精子のメチル化プロファイルは,霊長類における表遺伝子遺伝と進化の特徴を明らかにします
Antoine Molaro1, Emily Hodges, Fang Fang
1Howard Hughes Medical Institute, Cold Spring Harbor Laboratory, 1 Bungtown Road, Cold Spring Harbor, NY 11724, USA.
Cell
|September 20, 2011
まとめ
人間の精子とチンパンジーの精子におけるDNAメチル化パターンは,胚性幹細胞 (ESC) と種間において著しく異なっている. DNAメチル化,特にレトロトランスポゾンにおけるこれらの違いは,進化の分岐を強調しています.
科学分野:
- ゲノミクスゲノミクスとは
- エピジェネティクス エピジェネティクス
- 進化生物学の進化生物学について
背景:
- 哺乳類の細胞は,発達中にDNAメチル化による広範な再プログラムを受けます.
- DNAメチル化パターンは,遺伝子調節と細胞のアイデンティティにとって極めて重要です.
研究 の 目的:
- 人間とチンパンジーの精子のDNAメチル化パターンを,胚性幹細胞 (ESC) のものと比較する.
- 生殖細胞と体細胞,そして霊長類の種間のDNAメチレーションの違いを調査する.
主な方法:
- 全ゲノムビスルファイト配列解析 (Whole-genome bisulfite sequencing, WGBS) は,メチロームのプロフィールを作成するために使用されました.
- プロモーターと繰り返し元素におけるメチル化パターンの比較分析.
主要な成果:
- 人間の精子とチンパンジーの精子は,ESCと比較して,特に低メチル化領域では,異なるDNAメチル化プロファイルを示しています.
- レトロトランポゾンメチル化は様々で,一部のサブファミリーは,雄の生殖細胞発達の過程でメチル化を回避する.
- 人間の精子とチンパンジーの精子の間で,プロモーターとレトロトランスポゾンメチル化における有意な差異が発見され,進化的変化を示唆した.
結論:
- DNAメチル化の調節は,男性生殖細胞と体細胞の間で異なっています.
- 霊長類の進化は,DNAメチル化パターンの分岐につながり,ゲノム配列に影響を与えています.
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