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進化的骨盤縮小の遺伝的および発達的基礎は,三脊椎のスティックバックの進化的骨盤縮小である
Michael D Shapiro1, Melissa E Marks, Catherine L Peichel
1Department of Developmental Biology and HHMI, Stanford University School of Medicine, Stanford, California 94305-5329, USA.
Nature
|April 16, 2004
まとめ
三脊椎スティックルバック魚の骨盤縮小は,Pitx1遺伝子によって制御されています. Pitx1におけるタンパク質の変異ではなく,規制の変化が,後肢喪失の進化を駆動する.
科学分野:
- 進化生物学の進化生物学について
- 発達遺伝学 発達遺伝学
- エボ・デボ (Evo-Devo) とは
背景:
- 後肢の喪失は,様々な動物の系統で何度も進化した.
- 骨盤縮小の遺伝的基盤は,自然集団ではほとんど不明のままである.
研究 の 目的:
- 骨盤帯の縮小に起因する遺伝的要因と分子メカニズムの特定を,三脊椎のスティックバックで試みた.
- この進化過程におけるPitx1遺伝子の役割を調査する.
主な方法:
- 完全な骨盤構造と骨盤構造の欠如を持つ三脊椎スティックルバック魚の間の遺伝的交配を実施しました.
- 骨盤縮小に関連する染色体領域を特定するために,全ゲノムにわたるリンクマッピングを行いました.
- 骨盤を縮小した個体におけるPitx1遺伝子発現パターンとタンパク質配列を分析した.
主要な成果:
- 骨盤縮小は,主にPitx1遺伝子を含む主要な染色体領域によって制御され,追加の小領域があります.
- 骨盤縮小型スティックバックは,Pitx1のノックアウトマウスのように,左から右の不対称性を示す.
- 遺伝的変化は,Pitx1発現におけるサイト固有の調節的変化を伴うもので,タンパク質コード配列の変異ではない.
結論:
- Pitx1のような重要な発達遺伝子の調節性突然変異は,自然集団における急速な骨格の進化を促進する可能性があります.
- これらの調節の変化は,重要な現象的変化 (骨盤の縮小) を可能にし,他の組織における重要な遺伝子機能を保持します.
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