dataset (Figure S1A). At K = 2, which showed the lowest cross-validation error (Figure S1B), Christians present one major component (∼82% on average per individual), which is also found in Druze and in lower frequencies in Muslims; in contrast, the second component is almost exclusive to Muslims with a lower representation in Druze. At K = 3 and K = 4, new components most abundant in Lebanese Muslims are shown, probably reflecting recent admixture after the split from the other Lebanese groups.
OK.
Ashkenazi Jews are drawn towards the Caucasus and Eastern Europe, reflecting historical admixture events with Europeans, while Sephardi Jews cluster tightly with the Levantine groups. These results are consistent with previous studies reporting higher European genome-wide admixture in Ashkenazi Jews compared with other Jews…
This is exactly what I’ve been talking about with Eurasian PCA and why some Ashkenazi Jews begin to overlap with Southern Europeans; it is because of the Eastern European admixture in those Jews.
The population tree (Figure 3A) splits Levantine populations in two branches: one leading to Europeans and Central Asians that includes Lebanese, Armenians, Cypriots, Druze and Jews, as well as Turks, Iranians and Caucasian populations; and a second branch composed of Palestinians, Jordanians, Syrians, as well as North Africans, Ethiopians, Saudis, and Bedouins. The tree shows a correlation between religion and the population structures in the Levant: all Jews (Sephardi and Ashkenazi) cluster in one branch; Druze from Mount Lebanon and Druze from Mount Carmel are depicted on a private branch; and Lebanese Christians form a private branch with the Christian populations of Armenia and Cyprus placing the Lebanese Muslims as an outer group. The predominantly Muslim populations of Syrians, Palestinians and Jordanians cluster on branches with other Muslim populations as distant as Morocco and Yemen.
Once again, we see how cultural affiliation, in this case religion, influences genetic affiliation.
ADMIXTURE identifies at K = 10 an ancestral component (light green) with a geographically restricted distribution representing ∼50% of the individual component in Ethiopians, Yemenis, Saudis, and Bedouins, decreasing towards the Levant, with higher frequency (∼25%) in Syrians, Jordanians, and Palestinians, compared with other Levantines (4%–20%). The geographical distribution pattern of this component (Figure 4A, 4B) correlates with the pattern of the Islamic expansion, but its presence in Lebanese Christians, Sephardi and Ashkenazi Jews, Cypriots and Armenians might suggest that its spread to the Levant could also represent an earlier event. Besides this component, the most frequent ancestral component (shown in dark blue) in the Levantines (42–68%) is also present, at lower frequencies, in Europe and Central Asia (Figure 4A, 4C). We found that this Levantine component is closer to the European component (dark green) (FST = 0.035) than to the Arabian Peninsula/East Africa component (light green) (FST = 0.046). Our estimates show that the Levantine and the Arabian Peninsula/East African components diverged ∼23,700-15,500 y.a., while the Levantine and European components diverged ∼15,900-9,100 y.a.
All minor points of interest.
Our time estimate of divergence between the Levantine and European components (∼15,900-9,100 y.a) overlaps with the transition to agriculture in the Levant ∼11,000 y.a but is also slightly earlier than the proposed expansion to Europe starting at ∼9,000 y.a. [23]–[25]. In agreement with this, a recent study of complete mtDNA sequences also proposed earlier expansion dates (19,000-12,000 y.a) of certain female lineages from the Near East to Europe [26]. These results suggest that population migration to Europe from the Near East could have started after the LGM warming and continued until the Neolithic.
Historical genetic points of some interest.
In addition, these results show that the modern European genetic component is more recent than would be expected from a component that developed from the initial peopling of Europe in the Upper Paleolithic ∼40,000 y.a.
The “movement” weeps bitter Ice Age tears.
…recent cultural developments, such as the founding and spread of major world religions, have had a strong impact on population stratifications in the Levant.
Thus, as the aforementioned Western Destiny posts make clear, raciocultural-civilizational political constructs (e.g., an Imperium restricted solely to indigenous Europeans) can have strong genetic population effects leading to greater pan-European cohesion and greater distinctiveness compared to other groups.
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