Caenorhabditis elegans Wnt経路における遺伝子発現変動のフィードバック制御について
Ni Ji1, Teije C Middelkoop, Remco A Mentink
1Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
Cell
|November 12, 2013
まとめ
Caenorhabditis elegansのニューロブラスト発達の遺伝子発現の変動が研究されました. フィードバックループは,変異性を軽減し,発達的な強さを確保することが判明しました.
科学分野:
- 発達生物学 発達生物学とは
- システム生物学 システム生物学
- 遺伝学 遺伝学とは
背景:
- フェノタイプの異質性は,遺伝的に同一の集団でも,遺伝子発現の多様性から生じる.
- 遺伝子発現の変動を制御する内生的なメカニズムを理解することは,発達強度にとって極めて重要です.
研究 の 目的:
- Caenorhabditis elegans Qニューロブラストの発達を用いて遺伝子発現の変動を制御するメカニズムを調査する.
- Hox遺伝子の発現とその変動性を影響する規制相互作用を特定する.
主な方法:
- Caenorhabditis elegans QニューロブラストのWnt信号に依存した発達を利用した.
- 遺伝子発現分布を分析し,規制ネットワークを特定した.
- 遺伝子発現の変動性を予測するための最小限のモデルを開発した.
主要な成果:
- Caenorhabditis elegansの変異体におけるWnt経路の活性が,神経芽細胞の移動を制御する重要なホックス遺伝子の変異性を増加させた.
- 相互に繋がったポジティブとネガティブなフィードバックループのネットワークが発見されました.
- ポジティブとネガティブなフィードバックは,高いホックス遺伝子発現を維持しながら,変動性を減少させるのに協力した.
結論:
- 遺伝子ネットワークのアーキテクチャは,遺伝子発現の変動性に大きく影響します.
- フィードバックの調節は,遺伝子発現の発達的強度を確保するための重要なメカニズムです.
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