HMGA1遺伝子と2型糖尿病の機能的変異体
Eusebio Chiefari1, Sinan Tanyolaç, Francesco Paonessa
1Dipartimento di Medicina Sperimentale e Clinica G. Salvatore, Università di Catanzaro Magna Græcia, Viale Europa, Germaneto Catanzaro, 88100 Italy.
JAMA
|March 3, 2011
まとめ
機能的 高移動性グループA1 (HMGA1) 遺伝子変異は,2型糖尿病 (DM) と関連しています. これらのHMGA1変異は,インスリン受容体 (INSR) 発現の低下につながり,ヨーロッパの祖先の個体においてDMの発症に貢献します.
科学分野:
- 遺伝学とゲノミクス
- 内分泌学と新陳代謝について
- 分子生物学は分子生物学である.
背景:
- 高移動性グループA1 (HMGA1) タンパク質は,インスリン受容体 (INSR) 遺伝子発現を調節する.
- 以前,インスリン抵抗性,INSR発現の低下,および2型糖尿病 (DM) の患者で機能的なHMGA1変異体が特定されました.
- HMGA1は代謝調節と糖尿病の病原性において重要な役割を果たします.
研究 の 目的:
- ハイモビリティグループA1 (HMGA1) の遺伝子変異体と2型糖尿病 (DM) の関連性を調査する.
- 異なる集団におけるHMGA1遺伝子変異の有病率と影響を決定する.
- INSR発現に対するHMGA1変異の機能的影響を調査する.
主な方法:
- 3つの集団 (イタリア人,米国人,フランス人) で,白人ヨーロッパ人の祖先の7,000人以上の個人を対象としたケース・コントロール研究.
- 2型DM患者と健康な対照群におけるゲノムDNAシーケンシングとHMGA1遺伝子の変異分析.
- HMGA1およびINSRメッセンジャーRNA (mRNA) と周辺血液細胞およびリンパ芽細胞のタンパク質レベルを測定する.
主要な成果:
- 特定の機能的なHMGA1変種であるIVS5-13insCは,すべての3つの集団の2型DM患者において有意に頻繁であった.
- HMGA1変異の有病率は,対照群と比較して2型DM症例で高く,確率比は1.64から15.77.7までであった.
- HMGA1遺伝子変異は,HMGA1およびINSRのmRNAおよびタンパク質レベルが40〜50%低下するとの関連があり,これはHMGA1cDNAトランスフェクションによって修正される可能性があります.
結論:
- 機能的なHMGA1遺伝子変異は,白人ヨーロッパ人の祖先の個人に2型糖尿病のリスクの増加と有意に関連しています.
- これらの変異は,インスリン受容体の発現と機能を損なうことにより,II型糖尿病に寄与する.
- HMGA1遺伝子変異は,2型糖尿病の発症における潜在的な遺伝因子です.
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