ゼブラフィッシュの卵細胞における大量アクチンダイナミクス駆動相分離
Shayan Shamipour1, Roland Kardos1, Shi-Lei Xue1
1Institute of Science and Technology Austria, Klosterneuburg, Austria.
Cell
|May 14, 2019
まとめ
斑馬魚の卵細胞の分極化は,新しい細胞サイクル制御されたアクチンポリメリゼーション波に依存しています. この波はオオプラズマを引っ張って 卵黄の粒子を押し出して 動物と植物の軸を確立します
科学分野:
- 発達生物学
- 細胞生物学
- バイオ物理学
背景:
- 卵細胞の分極化は 胚の発達開始に不可欠です
- 卵細胞内の母性決定因子の分離は,胚のパターニングの最初のステップです.
- 以前の理解では 皮質アクチンの再編成がゼブラフィッシュのオプラズマ分離の鍵だったと考えられていた.
研究 の 目的:
- 動物と植物の軸に沿ったオプラズマ分離のメカニズムを調査するゼブラフィッシュの卵細胞.
- アクチンダイナミクスのオプラズマ分離とオオシトの極化における役割を決定する.
主な方法:
- 生物学的な実験と理論的なモデリングを活用した.
- 細胞サイクルに依存するアクチンポリメリゼーション波を調査した.
- オプラズマの引きずりと黄の粒子の押し付けに伴う力を分析した.
主要な成果:
- オオプラズマの分離は 大量アクチンポリメリゼーション波によって引き起こされ,皮質アクチン再編成によって引き起こされない.
- この波は動物から 植物の柱へと移動し オオプラズマを引っ張り 黄の粒子を押し出します
- オオプラズマの引きずりには,大量アクチンネットワークの流れと摩擦力が含まれる.黄色の粒子の押しはアクチン彗星の形成に似ています.
結論:
- 細胞サイクル制御された大量アクチンポリメリゼーション波の新しいメカニズムがオプラズマ分離を制御する.
- このプロセスは,卵細胞の極性および動物-植物軸を確立するために不可欠です.
- この発見は,初期の胚のパターニングにおけるアクチンダイナミクスの役割を再定義します.
関連する概念動画
02:31Phase Transitions
22.8K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
22.8K
01:49Law of Segregation
77.7K
When crossing pea plants, Mendel noticed that one of the parental traits would sometimes disappear in the first generation of offspring, called the F1 generation, and could reappear in the next generation (F2). He concluded that one of the traits must be dominant over the other, thereby causing masking of one trait in the F1 generation. When he crossed the F1 plants, he found that 75% of the offspring in the F2 generation had the dominant phenotype, while 25% had the recessive phenotype.
77.7K
01:16Segregation in Fresh Concrete
569
Segregation in fresh concrete is a phenomenon where the components of the concrete mix separate, leading to uneven distribution and compromised structural integrity. This separation typically occurs when concrete is subjected to excessive horizontal movement within forms, or when it is dropped from considerable heights or forced through narrow, winding paths. As a result, heavier coarse aggregate particles settle at the bottom, while lighter, finer materials such as cement and water rise to the...
569
02:39Phase Transitions: Vaporization and Condensation
20.8K
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
20.8K
01:18Actin Treadmilling
9.6K
Actin filaments undergo polymerization and depolymerization from either end. The polymerization and depolymerization rates depend on the cytosolic concentration of free G-actins. The polymerization rate is generally higher at the plus or barbed end, while the depolymerization rate is higher at the minus or pointed end. At a steady state, critical concentration describes the concentration of free G-actin monomers at which the polymerization rate at the plus end is equal to that of the...
9.6K
01:37Energy to Drive Translocation
2.7K
Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
Generally, polypeptides are unfolded by two distinct...
Generally, polypeptides are unfolded by two distinct...
2.7K