関連する実験動画
Updated: Aug 6, 2026

08:39
Ex vivo Culturing of Whole, Developing Drosophila Brains
Published on: July 27, 2012
12.6K
発達的に調節された亜核ゲノム再編成は,ドロソフィラにおける神経原始体の能力を制限する
Minoree Kohwi1, Joshua R Lupton, Sen-Lin Lai
1Institute of Neuroscience, Institute of Molecular Biology, Howard Hughes Medical Institute, University of Oregon, Eugene, OR 97403, USA.
Cell
|January 22, 2013
まとめ
幹細胞は,時間の経過とともに初期の細胞タイプを作成する能力を失います. ドロソフィラでは,うっすら背の高い遺伝子があります.
科学分野:
- 発達生物学 発達生物学とは
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
背景:
- 幹細胞と祖先細胞は,連続して異なる細胞タイプを生成します.
- 祖先は,未知のメカニズムを通じて,時間の経過とともに早期の運命を指定する能力を失います.
- ドロソフィラでは,ハンチバック (Hb) 転写因子は,神経原生 (ニューロブラスト) の初期のニューロンを指定します.
研究 の 目的:
- ドロソフィラの祖先能力の喪失の背後にあるメカニズムを調査する.
- ニューロブラストの運命の仕様におけるハンチバックの遺伝子調節の役割を理解する.
主な方法:
- In vivo 免疫DNA FISH で,遺伝子の位置を追跡する.
- 核内のハンチバック遺伝子の位置変更の分析.
- 遺伝子再定位とタンパク質発現 (ディスタルアンテナ - Dan) と祖先能力の相関.
主要な成果:
- ハンチバック遺伝子は,ニューロブラストの能力が失われると,抑圧的なコンパートメントである核周辺に移動します.
- この位置変更は,転写終了の数時間後に発生し,遠端アンテナ (Dan) のダウンレギュレーションと相関しています.
- ダン発現を延長したり,ラミナを乱したりすると,ハンクバックの位置転換が妨げられ,神経芽細胞の能力が拡張される.
結論:
- 神経芽細胞は,発達的に調節された亜核ゲノム再編成を経験する.
- この再編成は,ハンクバックの標的遺伝子を永久に沈黙させ,祖先の能力の喪失につながります.
- 亜核遺伝子の位置づけは,発達のタイミングと細胞の運命決定を調節する重要なメカニズムです.
関連する概念動画
Exon Recombination
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Introduction to Nuclear Reprogramming
Nuclear reprogramming is the process of switching gene expression of one cell type to that of another cell type, usually from a differentiated cell state to an undifferentiated cell state. Differentiation occurs during processes such as development and morphogenesis, tissue regeneration, and malignancy. Cells can also be artificially induced to reprogram their gene expression by techniques such as nuclear transfer, induced pluripotency, and cell fusion. Such techniques have many applications in...
Methods of Nuclear Reprogramming
Nuclear reprogramming is a process of transforming one cell type into an unrelated cell type by epigenetic changes that alter the cell’s original gene expression pattern. Such epigenetic changes force cells to express a different set of genes, which play a significant role in inducing transformation into other cell types. Nuclear reprogramming offers applications in reproductive cloning for livestock propagation and regenerative medicine — developing patient-specific cells for injury repair.
Neurogenesis and Regeneration of Nervous Tissue
In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
Neuroplasticity
Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.

