微生物の脳のニューロメア組織:保存され,明確な地域特性が特徴です
F Lucero-Arteaga1,2, A Abrego-Alvarez2, M Clauzure1,3
1Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina.
The Journal of comparative neurology
|February 18, 2026
まとめ
進化の相違によって,コウモリとネズミの脳の違いが生まれました. 組織が保全されているにもかかわらず,コウモリはネズミと比較して,大脳体や小脳のような小さな脳領域を持っています.
科学分野:
- 比較神経解剖学について
- 進化生物学の進化生物学について
- 哺乳類の脳の進化について
背景:
- コウモリ (Microchiroptera) とネズミ (Muridae) は,約8500万年前に分離した.
- 脳の地域的な変化を理解することは,哺乳類の進化を研究するのに役立ちます.
- この研究では,コウモリ進化の代表者として,マイオティス・マイオティス (Myotis myotis) とタダリダ・ブラジリエンシス (Tadarida brasiliensis) という2種類の微生物種を使用しています.
研究 の 目的:
- 蝙蝠とネズミの間の進化的分岐が,重要な地域的な脳変化をもたらしたかどうかを調査する.
- 2つの微生物種とネズミの脳構造をプロゾーマー的枠組みを使って比較する.
- 進化の歴史による差異を示す特定の脳領域を特定する.
主な方法:
- ニューロメアパーティションからの脳誘導体の比較分析.
- 脳の領域の識別のためのプロソメア・フレームワークを利用した.
- テストされたチロシンヒドロキシラーゼ (TH) 陽性プロセスと特定の脳の領域の経路.
主要な成果:
- 蝙蝠とネズミの間で基本的な神経分子組織が保存されている.
- 蝙蝠は,ネズミと比較して,より小さなコルパス・カルロスウム,アイソコートクス,光学キアスマ,小脳を示しています.
- ベースプレートにおけるチロシンヒドロキシラーゼ (TH) 発現パターンは似ていたが,メディアル・ヘブンヌラ (MHb) はコウモリ種間の異なるTH発現を示した.
結論:
- 蝙蝠とネズミの間の8500万年の進化的分裂は,顕著な地域的な脳の解剖学的違いを引き起こしました.
- 地域的な違いがあるにも関わらず,基本的なモジュール型の脳計画が保たれています.
- 中央のヘブンヌラ (MHb) の差異的なTH発現は,コウモリ内の特定の進化的適応を強調しています.
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