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arXiv 1207.4145q-bio.GNcs.CEstat.ME
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从SNP序列中联合发现单倍型块和复杂性状关联

Joint discovery of haplotype blocks and complex trait associations from SNP sequences

Nebojsa Jojic, Vladimir Jojic, David Heckerman

摘要:

单倍型是DNA序列变异的全局模式,对识别复杂性状具有重要意义。最近,在人类染色体中发现了有限的单倍型多样性块,加强了对这些块中的等位基因的块结构以及转换或共现的建模的研究,作为压缩变异性和更稳健地推断关联的一种方式。单倍型块结构分析通常由于每个SNP的相位信息缺失的事实而复杂化,即,观察到的等位基因对在整个序列中不是以一致的顺序给出的。规避这一点的技术需要额外的信息,如家庭数据,或更复杂的测序程序。在本文中,我们提出了一个分层统计模型和相关的学习和推理算法,同时处理每个位点的等位基因模糊性,缺失数据,块估计,和复杂的性状关联。虽然blo结构可能不同于通过其他方法推断的结构,这些方法使用系谱信息或先前已知的等位基因,但我们估计的参数,包括学习的块结构和估计的每个基因座的块转换,定义了集合中变异性的良好模型。该方法是完全数据驱动的,可以从人类染色体5q31的SNP数据中检测Chron病,检测率为80%,误差方差较小。

英文摘要:

Haplotypes, the global patterns of DNA sequence variation, have important implications for identifying complex traits. Recently, blocks of limited haplotype diversity have been discovered in human chromosomes, intensifying the research on modelling the block structure as well as the transitions or co-occurrence of the alleles in these blocks as a way to compress the variability and infer the associations more robustly. The haplotype block structure analysis is typically complicated by the fact that the phase information for each SNP is missing, i.e., the observed allele pairs are not given in a consistent order across the sequence. The techniques for circumventing this require additional information, such as family data, or a more complex sequencing procedure. In this paper we present a hierarchical statistical model and the associated learning and inference algorithms that simultaneously deal with the allele ambiguity per locus, missing data, block estimation, and the complex trait association. While the blo structure may differ from the structures inferred by other methods, which use the pedigree information or previously known alleles, the parameters we estimate, including the learned block structure and the estimated block transitions per locus, define a good model of variability in the set. The method is completely datadriven and can detect Chron's disease from the SNP data taken from the human chromosome 5q31 with the detection rate of 80% and a small error variance.

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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