FTO内の肥満に関連した変異は,IRX3との長距離機能的接続を形成します
Scott Smemo1, Juan J Tena2, Kyoung-Han Kim3
11] Department of Human Genetics, University of Chicago, Chicago, Illinois 60637, USA [2].
Nature
|March 21, 2014
まとめ
FTO遺伝子イントロンの肥満リスク変異は,IRX3遺伝子調節と関連しており,体質と代謝に影響を及ぼしています. マウスのIRX3欠乏症は,体重と脂肪を大幅に減らし,代謝制御におけるその役割を強調する.
科学分野:
- 遺伝学 遺伝学とは
- メタボリック疾患
- 分子生物学は分子生物学である.
背景:
- 全ゲノム関連研究 (GWAS) は,FTO遺伝子変異を肥満と2型糖尿病 (T2D) リスクと関連付けています.
- 以前の研究では,FTO発現が体質に影響することを示していたが,非コーディング変異のメカニズムは不明のままだった.
研究 の 目的:
- 肥満に関連したFTO変種と遺伝子調節の機能的な関連性を調査する.
- これらの調節要素がターゲットとする特定の遺伝子と,体質制御におけるその役割を特定する.
主な方法:
- クロマチン構成のキャプチャとリポーターアッセイで,遺伝子相互作用を特定します.
- 人間の脳組織とノックアウトマウスモデルにおける遺伝子発現の分析.
- 体重,組成,代謝率を含む,Irx3欠乏マウスのフェノタイプの特徴.
主要な成果:
- 肥満に関連したFTO領域は,IRX3とFTOのプロモーターと,メガデータベースの距離を越えて相互作用する.
- FTO領域のエンハンサーは,FTOではなくIRX3発現を調節する.
- FTOではなくIRX3発現は,人間の脳における肥満に関連したSNPと相関しています.
- Irx3欠乏したマウスは,脂肪の減少と代謝の増加のために体重が減った (25〜30%).
- 支配的-負のIrx3の下垂体発現は,これらの代謝現象型を模倣する.
結論:
- IRX3は,肥満に関連したFTO変異の長距離機能的標的である.
- IRX3は,体質と組成の新たな決定因子であり,下垂体調節を介して作用する.
- この発見は,肥満と代謝障害の遺伝的調節に関する新しい洞察を提供します.
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