Today’s East Asian ancestors emigrated to the area about 19,000 years ago, in the process replacing the mysterious people who previously lived there.
Researchers have talked about these mysterious people Genetics A 40,000-year-old “countryman” found in a rural cave in Beijing DNA From the bodies of 25 ancients in the Amur region, including eastern China and parts of Russia.
The team discovered that the ancestors of the rural people were likely to have spread to East Asia 40,000 to 33,000 years ago. But then, just as the ice sheet disappeared and a new population emerged about 19,000 years ago, the Last Glacial Period Maximum (LGM) -the ice sheet reached its maximum range about 26,500 to 19,000 years ago. When reached-just as the study ended, the senior author of the study said: Qiaomei Fu, a paleontologist at the Institute of Vertebrate Paleontology, Institute of Vertebrate Paleobiotics, Chinese Academy of Sciences in Beijing, said:
2003, another research group Discovered the body of a rural personAnd to this day, personal DNA is the oldest known ancient human genome in East Asia. Thanks to Tianyuan Man and other archaeological discoveries, researchers know that modern humans lived in Northeast Asia as early as 40,000 years ago. This region includes the Mongolian Plateau, northern China, Japan, the Korean Peninsula, and the mountainous regions of the Russian Far East. Recently the study Have got It sheds light on East Asian vitality from about 9,000 years ago to recent historic times, but little is known about what happened 40,000 to 9,000 years ago, Fu said. It was.
For investigation, Hu and her colleagues compared the DNA of the rural people with the ancient bodies that lived in the Amur region, including the pine nen plains of northeastern China, 33,000 to 3,400 years ago.
This period covers the time when the glaciers that covered the vast belt of the Earth retreated, “important to understand what happened to the people of Northeast Asia before, during, and after LGM. “Fu told Live Science in an email. After all, Northeast Asia is located at the same latitude as Central and South Europe. “In Europe, the migration and size of the human population was affected by ice age climate change,” the researchers wrote in the study. “These climate changes may have had a similar impact on the history of the population of high latitudes and altitudes in Asia.”
Ancient DNA analysis revealed that the oldest person they studied, a Pleistocene woman known as AR33K, lived in the Amur region about 33,000 years ago (AR stands for Amur). , 33K stands for 33,000). Mr. Fu compared with all other ancient and modern individuals published from East Asia.
Another ancient woman whose DNA was described in a previous study lived in the Salkhit Valley in northeastern Mongolia about 34,000 years ago. The woman was found approximately 720 miles (1,159 km) from AR33K and approximately 692 miles (1,114 km) from Tengen Cave.Journal 2020 Study Science Women in Salkhit found that they shared 75% of heredity with rural men and 25% with another East Asian group who lived along the Yana River in northern Siberia. Given that both AR33K and Tianyuan men share about 75% of their DNA with Salkhit women, these people may have been part of a related group that traveled to East Asia for at least 7,000 years. there is. Fu told Science magazine...
However, unlike monkey-hit women, AR33K has fewer Yana-related ancestors than Tianyuan men, researchers wrote in a new study: “This is probably Tengen / AR33K’s ancestors LGM. It has previously spread to Northeast Asia, geographically from northern China to Mongolia, the Amur region, and timely 40,000 to 33,000 years ago, “Fu told Live Science. Said in an email. ..
To explain the genetics of Sarhit women, perhaps those with heavenly ancestry were paired with those of Mongolian Yana ancestors, but were isolated from the ancients of the Amur region before LGM. Was, the researcher wrote in the study.
The oldest “newcomer”
Another prominent figure in this study, the AR19K, who lived in the Amur region about 19,000 years ago towards the end of LGM, attracted the attention of researchers. The genetic ancestors of AR19K, unlike Tianyuan and AR33K, “indicate a potential population shift,” Fu said. In other words, AR33K and Tianyuan inherited some genes to modern East Asians (Fu called them “the basis of all East Asians”), while populations carrying those genes It disappeared at some point in the LGM.
In fact, AR19K is “the earliest Northeast Asian ever identified”, meaning that this individual is an ancient Northeast Asian ancestor. This identification of Northeast Asian ancestors “indicates that the north-south genetic segregation in East Asia is as early as 19,000 years ago, 10,000 years earlier than previously discovered,” Fu said.
Younger samples revealed that some East Asian regions had significant genetic links to the past. For example, researchers have previously found that modern populations in the Amur region have 8,000 years of genetic continuity with Neolithic predators and farmers who lived in the Devil’s Gate Cave in the Russian Far East and the Amur region. I thought I was there. However, a new analysis showed that this continuity was 14,000 years, or “6,000 years earlier than previously proposed,” Fu said.
Hair, sweat and teeth
The study also narrowed the time frame for the emergence of an Asian-specific genetic variant known as EDAR V370A. The mutant is associated with features such as thicker hair shafts, more sweat glands, and shovel-shaped incisors, Fu said.
“We show that this gene mutation is likely to rise frequently after LGM,” said Fu. “Our direct observations using ancient DNA are EDAR. May support the hypothesis that selection in V370A has increased Vitamin D In low UV breast milk [ultraviolet light] environment. “
Overall, this result suggests that LGM had a great impact on the ancient people who lived in East Asia. “This ancient DNA study provides a clearer picture of the deep history of Northeast Asian populations,” said Fu.
This study was published online in the journal on May 27. cell..
Initially published in Live Science.
The mysterious East Asian disappeared during the Ice Age. This group replaced them.
Source link The mysterious East Asian disappeared during the Ice Age. This group replaced them.