NOD2のフレームシフト変異は,クローン病の感受性に関連しています
Y Ogura1, D K Bonen, N Inohara
1Department of Pathology and Comprehensive Cancer Center, The University of Michigan Medical School, Ann Arbor, Michigan 48109, USA.
Nature
|June 1, 2001
まとめ
NOD2遺伝子の特定の変異は,慢性的な胃腸疾患であるクローン病 (CD) と関連しています. このNOD2遺伝子変異は,細菌の成分に対する免疫反応を低下させ,CD発達の新たな経路を示唆する.
科学分野:
- 遺伝学 遺伝学とは
- 免疫学 免疫学とは
- 胃腸内科 胃腸内科
背景:
- クローン病 (Crohn's disease,CD) は,遺伝的および環境的要因の影響を受ける慢性炎症性胃腸疾患である.
- 染色体16のIBD1という感受性の位置がCDと関連付けられていますが,原因遺伝子は特定されていません.
- IBD1結合領域内に位置するNOD2遺伝子は,植物疾患耐性タンパク質に同質性を持つタンパク質をコードする.
研究 の 目的:
- NOD2遺伝子とクローン病の感受性との関連を調査する.
- 免疫反応に対する特定されたNOD2変異の機能的影響を決定する.
主な方法:
- 伝達不均衡テストとケース・コントロール分析を用いて,NOD2変種とCDとの関連性を評価した.
- バクテリアのリポポリサッカリドに反応する核因子NF-kappaBの活性化に対する野生型および変異性NOD2の影響を評価するために,機能的研究が行われました.
主要な成果:
- NOD2 (3020insC) のフレームシフト変異により,切断されたタンパク質が生成され,クローン病と有意に関連していた.
- 野生型のNOD2タンパク質は,細菌のリポポリサッカリドに反応してNF-kappaBを活性化させ,これは変異したNOD2タンパク質に欠けている機能である.
- 特定されたNOD2変異は,バクテリアの成分に対する先天的な免疫反応を損なう.
結論:
- NOD2遺伝子,特に3020insC変異は,クローン病の感受性において重要な役割を果たしています.
- これらの発見は,生まれながらの免疫系が細菌産物を認識する能力とクローン病の病原性との間に重要な関連があることを示唆している.
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