Molecular Biology and Evolution, Vol 11, 749-761, Copyright © 1994 by Society for Molecular Biology and Evolution
MF Hammer
A member of the Alu family of repeated DNA elements has been identified on
the long arm of the human Y chromosome, Yq11. This element, referred to as
the Y Alu polymorphic (YAP) element, is present at a specific site on the Y
chromosome in some humans and is absent in others. Phylogenetic comparisons
with other Alu sequences reveal that the YAP element is a member of the
polymorphic subfamily-3 (PSF-3), a previously undefined subfamily of Alu
elements. The evolutionary relationships of PSF-3 to other Alu subfamilies
support the hypothesis that recently inserted elements result from multiple
source genes. The frequency of the YAP element is described in 340
individuals from 14 populations, and the data are combined with those from
other populations. There is both significant heterogeneity among
populations and a clear pattern in the frequencies of the insertion:
sub-Saharan Africans have the highest frequencies, followed by northern
Africans, Europeans, Oceanians, and Asians. An interesting exception is the
relatively high frequency of the YAP element in Japanese. The greatest
genetic distance is observed between the African and non-African
populations. The YAP is especially useful for studying human population
history from the perspective of male lineages.
ORIGINAL ARTICLE
A recent insertion of an alu element on the Y chromosome is a useful marker for human population studies
Laboratory of Molecular Systematics and Evolution, University of Arizona, Tucson 85721.
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