Population-genetic inference from pooled-sequencing data.

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 Evol

authors

Lynch M,Bost D,Wilson S,Maruki T,Harrison S

doi

10.1093/gbe/evu085

subject

Has Abstract

pub_date

2014-04-30 00:00:00

pages

1210-8

issue

5

issn

1759-6653

pii

evu085

journal_volume

6

pub_type

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