地元の上皮質のトポロジーによるミトス分裂平面の制御
William T Gibson1, James H Veldhuis, Boris Rubinstein
1Program in Biophysics, Harvard University, Cambridge, MA 02138, USA.
Cell
|February 8, 2011
まとめ
細胞の形状は,上皮組織における細胞分裂方向性に大きな影響を与えます. この研究は,局所的な細胞トポロジーは,動物細胞と植物細胞の両方で,割れ目の平面の方向性を決定することを明らかにしています.
科学分野:
- 発達生物学 発達生物学とは
- 細胞生物学 細胞生物学
- バイオフィジックス 生物物理学
背景:
- 細胞の形状は,ミトス分裂平面の方向性に150年以上影響していることが知られている.
- 細胞の幾何学と表皮質の分裂平面の方向性の複雑な関係は,まだ十分に理解されていません.
- エピテリアの多角形の細胞形は,細胞の詰め込み,成長,分裂を含む複雑な相互作用から生じる.
研究 の 目的:
- 個々の細胞の形が,上皮組織内の隣接する細胞におけるミトス分裂平面の方向性にどのように影響するかを調査する.
- シミュレーションで観察された細胞のトポロジーと分裂平面の方向性の間の相関が,異なる生物の体内において真であるかどうかを決定する.
主な方法:
- 機械的シミュレーションを用いて,多角形の細胞の形状がミトスの隣人指向に及ぼす影響をモデル化しました.
- シミュレーションの結果を検証するために,動物性表皮および植物性表皮の in vivo 分析を行った.
- 観測された効果を制御する根本的な原則を明らかにするために,数学的分析を使用しました.
主要な成果:
- 多角形の細胞の形状が,隣接するミト細胞の長軸方向を体系的に偏っていることを実証した.
- 動物および植物の両方の上皮組織において,局所的な細胞トポロジーと割れ目平面の方向性との強い一貫した相関が確認されました.
- 基本的な包装制約が,割れ目平面の方向性に対するこのトポロジカルな影響の基礎であることを示した.
結論:
- 局部上皮質のトポロジーは,割れ目平面の方向性を決定する重要な決定因子です.
- 細胞トポロジーによって引き起こされる割れ目平面バイアスは,植物や動物の多角形細胞シートで広く見られる現象である.
- この発見は,多細胞生物における細胞分裂の調節に関する新たな視点を提示しています.
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