推定腫瘍遺伝子のGASC1はヒストンH3にトリメチル化および二メチル化リシン9を脱メチル化します
Paul A C Cloos1, Jesper Christensen, Karl Agger
1Biotech Research & Innovation Centre, Fruebjergvej 3, 2100 Copenhagen, Denmark.
Nature
|May 30, 2006
まとめ
ヒストン脱メチラゼであるGASC1 (GASC1) で増幅された遺伝子は,抑圧的なH3K9me3マークを除去します. この発見は,GASC1を示唆しています.
科学分野:
- エピジェネティクス エピジェネティクス
- 分子生物学は分子生物学である.
- がん研究 がん研究
背景:
- ヒストンのメチル化,特にH3K9me3/me2は,ヘテロクロマチンの形成と遺伝子サイレンシングに不可欠です.
- H3K9me3は,伝統的に安定した永久的な表遺伝的変異と考えられてきました.
- H3K9me3に結合するHP1タンパク質は,転写抑制を媒介する.
研究 の 目的:
- H3K9me3.3と相互作用するタンパク質を特定するために.
- H3K9me3.3におけるGASC1 (JMJD2C) とそのサブファミリーメンバーの酵素活性を調べる.
- 染色体調節とがん発症におけるGASC1の役割を明らかにする.
主な方法:
- GASC1およびJMJD2ファミリーメンバーのデメチラゼ活性を試験するための生化学的分析 in vitro.
- H3K9me3 / me2,H3K9me1レベル,およびHP1の局所化 in vivo の分析 エクトピックGASC1発現.
- GASC1抑制後の細胞増殖の評価.
主要な成果:
- GASC1および他のJMJD2メンバーは,鉄とアルファ-ケトグルタレートを必要とするH3K9me3/me2デメチラゼとして特定されました.
- GASC1の子宮外発現は,H3K9me3/me2のレベルを低下させ,H3K9me1のレベルをin vivoで増加させた.
- GASC1の枯渇は細胞増殖を阻害し,腫瘍発達の役割を示唆しています.
結論:
- GASC1は,H3K9me3マークを削除する新しいヒストントリメチル脱メチラーゼです.
- GASC1の活動は,ヘテロクロマチン構造と遺伝子発現に影響を与えます.
- ガン発症におけるGASC1の役割は,それを潜在的な治療標的として位置づけています.
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