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. 2015 Aug 21;349(6250):aab3884.
doi: 10.1126/science.aab3884. Epub 2015 Jul 21.

POPULATION GENETICS. Genomic evidence for the Pleistocene and recent population history of Native Americans

Maanasa Raghavan #  1 Matthias Steinrücken #  2   3   4 Kelley Harris #  5 Stephan Schiffels #  6 Simon Rasmussen #  7 Michael DeGiorgio #  8 Anders Albrechtsen #  9 Cristina Valdiosera #  1   10 María C Ávila-Arcos #  1   11 Anna-Sapfo Malaspinas #  1 Anders Eriksson  12   13 Ida Moltke  9 Mait Metspalu  14   15 Julian R Homburger  11 Jeff Wall  16 Omar E Cornejo  17 J Víctor Moreno-Mayar  1 Thorfinn S Korneliussen  1 Tracey Pierre  1 Morten Rasmussen  1   11 Paula F Campos  1   18 Peter de Barros Damgaard  1 Morten E Allentoft  1 John Lindo  19 Ene Metspalu  14   15 Ricardo Rodríguez-Varela  20 Josefina Mansilla  21 Celeste Henrickson  22 Andaine Seguin-Orlando  1 Helena Malmström  23 Thomas Stafford Jr  1   24 Suyash S Shringarpure  11 Andrés Moreno-Estrada  11   25 Monika Karmin  14   15 Kristiina Tambets  14 Anders Bergström  6 Yali Xue  6 Vera Warmuth  26   27 Andrew D Friend  28 Joy Singarayer  29 Paul Valdes  30 Francois Balloux  26 Ilán Leboreiro  21 Jose Luis Vera  31 Hector Rangel-Villalobos  32 Davide Pettener  33 Donata Luiselli  33 Loren G Davis  34 Evelyne Heyer  35 Christoph P E Zollikofer  36 Marcia S Ponce de León  36 Colin I Smith  10 Vaughan Grimes  37   38 Kelly-Anne Pike  37 Michael Deal  37 Benjamin T Fuller  39 Bernardo Arriaza  40 Vivien Standen  41 Maria F Luz  42 Francois Ricaut  43 Niede Guidon  42 Ludmila Osipova  44   45 Mikhail I Voevoda  44   46   47 Olga L Posukh  44   45 Oleg Balanovsky  48   49 Maria Lavryashina  50 Yuri Bogunov  48 Elza Khusnutdinova  51   52 Marina Gubina  42 Elena Balanovska  49 Sardana Fedorova  53   54 Sergey Litvinov  14   51 Boris Malyarchuk  55 Miroslava Derenko  55 M J Mosher  56 David Archer  57 Jerome Cybulski  58   59   60 Barbara Petzelt  61 Joycelynn Mitchell  61 Rosita Worl  62 Paul J Norman  63 Peter Parham  63 Brian M Kemp  17   64 Toomas Kivisild  14   65 Chris Tyler-Smith  6 Manjinder S Sandhu  6   66 Michael Crawford  67 Richard Villems  14   15 David Glenn Smith  68 Michael R Waters  69   70   71 Ted Goebel  69 John R Johnson  72 Ripan S Malhi  19   73 Mattias Jakobsson  23 David J Meltzer  1   74 Andrea Manica  12 Richard Durbin  6 Carlos D Bustamante  11 Yun S Song  2   3   75 Rasmus Nielsen  75 Eske Willerslev  1
Affiliations

POPULATION GENETICS. Genomic evidence for the Pleistocene and recent population history of Native Americans

Maanasa Raghavan et al. Science. .

Abstract

How and when the Americas were populated remains contentious. Using ancient and modern genome-wide data, we found that the ancestors of all present-day Native Americans, including Athabascans and Amerindians, entered the Americas as a single migration wave from Siberia no earlier than 23 thousand years ago (ka) and after no more than an 8000-year isolation period in Beringia. After their arrival to the Americas, ancestral Native Americans diversified into two basal genetic branches around 13 ka, one that is now dispersed across North and South America and the other restricted to North America. Subsequent gene flow resulted in some Native Americans sharing ancestry with present-day East Asians (including Siberians) and, more distantly, Australo-Melanesians. Putative "Paleoamerican" relict populations, including the historical Mexican Pericúes and South American Fuego-Patagonians, are not directly related to modern Australo-Melanesians as suggested by the Paleoamerican Model.

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Figures

Fig. 1
Fig. 1. Origins and population history of Native Americans
(A) Our results show that the ancestors of all present-day Native Americans, including Amerindians and Athabascans, derived from a single migration wave into the Americas (purple), separate from the Inuit (green). This migration from East Asia occurred no later than 23 KYA and is in agreement with archaeological evidence from sites such as Monte Verde (50). A split between the northern and southern branches of Native Americans occurred ca. 13 KYA, with the former comprising Athabascans and northern Amerindians and the latter consisting of Amerindians in northern North America and Central and South America including the Anzick-1 individual (5). There is an admixture signal between Inuit and Athabascans and some northern Amerindians (yellow line); however, the gene flow direction is unresolved due to the complexity of the admixture events (28). Additionally, we see a weak signal related to Australo-Melanesians in some Native Americans, which may have been mediated through East Asians and Aleutian Islanders (yellow arrows). Also shown is the Mal’ta gene flow into Native American ancestors some 23 KYA (yellow arrow) (4). It is currently not possible for us to ascertain the exact geographical locations of the depicted events; hence, the positioning of the arrows should not be considered a reflection of these. B. Admixture plot created on the basis of TreeMix results (fig. S5) shows that all Native Americans form a clade, separate from the Inuit, with gene flow between some Native Americans and the North American Arctic. The number of genome-sequenced individuals included in the analysis is shown in brackets.
Fig. 2
Fig. 2. Divergence estimates between Native Americans and Siberian Koryak
(A) The demographic model used allows for continuous gene flow between populations 1 and 2, starting from the time TDIV of divergence and ending at TM. The backward probability of migration per individual per generation is denoted by m. The bottleneck at TB captures the out-of-Africa event. (B) The red and black solid curves depict empirical distributions of IBS tracts shared between Karitiana-Koryak and Athabascan-Koryak, respectively. The orange, pink, dashed blue and dashed green curves depict IBS tracts shared between the two population pairs, simulated under two demographic models based on results from diCal2.0. Overall, for Karitiana-Koryak and Athabascan-Koryak, the migration scenarios (orange and pink, respectively) match the empirical curves (red and black, respectively) better than the clean split scenarios (dashed blue and dashed green, respectively), with more long IBS tracts showing evidence of recent common ancestry between Koryaks and Native Americans. (C and D) Relative cross coalescence rates (CCR) for the Karitiana-Koryak and Athabascan-Koryak divergence (red), respectively, including data simulated under the two demographic models in panel B. In both cases, the model with gene flow (orange) fits the data (red) better than the clean split model (blue). The migration model explains a broader CCR tail in the case of Karitiana-Koryak and the relatively late onset of the CCR decay for Athabascan-Koryak.
Fig. 3
Fig. 3. Testing migrations into the Americas using a climate-informed model
Estimates of difference in genetic divergence between Amerindians (from southern North America and Central and South America) or Koryak versus Athabascan and Greenlandic Inuit and the ancient Saqqaq and Anzick-1 genomes (black vertical lines), compared to posterior probability distribution predicted from a climate-informed spatial genetic model reconstructing a single wave into the Americas (curves, the colored part represents the 95% credibility interval). ΔT for population X is defined as T(X,Koryak)-T(X,Central and South Amerindians) (28). Both Anzick-1 and the Athabascans were part of the same wave into the Americas to which other Amerindian populations from southern North America and Central and South America belonged, while the Inuit and Saqqaq are the descendants of different waves (observed values outside the 95% credibility interval).
Fig. 4
Fig. 4. Diversification within the Americas
SNP chip genotype data-based outgroup f3 statistics (47) of the form f3(X, Ancient; Yoruba) were used to estimate the shared ancestry between ancient samples from the Americas and a large panel of worldwide present-day populations (X), including Athabascan and Amerindian groups from North America (table S3), some of which were masked for non-Native ancestry prior to the analysis (28). The outgroup f3 statistics are depicted as heat maps with the sampling location of the ancient sample marked by the dotted lines, and corresponding ranked plots with error bars are shown in fig. S14. BP refers to time before present. We find the Anzick-1 sample to share most ancestry with the ‘southern’ branch of Native Americans when using multiple northern Native Americans sequenced in this study, consistent with (5). The seven Holocene aged samples share most ancestry with Native Americans, with a general tendency to be genetically closer to present-day Native American populations from the same geographical region.
Fig. 5
Fig. 5. The Paleoamerican model
(A) Principal Component Analysis plot of 19 ancient samples combined with a worldwide reference panel, including 1,823 individuals from (6). Our samples plot exclusively with American samples. For plots with other reference panels consisting of Native American populations, see fig. S32. (B) Population structure in the ancient Pericú, Mexican mummy and Fuego-Patagonian individuals from this study. Ancestry proportions are shown when assuming six ancestral populations (K = 6). The top bar shows the ancestry proportions of the 19 ancient individuals, Anzick-1 (5), and two present-day Native American genomes from this study (Huichol and Aymara). The plot at the bottom illustrates the ancestry proportions for 1,823 individuals from (6). Our samples show primarily Native American (ivory, >92%) and Siberian (red, ca. 5%) ancestry. For the plot with K =13, see fig. S33.

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