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arXiv 1002.1600q-bio.MN
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后生景观的稳定性和调节理论

Theory for stability and regulation of epigenetic landscapes

Mille A. Micheelsen, Namiko Mitarai, Kim Sneppen, Ian. B. Dodd

摘要:

细胞通常可以在几种稳定遗传的表型中进行选择。实例是真核细胞中基因的表达,其中长染色体区域可以采用持久和可遗传的沉默或活性状态,这可能与核小体动态修饰中的正反馈相关。我们概括了这种机制的双稳态与山谷中的后生景观。使用转移矩阵方法严格跟踪系统的细胞分裂破坏过程。这种噪声动力学之间和细胞分裂期间的组合治疗提供了一种有效的方法来计算在广泛的表观遗传系统中的替代状态的稳定性。

英文摘要:

Cells can often choose among several stably heritable phenotypes. Examples are the expression of genes in eukaryotic cells where long chromosomal regions can adopt persistent and heritable silenced or active states, that may be associated with positive feedback in dynamic modification of nucleosomes. We generalize this mechanism in terms of bistability associated with valleys in an epigenetic landscape. A transfer matrix method was used to rigorously follow the system through the disruptive process of cell division. This combined treatment of noisy dynamics both between and during cell division provides an efficient way to calculate the stability of alternative states in a broad range of epigenetic systems.

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