缺乏KMT2D会导致细胞发育障碍和神经含有神经的脑器官中增强器失调
Ziyun Shan1, Yingying Zhao2, Xiuyu Chen1
1Center for Cell Lineage and Development, Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, Guangdong-Hong Kong Joint Laboratory for Stem Cell and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou 510530, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Science bulletin
|September 26, 2024
概括
卡布基综合征是由KMT2D突变引起的,涉及神经缺陷. 这项研究确定了KMT2D.
科学领域:
- 发展生物学 发展生物学
- 遗传学 是一个遗传学.
- 神经科学是一个神经科学.
背景情况:
- 卡布基综合征是一种遗传性疾病,其特征是面和认知异常,主要与KMT2D,H3K4me1甲基转移酶的突变有关.
- 在卡布基综合征的发展中KMT2D的作用背后的确切的细胞起源和分子机制,特别是关于神经和神经元谱系,仍然不清楚.
研究的目的:
- 通过优化大脑器官模型,研究卡布基综合征中KMT2D功能障碍的细胞和分子机制.
- 确定KMT2D的特定增强剂目标及其在神经发育和疾病发病过程中的作用.
主要方法:
- 开发一种大脑器官模型,用于研究神经和神经元分化.
- 基于单细胞多原子集成的新型全基因组环调节元素探测器 (GREE) 工具的应用.
- 分析KMT2D淘汰和患者衍生器官,以及KMT2D突变的小鼠模型.
主要成果:
- 缺乏KMT2D的有机体表现出神经异常和过度的GABAergic神经元产生.
- GREE确定了KMT2D在激活WNT3A增强器的关键作用,该增强器在类似屋顶板的利基细胞中,这对神经发育至关重要.
- 有KMT2D突变的小鼠表现出减少WNT3A表达,并且在有机体中WNT3A增强剂的删除模仿了KMT2D枯竭表型;WNT通路的重新激活挽救了缺陷.
结论:
- KMT2D主要针对利基细胞中的WNT3A增强剂,调节神经和卡布基综合征神经元发育至关重要的微环境.
- 这一发现提供了KMT2D突变和卡布基综合征表型之间的机制联系,通过准WNT信号提供了潜在的治疗途径.
- 使用先进的有机体和多原子方法建立了一个新的框架,以了解遗传疾病中的基因型-表型关系.
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