An interesting open genomic question is the origin and spread of Caucasus hunter-gatherer (CHG) ancestry in steppe populations during the Eneolithic.
My broad theory regarding the appearance of this ancestral component is based on:
- The assimilation of a previous steppe population during the formation of the early Khvalynsk – Sredni Stog I cultural-historical area.
- Genetic flow from migrations, mainly a westward expansion of Suvorovo-Novodanilovka Chiefs from Khvalynsk, and potential back-migrations.
- Innner genetic flow among steppe cultures in close contact.
Two recently published papers ivestigating the Don Region may shed some light on this issue: