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arXiv 2002.06401q-bio.GN
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增强子间协同作用诱导的DNA甲基化异质性

DNA methylation heterogeneity induced by collaborations between enhancers

Yusong Ye, Zhuoqin Yang, Jinzhi Lei

摘要:

在哺乳动物胚胎发育过程中,DNA甲基化重编程在消除亲代表观遗传记忆和建立幼稚多能细胞中起着重要作用。调节甲基化和去甲基化过程的多种酶共同作用以形成基因组规模的DNA甲基化模式并指导细胞分化的过程。最近从单细胞全基因组亚硫酸氢盐测序(scBS-seq)获得的甲基化组信息的可用性为研究单个细胞中全基因组的DNA甲基化动态提供了机会,其揭示了胚胎干细胞(ESC)中增强子的异质性甲基化分布。在这项研究中,我们开发了一个增强子甲基化遗传的计算模型,以研究退出多能性过程中基因组规模的DNA甲基化重编程的动力学。该模型使我们能够在胚胎发育过程中在单细胞水平上跟踪基因组规模的DNA甲基化重编程,并重现scBS-seq报告的DNA甲基化异质性。模型模拟表明,DNA甲基化异质性是发育过程中由细胞分裂驱动的内在属性,异质性甲基化需要相邻增强子之间的协作。我们的研究表明,Rulands等人(2018)提出的基因组规模振荡机制可能不是退出多能性过程中DNA甲基化所必需的。

英文摘要:

During mammalian embryo development, reprogramming of DNA methylation plays important roles in the erasure of parental epigenetic memory and the establishment of naïve pluripogent cells. Multiple enzymes that regulate the processes of methylation and demethylation work together to shape the pattern of genome-scale DNA methylation and guid the process of cell differentiation. Recent availability of methylome information from single-cell whole genome bisulfite sequencing (scBS-seq) provides an opportunity to study DNA methylation dynamics in the whole genome in individual cells, which reveal the heterogeneous methylation distributions of enhancers in embryo stem cells (ESCs). In this study, we developed a computational model of enhancer methylation inheritance to study the dynamics of genome-scale DNA methylation reprogramming during exit from pluripotency. The model enables us to track genome-scale DNA methylation reprogramming at single-cell level during the embryo development process, and reproduce the DNA methylation heterogeneity reported by scBS-seq. Model simulations show that DNA methylation heterogeneity is an intrinsic property driven by cell division along the development process, and the collaboration between neighboring enhancers is required for heterogeneous methylation. Our study suggest that the mechanism of genome-scale oscillation proposed by Rulands et al. (2018) might not necessary to the DNA methylation during exit from pluripotency.

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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