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. 2000 Oct;156(2):799–808. doi: 10.1093/genetics/156.2.799

Archaic lineages in the history of modern humans.

D Labuda 1, E Zietkiewicz 1, V Yotova 1
PMCID: PMC1461280  PMID: 11014825

Abstract

An important question in the ongoing debate on the origin of Homo sapiens is whether modern human populations issued from a single lineage or whether several, independently evolving lineages contributed to their genetic makeup. We analyzed haplotypes composed of 35 polymorphisms from a segment of the dystrophin gene. We find that the bulk of a worldwide sample of 868 chromosomes represents haplotypes shared by different continental groups. The remaining chromosomes carry haplotypes specific for the continents or for local populations. The haplotypes specific for non-Africans can be derived from the most frequent ones through simple recombination or a mutation. In contrast, chromosomes specific for sub-Saharan Africans represent a distinct group, as shown by principal component analysis, maximum likelihood tree, structural comparison, and summary statistics. We propose that African chromosomes descend from at least two lineages that have been evolving separately for a period of time. One of them underwent range expansion colonizing different continents, including Africa, where it mixed with another, local lineage represented today by a large fraction of African-specific haplotypes. Genetic admixture involving archaic lineages appears therefore to have occurred within Africa rather than outside this continent, explaining greater diversity of sub-Saharan populations observed in a variety of genetic systems.

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Selected References

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