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Genetics, Vol 144, 1237-1245, Copyright © 1996
INVESTIGATIONS |
Measuring and Testing Genetic Differentiation With Ordered Versus Unordered Alleles
O. Pons and R. J. Petit
Institut National de la Recherche Agronomique, Laboratoire de Biometrie, 78352 Jouy-en-Josas cedex, France
Estimates and variances of diversity and differentiation measures in subdivided populations are proposed that can be applied to haplotypes (ordered alleles such as DNA sequences, which may contain a record of their own histories). Hence, two measures of differentiation can be compared for a single data set: one (G(ST)) that makes use only of the allelic frequencies and the other (N(ST)) for which similarities between the haplotypes are taken into account in addition. Tests are proposed to compare N(ST) and G(ST) with zero and with each other. The difference between N(ST) and G(ST) can be caused by several factors, including sampling artefacts, unequal effect of mutation rates and phylogeographic structure. The method presented is applied to a published data set where a nuclear DNA sequence had been determined from individuals of a grasshopper distributed in 24 regions of Europe. Additional insights into the genetic subdivision of these populations are obtained by progressively combining related haplotypes and reanalyzing the data each time.
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