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arXiv 1402.5447q-bio.GNstat.AP
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转化表型的遗传分析

Genetic Analysis of Transformed Phenotypes

Nicolo Fusi, Christoph Lippert, Neil D. Lawrence, Oliver Stegle

摘要:

线性混合模型(Linear mixed models,LMRM)是研究基因型-表型关系的一种有效工具。一个限制性的假设是残差是高斯分布的,这一要求在实践中很少成立。违反这一假设可能导致错误的结论和功率损失,因此通常的做法是预处理表型值以使其成为高斯,例如通过应用对数或其他非线性变换。不幸的是,不同的表型需要不同的特定转化,并且选择“好的”转化通常具有挑战性和主观性。在这里,我们提出了一个扩展的LMM估计从观察到的数据的最佳转换。在对来自人类、小鼠和酵母的真实数据的广泛模拟和应用中,我们表明,使用这种最佳转换可以提高全基因组关联研究的能力,提高遗传力估计和表型预测的准确性。

英文摘要:

Linear mixed models (LMMs) are a powerful and established tool for studying genotype-phenotype relationships. A limiting assumption of LMMs is that the residuals are Gaussian distributed, a requirement that rarely holds in practice. Violations of this assumption can lead to false conclusions and losses in power, and hence it is common practice to pre-process the phenotypic values to make them Gaussian, for instance by applying logarithmic or other non-linear transformations. Unfortunately, different phenotypes require different specific transformations, and choosing a "good" transformation is in general challenging and subjective. Here, we present an extension of the LMM that estimates an optimal transformation from the observed data. In extensive simulations and applications to real data from human, mouse and yeast we show that using such optimal transformations lead to increased power in genome-wide association studies and higher accuracy in heritability estimates and phenotype predictions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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