Native American family tree sprouts a new branch

Genomic analysis of a member of an ancient Alaska population yields clues about the peopling of the Americas.

Illustration by Eric S. Carlson
The Upward Sun River archaeological site in central Alaska's Tanana River Basin was once a campsite for the Ancient Beringians.

A six-week old infant who died some 11,500 years ago in central Alaska is now providing clues about how the Americas first came to be populated.

Genomic data from remains of the girl – named “Xach'itee'aanenh T'eede Gaay” (Sunrise Girl-Child) by the local indigenous community –  broadly support a migration model that scientists have long argued for, while also revealing the existence of an ancient population previously unknown to science.

“We’ve said for decades that the first Americans came from Northeast Asia to the Americas during the late Pleistocene, but the empirical evidence for that has not been at our fingertips as it is now,” says Ted Goebel, an anthropologist at Texas A&M University in College Station, who was not involved with the study. “To finally start to see the genomic evidence come forth to help us test these theories we’ve developed based on stone tools is really cool."

The girl was a member of an ancient population that the report authors have named “Ancient Beringians.” Beringia is the name given to Alaska, Eastern Siberia, and the land bridge that periodically connected the two during the last ice age.

The findings suggest a revised family tree: a single ancestral Native American group split from East Asians about 35,000 years ago, before later splitting, some 20,000 years ago, into two distinct groups. One was the Ancient Beringians, and the other constituted the ancestors of modern-day Native Americans, who later split into northern and southern populations about 15,700 years ago.

“Trying to integrate these findings with what we know from archaeology and paleoecology presents exciting new puzzles,” says Ben Potter, an anthropologist at the University of Alaska in Fairbanks and one of the lead authors of the study, which was published Jan. 3 in the journal Nature. He first discovered the archaeological site in 2006 and has been working there ever since. “The peopling has been shown now to be more complex than we thought previously.”

Scientists have sought ancient human remains from Beringia at the end of the last ice age, says Victor Moreno-Mayar, a geneticist at the Centre for GeoGenetics at the University of Copenhagen’s Natural History Museum of Denmark, who conducted much of the genetics work for the study. The discovery of three individuals, one of them cremated, fulfilled this wish.

But Xach'itee'aanenh T'eede Gaay's genome held a surprise: it was clearly Native American, but not from either of the two major modern Native American groups. “It represented a population that diverged from that common ancestor,” says Dr. Moreno-Mayar.

All of this helps narrow down and strengthen the theories of just how those populations arrived in the Americas. It also lends support to the so-called “Beringian standstill” hypothesis, which posits that there was a period of time in which a genetic isolation of ancestral Native Americans occurred before they migrated south, either in Beringia or in Northeast Asia.

But mysteries remain, including definitive answers about where and when some of these population splits occurred and which migration routes were used.

In their paper, the authors outline two possible models. In one scenario, which Dr. Potter favors since it matches well with archaeological data and paleoecological data, the split occurred in Northeast Asia, and the two separate populations later crossed over the land bridge prior to 15,700 years ago, when the Native American ancestors split again. With the ice age still at its maximum around 20,000 years ago, Potter notes that any further migration would have been difficult.

In the other theory, the ancestral population had already arrived in Alaska or eastern Beringia by 20,000 years ago, and the split occurred there, with the second split into North and South American populations occurring south of the ice sheets.

What happened to the Ancient Beringians? They might have died out, says Potter, or they could have been absorbed by Northern Native Americans who migrated back to the far North.

Dr. Goebel likens the puzzle to a murder mystery. “You read the book, and the author divulges new clues over the course of the book,” he says. “Every time a new genome is analyzed and reported, it provides a new clue that’s making the pathway to uncover the real story that much clearer.”

You've read  of  free articles. Subscribe to continue.
Real news can be honest, hopeful, credible, constructive.
What is the Monitor difference? Tackling the tough headlines – with humanity. Listening to sources – with respect. Seeing the story that others are missing by reporting what so often gets overlooked: the values that connect us. That’s Monitor reporting – news that changes how you see the world.

Dear Reader,

About a year ago, I happened upon this statement about the Monitor in the Harvard Business Review – under the charming heading of “do things that don’t interest you”:

“Many things that end up” being meaningful, writes social scientist Joseph Grenny, “have come from conference workshops, articles, or online videos that began as a chore and ended with an insight. My work in Kenya, for example, was heavily influenced by a Christian Science Monitor article I had forced myself to read 10 years earlier. Sometimes, we call things ‘boring’ simply because they lie outside the box we are currently in.”

If you were to come up with a punchline to a joke about the Monitor, that would probably be it. We’re seen as being global, fair, insightful, and perhaps a bit too earnest. We’re the bran muffin of journalism.

But you know what? We change lives. And I’m going to argue that we change lives precisely because we force open that too-small box that most human beings think they live in.

The Monitor is a peculiar little publication that’s hard for the world to figure out. We’re run by a church, but we’re not only for church members and we’re not about converting people. We’re known as being fair even as the world becomes as polarized as at any time since the newspaper’s founding in 1908.

We have a mission beyond circulation, we want to bridge divides. We’re about kicking down the door of thought everywhere and saying, “You are bigger and more capable than you realize. And we can prove it.”

If you’re looking for bran muffin journalism, you can subscribe to the Monitor for $15. You’ll get the Monitor Weekly magazine, the Monitor Daily email, and unlimited access to

QR Code to Native American family tree sprouts a new branch
Read this article in
QR Code to Subscription page
Start your subscription today