Genetics, Vol. 155, 1405-1413, July 2000, Copyright © 2000

Hitchhiking Under Positive Darwinian Selection

Justin C. Faya and Chung-I Wua,b
a Committee on Genetics, University of Chicago, Chicago, Illinois 60637
b Department of Ecology and Evolution, University of Chicago, Chicago, Illinois 60637

Corresponding author: Chung-I Wu, Department of Ecology and Evolution, University of Chicago, 1101 E. 57th St., Chicago, IL 60637., ciwu{at}uchicago.edu (E-mail)

Communicating editor: W. STEPHAN

Positive selection can be inferred from its effect on linked neutral variation. In the restrictive case when there is no recombination, all linked variation is removed. If recombination is present but rare, both deterministic and stochastic models of positive selection show that linked variation hitchhikes to either low or high frequencies. While the frequency distribution of variation can be influenced by a number of evolutionary processes, an excess of derived variants at high frequency is a unique pattern produced by hitchhiking (derived refers to the nonancestral state as determined from an outgroup). We adopt a statistic, H, to measure an excess of high compared to intermediate frequency variants. Only a few high-frequency variants are needed to detect hitchhiking since not many are expected under neutrality. This is of particular utility in regions of low recombination where there is not much variation and in regions of normal or high recombination, where the hitchhiking effect can be limited to a small (<1 kb) region. Application of the H test to published surveys of Drosophila variation reveals an excess of high frequency variants that are likely to have been influenced by positive selection.




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