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arXiv 1901.06286q-bio.GN
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DNA甲基化反应动力学的混合HMM方法

A Hybrid HMM Approach for the Dynamics of DNA Methylation

Charalampos Kyriakopoulos, Pascal Giehr, Alexander Lück, Jörn Walter, Verena Wolf

摘要:

了解控制表观遗传变化的机制是现代功能生物学的一个重要研究领域。表观遗传修饰如DNA甲基化一般在许多细胞分裂中非常稳定。然而,DNA甲基化可以在短时间内发生特异性和快速的变化,即使在非分裂(即非复制)细胞中也是如此。这种动态DNA甲基化变化是由主动去甲基化和从头甲基化过程的组合引起的,这在整合模型中尚未研究。在这里,我们提出了一个混合(隐)马尔可夫模型来描述(短)时间尺度上的甲基化和去甲基化的循环。我们的混合模型描述了几个分子事件发生在确定性点(即描述机制,仅发生在细胞分裂)和其他事件发生在随机时间点。我们使用时间分辨数据在小鼠胚胎干细胞上测试我们的模型。我们预测甲基化变化,并估计与DNA甲基化和去甲基化相关的不同修饰步骤的效率。

英文摘要:

The understanding of mechanisms that control epigenetic changes is an important research area in modern functional biology. Epigenetic modifications such as DNA methylation are in general very stable over many cell divisions. DNA methylation can however be subject to specific and fast changes over a short time scale even in non-dividing (i.e. not-replicating) cells. Such dynamic DNA methylation changes are caused by a combination of active demethylation and de novo methylation processes which have not been investigated in integrated models. Here we present a hybrid (hidden) Markov model to describe the cycle of methylation and demethylation over (short) time scales. Our hybrid model decribes several molecular events either happening at deterministic points (i.e. describing mechanisms that occur only during cell division) and other events occurring at random time points. We test our model on mouse embryonic stem cells using time-resolved data. We predict methylation changes and estimate the efficiencies of the different modification steps related to DNA methylation and demethylation.

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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