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Testing multiregionality of modern human origins
1Department of Biosystems Science, Graduate University for Advanced Studies, Hayama, Kanagawa 440-0193, Japan. takahata@soken.ac.jp
Molecular Biology and Evolution
|February 7, 2001
Summary
This study investigated Homo sapiens origins using DNA. Most ancestral sequences originated in Africa, suggesting a single founding population, challenging multiregional hypotheses.
Area of Science:
- Human Evolution
- Population Genetics
- Genomics
Background:
- The origin of anatomically modern Homo sapiens is debated, with multiregional and single-origin hypotheses.
- Understanding founding population dynamics is crucial for human evolutionary studies.
Purpose of the Study:
- To investigate the possibility of multiple founding populations for modern Homo sapiens.
- To test the multiregional hypothesis by analyzing genomic ancestry.
Main Methods:
- DNA sequence data collected from X-chromosomal, autosomal, and Y-chromosomal regions, plus mitochondrial DNA.
- Inferred ancestral sequences and populations for multiple genomic regions.
- Computer simulations to quantify the multiregional hypothesis under varying founding population sizes.
Main Results:
- Nine out of ten inferred ancestral sequences originated in Africa during the Pleistocene, with only one in Asia.
- Computer simulations indicated that a multiregional hypothesis could explain African ancestry in 90% of regions if the African founding population was significantly larger.
- Estimated breeding sizes: over 9,000 in Africa and less than 1,000 outside Africa.
Conclusions:
- The data strongly support a single founding population for modern Homo sapiens.
- The findings challenge multiregional models unless a vastly larger African founding population is considered.
- Further genomic data may solidify the conclusion of a single African origin.