中枢 神経回路 の 進化 は,ドロソフィラ の 配偶者 選択 の 基礎 に ある
Laura F Seeholzer1, Max Seppo1, David L Stern2
1Laboratory of Neurophysiology and Behavior, The Rockefeller University, New York, NY, USA.
Nature
|July 12, 2018
まとめ
特定の種の求婚は フェロモンの処理に依存しています 検出ではなく 神経回路の違いが,ドロソフィラ・メラノガスターとドロソフィラ・シミュランスの雄に 同じフェロモンに対して 反対の反応を引き起こし,生殖分離を引き起こします.
科学分野:
- 神経倫理学
- 進化生物学
- 化学エコロジー
背景:
- 交際の儀式は 密接に関係する種間の 繁殖の隔離を維持するために 極めて重要です
- フェロモンは,種特有の求愛行動と配偶者認識において重要な役割を果たします.
研究 の 目的:
- フェロモン7,11-ヘプタコサディエンがドロソフィラ・メラノガスターとドロソフィラ・シミュランスの雄性における相反する求愛反応を誘発する方法を調査する.
- 種特有のフェロモン知覚と行動出力の基礎となる神経機構を特定する.
主な方法:
- 男性のD. melanogasterとD. simulansにおけるフェロモン検出と信号処理の比較分析
- 電気生理学的記録と 神経回路マッピング フェロモン信号経路を追跡する
- 特定のフェロモンに対する 求愛反応を評価する行動分析
主要な成果:
- 両種の雄は7,11-ヘプタコサディエンを 似たような周辺感覚神経を使って検出する.
- フェロモン信号が中央ニューロン (P1ニューロン) に差分的に伝播することで,求愛行動が制御されます.
- 神経刺激と抑制のバランスの変化が フェロモンの効果を 魅力から反発へと変えます
結論:
- 特定の種のフェロモン反応は,周辺の検出メカニズムが保存されているにもかかわらず,中枢神経回路の変化によって進化することができます.
- ニューラル経路の多様化により 行動反応が環境のシグナルに 柔軟に適応できます
- この研究は,生殖的孤立と行動の逸脱の進化における 神経回路の可塑性の役割を強調しています.
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