The haplogroup Q-M242 appears in China at very low frequencies (<3%, supplementary table S5, Supplementary Material online) and displays varied distribution patterns between North and South China (Fig. 3c; supplementary table S5, Supplementary Material online). This lineage, which might have originated in Central Asia and southern Siberia approximately 31 kya (Fig. 1b), includes the Q1a1a-M120 subclade. This subclade, unique to East Asians, is relatively prevalent among Han Chinese individuals (∼81% of all Q lineages, supplementary table S5, Supplementary Material online) and likely underwent a local expansion in Northwest China between 5 and 3 kya (Sun et al. 2019). Furthermore, the Q1a1a1-F1626 subclade, a derivative of Q1a1a-M120, diversified approximately 4.3 kya (Fig. 1b). The ML phylogenetic topology indicated that ancient Mongolian individuals with minimal West Eurasian-related ancestry (<20%) belonged to Q1a1a or its sublineages (Figs. 2 and 3a). Venn diagrams illustrating shared ancestry-correlated lineages also show that the Q and R lineages are common among the Yamnaya and ANA-associated lineages (supplementary fig. S15, Supplementary Material online). Moreover, ancient individuals from the middle Neolithic (MN) Yangshao culture and approximately 3,000-year-old Hengbei residents from Shanxi, who carried the Q1a1a-M120 lineage, indicate that this haplogroup influenced the Han Chinese gene pool at least 6 kya. Q1b-M346, although rare in China, is concentrated at the intersection of Siberia and North China (supplementary fig. S17b and table S5, Supplementary Material online), with some Bronze Age (BA) and IA individuals from the Mongolian Plateau and Xinjiang regions genotyped for Q1b or its subclades (Figs. 2 and 3a).