独特の遺伝子規制ネットワークは,ヒトの生殖系統のエピジェノームを発達のためにリセットします
Walfred W C Tang1, Sabine Dietmann2, Naoko Irie1
1Wellcome Trust Cancer Research UK Gurdon Institute, Tennis Court Road, University of Cambridge, Cambridge CB2 1QN, UK; Department of Physiology, Development and Neuroscience, Downing Street, University of Cambridge, Cambridge CB2 3EG, UK; Wellcome Trust-Medical Research Council Stem Cell Institute, Tennis Court Road, University of Cambridge, Cambridge CB2 3EG, UK.
Cell
|June 6, 2015
まとめ
人間の生殖系統のエピジェノームの再プログラミングは,DNA脱メチル化とクロマチンの変化を誘発する特定の遺伝子ネットワークによってユニークです. 一部の元素は脱メチル化に抵抗し,世代を超えた表遺伝子遺伝が発達や病気に影響を及ぼす可能性を示唆しています.
科学分野:
- 発達生物学 発達生物学について
- エピジェネティクス エピジェネティクス
- ゲノミクスゲノミクスとは
背景:
- 人間の原始生殖細胞 (hPGCs) の表遺伝的再プログラミングは,発達に不可欠である.
- hPGCsのユニークなトランスクリプションと表遺伝的景観を理解することは極めて重要です.
研究 の 目的:
- hPGCsを制御するトランスクリプションネットワークを明らかにする.
- ヒトの初期生殖線発達におけるDNA脱メチル化を含む,ダイナミックな表遺伝的再プログラミングを特徴づける.
主な方法:
- in vivo hPGCsのベース解像度メチローム分析.
- 多能性および体的特異性遺伝子を含む遺伝子発現パターンの分析.
- DNAメチル化経路とTET媒介ヒドロキシメチル化の調査.
主要な成果:
- 人間のPGCはSOX17とBLIMP1.4によって調節される,体性および多能性遺伝子の共同発現 (TFCP2L1,KLF4) を有する独特の転写プログラムを示しています.
- 総合的な生殖系DNA脱メチル化は,クロマチンの再編,Xの活性化,インプリントの消去とともに,hPGCs (5-7週) で漸進的に発生する.
- 特定のレトロエレメント (例えばSVA) と疾患関連ロシウムはメチル化され続け,不完全な脱メチル化と表遺伝的遺伝の可能性を示しています.
結論:
- hPGCのユニークな転写ネットワークは,胚芽細胞の発達に不可欠な広範な表遺伝子再プログラミングを駆動する.
- 特定の場所での不完全な脱メチル化は,発育と疾患に対する潜在的な現象的影響を持つ世代を超えた表遺伝子遺伝のメカニズムを示唆する.
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