Inferring the distributions of fitness effects and proportions of strongly deleterious mutations
Inferring the distributions of fitness effects and proportions of strongly deleterious mutations
复制标题
推断适应度效应的分布和强有害突变的比例
DOI:
10.1101/2022.11.16.516724
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Charmouh A
中科院分区:
文献类型:
--
作者:
Charmouh A
The distribution of fitness effects is a key property in evolutionary genetics as it has implications for several evolutionary phenomena including the evolution of sex and mating systems, the rate of adaptive evolution, and the prevalence of deleterious mutations. Despite the distribution of fitness effects being extensively studied, the effects of strongly deleterious mutations are difficult to infer since such mutations are unlikely to be present in a sample of haplotypes, so genetic data may contain very little information about them. Recent work has attempted to correct for this issue by expanding the classic gamma-distributed model to explicitly account for strongly deleterious mutations. Here, we use simulations to investigate one such method, adding a parameterto capture the proportion of strongly deleterious mutations. We show thatcan improve the model fit when applied to individual species but underestimates the true proportion of strongly deleterious mutations. The parameter can also artificially maximize the likelihood when used to jointly infer a distribution of fitness effects from multiple species. Asand related parameters are used in current inference algorithms, our results are relevant with respect to avoiding model artifacts and improving future tools for inferring the distribution of fitness effects.
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DOI:
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