在活体中编辑DNA甲基化
Richard Pan1, Jingwei Ren1, Xinyue Chen1
1Department of Physiology and Cellular Biophysics, Columbia University Irving Medical Center, Columbia University, New York City, NY, USA.
Nature communications
|December 10, 2025
概括
研究人员开发了新的小鼠模型,用于精确的体内DNA甲基化编辑. 这种技术成功地改变了基因表达,影响了胆固醇水平,并拯救了神经疾病,显示了表观遗传学研究的前景.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 基因甲基化是基因表达的关键表观遗传调节剂.
- 目前的DNA甲基化编辑工具在很大程度上仅限于体外应用,因为交付挑战.
研究的目的:
- 开发和验证一种可诱导,组织特异的DNA甲基化编辑系统.
- 为了证明向DNA甲基化和脱甲基化在生物体中的功能后果.
主要方法:
- 产生表达可诱导dCas9-DNMT3A (用于甲基化) 和dCas9-TET1 (用于脱甲基化) 编辑器的转基因小鼠线.
- 在体内对特定基因促进体 (Psck9 和 Mecp2) 进行有针对性的表观遗传编辑.
- 通过测序评估基因表达变化,生理结果 (血清胆固醇,神经元形态),以及全基因组的非目标效应.
主要成果:
- 在dCas9-DNMT3A小鼠中,Psck9促进体的向甲基化减少了Pcsk9的表达,并降低了血清LDL胆固醇.
- 在dCas9-TET1小鼠中对Mecp2促进体的向去甲基化重新激活了X染色体表达,并在Mecp2+/-小鼠中挽救了神经元缺陷.
- 全基因组分析证实了最小的转录异位效应,突出显示了该系统的特异性.
结论:
- 开发的基于dCas9的可诱导编辑器可以在体内进行精确和组织特定的DNA甲基化编辑.
- 这项技术提供了一个多功能平台,用于在复杂的生物过程和疾病模型中询问DNA甲基化在复杂生物过程和疾病模型中的功能作用.
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