Population Expansion in Japan
Author Information
Author(s): Peng Min-Sheng, Zhang Ya-Ping
Primary Institution: State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences
Hypothesis
What were the population dynamics of the Japanese archipelago during prehistoric times?
Conclusion
The study found that a rapid population expansion around 5,000 years ago significantly shaped the current maternal gene pool of the Japanese.
Supporting Evidence
- A rapid population expansion since approximately 5,000 years ago was identified in the mitochondrial DNA of Japanese.
- About 72% of Japanese mtDNA lineages showed a significant genetic signature from this expansion.
- The study suggests a smooth transition from the Jomon to Yayoi periods in Japanese history.
Takeaway
A long time ago, the number of people in Japan grew really fast, which helped shape who the Japanese people are today.
Methodology
The study used Bayesian skyline plots to analyze 952 Japanese mitochondrial DNA genomes to estimate changes in female effective population size over time.
Limitations
The study primarily reflects maternal history and may not account for other demographic factors like migration and admixture.
Participant Demographics
The study focused on Japanese individuals, excluding Ainu and Ryukyuan populations.
Digital Object Identifier (DOI)
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