まとめ
研究者らは,Dras1とDras2が脊椎動物のrasタンパク質と有意な同質性を示し,Ha-rasに類似する3つのドロソフィラ遺伝子を特定した. これは,これらの重要な腫瘍遺伝子の機能ドメインが種を超えて保存されていることを示唆しています.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- 発達生物学 発達生物学について
背景:
- ラス遺伝子は,細胞シグナル伝達の重要な調節者であり,真核生物全体に保存されています.
- ドロソフィラ・メラノガスターは,基本的な生物学的プロセスを研究するための強力なモデル生物として機能します.
研究 の 目的:
- 脊椎動物のハラス・オンコゲンに同質なドロソフィラ遺伝子を特定し,特徴づけること.
- ラス遺伝子の構造と機能の進化的保存を調査する.
主な方法:
- Ha-ras探査機を用いたドロソフィラ・ラスの同類体の分離と染色体マッピング.
- Dras 1 (cDNA) とDras 2 (ゲノムクローン) のヌクレオチド配列決定.
- ドロソフィラ・ラスのタンパク質と脊椎動物のハ-ラスおよびキ-ラスタンパク質の比較配列調整.
主要な成果:
- ハラスの同類であるドロソフィラの3つの遺伝子は,染色体3にマッピングされた.
- Dras 1とDras 2は,21.6kdの予測分子量を持つタンパク質をコードする.
- Dras 1は脊椎動物Ha-rasと75%のアミノ酸ホモロジーを表しており,特にアミノ末端部と中部部部にある.
- Dras 2は50%のホモロジーを示しており,N端の変異があるため,独特のドメインを形成することを示唆しています.
- 両方のドロソフィラの配列はC端で変化を示すが,キラスのエクソン4Bに似ている.
結論:
- ドロソフィラは,脊椎動物に相当する重要な構造的および潜在的機能的保存を持つras遺伝子ホモログを持っています.
- p21タンパク質のN端は,異なる規制または機能領域を表す可能性があります.
- 比較分析により,特にC末端のラス遺伝子ファミリーにおける進化的差異が明らかになった.
さらに関連する動画
10:31The Drosophila Imaginal Disc Tumor Model: Visualization and Quantification of Gene Expression and Tumor Invasiveness Using Genetic Mosaics
Published on: October 6, 2016
07:49Characterize Disease-related Mutants of RAF Family Kinases by Using a Set of Practical and Feasible Methods
Published on: July 17, 2019
関連する概念動画
The Ras Gene
The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a superfamily...
Ras is a superfamily...
Rous Sarcoma Virus (RSV) and Cancer
Rous Sarcoma virus or RSV was discovered by F. Peyton Rous in the year 1911 as a filterable transmissible agent that could cause tumors in chickens. He won a Nobel Prize for this discovery in 1966. His experiments clearly demonstrated that some cancers could be caused by infectious agents and led to the discovery of many more cancer-causing viruses in animals as well as humans.
RSV is a retrovirus that contains two copies of a plus-strand RNA genome. Its genome consists of four main open...
RSV is a retrovirus that contains two copies of a plus-strand RNA genome. Its genome consists of four main open...
Small GTPases - Ras and Rho
Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
Three regulatory proteins control their activity:
Three regulatory proteins control their activity:
MAPK Signaling Cascades
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
Rous Sarcoma Virus (RSV) and Cancer
Rous Sarcoma virus or RSV was discovered by F. Peyton Rous in the year 1911 as a filterable transmissible agent that could cause tumors in chickens. He won a Nobel Prize for this discovery in 1966. His experiments clearly demonstrated that some cancers could be caused by infectious agents and led to the discovery of many more cancer-causing viruses in animals as well as humans.
RSV is a retrovirus that contains two copies of a plus-strand RNA genome. Its genome consists of four main open...
RSV is a retrovirus that contains two copies of a plus-strand RNA genome. Its genome consists of four main open...
The Ras Gene
The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a superfamily...
Ras is a superfamily...
