ホップは珍しいホメオボックス遺伝子で,心臓の発達を調節する
Fabian Chen1, Hyun Kook, Rita Milewski
1Department of Medicine, University of Pennsylvania Health System, Philadelphia, PA 19104, USA.
Cell
|September 26, 2002
まとめ
ホップホメオドメインタンパク質は,心臓の発達に不可欠です. 欠乏すると胚に重度の心不全が生じ,心臓特異的な遺伝子発現を調節する役割が強調される.
科学分野:
- 心血管生物学 心血管生物学
- 発達生物学 発達生物学について
- 分子遺伝学 分子遺伝学
背景:
- ホップは,心臓形成の初期に発現するホメオドメインのタンパク質です.
- ホップはNkx2-5転写因子の下流で機能する.
- 心臓発育におけるその正確な役割については,さらなる解明が必要である.
研究 の 目的:
- ホップタンパク質が心臓の発達における機能を調査する.
- ホップが心臓形成に影響を与える分子機構を決定する.
- ホップの無活性化が心臓の構造と機能に及ぼす影響を分析する.
主な方法:
- ネズミの遺伝子不活性化は,同種の再結合によるものです.
- ゼブラフィッシュ胚における機能的研究.
- タンパク質とタンパク質の相互作用とDNA結合阻害を評価するための生化学的測定法.
主要な成果:
- マウスのホップ不活性化は,重度の心臓の欠陥を持つ部分的に浸透した胚の致死につながる.
- ゼブラフィッシュにおけるホップの抑制は,心臓の発達を妨害し,機能を損なう.
- ホップは,血清応答因子 (SRF) と物理的に相互作用し,DNA結合を阻害することによって,SRF依存の転写を阻害します.
結論:
- ホップは,正常な心臓の発達と機能に不可欠です.
- ホップは,心臓のSRF依存遺伝子発現を調節することによって作用します.
- この研究は,ホップを心臓の形態変異の重要な調節因子として特定しています.
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