今日の人間におけるネアンデルタール人の祖先のゲノム的な風景
Sriram Sankararaman1, Swapan Mallick1, Michael Dannemann2
11] Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115, USA [2] Broad Institute of Harvard and MIT, Cambridge, Massachusetts 02142, USA.
Nature
|January 31, 2014
まとめ
現代人のネアンデルタール人のDNAは,皮膚や髪の毛などの特徴に影響を与え,病気のリスクに影響を与えます. いくつかのネアンデルタール人の遺伝子は,ハイブリッドの子孫の男性生殖能力の低下のために削除されました.
科学分野:
- 遺伝学 遺伝学とは
- パレオゲノミクスとは
- 人間の進化 人類の進化
背景:
- ゲノム研究により,ネアンデルタール人と現代人の交配が確認されています.
- 非アフリカ人の現代のヒトゲノムには,ネアンデルタール人のDNAセグメントが含まれています.
- ネアンデルタール人の遺伝的貢献は,再結合により,典型的には小さい (<100kb).
研究 の 目的:
- 現代人の大きなコホートにおけるネアンデルタール人のハプロタイプを体系的に特定し,分析する.
- ネアンデルタール人のDNAが人間の適応と生物学に及ぼす機能的影響を調査する.
- ネアンデルタール人の祖先が減少した地域の背後にある理由を探求する.
主な方法:
- 推定ネアンデルタール人のハプロタイプは,1,004人のヒトのゲノムを横断した.
- ネアンデルタール人の祖先が多い地域と少ない地域での遺伝子濃縮を分析した.
- ネアンデルタール人のX染色体と男性バイアス表現遺伝子の祖先パターンを調査した.
主要な成果:
- ネアンデルタールアレルの頻度が高い地域は,ケラチン線維基因子に富み,適応を示唆しています.
- 特定されたネアンデルタールアレルは,疾患リスクと関連しています.
- 遺伝子のネアンデルタール人の祖先の減少を観察した,特に丸とX染色体で高度に表現されたもの.
- 減少したネアンデルタール人の祖先は,男性のハイブリッド不妊症に関連した遺伝子と相関しています.
結論:
- ネアンデルタール人のアレルは,特に非アフリカの環境における現代人の適応に寄与しました.
- ネアンデルタール人のDNAは,人間の生物学と病気の感受性に影響を及ぼし続けています.
- ネアンデルタール人のアレルに対する選択は,ハイブリッド個体における男性の生育能力の低下のために起こった可能性が高い.
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