余剰変異による広範囲のインフルエンザ中和抗体の急速な発達
Leontios Pappas1, Mathilde Foglierini1, Luca Piccoli1
1Insitute for Research in Biomedicine, Università della Svizzera Italiana, Via Vincenzo Vela 6, 6500 Bellinzona, Switzerland.
Nature
|October 9, 2014
まとめ
インフルエンザのヘマグルチニン幹を標的とする広範に中和する抗体は稀です. この研究は,VH1-69アレル多形態主義を含む,重要な遺伝的要素と変異を明らかにし,それらの発達と広範な反応性のために必要である.
科学分野:
- 免疫学 免疫学とは
- ウイルス学 ウイルス学 ウイルス学
- 構造生物学 構造生物学とは
背景:
- インフルエンザワクチンは,ヘマグルチニンヘッドの抗原ドリフトにより,毎年再配列する必要があります.
- 保存されたヘマグルチニン幹を標的とした希少な中和抗体は,普遍的なインフルエンザワクチンの可能性を提供します.
- VH1-69抗体は,抗幹抗体の有望なクラスですが,高度に変異し,普遍的に生成されません.
研究 の 目的:
- 抗幹抗体の特徴とVH1-69クローンの発達経路の解明.
- 大幅に中和するVH1-69抗体を生成するための重要な遺伝的および体的変異の要件を特定する.
主な方法:
- 単一のドナーから得られた197個の抗幹抗体の特徴.
- VH1-69抗体クローンの発達経路の再構築.
- 抗体と抗原の相互作用の構造分析.
主要な成果:
- 初始VH1-69抗体開発に不可欠なポリモルフの生殖系にコードされたフェニララリン (位置54) と保存されたチロシン (位置98 in HCDR3) を特定しました.
- 単一のプロリン-アラニン変異 (HCDR2の位置52a) は,H1抗原への高親和結合に十分であり,迅速な親和成熟を示しています.
- さらに多くの突然変異が蓄積され,反応幅が増加し,最初の突然変異と位置54のフェニララニンが機能的に冗長になった.
結論:
- VH1-69アレル多形態化,VDJ遺伝子再配列,および特定の体内変異は,広範に中和する抗体を生成するために不可欠です.
- これらの抗体に対する親和性成熟プロセスは,予期せぬ冗長性を示し,後の突然変異が以前の突然変異を補償する.
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