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TDP-43の損失とALSリスクのSNPは,UNC13Aのミスプライシングと枯渇を誘導する
Anna-Leigh Brown1, Oscar G Wilkins1,2, Matthew J Keuss1
1UCL Queen Square Motor Neuron Disease Centre, Department of Neuromuscular Diseases, UCL Queen Square Institute of Neurology, UCL, London, UK.
Nature
|February 24, 2022
まとめ
UNC13A遺伝子の変異は ALSやFTDのような神経変性疾患のリスクを高めます TDP-43タンパク質の枯渇は,UNC13Aエクソンの含有を引き起こし,タンパク質の損失と疾患の悪化につながります.
科学分野:
- 神経科学
- 遺伝学
- 分子生物学
背景:
- アミオトロフィック横筋硬化症 (ALS) とフロントテンポラル認知症 (FTD) は関連神経変性疾患である.
- 両方の疾患はRNA結合タンパク質 TDP-43の誤局によって特徴付けられています.
- UNC13A遺伝子の変異は,ALSとFTDのリスク増加と関連しています.
研究 の 目的:
- TDP-43,UNC13A,およびALS/FTDの病原性を調査する.
- UNC13Aの変種が神経変性疾患の危険に寄与するメカニズムを解明する.
主な方法:
- 培養細胞におけるTDP-43の減少は,UNC13Aスプライシングへの影響を観察する.
- 患者の細胞と死後の脳/脊髄組織におけるUNC13Aポリモルフィズム解析
- UNC13Aタンパク質レベルへの影響
主要な成果:
- TDP-43の枯渇は,UNC13Aに神秘的なエクソンが含まれるのを誘導し,ナンセンス媒介の腐敗とUNC13Aタンパク質の損失につながります.
- ALS/FTDリスクに関連する一般的なUNC13Aポリモルフィズムが,TDP-43結合部位と重なり合っている.
- これらのポリモルフィズムは,細胞とヒトの脳/脊髄サンプルにおける暗号的なエクソン含有度を高めます.
結論:
- 核TDP-43機能の喪失は ALSとFTDと遺伝的に関連しています
- UNC13Aの変種は,暗号的なエクソン含有が強化されたことにより,TDP-43の機能の低下の結果を悪化させる.
- このメカニズムは,TDP-43のタンパク質病変に対する潜在的な治療目標を提供します.
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