1p13のコレステロールロカスでSORT1経由で非コーディング変異からフェノタイプへ
Kiran Musunuru1, Alanna Strong, Maria Frank-Kamenetsky
1Cardiovascular Research Center and Center for Human Genetic Research, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114, USA.
Nature
|August 6, 2010
まとめ
SORT1遺伝子の近くの一般的な遺伝的変異は,肝臓が非常に低密度のリポタンパク質粒子を生成する方法を変えることで,コレステロールレベルと心臓発作のリスクに影響を与えます. この発見は,リポプロテインの代謝と心血管疾患のリスクを管理するための新しい経路を明らかにします.
科学分野:
- 遺伝学 遺伝学とは
- 分子生物学は分子生物学である.
- 心血管疾患に関する研究
背景:
- 全ゲノム関連研究 (GWAS) では,低密度の脂質タンパク質コレステロール (LDL-C) と心筋梗塞 (MI) に関連した,染色体1p13の場所が特定されました.
- この遺伝的場所と臨床的フェノタイプを結びつける正確な機能的メカニズムは不明のままでした.
研究 の 目的:
- リポプロテイン代謝と心血管リスクにおける1p13ロカスポリモルフィズム (rs12740374) の機能的役割を解明する.
- この変異体が肝臓の遺伝子発現と非常に低密度リポタンパク質 (VLDL) の分泌にどのように影響するかを調査する.
主な方法:
- 人間のコホートと肝細胞の研究の分析.
- CCAAT/エンハンサー結合タンパク質 (C/EBP) の転写因子結合に対するrs12740374ポリモルフィズムの影響を調査する.
- 小型の干渉RNA (siRNA) のノックダウンとSORT1遺伝子のウイルスの過剰発現をマウス肝臓モデルで利用.
主要な成果:
- rs12740374ポリモルフィズムにより,C/EBP結合部位が作られ,肝臓のSORT1遺伝子発現が変化します.
- マウスのSort1調節は,肝臓のVLDL分泌に影響することで,プラズマのLDL-CおよびVLDLレベルに直接影響を与える.
- GWASからの一般的なノンコーディングDNA変異が臨床結果に直接影響することを実証しました.
結論:
- SORT1遺伝子を含むリポタンパク質代謝の新たな調節経路を特定しました.
- 機能的証拠は,リポプロテインの調節を通じてMIリスクを調節する1p13の位置の役割を支持しています.
- 共通の非コーディング遺伝子変異が,複雑なヒト疾患に直接的な影響を与える可能性があることを確立した.
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