在花粉中调节基因表达的对抗性表观遗传机制通过单核多组学揭示
Colette L Picard1, Lucia Ichino1,2, Tyler J Buckley1,2
1Department of Molecular, Cell and Developmental Biology, University of California Los Angeles, Los Angeles, CA, USA.
Nature communications
|November 27, 2025
概括
阿拉比多普西斯的MBD5/6蛋白抑制了花粉植物核 (VN) 中的甲基化DNA. 丢失MBD7可挽救转录缺陷,揭示MBD7在脱甲基和基因激活中的作用.
科学领域:
- 植物分子生物学 植物分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 基因调节 基因调节
背景情况:
- 阿拉比多普西斯MBD5,MBD6和MBD7是CG特有的甲基读取器.
- MBD5和MBD6 (MBD5/6) 抑制了花粉植物核 (VN) 中的甲基化位点.
- MBD7防止了转基因沉默,可能是通过DNA脱甲基化.
研究的目的:
- 研究MBD5/6和MBD7在VN中调节基因表达的相互作用.
- 确定MBD7在MBD5/6突变体中观察到的转录缺陷中的作用.
- 阐明VN中DNA甲基化和脱甲基化的机制.
主要方法:
- 在单个花粉核中同时对DNA甲基化和转录进行分析.
- 对突变系 (mbd5/6,mbd7) 和宫外MBD7招募的分析.
- 结合MBD7与脱甲基和转录变化的相关性.
主要成果:
- 丢失MBD7可以在MBD5/6-绑定位点的子集中恢复转录缺陷.
- 在VN中经过脱甲基化的MBD5 / 6结合的位点在mbd5 / 6突变体中显示进一步的脱甲基化,在转录脱压之前.
- 结合MBD7与mbd5/6突变体中的脱甲基化和转录脱压相关,由于MBD7的丧失,效应被逆转.
结论:
- 维护VN中的沉默部分通过抑制MBD7介导的活性脱甲基化.
- 在VN成熟过程中,MBD7复合物在特定的位置促进DNA脱甲基和转录激活.
- MBD蛋白之间的动态相互作用调节了花粉发育中的表观遗传沉默和基因表达.
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