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進化生物学:ランプリホックス遺伝子との起源
1Division of Zoology, School of Animal and Microbial Sciences, University of Reading, Whiteknights, Reading RG6 6AJ, UK. m.j.cohn@reading.ac.uk
Nature
|March 29, 2002
まとめ
脊椎動物におけるの進化は,下の弓におけるホックス遺伝子発現の喪失と関連している可能性がある. この研究で,ホックス遺伝子の発現がランプリの下の弓で発見され,その欠如がの脊椎動物におけるの発達を容易にしたことを示唆しています.
科学分野:
- 進化的発達生物学 進化的発達生物学
- 脊椎動物の古生物学について
- 遺伝学 遺伝学とは
背景:
- の脊椎動物 (gnathostomes) はを進化させ,捕食的なライフスタイルを可能にしました.
- グナトストームのの発達には下の弓が関与し,典型的にはホックス遺伝子発現が欠けている.
- エクトピックホックス遺伝子発現は,グナトストームにおけるの発達を阻害する.
研究 の 目的:
- 脊椎動物のの進化におけるホックス遺伝子の役割を調査する.
- のない脊椎動物からを持つ脊椎動物への移行の発達基盤を理解する.
主な方法:
- 発育中の (アグナサン) 胚の下アーチにおけるホックス遺伝子発現パターンを調べました.
- 進化的変化を推論するために,アウトグループ種との比較分析を行った.
主要な成果:
- ホックス遺伝子は,ランプリエの胚の発達中の下のアーチで発現していることが判明しました.
- これは,グナトストーム下のアーチにおけるホックス遺伝子発現の典型的な欠如と対照的です.
結論:
- グナトストームにおける下アーチからのホックスの遺伝子発現の喪失は,の進化を促進した重要な出来事であったかもしれない.
- Hox遺伝子の調節を理解することは,脊椎動物の主要なイノベーションの洞察を提供します.
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