哺乳類における親のDNAメチロームのプログラミングと遺伝
Lu Wang1,2, Jun Zhang3, Jialei Duan1
1CAS Key Laboratory of Genome Sciences and Information, Chinese Academy of Sciences, Beijing 100101, China.
Cell
|May 13, 2014
まとめ
父親と母親のDNAメチル化パターンは,胚の発達初期に積極的な脱メチル化を経験し,単なる被動的な希釈ではありません. この積極的な再プログラミングは,開発とインプリント制御に不可欠です.
科学分野:
- エピジェネティクスと発達生物学
- ゲノムインプリントング (Genomic Imprinting) とは
- DNAメチル化ダイナミクス
背景:
- 親メチロームの再プログラミングは,哺乳類の胚の発達に不可欠です.
- 以前の仮説では,父による5メチルサイトシン (5mC) 酸化とメチル化塩基の受動的な稀释が示唆されていた.
研究 の 目的:
- 父親と母親のメチローム再プログラミングのメカニズムを調査する.
- 初期胚形成におけるアクティブな脱メチル化と被動的な希釈の役割を決定する.
- 酸化したサイトシン塩基をマッピングし,インプリント制御領域 (ICR) を分類する.
主な方法:
- マウスのゲメット,初期の胚,原始生殖細胞 (PGC) からの単基解像度,アレル特異のDNAメチロームの生成.
- 初期の胚における酸化したサイトシン塩基 (5hmC,5fC) の単塩基解像度マップの作成.
主要な成果:
- 母体ゲノムと父体ゲノムの両方で,5-ヒドロキシメチルシトシン (5hmC) と5-ホルミルシトシン (5fC) を特定しました.
- 5mCまたはその酸化誘導体の改変されていないサイトシンへの変換は,受動的希釈とは関係なく,ほとんどの非メチル化CpGで実証されています.
- すべての既知のインプリント制御領域 (ICR) を生殖系または体型に分類しました.
結論:
- 父親のメチロームと母親のメチロームの大部分は,胚の発達中に活性脱メチル化を受けます.
- 単に受動的な稀释ではなく,活性脱メチル化がメチロームの再プログラムの主なメカニズムです.
- 発見は,表遺伝子遺伝とインプリントの正確な制御に関する洞察を提供します.
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