通过调节 WDR5 稳定性,E3 泛素酶 RNF220 维持后脑Hox 表达模式
Huishan Wang1, Xingyan Liu2,3, Yamin Liu1,4
1Key Laboratory of Genetic Evolution and Animal Models, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China.
eLife
|November 11, 2024
概括
RNF220 E3 泛素酶调节霍克斯基因表达和后脑发育. 丢失RNF220导致去抑制的Hox基因,影响pontein核和神经回路,由WDR5.5介导.
科学领域:
- 发展生物学 发展生物学
- 神经科学是一个神经科学.
- 遗传学 遗传学 是一个
背景情况:
- 霍克斯基因在后脑中建立前后 (A-P) 轴模式和神经元发育.
- RNF220,一种E3泛基因酶,通过向各种基质,在神经发育中发挥作用.
- 霍克斯基因表达的失调与发育异常有关.
研究的目的:
- 研究RNF220在后脑发育过程中调节Hox基因表达中的作用.
- 阐明RNF220影响Hox基因模式和神经电路形成的分子机制.
- 为了确定后脑发育障碍的潜在治疗点.
主要方法:
- 使用单核RNA测序 (RNA-seq) 对野生类型和Rnf220突变小鼠胚胎的Hox基因表达的比较分析.
- 研究RNF220和WDR5之间的相互作用,这是TrxG复合物的组成部分.
- 在Rnf220突变小鼠中,药理上抑制WDR5和遗传废除Wdr5.
- 使用P19胚胎癌细胞进行体外研究,以评估霍克斯基因调节.
主要成果:
- 缺少RNF220导致Hox基因在E15.5.5.的小马中显著上调.
- 单核RNA-seq在Rnf220突变小鼠的庞丁核 (PN) 神经元中揭示了明显的霍克斯去压缩特征.
- RNF220针对WDR5进行多比基因化和降解,影响Hox基因表达.
- 在Rnf220突变后脑中,抑制或消去WDR5在很大程度上恢复了正常的Hox表达模式.
- 敲除RNF220增强了P19细胞中的视网膜酸诱导的Hox表达,该表达被WDR5敲除所挽救.
结论:
- RNF220在维持Hox基因表达模式方面发挥着至关重要的作用,这对于正常的后脑和后脑发育至关重要.
- RNF220-WDR5轴是霍克斯基因去抑制和随后对神经电路发育的影响的关键调节者.
- 这些发现确定了一种涉及RNF220和WDR5在发展过程中精确控制Hox基因表达的新机制.
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