人間-チンパンジー-マウスの正統遺伝子トリオから非中立的な進化を推論する

Andrew G Clark¹, Stephen Glanowski, Rasmus Nielsen

¹Molecular Biology and Genetics, Cornell University, Ithaca, NY 14853, USA.

Science (New York, N.Y.)

|December 13, 2003

まとめ

人間とチンパンジーの遺伝子の比較は,進化の重要な変化を明らかにしています. 人間における進化の加速は,重要な生物学的機能とメンデルの疾患と関連している.

科学分野:

進化生物学の進化生物学について
比較ゲノミクスとは
分子進化は分子進化である.

背景:

人間とチンパンジーのゲノムは ~99%の配列同一性を共有しています.
人間とチンパンジーの系統の分岐は,ユニークな進化的変化の洞察を提供します.
比較的な配列分析は,機能的に重要な遺伝子変異を特定するために不可欠です.

研究の目的:

人間とチンパンジーの系統に沿って自然選択を経験した遺伝子を識別する.
人間,チンパンジー,マウスの系統間の核酸代謝のパターンを比較する.
人間における加速進化の機能的影響を調査する.

主な方法:

人間,チンパンジー,マウス (7645遺伝子) の配列遺伝子の解析.
同義語および非同義語 нуклеотиド置換率を推定するために進化モデルを適用する.
機能的傾向を特定するために遺伝子を生物学的カテゴリーに分類する.

主要な成果:

チンパンジーとマウスと比較して,ヒトの血統系に明確な置換パターンを持つ遺伝子のセットを特定しました.
特定の機能クラス,特に嗅覚と核輸送の加速進化が検出されました.
人間の進化を加速した遺伝子が,メジャーなメンデルの疾患とより頻繁に関連していることを発見しました.

結論:

比較ゲノミクスは,ヒトとチンパンジーの進化を区別する重要な適応的変化を明らかにしています.
人間の進化の加速は,重要な生理機能と病気の感受性に影響を与えます.
これらの発見は,ヒト特有の特徴と病気の予備性の遺伝的基盤を強調しています.

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