トランスクリプションインテグレータp300が欠けているマウスにおける遺伝子用量依存の胚発達および増殖欠陥
1Dana-Farber Cancer Institute and Harvard Medical School, Boston, Massachusetts 02115, USA.
Cell
|May 20, 1998
まとめ
トランスクリプションコアクティベーターp300は,マウスの発達に不可欠です. 欠乏すると胚の死亡や細胞増殖や臓器形成の欠陥が生じ,その重要な役割が強調される.
科学分野:
- 分子生物学は分子生物学である.
- 発達生物学 発達生物学とは
- 遺伝学 遺伝学とは
背景:
- 転写共活性化剤p300とその家族メンバーCBPは,多数の信号依存遺伝子発現イベントを調節する.
- ヒストンアセチルトランスフェラーゼ (HAT) アクティビティは,p300とCBP機能の重要な特徴です.
研究 の 目的:
- 機能的なp300遺伝子が欠けているマウスを生成し,分析することによって,哺乳類の発達におけるp300の重要な役割を調査する.
- 胚の発達,細胞増殖,および転写調節に対するp300欠乏の影響を決定する.
主な方法:
- 非機能的なp300遺伝子を持つ遺伝子組み換えマウスの生成 (p300ノックアウト).
- 胚死亡率とp300のヌリジゴスおよびヘテロジゴス胚における発達障害の分析.
- p300欠乏胚から派生した細胞における細胞および転写欠陥の特徴化.
主要な成果:
- 機能的なp300 (p300 nullizygous) が欠けているマウスは,妊娠9日から11.5日の間に胚の死亡率を示した.
- 観察された発達障害には,神経形成の障害,細胞増殖の減少,心臓異常が含まれていました.
- p300欠乏の胚細胞は,特異的な転写欠陥と劣った増殖を示した.
- 驚くべきことに,p300ヘテロジゴトは,胚の致命性を有意に示した.
- p300とCBPの双重ヘテロジゴシティは,常に胚死をもたらし,遺伝子用量感受性を示した.
結論:
- マウスの胚の発達は,p300とCBPの投与に対して非常に敏感です.
- 遺伝的証拠は,ヒストンアセチルトランスフェラーゼ活性を持つコアクティベーターであるp300が,哺乳類の細胞増殖と全体的な発達に不可欠であることを確認しています.
- これらの発見は,基本的な生物学的プロセスにおけるp300の重要な重要性を強調しています.
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