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キノコの体出力ニューロンの嗅覚コードの可塑性駆動型個別化
Toshihide Hige1, Yoshinori Aso2, Gerald M Rubin2
1Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, USA.
Nature
|September 30, 2015
まとめ
フルーツフライの嗅覚系における 感覚コード化は 体の出力ニューロン (MBON) で 稀少から相関表現へと移行する. ニューラル・チューニングの個別化には ルタバガ遺伝子が必要で 感覚の入力と 運動の出力を橋渡しします
科学分野:
- 神経科学
- 嗅覚系
- 感覚コード
背景:
- 感覚回路は 刺激特有の活動が少ない 高度な脳領域に 昇ります
- ネットワークが収束する ニューラル回路の下降側が 理解されがちです
- 昆虫のキノコの体 特にドロソフィラは 嗅覚の稀少なコーディングと記憶の 重要なモデルです
研究 の 目的:
- ドロソフィラ菌の第4層の 嗅覚表現を調査する
- キノコの体出力ニューロン (MBON) の感覚コーディング原理を特徴づける.
- 個別化されたニューラルチューニングのメカニズムと意味を探求する.
主な方法:
- ドロソフィラMBONの嗅覚表現の分析
- MBONと半球間のチューニング曲線の比較
- ニューラルチューニングにおけるルタバガ遺伝子の役割の調査.
主要な成果:
- MBONのチューニング曲線は高度に相関しており,以前の回路層と対照的です.
- 匂いの表現は集団レベルで再フォーマットされ ポジティブとネガティブの相関関係が生まれます
- 個々のMBONはハエの間で 異なるチューニングを示しますが 個人の半球内のチューニングは保たれています
- ルータバガ遺伝子に依存する 活発なプロセスです
結論:
- 匂いによるコード化の原理が MBON 層で移行し,相関表現へと進みます.
- この段階では 個別化された神経調節が生まれ 感覚運動マッピングのメカニズムが示唆されます
- ルタバガ遺伝子は 個性を調整する この活発なプロセスにおいて 決定的な役割を果たします
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