Alaskan 'Sunrise' Girl: Ancient DNA Helps Explain Population


"It would be hard to overstate the importance of this newly revealed people to our understanding of how ancient populations came to inhabit the Americas", said Dr Ben Potter, an anthropologist at the University of Alaska Fairbanks and one of the lead authors of the study. He added that he was unconvinced that the ancient Beringian group split from the ancestors of other Native Americans 20,000 years ago, because even tiny errors in scientists' data can lead to radically different split times for evolutionary lineages.

An global team led by scientists from the University of Cambridge and the University of Copenhagen successfully sequenced the genome of a six-week-old infant girl discovered at the Upward Sun River site in Alaska.

David Reich, a geneticist at Harvard University who studies ancient DNA, says genetic material like this tells a more detailed story of how people came to America, but not the whole story.

Decoding the infant's complete set of DNA let researchers estimate the timing of key events in the ancestral history of today's Native Americans and indigenous peoples of Canada and Central and South America.

Around 20,000 that group divided again into the Ancient Beringians and the general ancestors of all other Native Americans. The skeleton has been dated to 11,500 years ago, and the genome now suggests it represents a member of a now-lost population that occupied the Beringian land bridge at the peak of the last glacial period-and gave rise to Native Americans. About 25,000 years ago, this group mixed and bred with ancient north Eurasians in the region, the descendants of whom went on to become the first Native Americans to settle the New World. The researchers worked closely with native representatives while recovering and examining the remains and the rest of the archaeological site, Potter said.

Before this discovery, it was clear that northern Native Americans had genetically split from southern Native Americans earlier than 12,600 years ago, because that is the age of the Anzick-1 human remains in Montana, associated with Clovis culture, known for their signature bone tools.

At some point, it's suspected these people moved as one in a single mass migration into North America, before - some 15,000 years or so later - the population split into two groups.

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A scientific illustration of the Upward Sun River camp in what is now Interior Alaska.

Scientists were able to examine her ancient DNA and draw connections between ancient peoples and how they are related to one another. He reports the analysis along with others in a paper released Wednesday by the journal Nature. The two groups are related, but a link between them and an ancient Siberian population was missing, until now.

But the study does narrow the timeframe for the great migration, and said it was unlikely to have happened in several waves.

Potter, however, argues that the lineage that led to Native Americans started splitting into three main branches while still in Siberia, long before reaching Alaska. They compared the sample with the genes of people from around the world. More genetic evidence of these Ancient Beringians, along with more archaeological evidence, will be required to affirm these findings and push this research forward.

The information, which originated from archeological finds in Alaska, likewise indicates the presence of a formerly obscure Native American populace, whom scholastics have named "Antiquated Beringians".

This timeline enabled the researchers to develop a framework of how and when the continent might have been settled by a common population of ancestral Native Americans that gradually separated into these sub-groupings. The study also reaffirms a pre-existing theory known as the "Standstill Model" - the possibility that the descendents of this single-source population were living in Beringia until about 11,500 years ago. In other words, it is more similar to what we'd predict the ancestor of all Native Americans would look like, genetically.