arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1302.5589stat.ME
收藏

寻找变距马尔可夫随机场的基本邻域:在SNP关联研究中的应用

Finding the basic neighborhood in variable range Markov random fields: application in SNP association studies

André J. Bianchi, Suely R. Giolo, Júlia P. Soler, Florencia Leonardi

摘要:

单核苷酸多态性(SNPs)基因分型平台对复杂疾病的基因定位具有重要价值。如今,这些分子标记的高密度使得能够研究基因组上的基因座之间的依赖模式,允许同时推断依赖结构和疾病关联。在本文中,我们提出了一种方法的可变范围马尔可夫随机场理论的基础上,以估计的SNPs之间的依赖程度,允许沿基因组的可变窗口。这种方法的优点是,它允许同时预测SNP之间的依赖和独立区域,而不限制先验的依赖范围。我们引入了一个基于惩罚极大似然思想的估计器来寻找样本中每个SNP的条件依赖邻域,并证明了它的一致性。我们将我们的方法应用于病例对照关联研究中具有未知阶段的常染色体SNPs基因型数据。通过检查类风湿性关节炎的遗传分析研讨会16(GAW16)的数据,我们显示了可变范围依赖下的马尔可夫模型的实用性。

英文摘要:

The SNPs (Single Nucleotide Polymorphisms) genotyping platforms are of great value for gene mapping of complex diseases. Nowadays, the high-density of these molecular markers enables studies of dependence patterns between loci over the genome, allowing a simultaneous inference of dependence structure and disease association. In this paper we propose a method based on the theory of variable range Markov random fields to estimate the extent of dependence among SNPs allowing variable windows along the genome. The advantage of this method is that it allows the simultaneous prediction of dependence and independence regions among SNPs, without restricting a priori the range of dependence. We introduce an estimator based on the idea of penalized maximum likelihood to find the conditional dependence neighborhood of each SNP in the sample and we prove its consistency. We apply our method to autosomal SNPs genotypic data with unknown phase in the context of case-control association studies. By examining rheumatoid arthritis data from the Genetic Analysis Workshop 16 (GAW16), we show the utility of the Markov model under variable range dependence.

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。

↑