A new mathematical test identifies ancient interbreeding without needing fossil DNA
In short: Researchers have developed a new statistical method, known as the D statistic, to detect whether modern humans interbred with extinct relatives like Neanderthals. By analyzing patterns of genetic variation across three different populations, this tool can identify signs of ancient admixture even when no physical remains or DNA samples from the extinct group are available.
This method is significant because it allows scientists to trace complex evolutionary histories using only modern human genomes. It works by identifying asymmetries in gene trees that occur when two groups mix, while remaining largely unaffected by variables like ancestral population sizes.
The researchers tested the statistic's reliability against sequencing errors and different demographic scenarios. However, they noted that certain types of population subdivision in ancestral groups can sometimes mimic the signals of recent interbreeding, potentially complicating the interpretation of results.
Why it matters: Scientists can now use modern DNA alone to uncover ancient interbreeding events between humans and extinct relatives.
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Sources
- Summary by Intellect · source: Research: Durand et al. (2011). Testing for Ancient Admixture between Closely Related Populations. Molecular Biology and Evolution.
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