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CMT2D神経症は,グリシル-tRNA合成酵素の新型結合活動と関連している
Weiwei He1, Ge Bai2, Huihao Zhou1
1Departments of Chemical Physiology and Cell and Molecular Biology, The Scripps Research Institute, La Jolla, California 92037, USA.
Nature
|October 28, 2015
まとめ
グリシル転送RNA合成酵素 (GlyRS) の変異は,新しい結合活動を可能にすることで,シャルコ・マリー・トゥース病2Dを引き起こす. この異常なGlyRSはニューロピリン1と結合し,生存信号を遮断し,モーターニューロンの退化を引き起こします.
科学分野:
- 神経科学
- 遺伝学
- 分子生物学
背景:
- シャルコ・マリー・トゥース病 (CMT) は,効果的な治療法がない一般的な遺伝性神経病です.
- CMTタイプ2D (CMT2D) は,タンパク質合成に不可欠な遺伝子であるグリシル転送RNA合成酵素 (GlyRS) をコードするGARSの支配的な変異から生じる.
- CMT2Dにおけるモーターニューロンの選択的脆弱性は,GlyRSの至る所で発現しているにもかかわらず,十分に理解されていません.
研究 の 目的:
- CMT2Dに関連したGlyRS変異が選択的なモーターニューロン退化につながる分子メカニズムを解明する.
- 変異したGlyRSによって破壊された特定の分子相互作用と経路を特定する.
主な方法:
- 変異したGlyRS (GlyRS ((CMT2D)) の新型結合活性を調べた.
- GlyRS ((CMT2D)) とニューロピリン1 (Nrp1) 受容体の相互作用を分析した.
- 血管内皮成長因子 (VEGF) 信号伝達に対するGlyRS (CMT2D) の影響を評価した.
- Nrp1とVEGF発現の遺伝子操作を施したマウスモデルを使用した.
主要な成果:
- CMT2D変異はGlyRSの構造変化を誘導し,ネオモルフ結合活性を与える.
- GlyRS ((CMT2D) はNrp1に異常に結合し,VEGF結合を競争的に抑制する.
- Nrp1の遺伝的減少は,マウスのCMT2D症状を悪化させる.
- 強化されたVEGF発現はCMT2Dモデルにおける運動機能を改善する.
結論:
- CMT2Dの選択的病理は,GlyRS ((CMT2D) のNrp1へのネオモルフ結合と関連しており,VEGFシグナル伝達を阻害する.
- VEGF-Nrp1シグナリング軸は,CMT2Dの潜在的な治療目標です.
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