SogによるDpp信号伝導の局所的抑制と長距離増強
1Department of Molecular and Cellular Biology, University of California, Berkeley 94720, USA.
Nature
|April 14, 1999
まとめ
ショート・ガストルーレーション (Sog) タンパク質とそのプロテアゼトロイド (Tld) は,ドロソフィラの発達におけるデカペンタプレジック (Dpp) シグナル伝達グラデーションに不可欠である. ソグソグソグ ソグソグソグ
科学分野:
- 発達生物学 発達生物学とは
- 分子シグナル伝達です.
- 遺伝学 遺伝学とは
背景:
- 細胞外シグナリング・グラディエントは,発達中の遺伝子活動値を確立する.
- デカペンタプレジック (Dpp) アクティビティ・グラディエントは,ドロソフィラの背中のエクトダーマをパターン化します.
- ショートガストルレーション (Sog) とトロイド (Tld) タンパク質は,DPPグラデント形成に不可欠です.
研究 の 目的:
- ピークDppシグナル伝達によって指定された,アンニオセロサ形成におけるSogのパラドックスな役割を調査する.
- Sog と Tld が Dpp 信号グラデーションを形作るメカニズムを解明する.
- Sogがさまざまな場所でDPPの活動にどのように影響するかを理解する.
主な方法:
- dppを表現する変異体の背景で,均等にスキップされたストライプ-2増強剤を使用したSogの誤った表現.
- 局所的なSog. Sog. に反応するDpp信号分布の分析.
- 拡散要件を評価するために,SOGの結合された形式を使用します.
- Sogの効果と異質なDpp阻害剤Nogginを比較する.
主要な成果:
- 誤って表現されたSogは,Dpp信号を再分配し,Sog源の近くでそれを減らし,ディスタルでピークに達しました.
- Tethered Sogは局所的なDpp活動を抑制したが,遠隔でそれを強化することはなかったので,拡散が重要なことを示唆している.
- Sogによる長距離Dpp刺激にはTldが必要だが,Sogによる抑制にはTldは必要ない.
- ノーギンはDPP信号伝達を阻害したが,Sog.と異なり,Dpp信号伝達を増強することはなかった.
結論:
- Sogの拡散は,DPPの活性とアミノセロサの形成を高めるために必要である.
- Sog と Tld は,Sog 源から遠く離れたピークアクティビティを指定する,Dpp シグナルグラデーションを生成する珍しいメカニズムを使用しています.
- この戦略は,発達パターンの正確な空間的制御を可能にします.
さらに関連する動画
07:15A Cell-based Assay to Investigate Non-muscle Myosin II Contractility via the Folded-gastrulation Signaling Pathway in Drosophila S2R+ Cells
Published on: August 19, 2018
12:27A Pipeline to Investigate the Structures and Signaling Pathways of Sphingosine 1-Phosphate Receptors
Published on: June 8, 2022
関連する概念動画
Hedgehog 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...
Amplifying Signals via Second Messengers
Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...
Cell Signaling Feedback Loops
Positive and negative feedback loops are crucial for regulating biological signaling systems. These feedback loops are processes that connect output signals to their inputs.
Negative feedback loops
Most signaling systems have negative feedback loops that can perform different functions such as output limiter, and adaptation.
Output limiter
Upon receiving an input signal, the cellular response rapidly increases until a threshold is reached. Beyond this threshold, a negative feedback loop...
Negative feedback loops
Most signaling systems have negative feedback loops that can perform different functions such as output limiter, and adaptation.
Output limiter
Upon receiving an input signal, the cellular response rapidly increases until a threshold is reached. Beyond this threshold, a negative feedback loop...
IP3/DAG Signaling Pathway
Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and produces two-second...
Hedgehog 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...
Gene Regulation During Sporulation
Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...
