在MBD-ACDDNA甲基化阅读器复合体中,MICRORCHIDIA6被用于调节Arabidopsis中的核糖体RNA基因表达
Zhitong Ren1,2,3, Runyu Gou4, Wanqing Zhuo4
1National Key Laboratory of Wheat Improvement, Shandong Laboratory of Advanced Agriculture Sciences in Weifang, Peking University Institute of advanced Agricultural Sciences, Weifang, Shandong 261325, China.
The Plant cell
|December 13, 2023
概括
研究人员在Arabidopsis中发现了一种蛋白质复合物,该复合物读取DNA甲基化以控制特定的45S核糖体RNA (rRNA) 基因表达. 这种复合体包括MBD5,MBD6,ACD15.5和ACD21.4,它调节了基因沉默和激活.
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.
- 植物分子生物学 植物分子生物学
- 基因法规 基因法规
背景情况:
- 基因甲基化是影响基因表达的关键表观遗传机制.
- 读取DNA甲基化和控制核糖体RNA (rRNA) 基因表达的特定蛋白质在很大程度上是未知的.
- 了解这些读者和效应器对于破译基因调节途径至关重要.
研究的目的:
- 鉴定和描述负责读取DNA甲基化和调节Arabidopsis中变异特异的45SrRNA基因表达的蛋白质复合体.
- 阐明该复合体控制不同45S rRNA基因变异激活和沉默的机制.
主要方法:
- 蛋白质复合体的净化和识别.
- 用DNA结合测试来确认与45SrDNA的相互作用.
- 在体外和体内分相分离实验.
- 与效应蛋白的相互作用研究,包括MICRORCHIDIA6.
- 在Arabidopsis突变物中对rRNA基因表达的分析.
主要成果:
- 一种由甲基-CpG结合域蛋白5 (MBD5),MBD6,ALPHA-CRYSTALLIN DOMAIN PROTEIN15.5 (ACD15.5) 和ACD21.4组成的新型蛋白质复合体被确定.
- 这种复合物直接与45S rDNA结合,并调解变异特异的45S rRNA基因表达.
- ACD15.5和ACD21.4对于这种调节至关重要,它们的α-晶体域对复杂相位分离至关重要.
- 效应器MICRORCHIDIA6与复合体相互作用,并被招募到45SrDNA中,以调节基因表达.
结论:
- 一个DNA甲基化读取蛋白质复合体调节了Arabidopsis中变异特异的45SrRNA基因表达.
- 该综合体利用由ACD蛋白调解的相分离来控制基因激活和沉默.
- 这项研究揭示了一种用于控制植物rRNA基因表达的新型表观遗传途径.
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