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構造に基づくタオパシーの分類

Yang Shi1, Wenjuan Zhang1, Yang Yang1

  • 1MRC Laboratory of Molecular Biology, Cambridge, UK.

Nature
|September 30, 2021
PubMed
まとめ

この研究は,PSPやAGDのような神経変性疾患における 異なるタウ線維構造を明らかにし,これらのユニークなタンパク質の折りたたみに基づいたタウ病の新分類システムを提案しています.

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科学分野:

  • 神経科学
  • 生物化学
  • 構造生物学

背景:

  • タウ病は神経変性疾患で,タウタンパク質がフィラメントに結合することを特徴としています.
  • 以前,アルツハイマー病,ピック病,CTE,CBDにおいて明確なタウ線維構造が特定されていた.

研究 の 目的:

  • 様々なタオパシーにおけるタオフィラメントの構造的多様性を明らかにする.
  • タウフィラメント構造に基づくタウ病の階層的分類を確立する.

主な方法:

  • クリオ電子顕微鏡を用いて,様々なタウ病のタウ線維の高解像度構造を決定した.
  • タウ線維の折りたたみにおける類似性と違いを特定するために,比較的な構造分析が行われました.

主要な成果:

  • 進行性超核性麻痺 (PSP) で新しい3層のタウ線維の折りたたみが見つかりました.
  • 球状状タオパシーは,PSPと類似したタオフィラメント構造を共有しています.
  • アルギロフィリック・グレーン病 (AGD) は,皮質根性変性と同様の4層の折りたたみを示し,老化に関連したタウ・アストログリオパシーでも見られます.
  • AGDに関連したMAPT遺伝子変異は,タウの過剰生産とAGDの折りたたみとの関連を示唆する.
  • イギリスとデンマークの家族性認知症は,アルツハイマー病と年齢関連のタオパシーと,タオフィラメント構造を共有しています.

結論:

  • タウ線維の構造的分類は,タウ病を理解するための新しい枠組みを提供します.
  • この分類は,既存の診断および神経病理学的方法を補完します.
  • この研究は,PSPのケースで中間フィラメント構造を特定し,潜在的な新しいタオパシーエンティティを示唆しました.