HoxD複合体の遺伝子転置は,規制制御の階層を明らかにする
F van der Hoeven1, J Zákány, D Duboule
1Department of Zoology and Animal Biology, University of Geneva, Switzerland.
Cell
|June 28, 1996
まとめ
脊椎動物のホックス遺伝子は,そのクラスター順序に関連した一時的活性化を示す. Hoxd遺伝子の移転は,共有された規制要素と新しい干渉を明らかにし,高次元の規制がHox遺伝子のクラスタリングを維持することを示唆しました.
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:
- 脊椎動物のホックス遺伝子は,発達に不可欠であり,クラスターに編成されています.
- ホックスクラスター内の遺伝子の活性化は,典型的には,それらの線形配列と相関する特定の時間的および空間的な配列に従います.
研究 の 目的:
- ホックス遺伝子の活性化を制御する規制メカニズムを調査する.
- HoxD複合体内の遺伝子順序と位置の役割を決定する.
- 遺伝子転移が発現パターンと規制相互作用にどのように影響するかを探求する.
主な方法:
- HoxD複合体内の子宮外5'位置に,lacZラベル付きのHoxd転写ユニットを導入する.
- 異なった発達段階における異動遺伝子の発現パターンの分析.
- 肢体や生殖器の突起のような特定の組織における位置依存表現の検査.
主要な成果:
- 移転されたHoxd遺伝子は早期発現が遅れたことを示し,隣接するHoxd-13を模倣した.
- 後の段階では,遠端肢と生殖器の突起における位置依存的発現が明らかになり,共通の規制要素を示唆した.
- 実験により,隣接する遺伝子はシス作用の配列を共有でき,遺伝子の移転が新しい調節干渉を引き起こすことが示されました.
結論:
- 高度な規制メカニズムは,ホックス遺伝子の活性化を制御する.
- 多数のホックス遺伝子には共通の規制メカニズムが利用されています.
- 遺伝子のクラスタリングは,共有されたシス作用配列と規制干渉を含む制約のために保存されます.
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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
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