相关实验视频
Updated: Jun 28, 2025

09:41
Reconstitution Of β-catenin Degradation In Xenopus Egg Extract
Published on: June 17, 2014
12.1K
Nkd1在Axin2的下游发挥作用,减弱Wnt信号传输
Ian Bell1, Haider Khan1, Nathan Stutt2
1Department of Molecular and Cellular Biology, University of Guelph, Guelph, N1G 2W1 Ontario, Canada.
Molecular biology of the cell
|April 24, 2024
概括
这项研究揭示了Axin2和Nkd1是如何调节Wnt信号的. 斑马鱼突变体显示Nkd1在Axin2的下游活动,Axin2单独影响Wnt活动,双重突变体拯救了一个没有眼睛的表型.
科学领域:
- 发展生物学 发展生物学
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- 对于发育和成年干细胞的维护,Wnt信号是至关重要的.
- 错误的Wnt信号调节有助于各种疾病.
- Axin2和Nkd1是Wnt信号传输的关键负反调节器.
研究的目的:
- 阐明Axin2和Nkd1在Wnt信号传递中的调节作用.
- 为了研究Axin2和Nkd1.1.之间的功能关系.
- 为了描述斑马鱼突变体中的Wnt信号动态.
主要方法:
- 使用sgRNA/Cas9.9生成单个和双个突变斑马鱼的axin2和nkd1.
- 现型分析包括心脏循环,神经杆迁移和行为.
- 通过qRT-PCR,RNA-seq和质谱分析基因和蛋白质表达.
主要成果:
- 所有突变者都表现出共同的缺陷 (心脏循环,神经杆迁移,行为),而双重突变者没有协同作用.
- 亚克辛2双突变体对nkd1突变体进行了拷贝,这表明nkd1在亚克辛2.2的下游作用.
- Axin2独特调节的Wnt目标基因转录,不同于nkd1或双突变.
- 单个突变体表现出高Wnt敏感性 (无眼的表型),令人惊的是,在双重突变体中得到拯救.
结论:
- 在Wnt信号调节中,Nkd1在Axin2的下游发挥作用.
- 亚辛2对Wnt/β-catenin活性具有独特的调节功能.
- Wnt/β-catenin和Wnt/平面细胞极性通路之间的潜在交叉对话会影响Wnt信号的结果.
- Wnt信号的反调节是复杂的,涉及复杂的相互作用.
相关概念视频
Canonical Wnt Signaling Pathway
8.7K
The gene encoding the main signaling molecules of the Wnt signaling pathways (the Wnt proteins) was discovered almost four decades ago by Nüsslein-Volhard and Wieschaus. They identified and originally named the gene "wingless" (wg) after a phenotype discovered during their landmark genetic screen in Drosophila for body pattern defects. At around the same time, another researcher named Harold Varmus found that a murine tumor virus activates the mammalian wg homolog, Int-1, which...
8.7K
Non-Canonical Wnt Signaling Pathways
7.3K
Wnt is a zygotic effect gene that is expressed during very early embryonic development. It regulates various processes in animals starting from early development through the adult stage, such as organogenesis in the embryo and maintenance of neuronal and blood stem cells. Wnt proteins can induce a wide variety of intracellular pathways depending upon the specific abilities of different Wnt ligands to form a complex with shared and cognate receptors in the presence of different co-receptors. The...
7.3K
Role Of Notch Signalling In Intestinal Stem Cell Renewal
2.1K
Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
2.1K
Role of Ephrin-Eph Signalling in Intestinal Stem Cell Renewal
2.2K
Erythropoietin-producing hepatocellular carcinoma receptor (Eph) and its ligand, Eph receptor-interacting protein (Ephrin) were first discovered in the human carcinoma cell line, hence the name. Ephrin-Eph interaction guides cells to reach their appropriate location in adult tissues. They also play an essential role in the immune system by helping in immune cell migration, adhesion, and activation. Based on their structure and function, Eph is divided into two classes — EphA and EphB.
2.2K
Notch Signaling Pathway
4.3K
The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not...
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not...
4.3K
Catenins
2.3K
Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the...
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the...
2.3K

