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活発なDNA脱メチル化の多彩な歴史
Steen K T Ooi1, Timothy H Bestor
1Department of Genetics and Development, College of Physicians and Surgeons of Columbia University, New York, NY 10032, USA.
Cell
|July 1, 2008
まとめ
DNAメチル化パターンは,細胞分裂中に受け継がれます. 哺乳類では,DNAメチルトランスフェラーゼ (DNMT3AとDNMT3B) がDNA脱メチル化を開始し,以前の理解に挑戦する可能性があります.
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.
- 遺伝学 遺伝学とは
背景:
- DNAのサイトシンメチル化パターンは,植物や脊椎動物でミトーシス的に受け継がれます.
- 植物では,5メチルサイトシングリコシラゼと塩基切除修復を用いて脱メチル化を行います.
- 哺乳類の活性DNA脱メチル化メカニズムが提案されているが,まだ議論されている.
研究 の 目的:
- 哺乳類における活性DNA脱メチル化に起因する酵素を調査する.
- DNA脱メチル化の過程におけるDNAメチルトランスファーゼの役割を調査する.
主な方法:
- Natureに掲載された最近の発見のレビュー (Kangaspeska et al., 2008; Métivier et al., 2008).
主要な成果:
- 最近の2つの研究では,DNAメチルトランスファーゼDNMT3AとDNMT3BがDNA脱メチル化を開始することを示唆しています.
- これは,哺乳類の活性DNA脱甲基化の既存のモデルに挑戦しています.
結論:
- DNAメチルトランスフェラーゼは,DNAメチル化痕跡の確立と除去の両方で二重の役割を果たす可能性があります.
- この発見は,哺乳類の表遺伝子調節を理解する上で重要な意味を持つ.
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