独特的调节途径有助于动态的CHH甲基化模式在可转移元素在整个胚胎发生过程中
Jaehoon Lee1,2, Seunga Lee1,2, Kyunghyuk Park1
1Department of Biological Sciences, Seoul National University, Seoul, Republic of Korea.
Frontiers in plant science
|June 26, 2023
概括
在植物胚胎发生过程中,DNA甲基化 (mCHH) 增加,涉及小RNA依赖的DNA甲基化 (RdDM) 和RNA独立的染色甲基酶2 (CMT2) 途径. 这项研究揭示了转子子特征如何影响发育过程中的表观遗传调节.
科学领域:
- 植物表观遗传学植物表观遗传学
- 发展生物学 发展生物学
- 基因组学就是基因组学.
背景情况:
- 在CHH序列上下文 (mCHH) 中的细胞因子甲基化在植物胚胎发生过程中增加,这表明保留了表观遗传调节.
- 虽然增加的mCHH与可转移元素沉默有关,但精确的表观遗传途径仍然不清楚.
- 在Arabidopsis中,mCHH由小型RNA依赖的DNA甲基化 (RdDM) 和RNA独立的染色甲基酶2 (CMT2) 途径控制.
研究的目的:
- 为了研究调节mCHH动态的表观遗传通路在阿拉比多普西斯胚胎发生过程中.
- 根据它们对RdDM和CMT2路径的依赖性来分类mCHH区域.
- 了解可转移元素特征如何影响发育过程中的表观遗传向.
主要方法:
- 在阿拉比多普西斯胚胎发生的五个阶段进行了DNA甲基形状分析.
- 根据它们对甲基化途径 (RdDM和CMT2) 的差异依赖性对mCHH区域进行分类.
- 分析了转子子特征 (长度,位置,细胞因子频率) 和mCHH调节之间的关系.
主要成果:
- 在胚胎发生过程中观察到mCHH的逐渐增加,与扩大小RNA表达和区域mCHH传播相关.
- 鉴定了不同目标区域的独特的mCHH动态,受转位子特征的影响.
- 发现在胚胎发生过程中,具有较低mCHG水平的短,异色色TE从CMT2转换为RdDM调节.
结论:
- 转子子特征和mCHH机制之间的相互作用在植物胚胎发生过程中调节表观遗传动力学.
- mCHH的发育调节涉及RdDM和CMT2通路之间的复杂相互作用,受TE特性的影响.
- 这项研究提供了关于精确的表观遗传机制的见解,这些机制控制了胚胎发育期间的转子子沉默.
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