The principal founding lineage of the Americas
Haplogroup Q, defined by M242, is the principal founding paternal lineage of the Indigenous peoples of the Americas, and it is also found across Siberia, Central Asia and parts of the Near East. It descends from the P node and represents the lineage that crossed from northeastern Asia into the Americas during their initial peopling.
Haplogroup Q dominates the paternal ancestry of Indigenous American populations from the Arctic to the southern tip of South America. In the Old World it is found across Siberia — where its deeper roots lie — and at lower frequencies in Central Asia, the Near East and parts of Europe. This distribution ties together the peoples of northern Asia and the Americas.
Haplogroup Q is understood to have arisen in Asia and to have been carried by the populations that crossed the Bering land bridge into the Americas during the last Ice Age. The American branches then expanded to cover two continents. Age estimates for the key branches are consistent with the timescale generally proposed for the initial peopling of the Americas, though details remain actively studied.
Q's most important branch for the Americas is the one carried by the great majority of Indigenous American men, which itself divides into sublineages distributed across North, Central and South America. Other branches of Q remain in Siberia, Central Asia and the Near East, reflecting the lineage's Old World origins.
A Q result most often indicates Indigenous American paternal ancestry, though it can also reflect Siberian, Central Asian or Near Eastern origins. Downstream testing distinguishes the American founding branches from the Old World ones, which is an important distinction for family history.
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