人間とチンパンジーのゲノムとトランスクリプトームの進化の並列パターンは,ヒトとチンパンジーのゲノムとトランスクリプトームの進化の並列パターンが,ヒトとチンパンジーのゲノムとトランスクリプトームの進化の並列パターンは,ヒトとチンパンジー
Philipp Khaitovich1, Ines Hellmann, Wolfgang Enard
1Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, D-04103 Leipzig, Germany.
Science (New York, N.Y.)
|September 6, 2005
まとめ
人間とチンパンジーのゲノムを比較すると,組織間の遺伝子発現とタンパク質配列の類似パターンが明らかになる. 脳遺伝子は違いが少なく,肝臓遺伝子は違いが多く,進化の制約が異なることを示唆しています.
科学分野:
- ゲノミクスゲノミクスとは
- 進化生物学の進化生物学について
- 比較ゲノミクスとは
背景:
- チンパンジーのゲノムの配列決定は,ヒトのゲノム進化を理解するための貴重なリソースを提供します.
- 人間とチンパンジーのゲノムを比較分析することで,遺伝子の違いとその機能的影響が明らかになる.
研究 の 目的:
- ヒトとチンパンジーの間の遺伝子発現レベルとタンパク質コードの配列を比較する.
- 同性遺伝子の間の遺伝子進化における組織特異性の違いを調査する.
主な方法:
- 人間およびチンパンジーの組織 (脳,心臓,肝臓,腎臓,丸) から得られた遺伝子発現データの比較分析.
- 進化的変化と選択的圧力を特定するために,タンパク質をコードする配列の分析.
主要な成果:
- 遺伝子発現と配列の逸脱パターンは,ヒトとチンパンジーの間で組織全体で類似しています.
- 選択的制約のグラデーションが存在し,脳が最もわずかな分岐を示し,肝臓が最も多く示しています.
- より多くの組織で発現する遺伝子は,より少ない組織で発現する遺伝子より少ない分岐を遂げました.
- 精巣のX染色体遺伝子は,配列と発現の変化の両方に対して,陽性選択の証拠を示しています.
- 脳内の遺伝子は,チンパンジーの系統と比較して,人間の系統により多くの変化を蓄積した.
結論:
- 人間とチンパンジーのゲノム進化は,組織特異的な選択圧力によって影響された保存されたパターンを示しています.
- ネガティブな選択による中性進化は一般的に支持されていますが,特定の遺伝子セット (例えば,丸のX染色体遺伝子) に対してポジティブな選択が示されています.
- 脳遺伝子の進化は,差異が少ないが,ヒトの系統に有利な系統特有の変化の明確なパターンを有している.
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