Eastern Hunter-Gatherer (EHG) ancestry is represented by two individuals from Karelia – one of haplogroup R1a1a1-M417 (ca. 6425 BC) and the other of haplogroup J (ca. 5250 BC) – and one individual from Samara (ca. 5600 BC), of haplogroup R1b1a1a-P297. It has more ANE ancestry than any other ancient or modern population, being close to the sample from Afontova Gora (ca. 15980 BC), to the west of Lake Baikal.
The oldest aDNA sample of R1a-M420 lineage found in east Europe was at Vasylivka, dated ca. 8690 BC, at the same site of a later sample of haplogroup R1b1a2-V88, dated ca. 7250 BC. These and other three Mesolithic samples from Ukraine show an intermediate situation between EHG and Scandinavian Hunter-Gatherer ancestry. Later, during the transition of the Mesolithic to Neolithic, a decrease in ANE ancestry and an increase in WHG ancestry is observed.
Read more from indo-european.info