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ドロソフィラの嗅覚系による酸感知
Minrong Ai1, Soohong Min, Yael Grosjean
1Molecular Neurobiology Program, Skirball Institute of Biomolecular Medicine, Department of Cell Biology, New York University, School of Medicine, New York, New York 10016, USA.
Nature
|November 19, 2010
まとめ
フルーツハエは,イオノトロプ受容体64a (IR64a) を発現する特定の嗅覚センサーニューロンを使用して酸性を検出します. これらのニューロンを破壊すると,酸の検出と回避が損なわれ,酸を感知するための専用の経路が明らかになります.
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
- 昆虫の感覚生物学について
背景:
- 酸性の知覚を支える感覚的メカニズムは十分に理解されていません.
- 酸には独特の匂いの質があり,しばしば鋭い,鋭い,刺激的と表現されます.
研究 の 目的:
- ドロソフィラ・メラノガスターの嗅覚系における酸検出の細胞および分子基盤を特定する.
- 酸性がどのように感知され,行動反応に変換されるかを調査する.
主な方法:
- ニューロンの活動を監視するために in vivo カルシウム画像を用います.
- 果物ハエのIR64aを発現する,遺伝子操作された嗅覚感覚ニューロン (OSN).
- 酸性および非酸性オドラントに対する生理学的および行動的反応を評価した.
主要な成果:
- IR64aを発現するOSNの特定の集団を特定し,酸に対して高度に選択的である.
- DC4グルメルールに投影するIR64a+ニューロンが酸によって活性化することが示された.
- IR64a+ニューロンまたはIR64a遺伝子の障害は,酸に誘発された反応を損なうが,他のオドラントに対する反応は損なわないことを発見した.
- IR64a+ニューロンの人工刺激が回避行動を誘発することを示した.
結論:
- 確立されたIR64a+ニューロンは,ドロソフィラの周辺酸検出の重要な役割を果たしています.
- 嗅覚系における酸性に対するラベル付き線コードメカニズムの証拠を提供した.
- 特定の化学刺激を検出するイオノトロプ受容体の役割を強調した.
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