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Genetics, Vol 147, 1431-1444, Copyright © 1997
INVESTIGATIONS |
The Amounts of Nucleotide Variation Within and Between Allelic Classes and the Reconstruction of the Common Ancestral Sequence in a Population
H. Innan and F. Tajima
Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo 113, Japan
The amounts of nucleotide variation within and between allelic classes were studied. The expectation and variance of the number of segregating sites and the expectation of the average number of pairwise differences among a sample of DNA sequences were obtained by using the theory of gene genealogy with no recombination. When the ancestral allelic class is unknown, it was found that the amount of variation within an allelic class increases with its frequency in the sample, while the amount of variation between two allelic classes is the largest when the two allelic classes exist equally. On the other hand, if we know the ancestral allelic class, as the frequency of the mutant allelic class increases, the amounts of variation within the mutant allelic class and between two allelic classes increase and the amount of variation within the ancestral allelic class decreases. As an example, we analyzed the polymorphism in the ND5 gene of Drosophila melanogaster and constructed the common ancestral sequence with high confidence, suggesting that the pattern of polymorphism within species gives useful information to know the ancestral sequence of the species.
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