The Effect That Genotyping Errors Have on the Robustness of Common Linkage-Disequilibrium Measures
AUTOR(ES)
Akey, Joshua M.
FONTE
The American Society of Human Genetics
RESUMO
The rapid development of a dense single-nucleotide–polymorphism marker map has stimulated numerous studies attempting to characterize the magnitude and distribution of background linkage disequilibrium (LD) within and between human populations. Although genotyping errors are an inherent problem in all LD studies, there have been few systematic investigations documenting their consequences on estimates of background LD. Therefore, we derived simple deterministic formulas to investigate the effect that genotyping errors have on four commonly used LD measures—D′, r, Q, and d—in studies of background LD. We have found that genotyping error rates as small as 3% can have serious affects on these LD measures, depending on the allele frequencies and the assumed error model. Furthermore, we compared the robustness of D′, r, Q, and d, in the presence of genotyping errors. In general, Q and d are more robust than D′ and r, although exceptions do exist. Finally, through stochastic simulations, we illustrate how genotyping errors can lead to erroneous inferences when measures of LD between two samples are compared.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1226131Documentos Relacionados
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