ドロソフィラタンパク質フォスファタゼ2Aの55kdの調節サブユニットは,アナフェーズに必要である
R E Mayer-Jaekel1, H Ohkura, R Gomes
1Friedrich Miescher-Institut, Basel, Switzerland.
Cell
|February 26, 1993
まとめ
PR55 (タンパク質フォスファタゼ2A55 kd調節サブユニット) のドロソフィラ遺伝子は,胚の発達に極めて重要です. 染色体分離に影響を与える変異は,この遺伝子によって救出され,細胞分裂におけるその役割を強調します.
科学分野:
- 発達生物学 発達生物学とは
- 遺伝学 遺伝学とは
- 細胞生物学 細胞生物学
背景:
- ドロソフィラメラノガスターのタンパク質フォスファタゼ2A55 kd調節サブユニット (PR55) の遺伝子は85Fに位置しています.
- この遺伝子は,異なる母体および子宮の発現パターンを有する,異なったスプライスされたトランスクリプトの合成を指揮する.
研究 の 目的:
- ドロソフィラPR55遺伝子の発現パターンと機能を調査する.
- 細胞分裂におけるPR55の役割と,アナフェーズ解像に影響する突然変異との関連を決定する.
主な方法:
- 胚,幼虫,成人組織におけるトランスクリプトの局所化による遺伝子発現パターンの分析.
- 異常なアナフェーズ解像度 (aar) の突然変異を補完するために,野生型のPR55遺伝子を用いた遺伝的救済実験.
- アール変異体におけるミトスフィギュアの細胞学的検査で,染色体異常を特徴付ける.
主要な成果:
- 母性PR55RNAは初期の胚に豊富に存在し,細胞化によって減少する一方,胚性トランスクリプトは胚性神経系と性腺に顕著に存在します.
- トランスクリプトは,幼虫の円盤,,脳の増殖センターにも見つかります.
- 異常なアナフェーズ解像度 (aar) の変異は,野生型のPR55遺伝子によって救出されます.
- aar変異者は,アナフェーズ中に特徴的な遅滞染色体と,2つのセントロメリック領域とのブリッジング染色体を示します.
結論:
- ドロソフィラPR55遺伝子は,特に神経系と性腺において,発達において重要な役割を果たします.
- PR55はミトーシス中の適切な染色体分離に不可欠であり,アール変異性フェノタイプを救うことが証明されています.
- この研究では,PR55がアナフェーズ解像度の重要なレギュラーであると特定されています.
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