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angle-left 20.10.2021 Origin of domestic horses finally established

Horses were first domesticated in the Pontic-Caspian steppes and the northern Caucasus, before conquering the rest of Eurasia within a few centuries. These are the results of a study led by paleogeneticist Ludovic Orlando, CNRS, who headed an international team in cooperation with partners from the Eurasia Department of the DAI. Answering a decades-old enigma, the study is published in Nature on 20 October 2021.

By whom and where were modern horses first domesticated? When did they conquer the rest of the world? And how did they supplant the myriad of other types of horses that existed at that time? This long-standing archaeological mystery finally comes to an end thanks to a team of 162 scientists specialising in archaeology, palaeogenetics and linguistics, among them Svend Hansen and Sabine Reinhold of the Eurasia Department and their Russian partners Andrey Belinksiy and Alexey Kalmykov from Stavropol region.

A few years ago, Ludovic Orlando's team looked at the site of Botai, Central Asia, which had provided the oldest archaeological evidence of domestic horses. The DNA results, however, were not compliant: these 5500-year-old horses were not the ancestors of modern domestic horses. Besides the steppes of Central Asia, all other presumed foci of domestication, such as Anatolia, Siberia and the Iberian Peninsula, had turned out to be false. “We knew that the time period between 4,000 to 6,000 years ago was critical but no smoking guns could ever be found” says CNRS research professor Orlando. The scientific team, therefore, decided to extend their study to the whole of Eurasia by analysing the genomes of 273 horses that lived between 50,000 and 200 years BC, some of them coming from the ongoing bioarchaeological work at the Eurasia Department.This information was sequenced at the Centre for Anthropobiology and Genomics of Toulouse (CNRS/Université Toulouse III - Paul Sabatier) and Genoscope (CNRS/CEA/Université d’Évry) before being compared with the genomes of modern domestic horses.

This strategy paid off: although Eurasia was once populated by genetically distinct horse populations, a dramatic change had occurred between 2000 and 2200 BC. “That was a chance: the horses living in Anatolia, Europe, Central Asia and Siberia used to be genetically quite distinct” notes Dr Pablo Librado, first author of the study. In the steppe it correlates to the formation of the post-Catacomb culture horizon, a network of related cultures inhabiting the vast area from the Southern Urals to the Black Sea. Then, a single genetic profile, previously confined to the Pontic-Caspian steppes (North Caucasus), began to spread beyond its native region, replacing all the wild horse populations from the Atlantic to Mongolia within a few centuries. “The genetic data also point to an explosive demography at the time, with no equivalent in the last 100,000 years” adds Pr Orlando. “This is when we took control over the reproduction of the animal and produced them in astronomic numbers.”

But how can this overwhelming popularity be explained? Interestingly, scientists found two striking differences between the genome of this horse and those of the populations it replaced: one is linked to a more docile behaviour and the second indicates a stronger backbone. The researchers suggest that these characteristics ensured the animals’ success at a time when horse travel was becoming “global”.

The study also reveals that the horse spread throughout Asia at the same time as spoke-wheeled chariots and Indo-Iranian languages. However, the migrations of Indo-European populations, from the steppes to Europe during the third millennium BC4 could not have been based on the horse, as its domestication and diffusion came later. This demonstrates the importance of incorporating the history of animals when studying human migrations and encounters between cultures.

 

This study was directed by the the Centre for Anthropobiology and Genomics of Toulouse (CNRS/ Université Toulouse III – Paul Sabatier) with help from Genoscope (CNRS/CEA/Université d’Évry). The French laboratories Archéologies et sciences de l'Antiquité (CNRS/Université Paris 1 Panthéon Sorbonne/Université Paris Nanterre/Ministère de la Culture), De la Préhistoire à l'actuel : culture, environnement et anthropologie (CNRS/Université de Bordeaux/Ministère de la Culture) and Archéozoologie, archéobotanique : sociétés, pratiques et environnements (CNRS/MNHN) also contributed, as did 114 other research institutions throughout the world, amongst them Svend Hansen and Sabine Reinhold of the Eurasia Department of the DAI. The study was primarily funded by the European Research Council (Pegasus project) and France Genomique (Bucéphale project). The DAI contributions were made possible by the ERC Advanced Grant ARCHCAUCASUS.

 

Nature paper
The origins and spread of domestic horses from the Western Eurasian steppes, Pablo Librado, (…), Ludovic Orlando. Nature, 20 October 2021, DOI: 10.1038/s41586-021-04018-9 
https://www.nature.com/articles/s41586-021-04018-9


Contacts
DAI Researchers l Svend Hansen, svend.hansen@dainst.de, Sabine Reinhold, sabine.reinhold@dainst.de
DAI Press Office l presse@dainst.de

CNRS Researcher l Ludovic Orlando l ludovic.orlando@univ-tlse3.fr
CNRS Press Officer l Véronique Etienne l T +33 1 44 96 51 37 l veronique.etienne@cnrs.fr

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