Robust detection of natural selection using a probabilistic model of tree imbalance
Robust detection of natural selection using a probabilistic model of tree imbalance
复制标题
使用树木不平衡的概率模型稳健地检测自然选择
DOI:
10.1093/genetics/iyac009
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发表时间:
2022
期刊:
影响因子:
3.3
通讯作者:
Gravel, ed., S.
中科院分区:
文献类型:
--
作者:
Dilber, Enes;Terhorst, Jonathan;Gravel, ed., S.
Neutrality tests such as Tajima’sDand Fay and Wu’sHare standard implements in the population genetics toolbox. One of their most common uses is to scan the genome for signals of natural selection. However, it is well understood thatDandHare confounded by other evolutionary forces—in particular, population expansion—that may be unrelated to selection. Because they are not model-based, it is not clear how to deconfound these tests in a principled way. In this article, we derive new likelihood-based methods for detecting natural selection, which are robust to fluctuations in effective population size. At the core of our method is a novel probabilistic model of tree imbalance, which generalizes Kingman’s coalescent to allow certain aberrant tree topologies to arise more frequently than is expected under neutrality. We derive a frequency spectrum-based estimator that can be used in place ofD, and also extend to the case where genealogies are first estimated. We benchmark our methods on real and simulated data, and provide an open source software implementation.
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通讯作者:
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