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SnIPRE: Selection Inference Using a Poisson Random Effects Model

Author

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  • Kirsten E Eilertson
  • James G Booth
  • Carlos D Bustamante

Abstract

We present an approach for identifying genes under natural selection using polymorphism and divergence data from synonymous and non-synonymous sites within genes. A generalized linear mixed model is used to model the genome-wide variability among categories of mutations and estimate its functional consequence. We demonstrate how the model's estimated fixed and random effects can be used to identify genes under selection. The parameter estimates from our generalized linear model can be transformed to yield population genetic parameter estimates for quantities including the average selection coefficient for new mutations at a locus, the synonymous and non-synynomous mutation rates, and species divergence times. Furthermore, our approach incorporates stochastic variation due to the evolutionary process and can be fit using standard statistical software. The model is fit in both the empirical Bayes and Bayesian settings using the lme4 package in R, and Markov chain Monte Carlo methods in WinBUGS. Using simulated data we compare our method to existing approaches for detecting genes under selection: the McDonald-Kreitman test, and two versions of the Poisson random field based method MKprf. Overall, we find our method universally outperforms existing methods for detecting genes subject to selection using polymorphism and divergence data. Author Summary: We present a new methodology, SnIPRE, for identifying genes under natural selection. SnIPRE is a “McDonald-Kreitman” type of analysis, in that it is based on MK table data and has an advantage over other types of statistics because it is robust to demography. Similar to the MKprf method, SnIPRE makes use of genome-wide information to increase power, but is non-parametric in the sense that it makes no assumptions (and does not require estimation) of parameters such as mutation rate and species divergence time in order to identify genes under selection. In simulations SnIPRE outperforms both the MK statistic and the two versions of MKprf considered. We then apply our method to Drosophila and human-chimp data.

Suggested Citation

  • Kirsten E Eilertson & James G Booth & Carlos D Bustamante, 2012. "SnIPRE: Selection Inference Using a Poisson Random Effects Model," PLOS Computational Biology, Public Library of Science, vol. 8(12), pages 1-14, December.
  • Handle: RePEc:plo:pcbi00:1002806
    DOI: 10.1371/journal.pcbi.1002806
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    References listed on IDEAS

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    1. Xiao Feng & Qipian Chen & Weihong Wu & Jiexin Wang & Guohong Li & Shaohua Xu & Shao Shao & Min Liu & Cairong Zhong & Chung-I Wu & Suhua Shi & Ziwen He, 2024. "Genomic evidence for rediploidization and adaptive evolution following the whole-genome triplication," Nature Communications, Nature, vol. 15(1), pages 1-15, December.

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