arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1001.0341q-bio.GNstat.AP
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序列模体检测的权重矩阵和自由能模型研究

On Weight Matrix and Free Energy Models for Sequence Motif Detection

Qing Zhou

摘要:

模体检测的问题可以表述为构造一个判别函数来将特定模式的序列从背景中分离出来。在计算生物学中,模体检测用于预测转录因子(TF)的DNA结合位点,大多基于权重矩阵(WM)模型或吉布斯自由能(FE)模型。然而,尽管这两个模型的广泛应用,理论分析和他们的预测仍然缺乏。在不同的数据生成假设下,我们推导出基于这些模型的预测过程的渐近误差率。这允许WM为基础的和FE为基础的预测在渐近效率方面的理论比较。通过对ChIP-seq数据和蛋白质结合微阵列数据的实证研究,证明了理论结果的应用。我们发现,无论潜在的数据生成机制,FE的方法显示出较高的或相当的预测能力相对于WM的方法时,所观察到的结合位点用于构建一个判别决策的数量不太小。

英文摘要:

The problem of motif detection can be formulated as the construction of a discriminant function to separate sequences of a specific pattern from background. In computational biology, motif detection is used to predict DNA binding sites of a transcription factor (TF), mostly based on the weight matrix (WM) model or the Gibbs free energy (FE) model. However, despite the wide applications, theoretical analysis of these two models and their predictions is still lacking. We derive asymptotic error rates of prediction procedures based on these models under different data generation assumptions. This allows a theoretical comparison between the WM-based and the FE-based predictions in terms of asymptotic efficiency. Applications of the theoretical results are demonstrated with empirical studies on ChIP-seq data and protein binding microarray data. We find that, irrespective of underlying data generation mechanisms, the FE approach shows higher or comparable predictive power relative to the WM approach when the number of observed binding sites used for constructing a discriminant decision is not too small.

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