Targeted DNA demethylation and activation of endogenous genes using programmable TALE-TET1 fusion proteins.

Targeted DNA demethylation and activation of endogenous genes using programmable TALE-TET1 fusion proteins.
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DOI:
10.1038/nbt.2726
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发表时间:
2013-12
影响因子:
46.9
通讯作者:
--
中科院分区:
工程技术1区
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--
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全基因组研究已经确定了细胞类型特异性的DNA甲基化模式,这对调节正常发育和疾病中的基因表达至关重要。然而,确定特定甲基化事件的功能意义仍然具有挑战性,因为缺乏以靶向方式去除此类修饰的方法。在这里,我们描述了一种方法,在人类细胞中使用工程化的转录激活因子样效应子(TALE)重复序列和TET 1羟化酶催化结构域的融合,有效地靶向特定的CpG去甲基化。使用这些TALE-TET 1融合,我们证明了关键甲基化启动子CpG位置的修饰可以导致内源性人类基因表达的大幅增加。我们的研究结果描绘了一个战略,了解特定的CpG甲基化标记的内源性基因位点的背景下的功能意义,并验证可编程的DNA去甲基化试剂的研究和治疗应用的潜在效用。
Genome-wide studies have defined cell type–specific patterns of DNA methylation that are important for regulating gene expression in both normal development and disease. However, determining the functional significance of specific methylation events remains challenging, owing to the lack of methods for removing such modifications in a targeted manner. Here we describe an approach for efficient targeted demethylation of specific CpGs in human cells using fusions of engineered transcription activator–like effector (TALE) repeat arrays and the TET1 hydroxylase catalytic domain. Using these TALE-TET1 fusions, we demonstrate that modification of critical methylated promoter CpG positions can lead to substantial increases in the expression of endogenous human genes. Our results delineate a strategy for understanding the functional significance of specific CpG methylation marks in the context of endogenous gene loci and validate programmable DNA demethylation reagents with potential utility for research and therapeutic applications.
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