関連する実験動画
Updated: Jul 9, 2026

08:10
Environmentally Induced Heritable Changes in Flax
Published on: January 26, 2011
成長停止特異性遺伝子であるgas1は,成長抑制に関与しています
G Del Sal1, M E Ruaro, L Philipson
1International Centre for Genetic Engineering and Biotechnology, Consortium for Interuniversity Biotechnology Laboratories, Trieste, Italy.
Cell
|August 21, 1992
まとめ
成長停止特異遺伝子1 (ガス1) タンパク質は,細胞サイクル進行を阻害する血膜タンパク質です. ガス1の過剰発現は,SV40変異細胞を除いて,ほとんどの細胞でDNA合成を抑制する.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- バイオケミストリー バイオケミストリー
背景:
- 成長停止特異遺伝子1 (gas1) は,細胞増殖の調節に関与しています.
- ガス1の機能を理解することは,細胞サイクル制御機構を理解するために極めて重要です.
研究 の 目的:
- gas1遺伝子の構造,タンパク質産物,成長調節活性を解明する.
- 細胞サイクル進行と成長抑制におけるガス1の役割を調査する.
主な方法:
- gas1 mRNA構造と予測されたアミノ酸配列の分析.
- gas1 mRNAのインビトロトランスレーション.
- 培養細胞の免疫光研究.
- 構成プロモーターとマイクロインジェクションを用いた遺伝子過剰発現の研究.
- 細胞サイクル分析 (G0からS段階への移行,DNA合成の阻害).
主要な成果:
- gas1タンパク質は,プラズマ膜の統合タンパク質である.
- gas1の発現は成長停止と関連しています.
- ガス1の過剰発現は静止細胞のG0からS段階への血清誘発の移行を阻害する.
- gas1の胎内外発現は,正常な細胞と最も変形したNIH 3T3細胞のDNA合成を阻害する.
- gas1の成長抑制効果は,SV40で変換された3T3細胞で廃止されます.
結論:
- gas1は,細胞成長抑制を制御する負の調節回路の構成要素として機能する.
- gas1は細胞サイクル進行を阻害する重要な役割を果たします.
- 細胞成長に対するgas1の抑制効果は,細胞文脈に依存しており,SV40変形細胞では無効である.
関連する概念動画
Cell Specific Gene Expression
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
Abnormal Proliferation
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
TGF - β Signaling Pathway
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
Activation and Inactivation of G Proteins
Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...
Constitutive and Regulated Gene Expression
Gene expression in prokaryotes is governed by constitutive and regulated systems, allowing cells to balance the production of essential proteins with adaptive responses to environmental changes.Constitutive Gene ExpressionConstitutive, or housekeeping, genes are continuously expressed as they encode proteins vital for fundamental cellular processes. These include enzymes for glycolysis, ribosomal components for protein synthesis, and proteins involved in DNA replication. Their constant...
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...

