Detecting directional selection in the presence of recent admixture in African-Americans

Genetics
Kirk E LohmuellerAndrew G Clark

Abstract

We investigate the performance of tests of neutrality in admixed populations using plausible demographic models for African-American history as well as resequencing data from African and African-American populations. The analysis of both simulated and human resequencing data suggests that recent admixture does not result in an excess of false-positive results for neutrality tests based on the frequency spectrum after accounting for the population growth in the parental African population. Furthermore, when simulating positive selection, Tajima's D, Fu and Li's D, and haplotype homozygosity have lower power to detect population-specific selection using individuals sampled from the admixed population than from the nonadmixed population. Fay and Wu's H test, however, has more power to detect selection using individuals from the admixed population than from the nonadmixed population, especially when the selective sweep ended long ago. Our results have implications for interpreting recent genome-wide scans for positive selection in human populations.

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Related Concepts

African American
In Silico
Population Spatial Distribution
Genetic Polymorphism
Selection, Genetic
Evolution, Neutral
African Continental Ancestry Group
Fluorouracil
Genome
Laboratory Procedures

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