APPの突然変異は,アルツハイマー病や年齢関連の認知機能低下から保護します
Thorlakur Jonsson1, Jasvinder K Atwal, Stacy Steinberg
1deCODE genetics, Sturlugata 8, 101 Reykjavik, Iceland.
Nature
|July 18, 2012
まとめ
アミロイドベータ前駆タンパク質 (APP) 遺伝子の特定の遺伝子変異であるA673Tが,アルツハイマー病から保護することが判明しました. この発見は,認知機能の低下を減らすための新しい治療目標を提供します.
科学分野:
- 神経科学は神経科学である.
- 遺伝学 遺伝学とは
- バイオケミストリー バイオケミストリー
背景:
- 西洋諸国では,認知症は60歳以上の人の5%以上に影響し,アルツハイマー病は症例の3分の2を占めています.
- アルツハイマー病の罹患率は年齢とともに著しく増加し,65歳以降の5年ごとにほぼ倍増しています.
- アルツハイマー病のリスクに影響を与える遺伝的要因を特定することは,効果的な介入の開発に不可欠です.
研究 の 目的:
- アミロイドベータ前駆タンパク質 (APP) 遺伝子における低周波のコーディング変異を,アルツハイマー病のリスクへの影響について調査する.
- アルツハイマー病に対する保護を与える可能性のあるAPP遺伝子内の特定の変異を特定する.
主な方法:
- アイスランド人の1795人の全ゲノム配列を解析し,APP遺伝子のコーディング変異を分析した.
- アミロイド原性ペプチド形成に対する特定された変異の機能的影響を評価するために,インビトロ実験が行われました.
主要な成果:
- APP遺伝子では,特定のコーディング変異であるA673Tが特定されました.
- A673T変異は,アルツハイマー病および年齢関連の認知機能低下に対する有意な保護効果を示した.
- 実験室内研究では,A673Tがアミロイド原性ペプチドの形成を約40%減らすことが示されました.
結論:
- A673T変異は,APPのβ分裂を減少させることで,アルツハイマー病を予防できるという強力な証拠を提供します.
- アルツハイマー病および一般的な認知機能低下に対するA673Tの保護メカニズムには,同様の経路が含まれている可能性があります.
- この発見は,アルツハイマー病の予防と治療のためのAPP処理を標的とした治療戦略の開発を支援しています.
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