Yamna the likely source of modern horse domesticates; the closest lineage, from East Bell Beakers

Open access Tracking Five Millennia of Horse Management with Extensive Ancient Genome Time Series, by Fages et al. Cell (2019).

Interesting excerpts (emphasis mine):

The earliest archaeological evidence of horse milking, harnessing, and corralling is found in the ∼5,500-year-old Botai culture of Central Asian steppes (Gaunitz et al., 2018, Outram et al., 2009; see Kosintsev and Kuznetsov, 2013 for discussion). Botai-like horses are, however, not the direct ancestors of modern domesticates but of Przewalski’s horses (Gaunitz et al., 2018). The genetic origin of modern domesticates thus remains contentious, with suggested candidates in the Pontic-Caspian steppes (Anthony, 2007), Anatolia (Arbuckle, 2012, Benecke, 2006), and Iberia (Uerpmann, 1990, Warmuth et al., 2011). Irrespective of the origins of domestication, the horse genome is known to have been reshaped significantly within the last ∼2,300 years (Librado et al., 2017, Wallner et al., 2017, Wutke et al., 2018). However, when and in which context(s) such changes occurred remains largely unknown.

To clarify the origins of domestic horses and reveal their subsequent transformation by past equestrian civilizations, we generated DNA data from 278 equine subfossils with ages mostly spanning the last six millennia (n = 265, 95%) (Figures 1A and 1B; Table S1; STAR Methods). Endogenous DNA content was compatible with economical sequencing of 87 new horse genomes to an average depth-of-coverage of 1.0- to 9.3-fold (median = 3.3-fold; Table S2). This more than doubles the number of ancient horse genomes hitherto characterized. With a total of 129 ancient genomes, 30 modern genomes, and new genome-scale data from 132 ancient individuals (0.01- to 0.9-fold, median = 0.08-fold), our dataset represents the largest genome-scale time series published for a non-human organism (Tables S2, S3, and S4; STAR Methods).

genetic-affinities-horse-domesticates-pca
Genetic Affinities.
(A)
Principal Component Analysis (PCA) of 159 ancient and modern horse genomes showing at least 1-fold average depth-of-coverage. The overall genetic structure is shown for the first three principal components, which summarize 11.6%, 10.4% and 8.2% of the total genetic variation, respectively. The two specimens MerzlyYar_Rus45_23789 and Dunaujvaros_Duk2_4077 discussed in the main text are highlighted. See also Figure S7 and Table S5 for further information.
(B) Visualization of the genetic affinities among individuals, as revealed by the struct-f4 algorithm and 878,475 f4 permutations. The f4 calculation was conditioned on nucleotide transversions present in all groups, with samples were grouped as in TreeMix analyses (Figure 3). In contrast to PCA, f4 permutations measure genetic drift along internal branches. They are thus more likely to reveal ancient population substructure.

Discovering Two Divergent and Extinct Lineages of Horses

Domestic and Przewalski’s horses are the only two extant horse lineages (Der Sarkissian et al., 2015). Another lineage was genetically identified from three bones dated to ∼43,000–5,000 years ago (Librado et al., 2015, Schubert et al., 2014a). It showed morphological affinities to an extinct horse species described as Equus lenensis (Boeskorov et al., 2018). We now find that this extinct lineage also extended to Southern Siberia, following the principal component analysis (PCA), phylogenetic, and f3-outgroup clustering of an ∼24,000-year-old specimen from the Tuva Republic within this group (Figures 3, 5A and S7A). This new specimen (MerzlyYar_Rus45_23789) carries an extremely divergent mtDNA only found in the New Siberian Islands some ∼33,200 years ago (Orlando et al., 2013) (Figure 6A; STAR Methods) and absent from the three bones previously sequenced. This suggests that a divergent ghost lineage of horses contributed to the genetic ancestry of MerzlyYar_Rus45_23789. However, both the timing and location of the genetic contact between E. lenensis and this ghost lineage remain unknown.

modern-horse-domesticates-przewalski-hungary
Population modeling of the demographic changes and admixture events in extant and extinct horse lineages. The two models presented show best fitting to the observed multi-dimensional SFS in momi2. The width of each branch scales with effective size variation, while colored dashed lines indicate admixture proportions and their directionality. The robustness of each model was inferred from 100 bootstrap pseudo-replicates. Time is shown in a linear scale up to 120,000 years ago and in a logarithmic scale above.

Modeling Demography and Admixture of Extinct and Extant Horse Lineages

Phylogenetic reconstructions without gene flow indicated that IBE differentiated prior to the divergence between DOM2 and Przewalski’s horses (Figure 3; STAR Methods). However, allowing for one migration edge in TreeMix suggested closer affinities with one single Hungarian DOM2 specimen from the 3rd mill. BCE (Dunaujvaros_Duk2_4077), with extensive genetic contribution (38.6%) from the branch ancestral to all horses (Figure S7B).This, and the extremely divergent IBE Y chromosome (Figure 6B), suggest that a divergent but yet unidentified ghost population could have contributed to the IBE genetic makeup.

Rejecting Iberian Contribution to Modern Domesticates

The genome sequences of four ∼4,800- to 3,900-year-old IBE specimens characterized here allowed us to clarify ongoing debates about the possible contribution of Iberia to horse domestication (Benecke, 2006, Uerpmann, 1990, Warmuth et al., 2011). Calculating the so-called fG ratio (Martin et al., 2015) provided a minimal boundary for the IBE contribution to DOM2 members (Cahill et al., 2013) (Figure 7A). The maximum of such estimate was found in the Hungarian Dunaujvaros_Duk2_4077 specimen (∼11.7%–12.2%), consistent with its TreeMix clustering with IBE when allowing for one migration edge (Figure S7B). This specimen was previously suggested to share ancestry with a yet-unidentified population (Gaunitz et al., 2018). Calculation of f4-statistics indicates that this population is not related to E. lenensis but to IBE (Figure 7B; STAR Methods). Therefore, IBE or horses closely related to IBE, contributed ancestry to animals found at an Early Bronze Age trade center in Hungary from the late 3rd mill. BCE. This could indicate that there was long-distance exchange of horses during the Bell Beaker phenomenon (Olalde et al., 2018). The fG minimal boundary for the IBE contribution into an Iron Age Spanish horse (ElsVilars_UE4618_2672) was still important (~9.6%–10.1%), suggesting that an IBE genetic influence persisted in Iberia until at least the 7th century BCE in a domestic context. However, fG estimates were more limited for almost all ancient and modern horses investigated (median = ~4.9%–5.4%; Figure 7A).

horse-lineages-domesticates-przewalski-dom2-botai
TreeMix Phylogenetic Relationships. The tree topology was inferred using a total of ∼16.8 million transversion sites and disregarding migration. The name of each sample provides the archaeological site as a prefix, and the age of the specimen as a suffix (years ago). Name suffixes (E) and (A) denote European and Asian ancient horses, respectively. See Table S5 for dataset information. Image modified to include the likely ancestor of domesticates in a red circle, represented by Yamna, the most likely direct ancestor of the Dunaujvarus specimen.

Iron Age horses

Y chromosome nucleotide diversity (π) decreased steadily in both continents during the last ∼2,000 years but dropped to present-day levels only after 850–1,350 CE (Figures 2B and S2E; STAR Methods). This is consistent with the dominance of an ∼1,000- to 700-year-old oriental haplogroup in most modern studs (Felkel et al., 2018, Wallner et al., 2017). Our data also indicate that the growing influence of specific stallion lines post-Renaissance (Wallner et al., 2017) was responsible for as much as a 3.8- to 10.0-fold drop in Y chromosome diversity.

We then calculated Y chromosome π estimates within past cultures represented by a minimum of three males to clarify the historical contexts that most impacted Y chromosome diversity. This confirmed the temporal trajectory observed above as Byzantine horses (287–861 CE) and horses from the Great Mongolian Empire (1,206–1,368 CE) showed limited yet larger-than-modern diversity. Bronze Age Deer Stone horses from Mongolia, medieval Aukštaičiai horses from Lithuania (C9th–C10th [ninth through the tenth centuries of the Common Era]), and Iron Age Pazyryk Scythian horses showed similar diversity levels (0.000256–0.000267) (Figure 2A). However, diversity was larger in La Tène, Roman, and Gallo-Roman horses, where Y-to-autosomal π ratios were close to 0.25. This contrasts to modern horses, where marked selection of specific patrilines drives Y-to-autosomal π ratios substantially below 0.25 (0.0193–0.0396) (Figure 2A). The close-to-0.25 Y-to-autosomal π ratios found in La Tène, Roman, and Gallo-Roman horses suggest breeding strategies involving an even reproductive success among stallions or equally biased reproductive success in both sexes (Wilson Sayres et al., 2014).

Lineage is used in this paper, as in many others in genetics, as defined by a specific ancestry. I keep that nomenclature below. It should not be confused with the “lineages” or “lines” referring to Y-chromosome (or mtDNA) haplogroups.

Supporting the “archaic” nature of the Hungarian BBC horses expanding from the Pontic-Caspian steppes are:

  • Among Y-chromosome lines, the common group formed by Botai-Borly4 (closely related to DOM2), Scythian horses from Aldy Bel (Arzhani), Iron Age horses from Estonia (Ridala), horses from the Xiongnu culture (Uushgiin Uvur), and Roman horses from Autricum (Chartres).
  • Among mtDNA lines, the common group formed by Botai samples, LebyazhinkaIV NB35, and different Eurasian domesticates, including many ancient Western European ones, which reveals a likely expansion of certain subclades east and west with the Repin culture.
  • (…) DOM2 contributed 22% to the ancestor of Przewalski’s horses ca. 9.47 kya, suggesting the Holocene optimum, rather than the Eneolithic Botai culture (∼5.5 kya), as a period of population contact. This pre-Botai introgression could explain the Y chromosome topology, where Botai horses were reported to carry two different segregating haplogroups: one occupied a basal position in the phylogeny while the other was closely related to DOM2. Multiple admixture pulses, however, are known to have occurred along the divergence of DOM2 and the Botai-Borly4 lineage, including 2.3% post-Borly4 contribution to DOM2, and a more recent 6.8% DOM2 intogression into Przewalski’s horses (Gaunitz et al., 2018). Model C2 parameters accommodate all these as a single admixture pulse, likely averaging the contributions of all these multiple events.

    horse-domesticate-y-dna-mtdna
    Tip labels are respectively composed of individual sample names, their reference number as well as their age (years ago, from 2017). Red, orange, light green, green, dark green and blue refer to modern horses, ancient DOM2, Botai horses, Borly4 horses, Przewalski’s horses and E. lenensis, respectively. Black refers to wild horses not yet identified to belong to any particular cluster in absence of sufficient genome-scale data. Clades composed of only Przewalski’s horses or ancient DOM2 horses were collapsed to increase readability.

    (A) Best maximum likelihood tree retracing the phylogenetic relationships between 270 mitochondrial genomes.

    B) Best Y chromosome maximum likelihood tree (GTRGAMMA substitution model) excluding outgroup. Node supports are indicated as fractions of 100 bootstrap pseudoreplicates. Bootstrap supports inferior to 90% are not shown. The root was placed on the tree midpoint. See also Table S5 for dataset information.

    Image modified from the paper, including a red square in archaic groups that contain the Hungarian sample, and a red circle around the most likely common ancestral stallion and mare from the Pontic-Caspian steppes.

    The paper cannot offer a detailed picture of ancient horse domestication, but it is yet another step in showing how Repin/Yamna is the most likely source of expansion of horse domesticates in Eurasia. Even more interestingly, Yamna settlers in Hungary probably expanded an ancient lineage of that horse at the same time as they spread with the Classical Bell Beaker culture. Remarkable parallels are thus found between:

    The expansion of an ancient line of horse domesticates related to Yamna Hungary/East Bell Beakers seems to be confirmed by the pre-Iberian sample from Vilars I, Els Vilars4618 2672 (ca. 700-550 BC), likely of Iberian Beaker descent, showing a lineage older than the Indo-Iranian ones, which later replaced most European lines.

    NOTE. For known contacts between Yamna and Proto-Beakers just before the expansion of East Bell Beakers, see a recent post on Vanguard Yamna groups.

    The findings of the paper confirm the expansion of the horse firstly (and mainly) through the steppe biome, mimicking the expansion of Proto-Indo-Europeans first, and then replaced gradually (or not so gradually) by lines brought to Europe during westward expansions of Bronze Age, Iron Age, and later specialized horse-riding steppe cultures. The expansion also correlates well with the known spread of animal traction and pastoralism before 2000 BC:

    animal-traction-europe
    Top image: Map with evidence of animal traction before ca. 2000 BC. Bottom image: frequency of finds of evidence for animal traction (orange), cylinder seals (purple) and potter’s wheels (green) in the 4th and 3rd millennium BC (query from the Digital Atlas of Innovations). The data points to an early peak in the expansion of this innovation at the turn of the 4th–3rd millennium BC, while direct evidence supports a radical increase from around the mid–3th millennium BC until the early 2nd millennium, coinciding with the expansion of East Bell Beakers and related European Early Bronze Age cultures. Data and image modified from Klimscha (2017).

    EDIT (3 MAY 2019): A recent reminder of these parallel developments by David Reich in Insights into language expansions from ancient DNA:

    • Yamna expansion to the west “with horses and wagons”, with a more homogeneous ancestry in modern Europeans due to later migrations from the east (and north):

    • “Descendants” of Yamna (once the culture was already “dead”), expanding to the east mainly with Corded Ware ancestry:

    Another recent open access paper on horse domestication is The horse Y chromosome as an informative marker for tracing sire lines, by Felkel et al. Scientific Reports (2019).

    Related

7 thoughts on “Yamna the likely source of modern horse domesticates; the closest lineage, from East Bell Beakers

  1. I added info about Y-chromosome topology as described in the paper.

    I found interesting that the archaic Botai-Borly4 group, including Dunaujvarus Duk2, also includes (apparently from a common branch):

    – An Estonian Early Iron Age sample: Ridala_Rid2_2717 (ca. 8th-7th c. BC).

    – A Roman sample from Autricum, present-day Chartres (ca. AD 1st c.).

    That Corded Ware must have expanded with horses related to the Repin/Yamna ones is expected, due to the known relationship between Khvalynsk and Sredni Stog.
    [In any case, Corded Ware horses will show an admixture with local ones; like Hungarian Duk2 shows an admixture with local horse populations.]

    From Wutke et al. (2018):

    https://indo-european.eu/wp-content/uploads/2018/04/horses-y-chromosome-map.png

    Whether or not these stallions belong to lines from Corded Ware horses, or to a more recent expansion: possibilities would include horse-riding cultures from the steppe who managed to keep breeding “archaic” male lines, as well as contacts with Germanic or Balto-Slavic populations with archaic lines to the west.

    The following image is from Felkel et al. (2019):

    The position of variant fBOI (indicative for Y-HT1 in Wutke et al. 2018) is marked by an arrow.

    https://indo-european.eu/wp-content/uploads/2019/05/y-ht1-botai.png

    Given the known evolution of the horse in Europe, I would say it is much more likely that they belong to a more recent steppe-related expansion than to Corded Ware. Not much more recent, though, based on its phylogenetic relationship with Sintashta horses… Image from Gaunitz et al. (2018):

    https://indo-european.eu/wp-content/uploads/2019/05/ancient-horses-domesticates-przewalski.jpg

  2. Dunaujvaros_Duk2_4077 is about 40K+/- south of Bell Beaker samples described by Bell Beaker Blogger-https://bellbeakerblogger.blogspot.com/2017/07/szigetszentmiklos-cemetery-santas-six.html

    Perhaps an active horse breeding trade network, as outlined below.
    “Szigetszentmiklós Cemetery (Santa’s Six Foot Elves)
    Next up is a gigantic cemetery in Szigetszentmiklós township on Csepel Island (Shea-pel). In Hungarian, “Santa Claus Island” (I believe) is broken down: Sziget (Island) Szent (Saint) Miklos (Nicholas). Like the previous Neolithic, the Eastern Domain of Beakers preferred enormous cemeteries to which they grafted themselves.

    The first Beaker immigrants were largely buried in the N-S gender differentiated format deriving from further west on the Danube. Over time Beaker graves in this area trend toward cremation urns, which is viewed as regression to native habits. This cemetery at Szigetszentmiklós is noteworthy for a larger percentage of inhumations than other Csepel Beaker cemeteries. It also has its fair share of bodiless burials, which is a freaky Beaker thing, or they could be bothros pits.

    Like the Małopolskan Beakers from the previous post, the initial Beaker ethnic is wholly alien to this region, being characterized as a tall, Alpine, wide-faced, strongly-built people with pronounced brachycephaly. The prominent noses, cheeks and mastoid processes are often remarked upon, including from the Köhler paper below.

    The cemetery described in these three papers is “Felső Ürge-hegyi dűlő”, which is a motorway site unrelated to a previous one at Szigetszentmiklós. This part was excavated in 2006-2007 by Robert Patay (paper below). These profiles are from “The Beaker Phenomenon and the Genomic Transformation of Northwest Europe” by Olalde et al, 2017″
    …………………………

    “It could also be viewed as fray from a region that in some past time sent out founder lineages; but whether true or not, I don’t think that would really describe this man’s personal history, not on Csepel Island. Some sites on the island have ridiculous quantities of horse remains. I2787’s family history may reflect the horse trade and networks that connected different peoples in this area. Maybe his parents were some of those different peoples.”

  3. Another interesting paper if one is interested in early pit grave burials with tools and their proximity to Yamnaya–zoomorphic – like pommels and burials with wheels[wagon parts and axe moulds].

    ARCHAEOLOGICAL AND NATURAL SCIENTIFIC
    STUDIES OF PIT-GRAVE CULTURE BARROWS
    IN THE VOLGA-URAL INTERFLUVE
    “The aim of the paper is to provide the research results concerning the Pit-Grave culture sites
    of the south Ural region, which is a part of the Volga-Ural interfluve—”

    “In the Ural region, we discovered 162 Pit-Grave burials in 152 kurgans
    (according to the data of 2014). Burial grounds (52 studied in total) were situated
    on fluvial terraces of the Samara, the Irtek, the Kindelya, the Ural, the Ilek and
    other rivers. In spite of the long-term search only one large settlement of the PitGrave culture (located on the Turganik River) has been discovered in the Ural
    region. A number of the burials (the Uranbash and Pershin barrow cemetery) were
    found on the area of the Kargala copper deposit.
    Thus, the burials constitute the main source for studying the Pit-Grave culture
    of the Bronze Age population in the steppes of Eastern Europe. ”

    ” intentionally (Fig. 3: 1).
    The number of burials with grave goods was much bigger for II CG and
    comprised about 60%. Pottery was placed in 18 burials. Complexes with copper
    items were singled out including prestigious articles such as an axe tooth, knivesdaggers, a hammer, axes, gouges, a spear-head, an adze with trunnions and an
    adze-hammer”

    “According to radiocarbon dating, Developed stage B chronology was determined in the period from 3000–2900 to 2600–2500 cal ВС. Complexes with rare
    artefacts were dated, which allowed to find out the time of their spread. For
    example, the burial Pershin, 1/4 with an axe mould (Fig. 2: 6) was dated (14C) to
    4200 ± 60 ВР (Chernykh et al. 2000). Professor Y. van der Plicht received similar
    dates of human bones (Morgunova & van der Plicht 2013) for burials with axes
    cast in the same mould as the tools from Tamar-Utkul VII and VIII (Fig. 3: 3).
    A date of ceramics from these burials was the same (Fig. 3: 2).
    The burials with wagon parts from the Shumaevo II single kurgan, the
    Shumaevo II kurgan burial ground (Fig. 2: 1), and elite burial of the Boldyrevo I
    1/1 kurgan (Fig. 4) with numerous articles of copper and meteor iron dated to
    the same chronological interval. The classic stage of the Pit-Grave culture in
    other steppe areas of Eastern Europe was usually determined to 3000–2600 cal ВС.
    The end date is proved by 14C dates of the Early Catacomb burials (Nikolova 1999;
    Ivanova 2006; Shishlina 2007; Nikolova & Kaiser 2009). ”
    http://www.kirj.ee/public/Archaeology/2016/issue_2/arch-2016-2-128-149.pdf

  4. I have added information about the archaic mtDNA line including the Hungarian sample, which also includes a sample from Lebyazhinka IV, a Samaran site eventually linked to the Repin culture:

    Individual LebyazhinkaIV_NB35_Neolithic was unearthed from the settlement of Lebyazhinka IV, Samara region, Russia. Based on excavated artifacts, this site has been associated with the Neolithic and the Copper Age. Animal bone remains found on site have been associated with beavers, horses, Siberian roe deers, aurochs and elks.

    [Read more about Lebyazhinka IV].

    While stallions might change a lot depending on the dominating culture and their preferences for certain horse types – hence the replacement in later times by lines from Iranian and Altaic horses – , mtDNA is obviously not subjected to the same strong founder effects, and different archaic lines can be seen surviving in different regions.

    Given the tight group formed by certain archaic lines east and west of the steppes, the survival of archaic mtDNA in European and Asian samples in common with the Lebyazhinka IV sample further supports the origin of the Bell Beaker and Indo-Iranian horse in late Khvalynsk-Repin.

  5. Congratulation for big work!
    I have a big question
    The Przewalski’s horses has 66 chromosome
    The domesticated horse has 64 chromosome

    Howe many chromosomes had that Botai horses?

    thank you
    George Ivanics dr.

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