Steppe Eneolithic and the Origins of Yamnaya Ancestry
In 2019, Wang et al. published three ancient DNA samples from the northern Caucasus foothill steppe region. These samples were labeled Steppe Eneolithic. In genetic studies, the term “Steppe” is usually used to describe DNA profiles related or similar to the Yamnaya genetic profile.
These Steppe Eneolithic samples were remarkable because they already displayed a genetic profile similar to Yamnaya, while being older than the Yamnaya culture itself. At the time, however, they did not receive the attention they deserved, largely because they were not associated with a well-known archaeological culture.
In 2024, Lazaridis et al. proposed a new term for this population: the Caucasus–Lower Volga (CLV) cline, and added additional samples with similar genetic profiles. Genetic modeling showed that Yamnaya populations derived most of their genome-wide ancestry from these CLV groups.
Despite this important progress, two crucial Y-DNA markers were still not securely linked to the CLV population: R1b-M269 and R1a-M417, the two major lineages that later expanded widely across Eurasia and are often associated with the spread of Indo-European languages.
New Evidence
The study by Ghalichi et al. (2024) helped fill this gap. Two new cases of R1b-M269 were discovered north of the Caucasus, predating the Yamnaya culture. These individuals had ancestry similar to other Steppe Eneolithic groups and were dated to approximately 3800 BCE.
It is worth noting that an older R1b-M269 sample (I33307) from Kalmykia, dated to around 3700 BCE, had already been reported. However, its genetic profile is identical to Core Yamnaya, which raises the possibility that the radiocarbon date may be somewhat inaccurate. In Lazaridis et al., this sample was classified as part of the Russia_CaspianInland_EBA_Yamnaya group, which is why it is not included in the list of Steppe Eneolithic Y-DNA samples (4700–3000 BCE).
(See the map for the geographic area.)
Steppe Eneolithic Y-DNA Distribution (4700–3000 BCE)
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R1b-V1636 — 9 samples
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R1b-M269 — 2 samples
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R1a — 1 sample
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I2-L699 — 1 sample
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J2a — 1 sample
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J2b2a — 1 sample
Another possible early R1b-M269 case (around 4500 BCE) was discovered in a Varna culture burial in Bulgaria. Its autosomal profile clearly shows Steppe Eneolithic–related ancestry, indicating that it was not related to local Neolithic farmers but rather represents a migrant from the Caucasus–Lower Volga region.
The Varna culture itself was unusual, characterized by a highly hierarchical social structure. Its graves contained large quantities of gold artifacts, among the earliest known examples of gold metallurgy.
The Role of J2b2a-L283
Another important finding in the Steppe Eneolithic context is J2b2a-L283. Its autosomal profile shows a stronger Caucasus-related component, which is understandable. Nevertheless, it clearly belonged to the emerging Eneolithic kurgan populations, from which both the Yamnaya culture and the Corded Ware culture would develop several centuries later.
The Question of R1a-M417
So far, R1a-M417 has not yet been identified in the Steppe Eneolithic / CLV context. However, one of the oldest R1a-M198 samples (closely related to M417) was found in the Middle Volga region, suggesting that M417 may eventually be discovered within the CLV or Steppe Eneolithic populations as well. Currently, one of the oldest known R1a-M417 individuals comes from a Yamnaya layer in the Balkans.
Implications for Yamnaya Origins
Based on these findings, I remain skeptical of the hypothesis that Yamnaya originated directly from the Sredny Stog culture in Ukraine, as sometimes suggested in discussions.
The highest diversity of R1b-Z2103 lineages that are positive for Z2103 but negative for Z2106 is found in the Near East, suggesting that the region where Z2103 began its expansion was likely close to the Caucasus. Additional ancient DNA samples will hopefully clarify this question in the future.
Note
The Eneolithic Y-DNA list above does not include samples from Steppe Maykop, which have a different origin related to Central Asian ancestry.
In addition, one R1b-V1636 sample is dated to around 2800 BCE, slightly later than the 3000 BCE cutoff used here. However, its autosomal profile indicates that it belonged to the preceding Steppe Eneolithic population, rather than to Core Yamnaya.