The Ancient North Eurasian component — the component that MA-1 represents — was the element that had been missing from the picture, sitting as an unexplained residual in population genetic models until the Mal’ta genome gave it a location and a time depth.

The subsequent decade of research has added further dimensions: the possible existence of distinct founding populations with different ancestral compositions, the complex demographic history of the Americas after the initial peopling, and the population movements that have continued to shape the genetic landscape of the hemisphere in the millennia since the founding.

Each advance in understanding makes the story richer and more complex.

The founding of the Americas was not a single clean event but a process — extended in time, complex in its population composition, shaped by the specific demographic and geographic conditions of late Pleistocene and early Holocene Asia and the Americas.