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相关概念视频

Non-Canonical Wnt Signaling Pathways01:41

Non-Canonical Wnt Signaling Pathways

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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...
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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...
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Notch Signaling Pathway03:14

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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...
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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
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The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
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相关实验视频

Updated: Sep 9, 2025

Combining Intravital Fluorescent Microscopy IVFM with Genetic Models to Study Engraftment Dynamics of Hematopoietic Cells to Bone Marrow Niches
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通过调节Wnt/PCP信号,Rbm8a缺乏导致造血缺陷

Agnese Kocere1, Elena Chiavacci2, Charlotte Soneson3

  • 1Department of Pediatrics, Section of Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora, CO, USA; Department of Molecular Life Sciences, University of Zürich, Zürich, Switzerland.

Developmental biology
|September 4, 2025
PubMed
概括
此摘要是机器生成的。

血小板缺失 (TAR) 综合征是由影响mRNA处理的RBM8A突变引起的. 这项研究表明,RBM8A功能受损会破坏Wnt/PCP信号,导致斑马鱼的发育缺陷.

关键词:
发展血液形成形态发生非正规的 Wnt血小板减少斑马鱼

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科学领域:

  • 发育生物学
  • 遗传学
  • 血液学

背景情况:

  • 血小板缺失综合征 (TAR) 是一种罕见的遗传疾病,其特征是血小板数量低和四肢异常.
  • 在RBM8A中发生的突变,是外基结复合物的组成部分,与TAR综合征有关.
  • 由于RBM8A功能障碍导致特定的TAR表型的确切机制尚未完全理解.

研究的目的:

  • 在斑马鱼模型中研究TAR综合征表型的分子机制.
  • 探索非正规Wnt/平面细胞极性 (PCP) 在RBM8A相关发育缺陷中的作用.
  • 确定受减少RBM8A功能影响的关键发育途径.

主要方法:

  • 使用了rbm8a基因中低形态或零突变的斑马鱼模型.
  • 分析的造血细胞群 (cd41阳性血栓细胞).
  • 评估了mRNA完整性和内部保留.
  • 研究了rbm8a与非正规Wnt/PCP通路基因 (wnt5b, wnt11f2, fzd7a, vangl2) 之间的相互作用.
  • 检查了造血和内皮基因的表达 (runx1,gfi1aa).

主要成果:

  • 斑马鱼的rbm8a扰动导致了血栓细胞数量的减少和mRNA与保留的内核的积累.
  • 损坏的rbm8a功能破坏了非正规的Wnt/PCP信号传输,导致融合延伸缺陷.
  • 减少的rbm8a功能与PCP通路基因干扰相互作用,影响侧板半皮体 (LPM) 的发育.
  • 突变者表现出关键的造血/内皮基因,runx1和gfi1aa的表达受损.

结论:

  • 异常的侧板半皮层 (LPM) 模式是rbm8a突变体中减弱的非正规Wnt/PCP信号的关键结果.
  • 在TAR综合征模型中观察到的造血缺陷与破坏的Wnt/PCP信号通路有关.
  • 这项研究提供了mRNA处理缺陷与TAR综合征的特定发育异常之间的机制联系.