グローバル・コントロール・リージョンは,ホックスDクラスタを含む染色体調節ランドスケープを定義します
François Spitz1, Federico Gonzalez, Denis Duboule
1Department of Zoology and Animal Biology, NCCR Frontiers in Genetics, University of Geneva, Sciences III, Quai Ernest Ansermet 30, 1211 Geneva 4, Switzerland.
Cell
|May 7, 2003
まとめ
研究者らは,四肢の発達中にホックスド遺伝子発現を制御する保存されたDNA領域を特定しました. この領域は大きな調節領域として作用し,複数の遺伝子に影響を与え,Ulnaless変異によって破壊されます.
科学分野:
- 発達生物学 発達生物学とは
- 遺伝学 遺伝学とは
- 分子生物学は分子生物学である.
背景:
- 調整されたHoxd遺伝子発現は,手足の発達,特に指の発達において極めて重要です.
- これらの遺伝子を制御する規制メカニズムを理解することは,発達過程の解読に不可欠です.
研究 の 目的:
- 肢体の発達におけるHoxd遺伝子発現を制御する規制DNA配列を特定する.
- 新しく特定された遺伝子であるLunapark (Lnp) の機能と,Hoxd遺伝子とEvx2.2との関係を調査する.
主な方法:
- 特定の発現パターンを持つDNAセグメントを特定するために,ターゲットを絞った強化器-トラップアプローチを使用しました.
- バッファフィッシュの配列を含む,種間DNA保存を分析した.
- ウルナレス変異 (バランスのとれた逆転) が遺伝子調節に与える影響を調査した.
主要な成果:
- Hoxdクラスタの上流のDNA領域を発見し,Lnp,Evx2,およびHoxdパターンを反映した数字とCNSにおけるレポーター遺伝子発現を指示しています.
- この地域は,種間保全が顕著であり,世界的な強化剤のクラスタを含んでいます.
- これらの増強剤は,Ulnaless変異によって破壊される大規模な規制ドメインを定義します.
結論:
- 手足と中枢神経の発達中に,Hoxd遺伝子を含む複数の遺伝子を制御する新しい調節領域を特定しました.
- この発見は,遺伝子特異的な制御のみではなく,場所特異的な調節のモデルを示唆しています.
- この規制領域の保存された性質は,脊椎動物の発達におけるその重要性を強調しています.
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