鳥 の 中 で 周期 的 な 色 が 形成 さ れ て いる の は,ソミット の 起源 の 前型 で ある
Nicolas Haupaix1, Camille Curantz1, Richard Bailleul1
1Center for Interdisciplinary Research in Biology, CNRS 7241, INSERM U1042, Collège de France, Paris, France.
Science (New York, N.Y.)
|September 22, 2018
まとめ
動物の毛皮のパターンは ストライプのような2段階のプロセスで形成されます ソマイトの初期の発達シグナルにより ストライプの位置が確立され ストライプの幅を制御する遺伝子の調節が続き パターン形成の新たな理解が明らかになりました
科学分野:
- 発達生物学
- 進化生物学
- 遺伝学
背景:
- 動物の毛皮のパターン (ストライプ,スポット) は,しばしば自己組織化と考えられ,反応-拡散ダイナミクスから生じる.
- パターンの周期性や方向性における既存の位置情報の役割は不明である.
研究 の 目的:
- 動物の毛皮に周期的なストライプパターンが形成される発達メカニズムを調査する.
- 初期の位置情報が局所動態の上流のストライプパターンの形成に影響を与えるかどうかを判断する.
主な方法:
- 幼い鳥の色帯の自然な変化を利用した.
- 遺伝子発現プロフィールを分析し,特にアグーティ遺伝子の役割に焦点を当てました.
- 自律的なシグナル伝達と用量依存の遺伝子調節を含む2段階のプロセスを調査した.
主要な成果:
- ストライプの位置は,ソミットからの自律的なシグナルによって決定され, アグウティ表現でマークされたプレパターンを作成します.
- Agoutiの遺伝子発現は,ピグメント生成の量依存制御によって,ストライプの幅を調節する.
- 初期の発展の指標が先行し,後の局所的なパターンの動態に影響を与えることを示した.
結論:
- 動物の毛皮のストライプ形成は,初期の位置情報と後の遺伝子調節を含む2段階のプロセスです.
- 初期発達のシグナルが 周期的なパターンを形成し 進化の可能性を制限します
- 毛皮のパターンが自己組織化システムであるという考え方に挑戦し,進化の歴史の役割を強調する.
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