MeCP2 功能障碍阻止了正确的 BMP 信号传递和神经前体扩张在大脑有机体中
Hyowon Hong1, Sae-Bom Yoon1, Jung Eun Park1
1Therapeutics & Biotechnology Division, Korea Research Institute of Chemical Technology, 141 Gajeong-ro, Yuseong-gu, Daejeon, Republic of Korea.
Annals of clinical and translational neurology
|June 11, 2023
概括
在雷特综合征 (RTT) 模型中,MeCP2中的突变破坏了早期的大脑发育. 在RTT有机体中调节BMP通路可以挽救神经母细胞扩张和分化,提供新的治疗点.
科学领域:
- 神经科学是一个神经科学.
- 发展生物学 发展生物学
- 遗传学 遗传学 是一个
背景情况:
- 雷特综合征 (RTT) 是一种神经发育障碍,由甲基-CpG结合蛋白2 (MeCP2) 基因的零星突变引起.
- 现有的RTT大脑器官模型主要关注晚期表型,忽视早期神经祖先缺陷.
研究的目的:
- 在一个新的RTT大脑器官模型中研究神经前细胞的早期发育缺陷.
- 在早期皮层发育期间识别受MeCP2功能障碍影响的分子通路.
主要方法:
- 使用CRISPR/Cas9工程MeCP2-截断诱导多能干细胞 (iPSCs) 建立了雷特综合征大脑器官模型.
- 利用免疫光成像来评估神经原生细胞 (NPC) 池的发展和命运规范.
- 进行了总RNA测序,以分析RTT有机体中改变的信号通路.
主要成果:
- MeCP2功能障碍损害了神经形形成和减少了谷氨酸性神经发生,导致星球细胞的过度生产.
- 转录组分析显示,骨形态遗传蛋白 (BMP) 信号通路的调节失调,pSMAD1/5和BMP目标基因增加.
- 抑制BMP途径部分挽救了NPC细胞周期进展,VGLUT1表达,并抑制了天体细胞成熟.
结论:
- 通过调节BMP通路,MeCP2在早期大脑发育期间对神经前代细胞扩张至关重要.
- 鉴定到的BMP通路调节失调及其对神经生成和神经生成的影响,为RTT病原体提供了洞察力.
- 在早期发育阶段准BMP通路可能为雷特综合征提供治疗潜力.
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