主な嗅覚経路における嫌悪的な匂いの非冗長なコーディング
Adam Dewan1, Rodrigo Pacifico, Ross Zhan
1Department of Neurobiology, Northwestern University, Evanston, Illinois 60208, USA.
Nature
|April 30, 2013
まとめ
トレースアミン関連受容体 (TAARs) は,ネズミの先天的に嫌悪的な匂いを検出するために不可欠です. TAAR遺伝子,または単一の TAAR4 遺伝子を削除すると,揮発性アミンや捕食者の尿臭に対する嫌悪感がなくなる.
科学分野:
- 神経科学は神経科学である.
- 嗅覚系の研究 嗅覚系の研究
- 遺伝学 遺伝学とは
背景:
- 嗅覚は多くの種の生存に不可欠である.
- 哺乳類の主な嗅覚系は,嗅覚受容体 (ORs) と微量アミン関連受容体 (TAARs) を利用する.
- 組み合わせた匂いのコーディングは嗅覚球で起こりますが,個々の受容体遺伝子の貢献は不明です.
研究 の 目的:
- 嗅覚におけるTAARsの役割を調査する.
- 個々の嗅覚受容体遺伝子の匂いの知覚への貢献を決定する.
- 特定の匂いを検出するTAARの機能を特定する.
主な方法:
- ネズミの嗅覚タール遺伝子ファミリーの遺伝子削除.
- マウスにおける1つのTaar遺伝子 (Taar4) の遺伝的削除.
- 揮発性アミンや捕食者の尿に対する嫌悪感を測定するための行動分析.
主要な成果:
- Taar遺伝子ファミリーの削除により,低濃度の揮発性アミンに対する嫌悪感が排除されました.
- Taar4遺伝子の削除だけで,この嫌悪感も解消されました.
- アヴェルシブアミンは,嗅覚系において非冗余的に表れています.
- 個々の主要な嗅覚受容体遺伝子は,匂いの知覚に大きく影響する.
結論:
- TAARsは,本質的に嫌悪的な匂いの高感度検出において重要な役割を果たします.
- 特定のTAARは,生物学的に重要な嗅覚信号を認識するために不可欠です.
- 嗅覚の知覚は,個々の受容体遺伝子の異なる貢献に依存しています.
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