(Get an overview of human genetics.)
The research shows that Yu Hong arrived in Taiyuan approximately 1,400 years ago and most probably married a local woman.
Carvings found in the tomb depict scenes from his life, showing him to have been a chieftain of the Central Asian people who had settled in China during the Sui dynasty (A.D. 580 to 618).
The carvings suggest that his grandfather and father lived in northwest China's Xinjiang region and were nobles of the Yu country for which he is named.
Yu Hong died in A.D. 592, at the age of 59. His wife, who died in A.D. 598, was buried in the same grave.
Ancient Gene Flow
Scientists are using DNA to reconstruct ancient population movements in Asia and to determine when Europeans arrived there.
(See an atlas of ancient human migration.)
"The existence of European lineages in China was already known to us, but these lineages are mainly concentrated in Xinjiang province," Hui said.
"In the central part of China, west-Eurasian lineages are seldom found in modern populations and have never been found in an ancient individual."
Austin Hughes is an expert in molecular evolution at the University of South Carolina.
The discovery in China, he said, "shows that there has always been gene flow between human populations."
"I think it's possible that these types of genetic studies can give a clearer picture of human movements and human gene flow," Hughes added.
(Read related story: "China's Earliest Modern Human Found" [April 3, 2007].)
The DNA studies can also shed light on marriage patterns, said Frederika Kaestle of the Indiana Molecular Biology Institute at Indiana University in Bloomington.
"In many cases there are no other methods that allow us to gain access to information on geographic origin or relatedness of individuals in archaeological contexts," Kaestle said.
However, she added, it is impossible to draw conclusions about population movement into the region based on this one DNA sample.
"Was it just this one man [who moved into the area], or was it a large family including this man, or was it an even larger group of people from his ancestral population?" she asked.
Overall, she said, "the study of ancient mitochondrial DNA, as well as other genomic variations, holds great promise for enhancing our understanding of human prehistory."
"This is a nice example of how genetic and archaeological approaches can be combined fruitfully."
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