通过表观遗传激活植物细胞全能性调节器,LEC2诱导体细胞重编程
Jing Peng1, Qi Zhang1, Li Ping Tang1
1National Key Laboratory of Wheat Improvement, College of Life Sciences, Shandong Agricultural University, Tai'an, Shandong, China.
Nature communications
|May 6, 2025
概括
在阿拉比多普西斯中过度表达叶子COTYLEDON2 (LEC2) 激活了RNA指导的DNA甲基化 (RdDM) 途径,导致CHH过甲基化. 这种表观遗传修饰增强了染色质的可访问性,并激活了体质胚胎生成的全能基因.
科学领域:
- 植物生物学 植物生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 发展生物学 发展生物学
背景情况:
- 实体胚胎生成允许植物在没有受精的情况下从体细胞中发育胚胎.
- 在这个过程中,DNA甲基化变化对于重编程体细胞至关重要.
- 连接DNA甲基化与全能性基因激活的确切机制尚不清楚.
研究的目的:
- 阐明在体质胚胎发生过程中连接DNA甲基化和全能性调节基因的激活的分子机制.
- 为了研究LEFY COTYLEDON2 (LEC2) 转录因子在这个过程中的作用.
- 建立一个框架来增强植物体质胚胎发生.
主要方法:
- 在Arabidopsis.中过度表达调节全能性的转录因子LEFY COTYLEDON2 (LEC2).
- 对DNA甲基化模式的分析,特别是CHH过甲基化.
- 研究RNA指导的DNA甲基化 (RdDM) 途径.
- 识别参与染色体修饰的蛋白质复合体,包括SU(VAR) 3-9 HOMOLOGS (SUVH),SUVH交互DNAJ域含蛋白 (SDJ) 和AT-HOOK MOTIF含核局部化 (AHL) 蛋白.
主要成果:
- 过度表达LEC2激活RdDM通路,导致CHH过甲基化在Arabidopsis.
- 一个读者复合体 (SUVH/SDJ) 与CHH高甲基化区域结合.
- 这种复合物招募AHL蛋白质,增加染色质的可访问性.
- 全能性调节基因的转录激活是这些表观遗传修饰的直接结果.
结论:
- 表观遗传修饰,特别是由RdDM途径介导的CHH过甲基化,是胚胎发生过程中体细胞重编程的关键.
- 涉及LEC2,RdDM,SUVH/SDJ和AHL蛋白质的确定的分子框架提供了对激活强度的洞察力.
- 这项研究为改善农业应用中的体质胚胎生成提供了潜在的策略.
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