New DNA evidence suggests a new chapter in knowledge of human evolution (AFP)DNA evidence has revealed that the oldest known common male ancestor is 340,000 years old, more than twice as old as previous estimates.
New Scientist reports that the sample comes from a recently deceased man named Albert Perry. After the African-American South Carolina man died, one of his relatives submitted a sample of his DNA to a company called Family Tree DNA for analysis.
The findings were published in the The American Journal of Human Genetics and may require researchers to adjust the known timeline of humankindâ€™s evolution.
And the historical mark came at something of a bargainâ€”the company does historical DNA analysis on individuals for about $150.
All previously compared DNA samples pointed to a common Y chromosome traced back to man who lived between 60,000 and 140,000 years ago. But Perryâ€™s DNA sample broke the trend, not matching up with this common ancestor.
"It's a cool discovery," Jon Wilkins of the Ronin Institute in Montclair, N.J., told New Scientist. "We geneticists have been looking at Y chromosomes about as long as we've been looking at anything. Changing where the root of the Y-chromosome tree is at this point is extremely surprising."
After the initial tests on Perryâ€™s DNA, geneticists at the University of Arizona conducted further tests to confirm the anomaly. The Y chromosome in Perryâ€™s test matched up with those of 11 men who all lived in one village in Cameroon.
University of Arizona researcher Michael Hammer says Perryâ€™s DNA suggests there may have been an earlier species of humans that went extinctâ€”but not before interbreeding with the more modern version of man.