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 [Formula: see text] (where N is the number of individuals sampled) appear to be unachievable, and near-certain identification of a polymorphism requires a minor-allele frequency [Formula: see text]. 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.
journal_name
Genome Biol Evoljournal_title
Genome biology and evolutionauthors
Lynch M,Bost D,Wilson S,Maruki T,Harrison Sdoi
10.1093/gbe/evu085subject
Has Abstractpub_date
2014-04-30 00:00:00pages
1210-8issue
5issn
1759-6653pii
evu085journal_volume
6pub_type
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