Statistical tests for detecting positive selection by utilizing high-frequency variants

Genetics
Kai ZengChung-I Wu

Abstract

By comparing the low-, intermediate-, and high-frequency parts of the frequency spectrum, we gain information on the evolutionary forces that influence the pattern of polymorphism in population samples. We emphasize the high-frequency variants on which positive selection and negative (background) selection exhibit different effects. We propose a new estimator of theta (the product of effective population size and neutral mutation rate), thetaL, which is sensitive to the changes in high-frequency variants. The new thetaL allows us to revise Fay and Wu's H-test by normalization. To complement the existing statistics (the H-test and Tajima's D-test), we propose a new test, E, which relies on the difference between thetaL and Watterson's thetaW. We show that this test is most powerful in detecting the recovery phase after the loss of genetic diversity, which includes the postselective sweep phase. The sensitivities of these tests to (or robustness against) background selection and demographic changes are also considered. Overall, D and H in combination can be most effective in detecting positive selection while being insensitive to other perturbations. We thus propose a joint test, referred to as the DH test. Simulations indicate t...Continue Reading

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Related Concepts

In Silico
Genetic Polymorphism
Selection, Genetic
Variation (Genetics)
Two-Parameter Models

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