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Molecular Biology and Evolution, Vol 10, 2-22, Copyright © 1993 by Society for Molecular Biology and Evolution
N Takahata
Genetic variation at most loci examined in human populations indicates that
the (effective) population size has been approximately 10(4) for the past 1
Myr and that individuals have been genetically united rather tightly. Also
suggested is that the population size has never dropped to a few
individuals, even in a single generation. These impose important
requirements for the hypotheses for the origin of modern humans: a
relatively large population size and frequent migration if populations were
geographically subdivided. Any hypothesis that assumes a small number of
founding individuals throughout the late Pleistocene can be rejected.
Extraordinary polymorphism at some loci of the major histocompatibility
complex (Mhc) rules out the past action of severe bottlenecks, or the
so-called founder principle, which invokes only a small number of founding
individuals when a new species emerges. This conclusion may be extended to
the 35-Myr-old history of the human lineage, because some polymorphism at
Mhc loci seems to have lasted that long. Furthermore, although the
population structure prior to the late Pleistocene is less clear, owing to
the insensitivity of Mhc alleles, even to low levels of migration, the
nature of Mhc polymorphism suggests that the effective size of populations
leading to humans was as large as 10(5). Hence, the effective population
size of humans might have become somewhat smaller in most of the late
Pleistocene. The reduction could be due either to the then adverse
environment in the Old World and/or to the increased migration rate. It is
also argued that population explosion fostered by the agriculture
revolution has had significant effects on incorporating new alleles into
human populations.
REVIEW ARTICLE
Allelic genealogy and human evolution
National Institute of Genetics, Graduate University for Advanced Studies, Mishima, Japan.
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