September 22, 2011
New Technique Uses Genomes To Determine Ancient Human Migrations
Researchers at Cornell University have developed new statistical methods based on the complete genome sequences of living humans to shed light on events at the dawn of human history.
Although they analyzed just six genomes, the researchers made use of the fact that these genomes contain traces of genetic material from thousands of human ancestors, which have been assembled into new combinations over the millennia by genetic recombination.
The primary finding of the study is that the San, an indigenous group of hunter gatherers from southern Africa, diverged from other human populations about 130,000 years ago -- earlier than previously thought. By comparison, the ancestors of modern Eurasian populations migrated from Africa only about 50,000 years ago.
Previous studies of human demography have primarily relied on mitochondrial DNA from the maternal line or Y-chromosome data passed from fathers to their sons. However, those studies were limited by small numbers of genomic positions.
The current study uses the full genome of each individual, providing a more comprehensive view of human evolution, the researchers said.
"The use of genomewide data gives you much more confidence that you are getting the right answer," said Adam Siepel, associate professor of biological statistics and computational biology, and senior author of the paper.
"With mitochondrial DNA, you are only looking at one family tree [the maternal line], with one pathway from each individual to its ancestors. We are sampling from all possible pathways."
"What's unusual about our methods is that, not only do they use complete genome sequences, but they consider several populations at once," said Ilan Gronau, the paper's lead author and a postdoctoral associate in Siepel's lab.
"This is the first paper to put all of these pieces together," he said.
Previous studies using mitochondrial DNA, Y chromosomes and other markers have estimated that anatomically, modern humans arose roughly 200,000 years ago in eastern or southern Africa; and that the indigenous hunting-and-gathering central and southern African San people -- one of the most genetically divergent human populations -- diverged from other Africans about 100,000 years ago.
But the current study found that the San people split from other African populations somewhere between 108,000 and 157,000 years ago.
The estimate of an "out of Africa" migration somewhere between 38,000 and 64,000 years ago is consistent with recent findings using other methods, the researchers said.
The researchers began the study by taking a statistical approach that was originally developed to infer divergence times for related but distinct species, such as the human, chimpanzee and gorilla.
They faced a number of challenges in adapting these methods for use with human genome sequences. For example, the great ape genome method assumes that gene flow stops after two species diverge, because they can no longer mate. That is not true for distinct human populations, and without accounting for gene flow, the divergence times would have been underestimated, Siepel said.
Gronau used mathematical techniques to work around that problem and then created elaborate computer simulations to demonstrate that the new method worked within known parameters of human divergence.
The study was published September 18 in Nature Genetics.
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