甲基-CpG结合域作为蛋白质相互作用伙伴,通过进化扩展纠来促进调节和神经发育
Stephanie M Bilinovich1,2,3, Surya B Chhetri4,5,6, Jackson T Mitchell1
1Department of Pediatrics, College of Human Medicine, Michigan State University, Grand Rapids, Michigan, United States.
American journal of physiology. Cell physiology
|July 25, 2025
概括
甲基结合域 (MBD) 对于蛋白质相互作用至关重要,调节物种间的基因表达. 它的非DNA结合功能对于神经发育至关重要,并从植物到人类保存.
科学领域:
- 表观遗传学和基因调控
- 进化生物学 进化生物学
- 分子细胞生物学 分子细胞生物学
背景情况:
- 甲基结合域 (MBD) 是一种蛋白质基因,越来越多的证据表明蛋白质与蛋白质相互作用功能独立于DNA结合.
- 脊椎动物进化过程中,MBD蛋白在物种之间多样化,DNA结合能力在脊椎动物进化过程中多次丧失,但蛋白质相互作用能力保留.
- 核细胞重塑和脱乙酶 (NuRD) 复合体与MBD蛋白相互作用,即使MBD丧失了DNA结合能力,它也会保持.
研究的目的:
- 调查甲基结合域 (MBD) 作为蛋白质-蛋白质相互作用动机的进化保护和功能意义.
- 探索MBD蛋白和NuRD复合体在基因调节中的作用,特别是在神经发育中.
- 突出非DNA结合的MBD功能在保存的生物过程中的重要性.
主要方法:
- 分析跨物种的MBD蛋白质演变和相互作用残留物的保存.
- 在各种人体细胞类型 (HepG2,iPSC,iPSC衍生的肝细胞) 中对NuRD复合物的ChIP测序 (ChIP-seq).
- 整合单细胞RNA测序 (scRNA-seq) 和批量组织表达数据以分析MBD相互作用蛋白和NuRD组件.
主要成果:
- NuRD复合物局部化到非甲基化CpG丰富的促进家政基因的促进者,对器官生成至关重要,并且保持在非DNA结合的MBD系统中,如在Drosophila melanogaster中.
- 表达式分析揭示了MBD3,MECP2和GATAD2B在大脑发育和智力障碍综合征中的关键作用.
- 这些作用在整个无脊椎动物神经发育过程中都被保留,这表明进化扩张和与脊椎动物MBD蛋白质多样化纠.
结论:
- 甲基结合域 (MBD) 作为一个关键的,进化保存的蛋白相互作用动机,调节增强剂和促进剂,在DNA结合之外发挥着重要作用.
- 由MBD调节的NuRD复合物的局部化到低甲基化CpG岛屿突出了其在维持基本基因表达的重要性.
- NuRD的MBD3-GATAD2B亚复合物需要进一步研究其在神经发育中的非DNA结合作用,在物种之间保持.
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