Gene expression drives the evolution of dominance.

Gene expression drives the evolution of dominance.
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DOI:
10.1038/s41467-018-05281-7
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发表时间:
2018-07-16
影响因子:
16.6
通讯作者:
Lohmueller KE
Lohmueller KE
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Huber CD;Durvasula A;Hancock AM;Lohmueller KE

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显性是分子遗传学中的一个基本概念,对理解遗传变异、进化和复杂性状的模式具有重要意义。然而,尽管其重要性,在自然种群中的优势程度是很难量化的。在这里,我们利用多个交配系统在自然群体中的拟南芥共同估计分布的健身效果和优势系数的新的氨基酸变化的突变。我们发现,更有害的突变更有可能是隐性的比不太有害的突变。此外,这种模式在基因类别中保持不变,但随着基因的连接和表达模式而变化。我们的工作认为,显性是基因的功能重要性及其最佳表达水平的结果。在自然种群中,优势度很难测量,因为它与适应度混淆。在这里,Huber等人开发了一种新的方法来共同估计显性和选择系数,并发现观察到的关系最适合基于基因表达水平的显性新模型。
Dominance is a fundamental concept in molecular genetics and has implications for understanding patterns of genetic variation, evolution, and complex traits. However, despite its importance, the degree of dominance in natural populations is poorly quantified. Here, we leverage multiple mating systems in natural populations of Arabidopsis to co-estimate the distribution of fitness effects and dominance coefficients of new amino acid changing mutations. We find that more deleterious mutations are more likely to be recessive than less deleterious mutations. Further, this pattern holds across gene categories, but varies with the connectivity and expression patterns of genes. Our work argues that dominance arises as a consequence of the functional importance of genes and their optimal expression levels. Dominance is difficult to measure in natural populations as it is confounded with fitness. Here, Huber et al. developed a new approach to co-estimate dominance and selection coefficients, and found that the observed relationship is best fit by a new model of dominance based on gene expression level.
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