Dominance of Deleterious Alleles Controls the Response to a Population Bottleneck

PLoS Genetics
Daniel J BalickShamil R Sunyaev

Abstract

Population bottlenecks followed by re-expansions have been common throughout history of many populations. The response of alleles under selection to such demographic perturbations has been a subject of great interest in population genetics. On the basis of theoretical analysis and computer simulations, we suggest that this response qualitatively depends on dominance. The number of dominant or additive deleterious alleles per haploid genome is expected to be slightly increased following the bottleneck and re-expansion. In contrast, the number of completely or partially recessive alleles should be sharply reduced. Changes of population size expose differences between recessive and additive selection, potentially providing insight into the prevalence of dominance in natural populations. Specifically, we use a simple statistic, [Formula: see text], where xi represents the derived allele frequency, to compare the number of mutations in different populations, and detail its functional dependence on the strength of selection and the intensity of the population bottleneck. We also provide empirical evidence showing that gene sets associated with autosomal recessive disease in humans may have a BR indicative of recessive selection. Toge...Continue Reading

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Citations

Feb 15, 2016·Trends in Genetics : TIG·Yaniv Brandvain, Stephen I Wright
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Jan 23, 2021·Molecular Biology and Evolution·Margarita TakouJuliette de Meaux
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May 28, 2021·Molecular Biology and Evolution·Xin HuangRyan N Gutenkunst

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Methods Mentioned

BETA
Exome Sequencing

Software Mentioned

PolyPhen2
BELOW
ESP

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