神经元分化需要BRAT1复合体来从染色质中去除REST
Sadat Dokaneheifard1, Helena Gomes Dos Santos1, Monica Guiselle Valencia1
1Department of Human Genetics, University of Miami, Miller School of Medicine, Sylvester Comprehensive Cancer Center, Miami, FL 33136.
概括
BRCA1关联ATM激活器1 (BRAT1) 通过与整合器复合体相互作用来激活REST响应基因,对神经元发育至关重要. BRAT1突变破坏了这一过程,导致神经发育缺陷,并将其与神经退行性疾病联系起来.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 抑制元-1沉默转录因子 (REST) 对于成熟的神经元形成至关重要.
- 休息的调节失调有助于神经系统疾病的神经退行.
- 改变神经发生基因REST介导沉默的机制尚不清楚.
研究的目的:
- 研究BRCA1关联ATM激活器1 (BRAT1) 在神经元分化和REST介导的基因沉默中的作用.
- 阐明BRAT1,整合器复合体子单元 (INTS11,INTS9) 和REST之间的相互作用.
- 确定BRAT1突变对神经元基因激活和神经发育的影响.
主要方法:
- 在NT2细胞中减少BRAT1,以观察对神经元分化的影响.
- 同免疫沉和染色体免疫沉试验用于研究蛋白质相互作用和促进体占用.
- 对引起疾病的BRAT1突变的分析.
- 使用野生型和突变型BRAT1.1的小鼠胚胎干细胞进行神经元差异化测试.
主要成果:
- 在神经元分化过程中,需要BRAT1来激活REST响应基因.
- BRAT1与INTS11和INTS9形成了一个三元复合体,以激活神经元基因.
- BRAT1 枯竭导致持续的 REST 结合,破坏神经元分化.
- BRAT1将INTS11招募到基因促进者中;疾病突变损害了BRAT1-INTS11/INTS9的关联.
- 在小鼠ESC中失去Brat1会损害神经元分化,由野生型BRAT1挽救,但不是由突变者.
结论:
- 与INTS11和INTS9相结合的BRAT1在分化过程中在激活关键神经元基因方面发挥着至关重要的作用.
- BRAT1与INTS11/INTS9的相互作用对于正确的神经系统发育至关重要.
- 在BRAT1-Integrator复合体关联中存在的缺陷是相关疾病中观察到的神经发育现象的基础.
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