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Cleavage and Blastulation01:33

Cleavage and Blastulation

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After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage is a mitotic cell division that does not result in growth. With each round of successive cell division, daughter cells get increasingly smaller.
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Cell Migration01:09

Cell Migration

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Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms throughout their life. When cells are not able to migrate properly to their ordained locations, various disorders may occur. For example, disruption in cell migration causes chronic inflammatory diseases such as arthritis.
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Hedgehog Signaling Pathway02:33

Hedgehog Signaling Pathway

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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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Mechanism of Filopodia Formation01:39

Mechanism of Filopodia Formation

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Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
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Mechanism of Lamellipodia Formation01:31

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Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
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TGF - β Signaling Pathway01:16

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The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors...
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Using Confocal Analysis of Xenopus laevis to Investigate Modulators of Wnt and Shh Morphogen Gradients
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Fgf8形質のグラデントは,自由に拡散する分子を持つソースシンクメカニズムによって形成されます.

Shuizi Rachel Yu1, Markus Burkhardt, Matthias Nowak

  • 1Developmental Genetics, Biotechnology Center, TUD, Tatzberg 47-49, 01307 Dresden, Germany.

Nature
|September 11, 2009
PubMed
まとめ
この要約は機械生成です。

フィブロブラスト成長因子8 (Fgf8) モルフォゲングラデントは,ゼブラ魚の胚で分子拡散と細胞吸収によって形成されます. このソースシンクメカニズムは,モルフォゲン・グラデーションが組織発達を確立する方法を説明します.

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Grafting of Beads into Developing Chicken Embryo Limbs to Identify Signal Transduction Pathways Affecting Gene Expression
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科学分野:

  • 発達生物学 発達生物学とは
  • 分子生物学は分子生物学である.
  • 遺伝学 遺伝学とは

背景:

  • モルフォゲン・グラデーションは,多細胞生物の組織分化と形態変異に不可欠である.
  • モルフォゲン・グラデント形成の背後にある正確なメカニズムは,まだ完全に理解されていません.

研究 の 目的:

  • 生きた斑馬魚の胚におけるフィブロブラスト成長因子8 (Fgf8) 形態原グラデントの形成と維持に起因するメカニズムを解明する.
  • モルフォゲン・グラデーションの形成における分子拡散と細胞吸収の役割を調査する.

主な方法:

  • 光相関スペクトロスコーピーを用いた生きたゼブラフィッシュ胚におけるFgf8の単分子直接観察.
  • 高い精度でFgf8の局所的移動性と濃度の定量化.
  • 標的細胞によるFgf8吸収の実験操作で,そのグラデント形成への影響を評価する.

主要な成果:

  • Fgf8モルフォゲン・グラデーションは,単一分子の素早く自由な拡散によって細胞外空間を通じて確立され,維持されます.
  • 受容細胞によって提供される重要なシンク機能は,受容体媒介性内分細胞症によって調節され,グラデーション維持に不可欠です.
  • Fgf8の吸収を調節すると,形質原 gradientの形状と特徴が直接変化する.

結論:

  • 自由な拡散と調節された細胞吸収を含む単純なソースシンクメカニズムは,複雑な組織における形態原グラデントの形成を効果的に説明します.
  • この研究は,モルフォゲン・グラデント形成を制御するダイナミックなプロセスの直接的な証拠を in vivo で提供しています.
  • 発見は,発達パターンと組織組織の基本的な原理の洞察を提供します.