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相关概念视频

Cell Polarization by Rho Proteins01:21

Cell Polarization by Rho Proteins

Cell polarity is the asymmetric distribution of cellular and membrane components, making one side of the cell different from the other. This polarity is essential to many processes such as embryogenesis, axon migration, glucose transport across epithelial cells, and directional cell migration. A migrating cell responds to intracellular or extracellular signals via molecular cascades that reorganize the actin cytoskeleton to establish this polarity. In these cells, the Rho family proteins Cdc42,...
Chemotaxis and Direction of Cell Migration01:21

Chemotaxis and Direction of Cell Migration

Cells can detect chemical cues in their environment and reorganize the cytoskeleton to migrate toward them or away from them. This directional migration, called chemotaxis, is essential during embryogenesis and development, immune response, tissue repair and regeneration, and reproduction. These chemical cues can either attract or repel the cell's movement. For example, axon development is determined by a combination of chemoattractants and chemorepellents that direct the growing axon towards...
Cis-regulatory Sequences02:02

Cis-regulatory Sequences

Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
Pedigree Analysis01:35

Pedigree Analysis

Overview
Position-effect Variegation02:32

Position-effect Variegation

In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
Determination01:51

Determination

During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In contrast, determination...

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Optimized Analysis of Proteins from Xenopus Oocytes and Embryos by Immunoblotting
09:32

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Published on: September 19, 2025

双形梯度是否重要?

Siegfried Roth1, Jeremy Lynch

  • 1Institut of Developmental Biology, Biocenter, University of Cologne, Zülpicher Straße 47b, 50674 Köln, Germany. siegfried.roth@uni-koeln.de

Cell
|May 1, 2012
PubMed
概括
此摘要是机器生成的。

研究人员发现了模式梯度如何在Drosophila胚胎中产生位置信息. 这些发现为胚胎发生过程中的发育系统和细胞通信提供了新的见解.

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Analysis of Trunk Neural Crest Cell Migration using a Modified Zigmond Chamber Assay
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Last Updated: May 22, 2026

Optimized Analysis of Proteins from Xenopus Oocytes and Embryos by Immunoblotting
09:32

Optimized Analysis of Proteins from Xenopus Oocytes and Embryos by Immunoblotting

Published on: September 19, 2025

Analysis of Trunk Neural Crest Cell Migration using a Modified Zigmond Chamber Assay
12:17

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Published on: January 19, 2012

In Vivo Modeling of the Morbid Human Genome using Danio rerio
12:31

In Vivo Modeling of the Morbid Human Genome using Danio rerio

Published on: August 24, 2013

科学领域:

  • 发展生物学 发展生物学
  • 细胞信号传输 细胞信号传输
  • 遗传学 是一个遗传学.

背景情况:

  • 位置信息对于胚胎发育至关重要,指导细胞分化和组织形成.
  • 众所周知,模式梯度在发展中生物体内建立细胞身份方面发挥着作用.

研究的目的:

  • 研究模式梯度产生位置信息的机制.
  • 为了获得对Drosophila胚胎早期发育过程的新见解.

主要方法:

  • 在Drosophila melanogaster胚胎中利用遗传分析.
  • 观察并分析了特定基因突变对梯度形成和解释的影响.

主要成果:

  • 确定了参与生成和解释位置线索的新组件和相互作用.
  • 证明了特定的模式梯度和由此产生的位置信息之间存在直接联系.

结论:

  • 这项研究更深入地了解了开发过程中空间信息是如何被编码的.
  • 这些发现有助于更广泛地了解发育系统和细胞通信通路.