関連する実験動画
Updated: Jul 6, 2026

10:24
Xenopus laevis as a Model to Identify Translation Impairment
Published on: September 27, 2015
まとめ
人間のH-rasタンパク質の注射は,Xenopusの卵細胞の成熟を誘発する. 腫瘍性H-rasval12タンパク質は,野生型より著しく強力で,アデニラートサイクラゼによって完全に媒介されない効果があります.
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
- 発達生物学 発達生物学とは
背景:
- Rasタンパク質は,細胞の信号伝達経路の重要な調節体です.
- 卵細胞の成熟は,中性進行を含む重要な発達プロセスです.
- 卵細胞の成熟におけるRasシグナル伝達の役割については,さらなる解明が必要である.
研究 の 目的:
- ヒトのH-rasタンパク質がXenopusの卵細胞の成熟に及ぼす影響を調査する.
- 腫瘍性H-rasval12タンパク質と野生型H-rasタンパク質の効力を比較する.
- H-ras媒介による卵細胞成熟におけるアデニラートサイクラスの関与を調査する.
主な方法:
- 精製されたヒトH-rasタンパク質 (野生型およびH-rasval12) をXenopus卵細胞に注入する.
- ミエオティック進行 (プロフェーズからメタフェーズ) の観察.
- サイクルAMP (cAMP) 濃度の測定とコレラ毒素の影響の評価.
主要な成果:
- 人間のH-rasタンパク質の注射により卵細胞の成熟が誘発される.
- 腫瘍性H-rasval12タンパク質は,野生型のH-ras.より約100倍強力でした.
- cAMP濃度の有意な変化は観察されず,コレラ毒素は部分的にその効果を阻害するのみであった.
結論:
- 人間のH-rasタンパク質は,Xenopusの卵細胞における中性成熟を誘発することができる.
- 腫瘍性H-rasval12変異体は,著しく活性化されています.
- アデニラートサイクラスが,このシステムにおけるH-rasval12効果の主要な媒介者である可能性は低い.
関連する概念動画
Meiosis I
Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
Meiosis II
Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
Meiosis vs. Mitosis
Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...

