Id2,Tbx5,Nkx2-5を含む分子経路は,心臓伝導システムの発達に必要なものです
Ivan P G Moskowitz1, Jae B Kim, Meredith L Moore
1Department of Genetics, Harvard Medical School, Boston, MA 02115, USA.
Cell
|July 3, 2007
まとめ
研究者らは,心臓伝導システムにとってId2が極めて重要であると特定しました.
科学分野:
- 心臓病学 心臓病学
- 分子生物学は分子生物学である.
- 発達生物学 発達生物学について
背景:
- 心臓伝導系は,心筋の特殊な細胞を通して心拍を調整する.
- その分子基盤を理解することは,心臓リズム障害の診断と治療の鍵です.
研究 の 目的:
- ネズミの心室伝導システムの発達と機能に不可欠な遺伝子を特定する.
- 導電システムの仕様を規制する規制ネットワークを明らかにする.
主な方法:
- 転写プロファイリングのためにマイクロ解剖と遺伝子発現の連続分析 (SAGE) を利用しました.
- 機能的影響を評価するために,Id2欠乏したマウスを生成し,分析しました.
- in vitro プロモーター分析と in vivo 遺伝子発現研究を行いました.
主要な成果:
- 伝導系に特異的に発現する遺伝子としてId2を特定した.
- Id2欠乏症は,左束の分岐ブロックを含む構造的,機能的異常を引き起こしました.
- Nkx2-5およびTbx5転写因子はId2発現を調節する.
- 組み合わせたTbx5とNkx2-5またはTbx5とId2のハプロイン不全により,胚の伝導系形成が妨げられました.
結論:
- Tbx5,Nkx2-5,Id2を含む分子経路は,心室筋細胞を心臓伝導系系統に指定するために不可欠です.
- この経路は,正常な心臓の電気的活動と発達に不可欠です.
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