臓器の再生は,植物における機能的な幹細胞のニッチを必要としません
Giovanni Sena1, Xiaoning Wang, Hsiao-Yun Liu
1New York University, Department of Biology, Center for Genomics and Systems Biology, Silver Building, 100 Washington Square East, New York, New York 10003, USA.
Nature
|February 3, 2009
まとめ
植物の臓器再生は,活発な幹細胞のニッチなしでも起こり得る. 分化細胞は幹細胞のような性質を持ち,臓器の完全な再生を可能にしますが,ニッチは継続的な成長に不可欠です.
科学分野:
- 植物生物学 植物生物学
- 発達生物学 発達生物学とは
- 再生生物学 再生生物学とは
背景:
- 植物は,根と芽の成長を継続するために,幹細胞のニッチを必要とします.
- 臓器生成のために幹細胞のニッチの必要性は,既知の細胞の可塑性にもかかわらず,不明のままです.
研究 の 目的:
- 異なる植物細胞が幹細胞のニッチ活動なしに臓器を再生できるかどうかを調査する.
- 臓器再生のための様々な微分細胞の能力を探求する.
主な方法:
- アラビドプシス・タリアナ (Arabidopsis thaliana) の根の先端の再生システムを使用しました.
- 切除後の細胞宿命の分子および機能的回復を追跡した.
- 幹細胞のニッチ維持に影響を与える突然変異を有する植物における再生を調査した.
主要な成果:
- 細胞のアイデンティティの再指定は,切除から数時間以内に開始されました.
- 特殊な細胞の機能は1日以内に回復しました.
- 臓器再生は,機能的な幹細胞のニッチがない植物でも発生しました.
結論:
- 臓器再生のための幹細胞のような性質は,ニッチに限定されず,植物メリステム内に分布しています.
- 幹細胞のニッチは,無期限の成長には不可欠ですが,最初の臓器再生には欠かせません.
- 幹細胞環境のない再生再プログラミングは,動物のトランスディフェリエンテーションの発見に並行しています.
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