FMRP调节的aggrecanmRNA翻译控制周神经元净发育
Heleen M Van't Spijker1, Joel D Richter1
1Program in Molecular Medicine, University of Massachusetts Chan Medical School, Worcester, Massachusetts, USA.
Journal of neurochemistry
|January 15, 2024
概括
脆弱X综合征通过影响周神经网络 (PNN) 破坏大脑发育. 失去FMRP蛋白质会损害aggrecan mRNA的翻译,影响PNN的形成和神经元激发/抑制平衡.
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:
- 周神经网络 (PNNs) 对于大脑的E/I平衡和可塑性至关重要.
- 在与Fmr1基因沉默相关的脆弱X综合征 (FXS) 中,PNN形成受到干扰.
- FXS涉及到突触可塑性受损,神经元过度兴奋,以及E/I不平衡.
研究的目的:
- 调查脆弱X综合征中的PNN变化.
- 阐明FMRP在PNN开发和监管中的作用.
- 确定将FMRP与PNN形成联系起来的分子机制.
主要方法:
- 在不同发育阶段的Fmr1KO小鼠中进行PNN成分 (WFA,aggrecan) 的免疫组织化学染色.
- 亚格格兰的mRNA和蛋白质水平的分析.
- 核糖体造型和多尾长度测试,以评估转化控制.
主要成果:
- 在Fmr1 KO小鼠中观察到减少PNN,特别是在早期发育阶段 (P14).
- 阿格格兰mRNA水平没有变化,但Fmr1KO小鼠的翻译减少.
- FMRP 结合了 aggrecan mRNA,其缺失导致翻译效率降低和较短的多元A尾.
结论:
- 在发育过程中,FMRP对于正常PNN形成至关重要.
- FMRP充当了亚格雷干mRNA的翻译激活剂.
- FMRP通过翻译上调调节亚格雷根mRNA多基和翻译来调节PNN形成,影响FXS中的大脑E/I平衡.
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