arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0904.2229stat.ME
收藏

揭示在多个特征中捕获的复杂疾病的各个方面的共同遗传风险因素

Uncovering shared common genetic risk factors for various aspects of complex disorders captured in multiple traits

Summer S. Han, Elena L. Grigorenko, Joseph T. Chang

摘要:

识别多个测量特征的共享遗传风险因素在研究复杂疾病中具有极大的兴趣。Marlow(2003)检测复杂性状的共有基因效应的方法在神经发育障碍以及包括肥胖和哮喘在内的其他疾病的文献中具有很大的影响力。虽然它的方法已被广泛应用,并已被推荐为潜在的强大的,这种方法的有效性和权力还没有被检验,无论是理论上还是通过模拟。本文建立了有效性和量化,并解释了该方法的力量。我们表明,无论模型中的性状数量如何,该方法都具有正确的1型错误率,并且与不同遗传模型的标准单变量方法相比,证实了功效增加。我们发现,这些权力增益的主要来源是由一个共同的主基因效应成分引起的性状之间的相关性。我们比较使用的完整的多效性模型,假设马洛,使用一个更一般的模型,允许额外的相关参数,并发现,即使当真正的模型包括这些参数,完整的多效性模型是更强大的,只要性状适度相关的主要基因成分。我们在软件中实现了这种方法和功效计算器,该软件可以通过使用试点数据来计算所需的样本量并选择性状进行进一步的连锁研究来帮助设计研究。我们将该软件应用于俄语阅读障碍的数据。

英文摘要:

Identifying shared genetic risk factors for multiple measured traits has been of great interest in studying complex disorders. Marlow's (2003) method for detecting shared gene effects on complex traits has been highly influential in the literature of neurodevelopmental disorders as well as other disorders including obesity and asthma. Although its method has been widely applied and has been recommended as potentially powerful, the validity and power of this method have not been examined either theoretically or by simulation. This paper establishes the validity and quantifies and explains the power of the method. We show the method has correct type 1 error rates regardless of the number of traits in the model, and confirm power increases compared to standard univariate methods across different genetic models. We discover the main source of these power gains is correlations among traits induced by a common major gene effect component. We compare the use of the complete pleiotropy model, as assumed by Marlow, to the use of a more general model allowing additional correlation parameters, and find that even when the true model includes those parameters, the complete pleiotropy model is more powerful as long as traits are moderately correlated by a major gene component. We implement this method and a power calculator in software that can assist in designing studies by using pilot data to calculate required sample sizes and choose traits for further linkage studies. We apply the software to data on reading disability in the Russian language.

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。

↑