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arXiv 1503.04992q-bio.GN
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用于转录因子之间结合强度比较的位置权重矩阵的可靠缩放

Reliable scaling of Position Weight Matrices for binding strength comparisons between transcription factors

Xiaoyan Ma, Daphne Ezer, Carmen Navarro, Boris Adryan

摘要:

针对位置权重矩阵(PWMs)对DNA序列进行评分是广泛采用的用于鉴定推定的转录因子结合位点的方法。虽然常见的生物信息学工具产生的分数可以反映特定转录因子和DNA之间的结合强度,但这些分数在不同的转录因子之间不能直接比较。在这里,我们提供了两种不同的方法来找到缩放参数$λ$,使我们能够从PWM分数推断结合能。第一种方法使用PWM和背景基因组序列作为输入来估计特定转录因子的$λ$,我们应用该方法来显示不同转录因子家族的$λ$分布与它们的DNA结合特性相对应。我们的第二种方法可以在相同转录因子的不同PWM之间可靠地转换$λ$,这允许我们直接比较由不同方法产生的PWM。这两种方法提供了一致的和计算有效的方法来缩放PWM分数和估计转录因子结合位点强度。

英文摘要:

Scoring DNA sequences against Position Weight Matrices (PWMs) is a widely adopted method to identify putative transcription factor binding sites. While common bioinformatics tools produce scores that can reflect the binding strength between a specific transcription factor and the DNA, these scores are not directly comparable between different transcription factors. Here, we provide two different ways to find the scaling parameter $λ$ that allows us to infer binding energy from a PWM score. The first approach uses a PWM and background genomic sequence as input to estimate $λ$ for a specific transcription factor, which we applied to show that $λ$ distributions for different transcription factor families correspond with their DNA binding properties. Our second method can reliably convert $λ$ between different PWMs of the same transcription factor, which allows us to directly compare PWMs that were generated by different approaches. These two approaches provide consistent and computationally efficient ways to scale PWMs scores and estimate transcription factor binding sites strength.

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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