翼のないモルフォゲン・グラデントの直接的,長距離的作用.
Cell
|November 29, 1996
まとめ
Wingless (Wg) は,濃度と距離に基づいて遺伝子転写を直接調節することによって,ドロソフィラの発達における長距離形態原体として作用します. これは,制限された効果または自律的な効果を持つ縛られたWgまたはArmadillo (Arm) と対照的です.
科学分野:
- 発達生物学 発達生物学について
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- Wingless (Wg) は,ドロソフィラの発育に不可欠な分泌タンパク質である.
- Wgシグナル伝達には,Armadillo (Arm) という細胞性タンパク質が関与しています.
- Wgの正確な作用機構,特にその範囲は調査中です.
研究 の 目的:
- 野生型Wg,膜結合型Wg,構成的に活性なArmadillo (Arm) が遺伝子転写に及ぼす影響を調査する.
- これらの効果を,内生的なWgまたはArm活動の除去と比較するために.
- 長期的な形態原体としてのWgの役割を明らかにする.
主な方法:
- 野生型Wg,膜結合型Wg,および構成的に活性なArm.の胎外表現.
- 内生的なWgまたはArm活動を除去する効果と比較.
- Wgシグナル伝達に反応する標的遺伝子転写の分析.
主要な成果:
- 野生型のWgは,標的遺伝子転写を濃度および距離に依存した方法で上位に調節し,長距離の作用を示します.
- 膜に結合したWgは,遺伝子転写に短期的な影響を及ぼします.
- 構成的に活性なArmは,遺伝子転写に自律的な効果を示しています.
結論:
- Wgは,ドロソフィラの発達の過程で,直接的,長距離のグラデーション形態原体として機能する.
- Wg信号の範囲は,その分泌される性質に依存しています.
- Wg伝導におけるアーマディロの役割は不可欠ですが,Wgの長距離形態遺伝的活動とは異なります.
さらに関連する動画
11:48Grafting of Beads into Developing Chicken Embryo Limbs to Identify Signal Transduction Pathways Affecting Gene Expression
Published on: January 17, 2016
8.3K
08:25Imaging and Analysis of Tissue Orientation and Growth Dynamics in the Developing Drosophila Epithelia During Pupal Stages
Published on: June 2, 2020
8.6K
関連する概念動画
Cell Migration
16.6K
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.
16.6K
Determination
16.3K
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...
16.3K
Canonical Wnt Signaling Pathway
8.6K
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...
8.6K
Non-Canonical Wnt Signaling Pathways
6.4K
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...
6.4K
Cell Migration
6.1K
Cell migration is a process by which the cells move from one location to another, playing an essential role in embryological development, repair and regeneration, immune response, and metastasis. Cells migrate in response to chemical or mechanical signals generated by specific organs or tissues. The overall mechanism includes three steps - polarization, protrusion, and release. Polarization involves the formation of a distinct cell front and rear, which determines the direction of movement.
6.1K
Mechanism of Lamellipodia Formation
3.1K
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...
3.1K
