人間 と 類人猿 の 尻尾 喪失 の 進化 の 遺伝 的 根拠 に つい て
Bo Xia1,2,3,4, Weimin Zhang5, Guisheng Zhao6,5
1Institute for Computational Medicine, NYU Langone Health, New York, NY, USA. xiabo@broadinstitute.org.
Nature
|February 28, 2024
まとめ
人間の尻尾の喪失は,TBXT遺伝子にAlu要素を挿入することによって進化し,代替スプライシングを引き起こしました. この遺伝的変化は ネズミの尻尾がなくなることだけでなく 神経管の欠陥も引き起こし 進化のトレードオフを強調しました
科学分野:
- 進化生物学
- 遺伝学
- 発達生物学
背景:
- 尾の喪失はホミノイドの 進化の重要な出来事で 二足に繋がる可能性があります
- 人類と類人猿の尾の喪失の遺伝的要因は ほとんど特定されていません
研究 の 目的:
- ホミノイドの尻尾の進化の背後にある 遺伝的メカニズムを調査する
- この進化的変化における TBXT 遺伝子における Alu 要素の挿入の役割を調査する.
主な方法:
- ホミノイドの祖先のゲノムにAlu元素を挿入した分析
- Tbxt遺伝子の異なる同位体を発現するマウスモデルの生成.
- エンジニアリングされたマウスの尾の発達と神経管の形成の観察.
主要な成果:
- TBXT遺伝子のイントロンにAlu要素を挿入すると,ホミノイド特異的な代替スプライシングイベントが生じる.
- エクソンスキップされたTbxtアイソフォームを持つマウスモデルは,尾の減少または縮小を示した.
- ネズミのエクソンスキップTbxtアイソフォームの発現は神経管の欠陥を引き起こした.
結論:
- アルウ元素媒介によるTBXT遺伝子の代替スプライシングは,ホミノイドの尾の喪失の原因である可能性が高い.
- 尾の喪失の進化は,神経管の欠陥のリスクが増加した可能性があります.
- この遺伝的変化は 人間の発達障害の理解に 影響を及ぼします
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