ドロソフィラの胚形成の3つのプラスト皮膚後の細胞周期は,G2で弦によって制御されています
1Department of Biochemistry and Biophysics, University of California, San Francisco 94143.
Cell
|August 10, 1990
まとめ
ドロソフィラの遺伝子文字列 (stg) は,胚の発達中の細胞周期のタイミングを,ミトーシスを活性化することによって制御する. 驚くべきことに,STGの発現を変化させることは,生存能力やパターン形成に影響を与えず,発達強度を示唆しました.
科学分野:
- 発達生物学 発達生物学とは
- 細胞サイクル調節 細胞サイクル調節
- 遺伝学 遺伝学とは
背景:
- ドロソフィラのストリング (stg) ローカスは,p34cdc2タンパク質キナーゼを活性化することによってミトーシスを開始するために重要である.
- stgは初期の胚性ミトーシスに不可欠であり,その転写パターンは細胞分裂のタイミングと相関しています.
研究 の 目的:
- ポストブラストダーム発育 (サイクル14〜16期) 中の細胞周期の微分調節におけるstgの役割を調査する.
- stgがg2段階の細胞サイクルタイミングを制御するかどうかを判断する.
主な方法:
- 熱ショックプロモーターを用いて,ドロソフィラの胚でstgmRNAを発現させる.
- G2細胞における細胞サイクル進行 (ミトーシスとS相) に誘発されたstg発現の影響を観察した.
主要な成果:
- ポストブラストダームの発達中の細胞周期の微分調節は,G2段階で起こります.
- 熱誘導性stg発現は,G2細胞におけるミトーシスとS相の両方を誘発し,stgがタイミングにおける役割を確認する.
- stg操作による正常なミトのパターンの変化は,パターンの形成や生物の生存能力を損ねなかった.
結論:
- stg遺伝子は,ドロソフィラの胚発達の特定の段階において,細胞周期のタイミングの微分を決定する重要な調節因子である.
- 複雑な胚性ミトスのパターンは,パターンの形成や生存の多くの側面にとって不可欠ではないので,発達的な可塑性を示す.
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