ソマトセンサリー皮質の層4における密度の高いコネクトームの再構築
Alessandro Motta1, Manuel Berning1, Kevin M Boergens1
1Department of Connectomics, Max Planck Institute for Brain Research, D-60438 Frankfurt, Germany.
まとめ
研究者はマウスの脳皮質の回路を大量にマッピングし ニューロンのサブタイプとシナプスの適応を明らかにしました この進歩により,哺乳類の神経回路の詳細なコネクトーム的フェノタイプ化が可能になった.
科学分野:
- 神経科学
- 計算神経科学
- コネクトミックス
背景:
- 哺乳類の脳皮質の詳細な回路構造は ほとんど不明である.
- 3D電子顕微鏡の進歩により 大量のニューロピルのイメージングが可能ですが 密度の高いコネクトームの再構築は瓶頸です
研究 の 目的:
- 哺乳類の脳皮質コネクトームを以前よりも大きく再構築する.
- ニューロンのサブタイプを特定し,再構築された回路内のシナプス特性を分析します.
主な方法:
- 3D電子顕微鏡を用いてマウスバレル皮質層4から約50万立方ミクロメートルの体積を再構築.
- コネクトームデータを分析して,抑制性および刺激性ニューロンサブタイプを抽出する.
- ヘッビアンシナプス重量適応に関連するコネクトームインプリントの定量化.
主要な成果:
- これまでの哺乳類の皮質再構築より300倍もの大きさの コネクトームを再構築しました
- 特定された抑制性および刺激性ニューロンサブタイプは,幾何学的な特徴だけで予測できない.
- 定量化されたシナプス適応は ヘッビアの可塑性と一致し,飽和した長期増強の限界を提供する.
結論:
- 哺乳類の皮質ニューロン回路の局所的に密度の高いコネクトーム的フェノタイプ化のための方法を確立した.
- 神経回路の組織と機能を理解するための大規模なコネクトーム再構築の有用性を実証した.
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