Population-genetic inference from pooled-sequencing data

Michael Lynch, Darius Bost, Sade Wilson, Takahiro Maruki, Scott Harrison

Research output: Contribution to journalArticle

43 Scopus citations

Abstract

Although pooled-population sequencing has become a widely used approach for estimating allele frequencies, most work has proceeded in the absence of a proper statistical framework. We introduce a self-sufficient, closed-form, maximum-likelihood estimator for allele frequencies that accounts for errors associated with sequencing, and a likelihood-ratio test statistic that provides a simple means for evaluating the null hypothesis of monomorphism. Unbiased estimates of allele frequencies < 5/N (where N is the number of individuals sampled) appear to be unachievable, and near-certain identification of a polymorphism requires a minor-allele frequency> 10/N. A framework is provided for testing for significant differences in allele frequencies between populations, taking into account sampling at the levels of individuals within populations and sequences within pooled samples. Analyses that fail to account for the two tiers of sampling suffer from very large false-positive rates and can become increasingly misleading with increasing depths of sequence coverage. The power to detect significant allele-frequency differences between two populations is very limited unless both the number of sampled individuals and depth of sequencing coverage exceed 100.

Original languageEnglish (US)
Pages (from-to)1210-1218
Number of pages9
JournalGenome Biology and Evolution
Volume6
Issue number5
DOIs
StatePublished - Jan 1 2014
Externally publishedYes

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Keywords

  • Allele-frequency estimation
  • Population genomics
  • Population subdivision

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics

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