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Cited by 8Forensic and Genetic ResearchGenetic diversity and population structurePleistocene-Era Hominins and Archaeology

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Mitochondrial DNA Footprints from Western Eurasia in Modern Mongolia

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Abstract

Mongolia is located in a strategic position at the eastern edge of the Eurasian Steppe. Nomadic populations moved across this wide area for millennia before developing more sedentary communities, extended empires, and complex trading networks, which connected western Eurasia and eastern Asia until the late Medieval period. We provided a fine-grained portrait of the mitochondrial DNA (mtDNA) variation observed in present-day Mongolians and capable of revealing gene flows and other demographic processes that took place in Inner Asia, as well as in western Eurasia. The analyses of a novel dataset (N = 2,420) of mtDNAs highlighted a clear matrilineal differentiation within the country due to a mixture of haplotypes with eastern Asian (EAs) and western Eurasian (WEu) origins, which were differentially lost and preserved. In a wider genetic context, the prevalent EAs contribution, larger in eastern and central Mongolian regions, revealed continuous connections with neighboring Asian populations until recent times, as attested by the geographically restricted haplotype-sharing likely facilitated by the Genghis Khan’s so-called Pax Mongolica. The genetic history beyond the WEu haplogroups, notably detectable on both sides of Mongolia, was more difficult to explain. For this reason, we moved to the analysis of entire mitogenomes (N = 147). Although it was not completely possible to identify specific lineages that evolved in situ, two major changes in the effective (female) population size were reconstructed. The more recent one, which began during the late Pleistocene glacial period and became steeper in the early Holocene, was probably the outcome of demographic events connected to western Eurasia. The Neolithic growth could be easily explained by the diffusion of dairy pastoralism, as already proposed, while the late glacial increase indicates, for the first time, a genetic connection with western Eurasian refuges, as supported by the unusual high frequency and internal sub-structure in Mongolia of haplogroup H1, a well-known post-glacial marker in Europe. Bronze Age events, without a significant demographic impact, might explain the age of some mtDNA haplogroups. Finally, a diachronic comparison with available ancient mtDNAs made it possible to link six mitochondrial lineages of present-day Mongolians to the timeframe and geographic path of the Silk Route.

Overview

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TL;DR

This study analyzes mtDNA control-region sequences from 2,420 present-day Mongolians and 147 complete mitogenomes to characterize eastern and western Eurasian maternal ancestry and demographic history. It finds strong regional differentiation, with eastern Asian lineages predominating overall and western Eurasian lineages concentrated in western Mongolia, and links some western Eurasian lineages to post-glacial expansions and later Silk Route-era movements.

Key findings

  • Of 2,420 Mongolian mtDNAs, 1,987 (82.1%) belong to eastern Asian haplogroups, with C at 19.6% and D4 at 19.8%; western Eurasian haplogroups reach 21.7% in western Mongolia and decrease eastwards, with H the most represented western Eurasian haplogroup at 6.5%.
  • The 2,420 mtDNAs were classified into 413 lineages grouped into 18 macro-haplogroups; PCA separates the westernmost regions Bayan-Ölgii, Khovd, and Uvs due to JT, N2, R0, and X, while northern regions cluster together and southern regions are separated by eastern Asian lineages.
  • Complete mitogenomes (N = 147; 121 western Eurasian and 26 eastern Asian) revealed two novel sub-branches, HV13b1 and U5b1c2; haplogroup H1 was present at about 3%, three times higher than reported for Inner Asia, with sub-clades H1b, H1c, and H1j.
  • Bayesian analyses reconstructed two major increases in effective population size: one beginning in the late glacial period around 18–15 kya and a steeper early Holocene increase; some lineages coalesced around 5 kya during the Bronze Age without a significant demographic impact, and six sub-lineages matched the timeframe and geographic path of the Silk Route.

Methods

  • Collected 2,420 unrelated subjects with a Mongolian terminal maternal ancestor from 20 of 21 provinces using mouthwash; sequenced the mtDNA control region (2,133 full control-region haplotypes and 2,335 HVS1 haplotypes), classified haplogroups with PhyloTree build 17, and analyzed diversity, PCA, MDS, and haplotype sharing.
  • Sequenced 147 complete mitogenomes using the Ion Torrent Personal Genome Machine, built a most parsimonious tree and Bayesian BEAST analyses with an L3 outgroup, and compared results with 693 published ancient mitogenomes, including 25 excavated in Mongolia.

Limitations

  • Stated: provinces or macro-areas with fewer than 30 individuals were excluded from intra-Mongolia analyses; sample bias in the Khangai Mountains (N = 12) cannot be excluded; it was not completely possible to identify specific lineages that evolved in situ; and recent events younger than 3 kya cannot be accurately described through coalescent estimates because mitogenomes accumulate about one mutation in more than two thousand years on average.
  • Evident from the text: sampling is uneven across provinces, and 348 individuals lacked province information and were assigned to an “unspecified” group, which may affect regional comparisons; control-region-only analyses also have lower resolution than complete mitogenomes.

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Integrity signals

Registry

Crossref · 10.3389/fgene.2021.819337

Cites

58 of 58 references verified0 citation errors · 0 not checkable

Statistics

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Figures

FIGURE 1 The mtDNA variation within Mongolia based on 2,420 modern control-region sequences. (A) Map of genetic variability in each macro-area expressed as nucleotide diversity (Pi) and haplotype diversity (Hd); this analysis was restricted to 2,335 complete HVS1 sequences. (B) Pie charts of the distribution of mtDNA macro-haplogroups. (C) PCA plot representing the genetic landscape of Mongolia based on macro-haplogroup frequencies; the following groups were excluded: “Khangai Mountains”, “Near Ulaanbaatar” and “Not Specified”.
FIGURE 1 The mtDNA variation within Mongolia based on 2,420 modern control-region sequences. (A) Map of genetic variability in each macro-area expressed as nucleotide diversity (Pi) and haplotype diversity (Hd); this analysis was restricted to 2,335 complete HVS1 sequences. (B) Pie charts of the distribution of mtDNA macro-haplogroups. (C) PCA plot representing the genetic landscape of Mongolia based on macro-haplogroup frequencies; the following groups were excluded: “Khangai Mountains”, “Near Ulaanbaatar” and “Not Specified”.CC BY · PubMed Central
FIGURE 2 The mtDNA variation of Mongolia in the Eurasian context. Heatmaps based on haplotype sharing between Mongolia and other Eurasian populations are shown on the left. PCA plots based on macro-haplogroup frequencies are shown on the right. All lineages were included in the top panel, the differential contributions of WEu and EAs lineages were explored in the middle and lower panel, respectively.
FIGURE 2 The mtDNA variation of Mongolia in the Eurasian context. Heatmaps based on haplotype sharing between Mongolia and other Eurasian populations are shown on the left. PCA plots based on macro-haplogroup frequencies are shown on the right. All lineages were included in the top panel, the differential contributions of WEu and EAs lineages were explored in the middle and lower panel, respectively.CC BY · PubMed Central
FIGURE 3 The mtDNA variation in Mongolia based on 121 (new) modern and 25 (published) ancient complete mitogenomes belonging to WEu haplogroups. (A) Bayesian tree with internal nodes colored according to common ancestor (CA) average age estimates. (B) Age estimates and 95% high posterior densities. LGM timeframe is highlighted in grey, while the red shade indicates Bronze Age. (C) Bayesian Skyline Plot (BSP) displaying changes in the effective population size (Ne) through time and considering a generation time of 25 years.
FIGURE 3 The mtDNA variation in Mongolia based on 121 (new) modern and 25 (published) ancient complete mitogenomes belonging to WEu haplogroups. (A) Bayesian tree with internal nodes colored according to common ancestor (CA) average age estimates. (B) Age estimates and 95% high posterior densities. LGM timeframe is highlighted in grey, while the red shade indicates Bronze Age. (C) Bayesian Skyline Plot (BSP) displaying changes in the effective population size (Ne) through time and considering a generation time of 25 years.CC BY · PubMed Central
FIGURE 4 Ancient mitogenomes typical of western Eurasia that were identified among contemporary Mongolians and in ancient remains excavated in Mongolia as well as in other Eurasian regions to the west. A longitude axis is indicated at the bottom and in the geographic map on the top. Mongolia longitudes are shaded. A timeline of 1000 years BCE is reported in red and only those lineages identified in ancient individuals from Mongolia (or nearby regions) and dated after this timeline are reported; see Supplementary Figure S3 and Supplementary Table S5 for the entire dataset.
FIGURE 4 Ancient mitogenomes typical of western Eurasia that were identified among contemporary Mongolians and in ancient remains excavated in Mongolia as well as in other Eurasian regions to the west. A longitude axis is indicated at the bottom and in the geographic map on the top. Mongolia longitudes are shaded. A timeline of 1000 years BCE is reported in red and only those lineages identified in ancient individuals from Mongolia (or nearby regions) and dated after this timeline are reported; see Supplementary Figure S3 and Supplementary Table S5 for the entire dataset.CC BY · PubMed Central

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Citations

Cites

1 retracted

Research works printed but not linked: 2

  1. Kovalev, 2009, Discovery of New Cultures of the Bronze Age in Mongolia According to the Data Obtained by the International Central Asian Archaeological Expedition
  2. 2021, R: A Language and Environment for Statistical Computing

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Metadata

Authors
Cardinali, I., Bodner, M., Capodiferro, M. R., Amory, C., Rambaldi Migliore, N., Gomez, E. J., Myagmar, E., Dashzeveg, T., Carano, F., Woodward, S. R., Parson, W., Perego, U. A., Lancioni, H., & Achilli, A.
Affiliations
  • University of Perugia (IT)
  • Innsbruck Medical University (AT)
  • University of Pavia (IT)
  • National University of Mongolia (MN)
  • University of Bologna (IT)
  • Pennsylvania State University (US)
  • Southeastern Community College - Iowa (US)
Corresponding author
  • Cardinali, Irene
  • Achilli, Alessandro
Venue
Frontiers in Genetics
Published
2022-01-06
Volume
12
Pages
819337-819337
ISSN
1664-8021 (ISSN-L)
OpenAlex
W4206652868
Cited by
8
References
58
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2023: 3 · 2022: 2
FWCI
0.86
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Genetics (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Geographic Society
  • Ministero dell’Istruzione, dell’Università e della Ricerca
  • Dipartimenti di Eccellenza
  • Università degli Studi di Pavia
  • Ministry of Education, Culture, Sports, Science and Technology
  • Russian Foundation for Basic Research
  • National University of Mongolia
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Forensic and Genetic Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic diversity and population structure
  • Social Sciences › Anthropology › Pleistocene-Era Hominins and Archaeology
Keywords
mitochondrial DNA, Inner Asia, Eurasian steppe, gene flow, haplotype sharing, Pax Mongolica, Genghis Khan, effective population size, Bronze Age, Silk Road, ancient DNA, nomadic populations

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