阿拉比多普西斯菌种的基因素甲基化读取器MRG2与eIF4A3相互作用,调节替代拼接和昼夜节律
Yaxue Huang1, Jiabing Wu1, Xiang Li1
1State Key Laboratory of Genetics and Development of Complex Phenotypes, Institute of Plant Biology, Department of Biochemistry and Biophysics, School of Life Sciences, Fudan University, Shanghai 200438, P.R. China.
The Plant cell
|August 18, 2025
概括
与MORF相关的基因2 (MRG2) 蛋白质通过招募eIF4A3.3.通过将基因组甲基化与替代拼接联系起来. 这种相互作用调节昼夜钟基因和植物光周期反应.
科学领域:
- 分子生物学分子生物学
- 植物科学 植物科学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 替代拼接 (AS) 对于真核生物的基因调节至关重要.
- 基因组H3 lysine 36三甲基化 (H3K36me3) 影响AS,但机制尚不清楚.
- 需要阐明H3K36me3在将基因组修饰与拼接机械的联系中的作用.
研究的目的:
- 调查H3K36me3影响替代拼接的机制.
- 为了确定介导H3K36me3与拼接机械之间的相互作用的蛋白质.
- 了解这种相互作用在植物发育和环境反应中的功能意义.
主要方法:
- 酵母三混合测试检测蛋白质与蛋白质相互作用.
- 对突变表型的分析 (例如,开花时间).
- RNA测序 (RNA-seq) 用于对基因表达和AS的全转录组分析.
- RNA免疫沉测序 (RIP-seq) 用于识别RNA标.
- 染色体免疫沉 (ChIP) 评估蛋白质与染色体的结合.
主要成果:
- 与MORF相关的基因2 (MRG2),一个H3K36me3读取器,直接与eIF4A3相互作用,eIF4A3是一种表子结合复合组件.
- 缺乏eIF4A3或MRG1/MRG2的突变体在长日条件下表现出类似的晚期开花表型.
- 转录组分析揭示了eIF4A3和MRG1/MRG2删除对基因表达和AS的重叠影响,影响昼夜节律和环境反应.
- MRG1/MRG2促进eIF4A3对转录的结合,包括关键的昼夜钟基因,如PRR7和PRR9.
- eIF4A3和MRG2相互增强对方与PRR7和PRR9染色体的结合.
结论:
- MRG2 识别了 H3K36me3 标记,并招募了 eIF4A3 来调节协同转录的替代拼接事件.
- 这项研究确立了基质子修饰和植物的剪接机械之间直接的机制联系.
- MRG2-eIF4A3通路对于生理时钟基因的AS和维持适当的生理时节节律至关重要.
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