- Researchers say history of China’s biggest ethnic group is more complex than many believe
- DNA study involving 20,000 unrelated people points to three river origins
After analysing DNA samples from more than 20,000 unrelated Han Chinese, examining their dialects and family geography and comparing those to archaeological DNA records, scientists concluded that the Yangtze and Pearl had equal claim with the Yellow to Han origins.
Progenitors from the three river valleys evolved independently, the Kunming team said, and distinctions found in the mitochondrial DNA (the mother’s line) of study volunteers added weight to their assertion.
About 0.07 per cent of the DNA examined in the Han Chinese study differed according to river valley origin. By comparison, the difference was much lower – 0.02 per cent – when the study volunteer data was assessed by dialect, the researchers said.
Earlier studies of genetic markers and microsatellite data that mapped the prevalence of DNA revealed that Han Chinese can be generally divided into two groups: North and South. The latest study found that the genetic variation between North and South Han Chinese is 0.03 per cent, considerably less significant than the distinction by rivers.
Dr Li Yuchun, lead author of the paper, said the findings helped trace the history of Han to the dawn of civilisation, the emergence of agriculture and the sustainable growth of population.
The earliest migrants from Africa to China arrived in what is now the southwest between 60,000 and 100,000 years ago, studies said. The genes of this group of hunter-gatherers were largely unchanged for tens of thousands years.
About 10,000 years ago, agricultural practices began to emerge in the valleys of the three rivers. Archaeologists found evidence of millet cultivation around the Yellow River, rice in the Yangtze, and roots and tubers in the Pearl.
“Increasing food led to a population boom in these areas. We can see it in the separate path of gene evolution,” Li said.
The research also found that women were able to preserve their genetic story better than men as they stayed at home to tend the fields, while men went to explore, trade or wage war.
“Females are resilient to invasion,” she said.
The cultural significance of knowing one’s ancestry
The research team planned to examine the Y-chromosome, which passed from father to son, to study the expansion of the Han civilisation, Li said.
“It will be interesting to hear the story from a male perspective,” she said.
As the Han empires expanded, many ancient ethnic groups such as Huns, Siberians, Khitan in northern China and the Thai-Khadai speaking peoples in the south, passed from the record.
Some researchers think these minorities become extinct, but others believe they were absorbed into the Han Chinese population.
Source: SCMP
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