66,083 人のゲノムの核埋め込みミトコンドリア DNA 配列
Wei Wei1,2, Katherine R Schon1,2,3, Greg Elgar4
1Department of Clinical Neuroscience, School of Clinical Medicine, University of Cambridge, Cambridge, UK.
Nature
|October 5, 2022
まとめ
ミトコンドリアDNA (mtDNA) は細胞核に継続的に転送され,核-ミトコンドリアセグメント (NUMT) が生成されます. これらのNUMTはmtDNAとは異なって進化し,新しい挿入が生殖系と癌で発生し,ダイナミックなヒトゲノムを形成します.
科学分野:
- ゲノミクス
- 分子生物学
- 進化生物学
背景:
- ミトコンドリアから核へのDNA転送 (核-ミトコンドリアセグメントまたはNUMTを形成する) は,ほとんどのNUMTが古代と考えられるエンドシンビオシスの残骸である.
- 現代のNUMTの形成と進化の風景と動態は,まだ完全に理解されていません.
研究 の 目的:
- ミトコンドリアDNA (mtDNA) の核ゲノムへの進行中の移転を調査する.
- 人口における核ミトコンドリアセグメント (NUMT) の多様性,起源,進化の動態を特徴づける.
- 癌を含む人間の健康における NUMT の役割を調査する.
主な方法:
- 12,509人のがん患者を含む66,083人の全ゲノム配列の分析
- 核-ミトコンドリアセグメント (NUMTs) とその変異シグネチャーの識別と特徴付け.
- NUMTの挿入メカニズムと進化的圧力の調査
主要な成果:
- mtDNAの核への継続的な移転が示され,複雑でダイナミックなNUMTの風景に貢献しています.
- >99%の個体で1,637種類以上のNUMTが特定され,その多くはヒトと猿の差異後に発生した.
- ゲルムラインとがんにおける新たなNUMT形成が観察され,特定のNUMTは腫瘍発現と関連している可能性がある.
結論:
- 人間の核ゲノムには,継続的なDNA転送の結果として,動的で進化する核-ミトコンドリアのセグメント (NUMT) が含まれています.
- NUMTはミトコンドリアDNAと比べて 核挿入メカニズムと選択によって 異なる進化の軌跡と変異パターンを表している.
- NUMTの罹患率と特徴は,個体と癌の種類によって異なり,ゲノム変異と疾患における潜在的な役割を強調しています.
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