人間とチンパンジーの幹細胞における遺伝的依存の比較的な風景
Richard She1, Tyler Fair2, Nathan K Schaefer3
1Whitehead Institute for Biomedical Research, Cambridge, MA, USA.
Cell
|June 21, 2023
まとめ
ヒトの細胞は CRISPR スクリーンで特定された 繁殖に影響を与える 独特の遺伝的依存性を持っています 細胞サイクル遺伝子の違いが 人間の脳の進化を 説明するかもしれません
科学分野:
- 進化生物学
- ゲノミクス
- 細胞・分子生物学
背景:
- 類人猿の比較研究は 人間の進化の洞察力を与えてくれます
- ヒトと他のヒト類の細胞と遺伝子の違いはよくわかっていない.
研究 の 目的:
- 他の類人猿と比較してヒトの細胞の 異なる遺伝的依存性を調べる
- ホミニン進化の過程で細胞増殖に種特有の影響を及ぼす遺伝子を特定する.
主な方法:
- ゲノム全体のCRISPR干渉スクリーンを用いた比較機能喪失アプローチを使用しました.
- 人間とチンパンジーの多能幹細胞とオランウータンの細胞を比較した.
- 細胞増殖に対する種特有の影響を分析し,75の影響を受けた遺伝子を特定した.
主要な成果:
- 細胞サイクルとリソソーム経路を含む細胞増殖に種特有の影響を及ぼす75の遺伝子を特定した.
- オランウータンの細胞と比較して これらの遺伝子の機能が人間に由来することを決定しました
- CDK2とCCNE1の枯渇に対するヒト特有の強度が,神経原細胞と脳オーガノイドで観察された.
結論:
- ヒトの細胞の進化の過程で 重要な遺伝子のパターンが変化しました
- G1段階の長さの仮説は,人間の脳の拡張のためのメカニズムとして支持されています.
- 種間の細胞と分子の違いを 体系的に発見するためのプラットフォームを確立しました
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