通过准REX1进行降解,RNF12启动X染色体不活化
Cristina Gontan1, Eskeatnaf Mulugeta Achame, Jeroen Demmers
1Department of Reproduction and Development, Erasmus MC, University Medical Center, Dr Molewaterplein 50, 3015 GE Rotterdam, The Netherlands.
在胎盘哺乳动物中,E3泛基因酶RNF12降解了多能性因子REX1,从而启动了X染色体不活化. 这种RNF12-REX1通路对于雄性和雌性哺乳动物之间的基因剂量补偿至关重要.
科学领域:
- 遗传学 是一个遗传学.
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 发展生物学 发展生物学
背景情况:
- 哺乳动物的性染色体进化需要X链基因剂量补偿.
- 胎盘哺乳动物通过在雌性中随机X染色体不活化来实现这一目标.
- 基因组RNA的上调和扩散引发了表观遗传变化,从而使其失活.
研究的目的:
- 确定RNF12在启动X染色体失活过程中的关键标.
- 阐明REX1多能性因子在这个过程中的作用.
主要方法:
- 在小鼠胚胎干细胞中研究了RNF12-REX1相互作用.
- 使用染色体免疫沉测序 (ChIP-seq) 绘制REX1结合部位的地图.
- 在REX1或RNF12操纵时分析了Xist转录和X染色体失活.
主要成果:
- RNF12针对REX1进行无化和蛋白质体降解.
- Rnf12淘汰细胞表现出高的REX1水平.
- REX1 结合到 Xist 和 Tsix 调节区域,抑制 Xist 转录.
- REX1过度表达阻断了X染色体的不活化;Rex1的哈普隆缺陷导致了异胎性不活化.
结论:
- 由RNF12介导的REX1降解是启动X染色体失活的关键途径.
- RNF12-REX1轴代表了一种剂量依赖的机制,用于启动失活.
- 在胎盘哺乳动物中,Rex1和Xist的共同进化突出了它们在X染色体不活化中的关联作用.
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