神经元的受限N-糖体在分化过程中被编程
Katherine Kiwimagi1, Maxence Noel2, Murat Cetinbas3
1Synthetic Biology Center, Department of Biomedical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
bioRxiv : the preprint server for biology
|October 28, 2024
概括
大脑是大脑的大脑.
科学领域:
- 神经科学是一个神经科学.
- 葡萄糖生物学 葡萄糖生物学
- 细胞生物学 细胞生物学
背景情况:
- 大脑的蛋白质糖体,特别是N链糖体,在细胞特异水平上基本未被探索.
- 高曼诺斯结构,如Man5GlcNAc2 (Man-5),在成年大脑中大量存在,但在其他地方并不常见.
- 了解细胞特异性糖体对于发育和疾病研究至关重要.
研究的目的:
- 调查细胞对独特的大脑N-glycome.com的特异性贡献.
- 在关键脑细胞类型的分化过程中分析Man-5和相关结构的丰富性.
- 探索神经元分化中的转录学和糖学之间的关系.
主要方法:
- 从人类可诱导多能干细胞 (hiPSCs) 产生了质神经元,GABAergic神经元和脑特异性内皮细胞的同质培养.
- 利用RNA测序 (RNAseq) 和MALDI-MS TOF蛋白N-糖因子,分析在不同分化时间点上的甘氨酸样本.
- 采用合成转录单元的小分子诱导来驱动分化.
主要成果:
- 差异化神经元 (Glutamatergic和GABAergic) 显示Man-5和Man-6是最丰富的N-glycans,尽管有转录用于进一步处理.
- 特定于大脑的内皮细胞表现出复杂的N-甘氨酸和晚期分泌通路修饰.
- 不差异化的hiPSCs具有类似的转录组和糖组特征,Man-5水平较低.
结论:
- 大脑的受限制的N-葡萄糖特征是在神经元分化过程中被编程的.
- 神经元中的甘氨酸调节似乎独立于转录组.
- 观察到的糖体模式在显著的进化约束下.
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