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Updated: May 12, 2026
04:27
Live-cell Imaging of Sensory Organ Precursor Cells in Intact Drosophila Pupae
Published on: May 27, 2011
まとめ
Notch遺伝子の変異により,ハエの胚細胞は皮膚ではなく神経細胞になる. ノッチ遺伝子の機能は自律的であり,つまり細胞内で局所的に作用し,発達中の細胞運命を制御する.
科学分野:
- 発達生物学 発達生物学とは
- 遺伝学 遺伝学とは
- 神経科学は神経科学である.
背景:
- Notch遺伝子は,胚の発達中の細胞運命を決定する上で重要な役割を果たします.
- ドロソフィラ胚のノッチ・ロカスにおける突然変異は,表皮の前駆体を神経芽細胞に変容させる.
- Notch遺伝子の機能の正確な細胞要件を理解することは,発達経路の解読に不可欠です.
研究 の 目的:
- ドロソフィラのニューロゲネシスにおける野生型のノッチ遺伝子機能の細胞的要件を調査する.
- 下皮細胞の分化におけるノッチの自律的または非自律的な役割を決定する.
- ニューロゲネシス中のNotchタンパク質の局所的機能を解明する.
主な方法:
- ドロソフィラ胚の遺伝子モザイクを使用して,ノッチ遺伝子の機能を分析しました.
- モザイク胚内の下皮細胞遺伝子型を区別するために皮質マーカーを使用した.
- 細胞の運命決定を評価するために,野生型のクローンと突然変異のクローンの分布を調べました.
主要な成果:
- ニューロゲン領域内のゲノタイプ的にノッチ細胞は,下皮に微分化できませんでした.
- モザイクの境界線は,ノッチ陽性下皮が神経縮に隣接するノッチ陽性下皮と,自律的なノッチ機能を明らかにした.
- コントロールと比較すると,野生型の下皮細胞島はノッチモザイクの皮質を区別できませんでした.
結論:
- ノッチ遺伝子の機能は下皮細胞で自律的に機能し,局所的に作用して細胞運命を調節する.
- Notchタンパク質は,表皮の発達に不可欠であり,ニューロゲン領域のニューラル運命を防止します.
- これらの発見は,ドロソフィラのニューロゲネシス中に細胞のアイデンティティを維持する上でノッチ信号の重要性を強調しています.
関連する概念動画
01:51Determination
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...
03:14Notch Signaling Pathway
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 until 1985...
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 until 1985...
02:33Hedgehog Signaling Pathway
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...
01:41Non-Canonical Wnt Signaling Pathways
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...
03:14Notch Signaling Pathway
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 until 1985...
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 until 1985...
01:12Role Of Notch Signalling In Intestinal Stem Cell Renewal
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...