過剰な翻訳は,自閉症に関連したシナプスおよび行動異常を引き起こす
Emanuela Santini1, Thu N Huynh, Andrew F MacAskill
1Center for Neural Science, New York University, New York, New York 10003, USA.
Nature
|December 25, 2012
まとめ
ユカリオット翻訳開始因子4E (eIF4E) の増加によるタンパク質合成の変化は,マウスの自閉症のような行動を引き起こす. このプロセスを阻害すると,症状が逆転し,因果関係が示唆された.
科学分野:
- 神経科学は神経科学である.
- 遺伝学 遺伝学とは
- 分子生物学は分子生物学である.
背景:
- 自閉症スペクトル障害 (ASD) は,社会的,コミュニケーション的,行動的欠陥を特徴とする複雑な神経発達状態です.
- 変異した翻訳制御と過剰なタンパク質合成は,ASDの基礎となるメカニズムであると仮定されています.
- EIF4E遺伝子を含む染色体4qとの遺伝的リンクは,自閉症の個人に観察されています.
研究 の 目的:
- 自閉症のような行動の発達における,真核細胞の翻訳開始因子4E (eIF4E) の因果的役割を調査する.
- マウスモデルのタンパク質合成,シナプス機能,および行動に対するeIF4Eレベルの増加の影響を探る.
主な方法:
- 遺伝子組み換えマウスは,eIF4E.E.のレベルが上昇した.
- 自閉症に関連する欠陥 (社会的相互作用,繰り返しの行動) を特定するための行動評価.
- 主要な脳の領域におけるシナプス機能の電気生理学的および生化学的分析.
- カップ依存型トランスレーション阻害剤 (4EGI-1) を用いた薬理学的介入.
主要な成果:
- eIF4Eが上昇したマウスは,過剰な上限依存翻訳を示し,反復的な行動や社会的欠陥を含む自閉症のような行動を示した.
- これらの行動の変化は,中央前頭前皮質,ストライアタム,ヒポキャンパスにおけるシナプス機能不全と関連していました.
- トランスレーション阻害剤4EGI-1の脳内静脈内投与により,自閉症のような行動が改善されました.
結論:
- 増加したeIF4Eレベルによって引き起こされる過剰な上限依存変換は,ASDに寄与する潜在的な分子メカニズムです.
- この分子変化がシナプス機能障害と特有の自閉症の行動につながります.
- キャップ依存翻訳をターゲットにすることは,自閉症スペクトラム障害の潜在的な治療戦略を提供します.
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