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The genome of an ancient Rouran individual reveals an important paternal lineage in the Donghu population.

OBJECTIVES
Following the Xiongnu and Xianbei, the Rouran Khaganate (Rouran) was the third great nomadic tribe on the Mongolian Steppe. However, few human remains from this tribe are available for archaeologists and geneticists to study, as traces of the tombs of these nomadic people have rarely been found. In 2014, the IA-M1 remains (TL1) at the Khermen Tal site from the Rouran period were found by a Sino-Mongolian joint archaeological team in Mongolia, providing precious material for research into the genetic imprint of the Rouran.


MATERIALS AND METHODS
The mtDNA hypervariable sequence I (HVS-I) and Y-chromosome SNPs were analyzed, and capture of the paternal non-recombining region of the Y chromosome (NRY) and whole-genome shotgun sequencing of TL1 were performed. The materials from three sites representing the three ancient nationalities (Donghu, Xianbei, and Shiwei) were selected for comparison with the TL1 individual.


RESULTS
The mitochondrial haplotype of the TL1 individual was D4b1a2a1. The Y-chromosome haplotype was C2b1a1b/F3830 (ISOGG 2015), which was the same as that of the other two ancient male nomadic samples (ZHS5 and GG3) related to the Xianbei and Shiwei, which were also detected as F3889; this haplotype was reported to be downstream of F3830 by Wei et al. ().


DISCUSSION
We conclude that F3889 downstream of F3830 is an important paternal lineage of the ancient Donghu nomads. The Donghu-Xianbei branch is expected to have made an important paternal genetic contribution to Rouran. This component of gene flow ultimately entered the gene pool of modern Mongolic- and Manchu-speaking populations.