網膜の入力により,視覚的地形図の並べ替えが指示されます
Jason W Triplett1, Melinda T Owens, Jena Yamada
1Department of Molecular, Cell, and Developmental Biology, University of California-Santa Cruz, Santa Cruz, CA 95064, USA.
Cell
|October 7, 2009
まとめ
脳のマップは,協調された神経活動を使用して並べられます. 複製された視覚マップを持つ遺伝子組み換えマウスは,皮質からの接続が,発達活動パターンによって導かれ,これらの地図と一致することを示しています.
科学分野:
- 神経科学は神経科学である.
- 発達生物学 発達生物学について
- 視覚システム研究 視覚システム研究
背景:
- トポグラフィックマップは脳の感覚情報を表現し,隣接するニューロンは隣接する刺激に反応する.
- 視覚系では,上部コリキュルスは,網膜と第一視野皮質 (V1) から並べられた地形投影を受けます.
- このアラインメントのメカニズムには,軸索誘導分子または視覚空間表現に基づく網膜マッチングが含まれます.
研究 の 目的:
- 皮質コリキュラー投影が網膜コリキュラー地図と一致するメカニズムを調査する.
- 配列が分子梯度または活動依存のマッチングに依存するかどうかを判断する.
主な方法:
- 複製された機能的な網膜コリキュラーマップと単一のV1マップを持つ遺伝子組み換えマウスを利用しました.
- 投影パターンを分析するために,解剖学的な追跡技術を採用した.
- マップアラインメントにおける発達中の自発的な神経活動の役割を観察した.
主要な成果:
- コルティココリキュラー投影は,複製されたレチノコリキュラーマップと整列するために二分化しました.
- この調整は,発達中の自発的な神経活動の正常なパターンに依存していた.
- 偶発的な活動パターンが,収束するマップの並び合わせに不可欠であることを示した.
結論:
- 脳内の収束する地形図は,一致する活動パターンを利用して,並べ替える.
- この発見は,ニューラルマップが正確な構造的組織化をどのように達成するかについての一般的なモデルを示唆しています.
- 機能的な脳回路の確立における発達神経活動の重要な役割を強調しています.
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