在过度表达系统中,ADNP表现出甲基转移酶活性,并调节DNA和海斯甲基化
Claudio Peter D'Incal1, Kirsten Esther Van Rossem1, Elisa Cappuyns1
1Department of Biomedical Sciences, Cognitive Genetics (COGNET), Center of Medical Genetics, University of Antwerp, Antwerp, Belgium.
概括
活动依赖神经保护蛋白 (ADNP) 作为甲基转移酶,调节诸如DNA甲基化和基因组标记之类的表观遗传修饰. ADNP的变异与神经发育障碍有关,影响染色质结构和功能.
科学领域:
- 神经科学是一个神经科学.
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 分子生物学分子生物学
背景情况:
- 活动依赖神经保护蛋白 (ADNP) 参与神经元分化和染色质重塑.
- 新的ADNP变种导致赫尔斯穆尔特尔-范德阿综合征,其特征是自闭症和智力障碍.
- 以前的研究表明ADNP在染色体重塑中的作用,但缺乏其表观遗传功能的直接证据.
研究的目的:
- 研究ADNP的表观遗传调节作用.
- 确定ADNP参与表观遗传调节的相互作用伙伴.
- 描述ADNP变异对表观遗传修饰的功能影响.
主要方法:
- 使用HEK293T细胞和小鼠胚胎干细胞进行蛋白与蛋白相互作用研究.
- 结构建模用于预测ADNP的催化域.
- 在体外甲基转移酶试验中使用免疫降落ADNP.
- 在小鼠大脑和尸检样本中分析基因组修饰 (H3K79me1) 和DNA甲基化 (CpG位).
- 评估ADNP变异对表观遗传修饰的影响.
主要成果:
- ADNP与WDR5和HDAC2相互作用,形成一个参与表观遗传调节的蛋白质复合体.
- 结构建模表明ADNP中的甲基转移酶域,通过体外活性试验证实.
- 野生类型的ADNP诱导了CpG高甲基化,而大多数变体导致了低甲基化,表明功能丧失.
- 在ADNP表达组织中观察到H3K79me1的男性特异性减少.
- 核定位信号 (NLS) 变体表现出功能增益效应,包括高甲基化,亡和微管运输中断.
结论:
- ADNP作为甲基转移酶起作用,直接调节表观遗传修饰.
- 鉴定到的ADNP-WDR5-HDAC2复合体在表观遗传调节中起着至关重要的作用.
- 通过改变表观遗传机制,ADNP变异导致神经发育障碍,根据变异类型产生不同的影响.
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